diff --git a/F1:F103/Canon_managing_device/canon.c b/F1:F103/Canon_managing_device/canon.c
index e94eaad..612825e 100644
--- a/F1:F103/Canon_managing_device/canon.c
+++ b/F1:F103/Canon_managing_device/canon.c
@@ -21,6 +21,7 @@
 #include "hardware.h"
 #include "proto.h"
 #include "spi.h"
+#include "strfunc.h"
 #include "usb_dev.h"
 
 #define CU(a)   ((const uint8_t*)a)
@@ -315,7 +316,7 @@ void canon_proc(){
 /*
         case CANON_GETFOCM: // don't work @EF200
             uval = (rbuf[1] << 24) | (rbuf[2] << 16) | (rbuf[3] << 8) | rbuf[4];
-            USB_send("Fval="); USB_send(u2str(uval)); USB_send("\n");
+            USB_sendstr("Fval="); USB_sendstr(u2str(uval)); USB_sendstr("\n");
         break;
         */
 }
@@ -393,7 +394,7 @@ int canon_asku16(uint8_t cmd){
 int canon_getinfo(){
     if(!ready || !canon_read(CANON_GETINFO, 6)) return 1;
     USB_sendstr("Info="); for(int i = 1; i < 7; ++i){
-        USB_sendstr(u2hexstr(buf[i])); USB_sendstr(" ");
+        USB_sendstr(uhex2str(buf[i])); USB_sendstr(" ");
     }
     //canon_poll();
     USB_sendstr("\n");
diff --git a/F1:F103/Canon_managing_device/canon.h b/F1:F103/Canon_managing_device/canon.h
index fb90277..49e17e6 100644
--- a/F1:F103/Canon_managing_device/canon.h
+++ b/F1:F103/Canon_managing_device/canon.h
@@ -18,7 +18,7 @@
 
 #pragma once
 
-#include <stm32f1.h>
+#include <stdint.h>
 
 // all data sent in big-endian format
 
diff --git a/F1:F103/Canon_managing_device/canonmanage.creator.user b/F1:F103/Canon_managing_device/canonmanage.creator.user
index a20b5a3..d96c512 100644
--- a/F1:F103/Canon_managing_device/canonmanage.creator.user
+++ b/F1:F103/Canon_managing_device/canonmanage.creator.user
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE QtCreatorProject>
-<!-- Written by QtCreator 15.0.1, 2025-03-11T16:16:01. -->
+<!-- Written by QtCreator 18.0.0, 2026-03-25T15:00:48. -->
 <qtcreator>
  <data>
   <variable>EnvironmentId</variable>
@@ -13,8 +13,8 @@
  <data>
   <variable>ProjectExplorer.Project.EditorSettings</variable>
   <valuemap type="QVariantMap">
+   <value type="bool" key="EditorConfiguration.AutoDetect">true</value>
    <value type="bool" key="EditorConfiguration.AutoIndent">true</value>
-   <value type="bool" key="EditorConfiguration.AutoSpacesForTabs">false</value>
    <value type="bool" key="EditorConfiguration.CamelCaseNavigation">true</value>
    <valuemap type="QVariantMap" key="EditorConfiguration.CodeStyle.0">
     <value type="QString" key="language">Cpp</value>
@@ -86,12 +86,14 @@
     <valuelist type="QVariantList" key="ClangTools.SuppressedDiagnostics"/>
     <value type="bool" key="ClangTools.UseGlobalSettings">true</value>
    </valuemap>
+   <value type="int" key="RcSync">0</value>
   </valuemap>
  </data>
  <data>
   <variable>ProjectExplorer.Project.Target.0</variable>
   <valuemap type="QVariantMap">
    <value type="QString" key="DeviceType">Desktop</value>
+   <value type="bool" key="HasPerBcDcs">true</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Desktop</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Desktop</value>
    <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">{91347f2c-5221-46a7-80b1-0a054ca02f79}</value>
@@ -109,8 +111,8 @@
       <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericMakeStep</value>
      </valuemap>
      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Сборка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Сборка</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Build</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Build</value>
      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Build</value>
     </valuemap>
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.1">
@@ -122,8 +124,8 @@
       <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericMakeStep</value>
      </valuemap>
      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">1</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Очистка</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Очистка</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Clean</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Clean</value>
      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Clean</value>
     </valuemap>
     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">2</value>
@@ -133,13 +135,46 @@
     <valuelist type="QVariantList" key="ProjectExplorer.BuildConfiguration.UserEnvironmentChanges"/>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">По умолчанию</value>
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">GenericProjectManager.GenericBuildConfiguration</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveDeployConfiguration">0</value>
+    <value type="qlonglong" key="ProjectExplorer.Target.ActiveRunConfiguration">0</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
+     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
+      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">0</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Deploy</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Deploy</value>
+      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Deploy</value>
+     </valuemap>
+     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">1</value>
+     <valuemap type="QVariantMap" key="ProjectExplorer.DeployConfiguration.CustomData"/>
+     <value type="bool" key="ProjectExplorer.DeployConfiguration.CustomDataEnabled">false</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.DefaultDeployConfiguration</value>
+    </valuemap>
+    <value type="qlonglong" key="ProjectExplorer.Target.DeployConfigurationCount">1</value>
+    <valuemap type="QVariantMap" key="ProjectExplorer.Target.RunConfiguration.0">
+     <value type="bool" key="Analyzer.Perf.Settings.UseGlobalSettings">true</value>
+     <value type="bool" key="Analyzer.QmlProfiler.Settings.UseGlobalSettings">true</value>
+     <value type="bool" key="Analyzer.Valgrind.Settings.UseGlobalSettings">true</value>
+     <valuelist type="QVariantList" key="CustomOutputParsers"/>
+     <value type="int" key="PE.EnvironmentAspect.Base">2</value>
+     <valuelist type="QVariantList" key="PE.EnvironmentAspect.Changes"/>
+     <value type="bool" key="PE.EnvironmentAspect.PrintOnRun">false</value>
+     <value type="QString" key="PerfRecordArgsId">-e cpu-cycles --call-graph dwarf,4096 -F 250</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName"></value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
+     <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+     <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
+     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
+     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
+    </valuemap>
+    <value type="qlonglong" key="ProjectExplorer.Target.RunConfigurationCount">1</value>
    </valuemap>
    <value type="qlonglong" key="ProjectExplorer.Target.BuildConfigurationCount">1</value>
    <valuemap type="QVariantMap" key="ProjectExplorer.Target.DeployConfiguration.0">
     <valuemap type="QVariantMap" key="ProjectExplorer.BuildConfiguration.BuildStepList.0">
      <value type="qlonglong" key="ProjectExplorer.BuildStepList.StepsCount">0</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Развёртывание</value>
-     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Развёртывание</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DefaultDisplayName">Deploy</value>
+     <value type="QString" key="ProjectExplorer.ProjectConfiguration.DisplayName">Deploy</value>
      <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.BuildSteps.Deploy</value>
     </valuemap>
     <value type="int" key="ProjectExplorer.BuildConfiguration.BuildStepListCount">1</value>
@@ -161,6 +196,7 @@
     <value type="QString" key="ProjectExplorer.ProjectConfiguration.Id">ProjectExplorer.CustomExecutableRunConfiguration</value>
     <value type="QString" key="ProjectExplorer.RunConfiguration.BuildKey"></value>
     <value type="bool" key="ProjectExplorer.RunConfiguration.Customized">false</value>
+    <value type="QString" key="ProjectExplorer.RunConfiguration.UniqueId"></value>
     <value type="bool" key="RunConfiguration.UseCppDebuggerAuto">true</value>
     <value type="bool" key="RunConfiguration.UseQmlDebuggerAuto">true</value>
    </valuemap>
@@ -171,10 +207,6 @@
   <variable>ProjectExplorer.Project.TargetCount</variable>
   <value type="qlonglong">1</value>
  </data>
- <data>
-  <variable>ProjectExplorer.Project.Updater.FileVersion</variable>
-  <value type="int">22</value>
- </data>
  <data>
   <variable>Version</variable>
   <value type="int">22</value>
diff --git a/F1:F103/Canon_managing_device/canonmanage.files b/F1:F103/Canon_managing_device/canonmanage.files
index 9f67e3f..e687bfb 100644
--- a/F1:F103/Canon_managing_device/canonmanage.files
+++ b/F1:F103/Canon_managing_device/canonmanage.files
@@ -13,6 +13,8 @@ ringbuffer.c
 ringbuffer.h
 spi.c
 spi.h
+strfunc.c
+strfunc.h
 usb.c
 usb.h
 usb_descr.c
diff --git a/F1:F103/Canon_managing_device/canonusb.bin b/F1:F103/Canon_managing_device/canonusb.bin
index 3cc6098..ed12a97 100755
Binary files a/F1:F103/Canon_managing_device/canonusb.bin and b/F1:F103/Canon_managing_device/canonusb.bin differ
diff --git a/F1:F103/Canon_managing_device/flash.c b/F1:F103/Canon_managing_device/flash.c
index 266af23..6ccc499 100644
--- a/F1:F103/Canon_managing_device/flash.c
+++ b/F1:F103/Canon_managing_device/flash.c
@@ -25,6 +25,7 @@
 
 #include "flash.h"
 #include "proto.h"
+#include "strfunc.h"
 #include "usb_dev.h"    // printout
 #include <string.h> // memcpy
 
@@ -145,7 +146,7 @@ static int write2flash(const void *start, const void *wrdata, uint32_t stor_size
         }
 #ifdef EBUG
         USB_sendstr(u2str(stor_size)); USB_sendstr("bytes stored @0x");
-        USB_sendstr(u2hexstr((uint32_t)(address + i))); USB_sendstr("\n");
+        USB_sendstr(uhex2str((uint32_t)(address + i))); USB_sendstr("\n");
 #endif
         FLASH->SR = FLASH_SR_EOP | FLASH_SR_PGERR | FLASH_SR_WRPRTERR;
     }
diff --git a/F1:F103/Canon_managing_device/main.c b/F1:F103/Canon_managing_device/main.c
index f7ff278..7eb1469 100644
--- a/F1:F103/Canon_managing_device/main.c
+++ b/F1:F103/Canon_managing_device/main.c
@@ -49,13 +49,11 @@ int main(void){
     uint32_t SPIctr = Tms;
     while(1){
         IWDG->KR = IWDG_REFRESH;
-        int l = USB_receivestr(inbuff, 255);
-        if(l > 0){
-            parse_cmd(inbuff); // call it even for NULL (if `flood` is running)
-            if(Tms - SPIctr > CANONPROC_INTERVAL){ // not more than once per 10ms
-                SPIctr = Tms;
-                canon_proc();
-            }
+        if(Tms - SPIctr > CANONPROC_INTERVAL){ // not more than once per 10ms
+            SPIctr = Tms;
+            canon_proc();
         }
+        int l = USB_receivestr(inbuff, 255);
+        if(l > 0) parse_cmd(inbuff); // call it even for NULL (if `flood` is running)
     }
 }
diff --git a/F1:F103/Canon_managing_device/proto.c b/F1:F103/Canon_managing_device/proto.c
index 9559481..bf9b9b8 100644
--- a/F1:F103/Canon_managing_device/proto.c
+++ b/F1:F103/Canon_managing_device/proto.c
@@ -23,141 +23,12 @@
 #include "hardware.h"
 #include "proto.h"
 #include "spi.h"
+#include "strfunc.h"
 #include "usb_dev.h"
 #include "version.inc"
 
 static const char *OK = "OK", *FAIL = "FAIL";
 
-char *omit_spaces(const char *buf){
-    while(*buf){
-        if(*buf > ' ') break;
-        ++buf;
-    }
-    return (char*)buf;
-}
-
-// In case of overflow return `buf` and N==0xffffffff
-// read decimal number & return pointer to next non-number symbol
-static char *getdec(const char *buf, uint32_t *N){
-    char *start = (char*)buf;
-    uint32_t num = 0;
-    while(*buf){
-        char c = *buf;
-        if(c < '0' || c > '9'){
-            break;
-        }
-        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
-            *N = 0xffffff;
-            return start;
-        }
-        num *= 10;
-        num += c - '0';
-        ++buf;
-    }
-    *N = num;
-    return (char*)buf;
-}
-// read hexadecimal number (without 0x prefix!)
-static char *gethex(const char *buf, uint32_t *N){
-    char *start = (char*)buf;
-    uint32_t num = 0;
-    while(*buf){
-        char c = *buf;
-        uint8_t M = 0;
-        if(c >= '0' && c <= '9'){
-            M = '0';
-        }else if(c >= 'A' && c <= 'F'){
-            M = 'A' - 10;
-        }else if(c >= 'a' && c <= 'f'){
-            M = 'a' - 10;
-        }
-        if(M){
-            if(num & 0xf0000000){ // overflow
-                *N = 0xffffff;
-                return start;
-            }
-            num <<= 4;
-            num += c - M;
-        }else{
-            break;
-        }
-        ++buf;
-    }
-    *N = num;
-    return (char*)buf;
-}
-// read octal number (without 0 prefix!)
-static char *getoct(const char *buf, uint32_t *N){
-    char *start = (char*)buf;
-    uint32_t num = 0;
-    while(*buf){
-        char c = *buf;
-        if(c < '0' || c > '7'){
-            break;
-        }
-        if(num & 0xe0000000){ // overflow
-            *N = 0xffffff;
-            return start;
-        }
-        num <<= 3;
-        num += c - '0';
-        ++buf;
-    }
-    *N = num;
-    return (char*)buf;
-}
-// read binary number (without b prefix!)
-static char *getbin(const char *buf, uint32_t *N){
-    char *start = (char*)buf;
-    uint32_t num = 0;
-    while(*buf){
-        char c = *buf;
-        if(c < '0' || c > '1'){
-            break;
-        }
-        if(num & 0x80000000){ // overflow
-            *N = 0xffffff;
-            return start;
-        }
-        num <<= 1;
-        if(c == '1') num |= 1;
-        ++buf;
-    }
-    *N = num;
-    return (char*)buf;
-}
-
-/**
- * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
- * @param buf - buffer with number and so on
- * @param N   - the number read
- * @return pointer to first non-number symbol in buf
- *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
- */
-char *getnum(const char *txt, uint32_t *N){
-    char *nxt = NULL;
-    char *s = omit_spaces(txt);
-    if(*s == '0'){ // hex, oct or 0
-        if(s[1] == 'x' || s[1] == 'X'){ // hex
-            nxt = gethex(s+2, N);
-            if(nxt == s+2) nxt = (char*)txt;
-        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
-            nxt = getoct(s+1, N);
-            if(nxt == s+1) nxt = (char*)txt;
-        }else{ // 0
-            nxt = s+1;
-            *N = 0;
-        }
-    }else if(*s == 'b' || *s == 'B'){
-        nxt = getbin(s+1, N);
-        if(nxt == s+1) nxt = (char*)txt;
-    }else{
-        nxt = getdec(s, N);
-        if(nxt == s) nxt = (char*)txt;
-    }
-    return nxt;
-}
-
 const char* helpmsg =
     "https://github.com/eddyem/stm32samples/tree/master/F1-nolib/Canon_managing_device  build#" BUILD_NUMBER " @ " BUILD_DATE "\n"
     "0 - move to smallest foc value (e.g. 2.5m)\n"
@@ -213,7 +84,7 @@ static void sendspibuf(){
         USB_sendstr("Got SPI answer: ");
         for(int i = 0; i < spibuflen; ++i){
             if(i) USB_sendstr(", ");
-            USB_sendstr(u2hexstr(buf[i]));
+            USB_sendstr(uhex2str(buf[i]));
         }
         USB_sendstr("\n");
     }else USB_sendstr("Failed to send SPI buffer\n");
@@ -284,7 +155,7 @@ void parse_cmd(const char *buf){
                 USB_sendstr(OK);
             break;
             case 'F': // just watch SPI->CR1 value
-                USB_sendstr("SPI1->CR1="); USB_sendstr(u2hexstr(SPI_CR1));
+                USB_sendstr("SPI1->CR1="); USB_sendstr(uhex2str(SPI_CR1));
             break;
             case 'G':
                 USB_sendstr("SPI ");
@@ -344,7 +215,7 @@ void parse_cmd(const char *buf){
     }
     uint32_t D = 0;
     int16_t neg;
-    char *nxt;
+    const char *nxt;
     switch(*buf++){ // long messages
         case 'a': // move focus to absolute position
             buf = omit_spaces(buf);
@@ -425,7 +296,7 @@ void parse_cmd(const char *buf){
                     USB_sendstr(helpmsg);
                     return;
             }
-            USB_sendstr("SPI_CR1="); USB_sendstr(u2hexstr(SPI_CR1));
+            USB_sendstr("SPI_CR1="); USB_sendstr(uhex2str(SPI_CR1));
         break;
         case 'L':
             if(0 == initspibuf(buf)){
@@ -445,7 +316,7 @@ void parse_cmd(const char *buf){
             USB_sendstr("Send: ");
             for(int i = 0; i < spibuflen; ++i){
                 if(i) USB_sendstr(", ");
-                USB_sendstr(u2hexstr(spibuf[i]));
+                USB_sendstr(uhex2str(spibuf[i]));
             }
             USB_sendstr("\n");
             sendspibuf();
@@ -456,41 +327,3 @@ void parse_cmd(const char *buf){
     }
     newline();
 }
-
-
-// return string with number `val`
-char *u2str(uint32_t val){
-    static char strbuf[11];
-    char *bufptr = &strbuf[10];
-    *bufptr = 0;
-    if(!val){
-        *(--bufptr) = '0';
-    }else{
-        while(val){
-            *(--bufptr) = val % 10 + '0';
-            val /= 10;
-        }
-    }
-    return bufptr;
-}
-
-char *u2hexstr(uint32_t val){
-    static char strbuf[11] = "0x";
-    char *sptr = strbuf + 2;
-    uint8_t *ptr = (uint8_t*)&val + 3;
-    int8_t i, j, z=1;
-    for(i = 0; i < 4; ++i, --ptr){
-        if(*ptr == 0){ // omit leading zeros
-            if(i == 3) z = 0;
-            if(z) continue;
-        }
-        else z = 0;
-        for(j = 1; j > -1; --j){
-            uint8_t half = (*ptr >> (4*j)) & 0x0f;
-            if(half < 10) *sptr++ = half + '0';
-            else *sptr++ = half - 10 + 'a';
-        }
-    }
-    *sptr = 0;
-    return strbuf;
-}
diff --git a/F1:F103/Canon_managing_device/proto.h b/F1:F103/Canon_managing_device/proto.h
index efd66f0..ffde9fd 100644
--- a/F1:F103/Canon_managing_device/proto.h
+++ b/F1:F103/Canon_managing_device/proto.h
@@ -17,24 +17,15 @@
  */
 
 #pragma once
-#ifndef PROTO_H__
-#define PROTO_H__
 
-#include <stm32f1.h>
 
 #define printu(x)       do{USB_sendstr(u2str(x));}while(0)
 #define printuhex(x)    do{USB_sendstr(uhex2str(x));}while(0)
 
 #ifdef EBUG
-#define DBG(x)      do{USB_send(x); USB_send("\n");}while(0)
+#define DBG(x)      do{USB_sendstr(x); newline();}while(0)
 #else
 #define DBG(x)
 #endif
 
 void parse_cmd(const char *buf);
-char *omit_spaces(const char *buf);
-char *getnum(const char *buf, uint32_t *N);
-char *u2str(uint32_t val);
-char *u2hexstr(uint32_t val);
-
-#endif // PROTO_H__
diff --git a/F1:F103/Canon_managing_device/ringbuffer.c b/F1:F103/Canon_managing_device/ringbuffer.c
index b0ffe8e..0a84269 100644
--- a/F1:F103/Canon_managing_device/ringbuffer.c
+++ b/F1:F103/Canon_managing_device/ringbuffer.c
@@ -15,6 +15,8 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <string.h>
+#include <stm32f1.h>
 #include "ringbuffer.h"
 
 static int datalen(ringbuffer *b){
@@ -24,7 +26,7 @@ static int datalen(ringbuffer *b){
 
 // stored data length
 int RB_datalen(ringbuffer *b){
-    if(b->busy) return -1;
+    if(!b || b->busy) return -1;
     b->busy = 1;
     int l = datalen(b);
     b->busy = 0;
@@ -32,7 +34,7 @@ int RB_datalen(ringbuffer *b){
 }
 
 static int hasbyte(ringbuffer *b, uint8_t byte){
-    if(b->head == b->tail) return -1; // no data in buffer
+    if(!b || b->head == b->tail) return -1; // no data in buffer
     int startidx = b->head;
     if(b->head > b->tail){ //
         for(int found = b->head; found < b->length; ++found)
@@ -51,18 +53,13 @@ static int hasbyte(ringbuffer *b, uint8_t byte){
  * @return index if found, -1 if none or busy
  */
 int RB_hasbyte(ringbuffer *b, uint8_t byte){
-    if(b->busy) return -1;
+    if(!b || b->busy) return -1;
     b->busy = 1;
     int ret = hasbyte(b, byte);
     b->busy = 0;
     return ret;
 }
 
-// poor memcpy
-static void mcpy(uint8_t *targ, const uint8_t *src, int l){
-    while(l--) *targ++ = *src++;
-}
-
 // increment head or tail
 TRUE_INLINE void incr(ringbuffer *b, volatile int *what, int n){
     *what += n;
@@ -76,9 +73,9 @@ static int read(ringbuffer *b, uint8_t *s, int len){
     int _1st = b->length - b->head;
     if(_1st > l) _1st = l;
     if(_1st > len) _1st = len;
-    mcpy(s, b->data + b->head, _1st);
+    memcpy(s, b->data + b->head, _1st);
     if(_1st < len && l > _1st){
-        mcpy(s+_1st, b->data, l - _1st);
+        memcpy(s+_1st, b->data, l - _1st);
         incr(b, &b->head, l);
         return l;
     }
@@ -94,20 +91,27 @@ static int read(ringbuffer *b, uint8_t *s, int len){
  * @return bytes read or -1 if busy
  */
 int RB_read(ringbuffer *b, uint8_t *s, int len){
-    if(b->busy) return -1;
+    if(!b || b->busy || !s || len < 1) return -1;
     b->busy = 1;
     int r = read(b, s, len);
     b->busy = 0;
     return r;
 }
 
-static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
+// length of data from current position to `byte` (including byte)
+static int lento(ringbuffer *b, uint8_t byte){
     int idx = hasbyte(b, byte);
     if(idx < 0) return 0;
     int partlen = idx + 1 - b->head;
     // now calculate length of new data portion
     if(idx < b->head) partlen += b->length;
-    if(partlen > len) return -read(b, s, len);
+    return partlen;
+}
+
+static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
+    int partlen = lento(b, byte);
+    if(!partlen) return 0;
+    if(partlen > len) return -1;
     return read(b, s, partlen);
 }
 
@@ -115,26 +119,41 @@ static int readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
  * @brief RB_readto fill array `s` with data until byte `byte` (with it)
  * @param b - ringbuffer
  * @param byte - check byte
- * @param s - buffer to write data
- * @param len - length of `s`
+ * @param s - buffer to write data or NULL to clear data
+ * @param len - length of `s` or 0 to clear data
  * @return amount of bytes written (negative, if len<data in buffer or buffer is busy)
  */
 int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len){
-    if(b->busy) return -1;
+    if(!b || b->busy) return -1;
     b->busy = 1;
-    int n = readto(b, byte, s, len);
+    int n = 0;
+    if(s && len > 0){
+        n = readto(b, byte, s, len);
+    }else{
+        incr(b, &b->head, lento(b, byte)); // just throw data out
+    }
     b->busy = 0;
     return n;
 }
 
+int RB_datalento(ringbuffer *b, uint8_t byte){
+    if(!b || b->busy) return -1;
+    b->busy = 1;
+    int n = lento(b, byte);
+    b->busy = 0;
+    return n;
+}
+
+// if l < rest of buffer, truncate and return actually written bytes
 static int write(ringbuffer *b, const uint8_t *str, int l){
     int r = b->length - 1 - datalen(b); // rest length
-    if(l > r || !l) return 0;
+    if(r < 1) return 0;
+    if(l > r) l = r;
     int _1st = b->length - b->tail;
     if(_1st > l) _1st = l;
-    mcpy(b->data + b->tail, str, _1st);
+    memcpy(b->data + b->tail, str, _1st);
     if(_1st < l){ // add another piece from start
-        mcpy(b->data, str+_1st, l-_1st);
+        memcpy(b->data, str+_1st, l-_1st);
     }
     incr(b, &b->tail, l);
     return l;
@@ -148,7 +167,7 @@ static int write(ringbuffer *b, const uint8_t *str, int l){
  * @return amount of bytes written or -1 if busy
  */
 int RB_write(ringbuffer *b, const uint8_t *str, int l){
-    if(b->busy) return -1;
+    if(!b || b->busy || !str || l < 1) return -1;
     b->busy = 1;
     int w = write(b, str, l);
     b->busy = 0;
@@ -157,7 +176,7 @@ int RB_write(ringbuffer *b, const uint8_t *str, int l){
 
 // just delete all information in buffer `b`
 int RB_clearbuf(ringbuffer *b){
-    if(b->busy) return -1;
+    if(!b || b->busy) return -1;
     b->busy = 1;
     b->head = 0;
     b->tail = 0;
diff --git a/F1:F103/Canon_managing_device/ringbuffer.h b/F1:F103/Canon_managing_device/ringbuffer.h
index ed2cf95..f9e1e64 100644
--- a/F1:F103/Canon_managing_device/ringbuffer.h
+++ b/F1:F103/Canon_managing_device/ringbuffer.h
@@ -17,13 +17,7 @@
 
 #pragma once
 
-#if defined STM32F0
-#include <stm32f0.h>
-#elif defined STM32F1
-#include <stm32f1.h>
-#elif defined STM32F3
-#include <stm32f3.h>
-#endif
+#include <stdint.h>
 
 typedef struct{
     uint8_t *data;      // data buffer
@@ -38,4 +32,5 @@ int RB_readto(ringbuffer *b, uint8_t byte, uint8_t *s, int len);
 int RB_hasbyte(ringbuffer *b, uint8_t byte);
 int RB_write(ringbuffer *b, const uint8_t *str, int l);
 int RB_datalen(ringbuffer *b);
+int RB_datalento(ringbuffer *b, uint8_t byte);
 int RB_clearbuf(ringbuffer *b);
diff --git a/F1:F103/Canon_managing_device/spi.c b/F1:F103/Canon_managing_device/spi.c
index c6a8ef5..6b08806 100644
--- a/F1:F103/Canon_managing_device/spi.c
+++ b/F1:F103/Canon_managing_device/spi.c
@@ -21,9 +21,10 @@
 #include "spi.h"
 #include "hardware.h"
 #ifdef EBUG
-#include "usb.h"
+#include "usb_dev.h"
 #endif
 #include "proto.h"
+#include "strfunc.h"
 
 /*
 static void mymemcpy(uint8_t *dest, uint8_t *src, int len){
@@ -56,26 +57,26 @@ uint8_t SPI_transmit(uint8_t *buf, uint8_t len){
     if(!buf || !len) return 0; // bad data format
     if(SPI_status != SPI_READY) return 0; // spi not ready to transmit data
 #ifdef EBUG
-    USB_send("SPI send "); USB_send(u2str(len));
-    USB_send("bytes, data: ");
+    USB_sendstr("SPI send "); USB_sendstr(u2str(len));
+    USB_sendstr("bytes, data: ");
 #endif
     for(uint8_t x = 0; x < len; ++x){
         WAITX(!(SPI1->SR & SPI_SR_TXE));
         SPI1->DR = buf[x];
         WAITX(!(SPI1->SR & SPI_SR_BSY));
 #ifdef EBUG
-        USB_send(u2hexstr(buf[x])); USB_send(", ");
+        USB_sendstr(uhex2str(buf[x])); USB_sendstr(", ");
 #endif
         WAITX(!(SPI1->SR & SPI_SR_RXNE));
         buf[x] = SPI1->DR;
         for(int ctr = 0; ctr < 3600; ++ctr) IWDG->KR = IWDG_REFRESH; // ~100mks delay
     }
 #ifdef EBUG
-    USB_send("\nReceive: ");
+    USB_sendstr("\nReceive: ");
     for(int i = 0; i < len; ++i){
-        USB_send(u2hexstr(buf[i])); USB_send(", ");
+        USB_sendstr(uhex2str(buf[i])); USB_sendstr(", ");
     }
-    USB_send("\n");
+    USB_sendstr("\n");
 #endif
     return len;
 }
diff --git a/F1:F103/Canon_managing_device/strfunc.c b/F1:F103/Canon_managing_device/strfunc.c
new file mode 100644
index 0000000..b15b552
--- /dev/null
+++ b/F1:F103/Canon_managing_device/strfunc.c
@@ -0,0 +1,265 @@
+/*
+ * This file is part of the test project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "strfunc.h"
+
+/**
+ * @brief hexdump - dump hex array by 16 bytes in string
+ * @param sendfun - function to send data
+ * @param arr - array to dump
+ * @param len - length of `arr`
+ */
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len){
+    char buf[52], *bptr = buf;
+    for(uint16_t l = 0; l < len; ++l, ++arr){
+        for(int16_t j = 1; j > -1; --j){
+            register uint8_t half = (*arr >> (4*j)) & 0x0f;
+            if(half < 10) *bptr++ = half + '0';
+            else *bptr++ = half - 10 + 'a';
+        }
+        if(l % 16 == 15){
+            *bptr++ = '\n';
+            *bptr = 0;
+            sendfun(buf);
+            bptr = buf;
+        }else *bptr++ = ' ';
+    }
+    if(bptr != buf){
+        *bptr++ = '\n';
+        *bptr = 0;
+        sendfun(buf);
+    }
+}
+
+/**
+ * @brief _2str - convert value into string buffer
+ * @param val - |value|
+ * @param minus - ==0 if value > 0
+ * @return buffer with number
+ */
+static const char *_2str(uint32_t  val, uint8_t minus){
+    static char strbuf[12];
+    char *bufptr = &strbuf[11];
+    *bufptr = 0;
+    if(!val){
+        *(--bufptr) = '0';
+    }else{
+        while(val){
+            uint32_t x = val / 10;
+            *(--bufptr) = (val - 10*x) + '0';
+            val = x;
+        }
+    }
+    if(minus) *(--bufptr) = '-';
+    return bufptr;
+}
+
+// return string with number `val`
+const char *u2str(uint32_t val){
+    return _2str(val, 0);
+}
+const char *i2str(int32_t i){
+    uint8_t minus = 0;
+    uint32_t val;
+    if(i < 0){
+        minus = 1;
+        val = -i;
+    }else val = i;
+    return _2str(val, minus);
+}
+
+/**
+ * @brief uhex2str - print 32bit unsigned int as hex
+ * @param val - value
+ * @return string with number
+ */
+const char *uhex2str(uint32_t val){
+    static char buf[12] = "0x";
+    int npos = 2;
+    uint8_t *ptr = (uint8_t*)&val + 3;
+    int8_t i, j, z=1;
+    for(i = 0; i < 4; ++i, --ptr){
+        if(*ptr == 0){ // omit leading zeros
+            if(i == 3) z = 0;
+            if(z) continue;
+        }
+        else z = 0;
+        for(j = 1; j > -1; --j){
+            uint8_t half = (*ptr >> (4*j)) & 0x0f;
+            if(half < 10) buf[npos++] = half + '0';
+            else buf[npos++] = half - 10 + 'a';
+        }
+    }
+    buf[npos] = 0;
+    return buf;
+}
+
+/**
+ * @brief omit_spaces - eliminate leading spaces and other trash in string
+ * @param buf - string
+ * @return - pointer to first character in `buf` > ' '
+ */
+const char *omit_spaces(const char *buf){
+    while(*buf){
+        if(*buf > ' ') break;
+        ++buf;
+    }
+    return buf;
+}
+
+/**
+ * @brief getdec - read decimal number & return pointer to next non-number symbol
+ * @param buf - string
+ * @param N - number read
+ * @return Next non-number symbol. In case of overflow return `buf` and N==0xffffffff
+ */
+static const char *getdec(const char *buf, uint32_t *N){
+    char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '9'){
+            break;
+        }
+        if(num > 429496729 || (num == 429496729 && c > '5')){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num *= 10;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read hexadecimal number (without 0x prefix!)
+static const char *gethex(const char *buf, uint32_t *N){
+    const char *start = buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        uint8_t M = 0;
+        if(c >= '0' && c <= '9'){
+            M = '0';
+        }else if(c >= 'A' && c <= 'F'){
+            M = 'A' - 10;
+        }else if(c >= 'a' && c <= 'f'){
+            M = 'a' - 10;
+        }
+        if(M){
+            if(num & 0xf0000000){ // overflow
+                *N = 0xffffff;
+                return start;
+            }
+            num <<= 4;
+            num += c - M;
+        }else{
+            break;
+        }
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read octal number (without 0 prefix!)
+static const char *getoct(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '7'){
+            break;
+        }
+        if(num & 0xe0000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 3;
+        num += c - '0';
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+// read binary number (without b prefix!)
+static const char *getbin(const char *buf, uint32_t *N){
+    const char *start = (char*)buf;
+    uint32_t num = 0;
+    while(*buf){
+        char c = *buf;
+        if(c < '0' || c > '1'){
+            break;
+        }
+        if(num & 0x80000000){ // overflow
+            *N = 0xffffff;
+            return start;
+        }
+        num <<= 1;
+        if(c == '1') num |= 1;
+        ++buf;
+    }
+    *N = num;
+    return buf;
+}
+
+/**
+ * @brief getnum - read uint32_t from string (dec, hex or bin: 127, 0x7f, 0b1111111)
+ * @param buf - buffer with number and so on
+ * @param N   - the number read
+ * @return pointer to first non-number symbol in buf
+ *      (if it is == buf, there's no number or if *N==0xffffffff there was overflow)
+ */
+const char *getnum(const char *txt, uint32_t *N){
+    const char *nxt = NULL;
+    const char *s = omit_spaces(txt);
+    if(*s == '0'){ // hex, oct or 0
+        if(s[1] == 'x' || s[1] == 'X'){ // hex
+            nxt = gethex(s+2, N);
+            if(nxt == s+2) nxt = (char*)txt;
+        }else if(s[1] > '0'-1 && s[1] < '8'){ // oct
+            nxt = getoct(s+1, N);
+            if(nxt == s+1) nxt = (char*)txt;
+        }else{ // 0
+            nxt = s+1;
+            *N = 0;
+        }
+    }else if(*s == 'b' || *s == 'B'){
+        nxt = getbin(s+1, N);
+        if(nxt == s+1) nxt = (char*)txt;
+    }else{
+        nxt = getdec(s, N);
+        if(nxt == s) nxt = (char*)txt;
+    }
+    return nxt;
+}
+
+// get signed integer
+const char *getint(const char *txt, int32_t *I){
+    const char *s = omit_spaces(txt);
+    int32_t sign = 1;
+    uint32_t U;
+    if(*s == '-'){
+        sign = -1;
+        ++s;
+    }
+    const char *nxt = getnum(s, &U);
+    if(nxt == s) return txt;
+    if(U & 0x80000000) return txt; // overfull
+    *I = sign * (int32_t)U;
+    return nxt;
+}
diff --git a/F1:F103/Canon_managing_device/strfunc.h b/F1:F103/Canon_managing_device/strfunc.h
new file mode 100644
index 0000000..58f5d31
--- /dev/null
+++ b/F1:F103/Canon_managing_device/strfunc.h
@@ -0,0 +1,30 @@
+/*
+ * This file is part of the test project.
+ * Copyright 2026 Edward V. Emelianov <edward.emelianoff@gmail.com>.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <string.h>
+
+void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
+const char *u2str(uint32_t val);
+const char *i2str(int32_t i);
+const char *uhex2str(uint32_t val);
+const char *getnum(const char *txt, uint32_t *N);
+const char *omit_spaces(const char *buf);
+const char *getint(const char *txt, int32_t *I);
diff --git a/F1:F103/Canon_managing_device/usb_descr.c b/F1:F103/Canon_managing_device/usb_descr.c
index 850dde1..169a3df 100644
--- a/F1:F103/Canon_managing_device/usb_descr.c
+++ b/F1:F103/Canon_managing_device/usb_descr.c
@@ -26,7 +26,7 @@ static const uint8_t USB_DeviceDescriptor[] = {
     USB_DT_DEVICE, // bDescriptorType
     L16(bcdUSB), // bcdUSB_L
     H16(bcdUSB), // bcdUSB_H
-    USB_CLASS_COMM, // bDeviceClass
+    USB_CLASS_MISC, // bDeviceClass
     bDeviceSubClass, // bDeviceSubClass
     bDeviceProtocol, // bDeviceProtocol
     USB_EP0BUFSZ, // bMaxPacketSize
@@ -140,7 +140,7 @@ static const uint8_t USB_ConfigDescriptor[] = {
 //const uint8_t HID_ReportDescriptor[];
 
 _USB_LANG_ID_(LD, LANG_US);
-_USB_STRING_(SD, u"0.1.0");
+_USB_STRING_(SD, u"0.1.1");
 _USB_STRING_(MD, u"eddy@sao.ru");
 _USB_STRING_(PD, u"USB/CAN Canon lens controller");
 _USB_STRING_(ID, u"canonlens");
diff --git a/F1:F103/Canon_managing_device/usb_dev.c b/F1:F103/Canon_managing_device/usb_dev.c
index f6af768..177c882 100644
--- a/F1:F103/Canon_managing_device/usb_dev.c
+++ b/F1:F103/Canon_managing_device/usb_dev.c
@@ -15,7 +15,6 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <stm32f1.h>
 #include <string.h>
 
 #include "ringbuffer.h"
@@ -41,10 +40,10 @@
 static volatile uint8_t bufovrfl = 0;
 
 // receive buffer: hold data until chkin() call
-static uint8_t volatile rcvbuf[USB_RXBUFSZ];
+static uint8_t volatile rcvbuf[USB_RXBUFSZ] __attribute__((aligned(4)));
 static uint8_t volatile rcvbuflen = 0;
 // line coding
-usb_LineCoding WEAK lineCoding = {115200, 0, 0, 8};
+usb_LineCoding lineCoding = {115200, 0, 0, 8};
 // CDC configured and ready to use
 volatile uint8_t CDCready = 0;
 
@@ -70,10 +69,10 @@ static void chkin(){
 
 // called from transmit EP to send next data portion or by user - when new transmission starts
 static void send_next(){
-    uint8_t usbbuff[USB_TXBUFSZ];
+    uint8_t usbbuff[USB_TXBUFSZ] __attribute__((aligned(4)));
     int buflen = RB_read((ringbuffer*)&rbout, (uint8_t*)usbbuff, USB_TXBUFSZ);
     if(buflen == 0){
-        if(lastdsz == 64) EP_Write(1, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
+        if(lastdsz == USB_TXBUFSZ) EP_Write(1, NULL, 0); // send ZLP after USB_TXBUFSZ bits packet when nothing more to send
         lastdsz = 0;
         return;
     }else if(buflen < 0){
@@ -103,21 +102,20 @@ static void rxtx_handler(){
 
 // weak handlers: change them somewhere else if you want to setup USART
 // SET_LINE_CODING
-void WEAK linecoding_handler(usb_LineCoding *lc){
+void linecoding_handler(usb_LineCoding *lc){
     lineCoding = *lc;
 }
 
 // SET_CONTROL_LINE_STATE
-void WEAK clstate_handler(uint16_t val){
+void clstate_handler(uint16_t val){
     CDCready = val; // CONTROL_DTR | CONTROL_RTS -> interface connected; 0 -> disconnected
 }
 
 // SEND_BREAK
-void WEAK break_handler(){
+void break_handler(){
     CDCready = 0;
 }
 
-
 // USB is configured: setup endpoints
 void set_configuration(){
     EP_Init(1, EP_TYPE_BULK, USB_TXBUFSZ, USB_RXBUFSZ, rxtx_handler); // IN1 and OUT1
@@ -166,7 +164,16 @@ int USB_sendall(){
 int USB_send(const uint8_t *buf, int len){
     if(!buf || !CDCready || !len) return FALSE;
     while(len){
-        int a = RB_write((ringbuffer*)&rbout, buf, len);
+        IWDG->KR = IWDG_REFRESH;
+        int l = RB_datalen((ringbuffer*)&rbout);
+        if(l < 0) continue;
+        int portion = rbout.length - 1 - l;
+        if(portion < 1){
+            if(lastdsz == 0) send_next();
+            continue;
+        }
+        if(portion > len) portion = len;
+        int a = RB_write((ringbuffer*)&rbout, buf, portion);
         if(a > 0){
             len -= a;
             buf += a;
@@ -217,7 +224,7 @@ int USB_receive(uint8_t *buf, int len){
  * @brief USB_receivestr - get string up to '\n' and replace '\n' with 0
  * @param buf - receiving buffer
  * @param len - its length
- * @return strlen or negative value indicating overflow (if so, string won't be ends with 0 and buffer should be cleared)
+ * @return strlen or negative value indicating overflow
  */
 int USB_receivestr(char *buf, int len){
     chkin();
@@ -226,14 +233,18 @@ int USB_receivestr(char *buf, int len){
         bufovrfl = 0;
         return -1;
     }
-    int l = RB_readto((ringbuffer*)&rbin, '\n', (uint8_t*)buf, len);
-    if(l < 1){
+    int l = RB_datalento((ringbuffer*)&rbin, '\n');
+    if(l > len){ // can't read: line too long -> clear it
+        RB_readto((ringbuffer*)&rbin, '\n', NULL, 0);
+        return -1;
+    }else if(l < 1){ // nothing or no '\n' ?
         if(rbin.length == RB_datalen((ringbuffer*)&rbin)){ // buffer is full but no '\n' found
             while(1 != RB_clearbuf((ringbuffer*)&rbin));
             return -1;
         }
         return 0;
     }
+    l = RB_readto((ringbuffer*)&rbin, '\n', (uint8_t*)buf, len);
     if(l == 0) return 0;
     buf[l-1] = 0; // replace '\n' with strend
     return l;
diff --git a/F1:F103/Canon_managing_device/usb_dev.h b/F1:F103/Canon_managing_device/usb_dev.h
index ea2263e..70ee1bc 100644
--- a/F1:F103/Canon_managing_device/usb_dev.h
+++ b/F1:F103/Canon_managing_device/usb_dev.h
@@ -16,7 +16,7 @@
  */
 #pragma once
 
-#include <stm32f1.h>
+#include <stdint.h>
 #include "usb_lib.h"
 
 typedef struct {
diff --git a/F1:F103/Canon_managing_device/usb_lib.c b/F1:F103/Canon_managing_device/usb_lib.c
index 6c16545..3e7189e 100644
--- a/F1:F103/Canon_managing_device/usb_lib.c
+++ b/F1:F103/Canon_managing_device/usb_lib.c
@@ -23,7 +23,7 @@
 static ep_t endpoints[STM32ENDPOINTS];
 
 static uint16_t USB_Addr = 0;
-static uint8_t setupdatabuf[EP0DATABUF_SIZE];
+static uint8_t setupdatabuf[EP0DATABUF_SIZE] __attribute__((aligned(4)));
 static config_pack_t *setup_packet = (config_pack_t*) setupdatabuf;
 volatile uint8_t usbON = 0; // device is configured and active
 
@@ -81,8 +81,7 @@ void WEAK usb_standard_request(){
         break;
         case REQ_RECIPIENT_ENDPOINT:
             if(setup_packet->bRequest == CLEAR_FEATURE){
-            }else{
-            }
+            }else{ /* wrong */ }
         break;
         default:
         break;
@@ -97,7 +96,7 @@ void WEAK usb_class_request(config_pack_t *req, uint8_t _U_ *data, uint16_t _U_
         case SET_CONFIGURATION: // set featuring by req->wValue
         break;
         default:
-        break;
+            break;
     }
     if(0 == (setup_packet->bmRequestType & 0x80)) // host2dev
         EP_WriteIRQ(0, NULL, 0);
@@ -119,7 +118,7 @@ bmRequestType: 76543210
  */
 static void EP0_Handler(){
     uint8_t ep0dbuflen = 0;
-    uint8_t ep0databuf[EP0DATABUF_SIZE];
+    uint8_t ep0databuf[EP0DATABUF_SIZE] __attribute__((aligned(4)));
     uint16_t epstatus = KEEP_DTOG(USB->EPnR[0]); // EP0R on input -> return this value after modifications
     int rxflag = RX_FLAG(epstatus);
     // check direction
@@ -128,6 +127,7 @@ static void EP0_Handler(){
                 EP_Read(0, setupdatabuf);
                 // interrupt handler will be called later
             }else if(epstatus & USB_EPnR_CTR_RX){ // data packet -> push received data to ep0databuf
+                //if(endpoints[0].rx_cnt){ }
                 ep0dbuflen = EP_Read(0, ep0databuf);
             }
     }
@@ -137,8 +137,7 @@ static void EP0_Handler(){
             case REQ_TYPE_STANDARD:
                 if(SETUP_FLAG(epstatus)){
                     usb_standard_request();
-                }else{
-                }
+                }else{ }
                 break;
             case REQ_TYPE_CLASS:
                 usb_class_request(setup_packet, ep0databuf, ep0dbuflen);
@@ -173,9 +172,14 @@ static void EP0_Handler(){
  */
 void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
     if(size > endpoints[number].txbufsz) size = endpoints[number].txbufsz;
+#ifndef USB32
     uint16_t N2 = (size + 1) >> 1;
     // the buffer is 16-bit, so we should copy data as it would be uint16_t
     uint16_t *buf16 = (uint16_t *)buf;
+#else
+    int N4 = (size + 3) >> 2;
+    uint32_t *buf32 = (uint32_t *)buf;
+#endif
 #if defined USB1_16
     // very bad: what if `size` is odd?
     uint32_t *out = (uint32_t *)endpoints[number].tx_buf;
@@ -184,13 +188,19 @@ void EP_WriteIRQ(uint8_t number, const uint8_t *buf, uint16_t size){
     }
 #elif defined USB2_16
     // use memcpy instead?
-    for(int i = 0; i < N2; i++){
+    for(int i = 0; i < N2; ++i){
         endpoints[number].tx_buf[i] = buf16[i];
     }
+#elif defined USB32
+    for(int i = 0; i < N4; ++i) endpoints[number].tx_buf[i] = buf32[i];
 #else
-#error "Define USB1_16 or USB2_16"
+#error "Define USB1_16 / USB2_16 / USB32"
 #endif
+#ifndef USB32
     USB_BTABLE->EP[number].USB_COUNT_TX = size;
+#else
+    USB_BTABLE->EP[number].USB_ADDR_COUNT_TX = (USB_BTABLE->EP[number].USB_ADDR_COUNT_TX & 0xffff) | (size << 16);
+#endif
 }
 
 /**
@@ -225,8 +235,12 @@ int EP_Read(uint8_t number, uint8_t *buf){
     // use memcpy instead?
     for(int i = 0; i < sz; ++i)
         buf[i] = endpoints[number].rx_buf[i];
+#elif defined USB32
+    uint32_t *u32buf = (uint32_t*) buf;
+    int N4 = (sz + 3) >> 2;
+    for(int i = 0; i < N4; ++i) u32buf[i] = endpoints[number].rx_buf[i];
 #else
-#error "Define USB1_16 or USB2_16"
+#error "Define USB1_16 / USB2_16 / USB32"
 #endif
     return sz;
 }
@@ -243,11 +257,16 @@ static uint16_t lastaddr = LASTADDR_DEFAULT;
  * @return 0 if all OK
  */
 int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)(ep_t ep)){
+#ifdef STM32G0
+    // in STM32G0 all buffers should be aligned by 32 bits
+    if(txsz & 3) txsz = ((txsz >> 2)+1) << 2;
+    if(rxsz & 3) rxsz = ((rxsz >> 2)+1) << 2;
+#endif
     if(number >= STM32ENDPOINTS) return 4; // out of configured amount
     if(txsz > USB_BTABLE_SIZE/ACCESSZ || rxsz > USB_BTABLE_SIZE/ACCESSZ) return 1; // buffer too large
     if(lastaddr + txsz + rxsz >= USB_BTABLE_SIZE/ACCESSZ) return 2; // out of btable
     USB->EPnR[number] = (type << 9) | (number & USB_EPnR_EA);
-    USB->EPnR[number] ^= USB_EPnR_STAT_RX | USB_EPnR_STAT_TX_1;
+    USB->EPnR[number] ^= USB_EPnR_STAT_RX | USB_EPnR_STAT_TX;
     if(rxsz & 1) return 3; // wrong rx buffer size
     uint16_t countrx = 0;
     if(rxsz < 64) countrx = rxsz / 2;
@@ -255,15 +274,28 @@ int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*f
         if(rxsz & 0x1f) return 3; // should be multiple of 32
         countrx = 31 + rxsz / 32;
     }
-    USB_BTABLE->EP[number].USB_ADDR_TX = lastaddr;
+#ifdef USB32
+    endpoints[number].tx_buf = (uint32_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
+#else
     endpoints[number].tx_buf = (uint16_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
+#endif
     endpoints[number].txbufsz = txsz;
-    lastaddr += txsz;
+#ifdef USB32
+    USB_BTABLE->EP[number].USB_ADDR_COUNT_TX = (uint32_t) lastaddr;
+#else
+    USB_BTABLE->EP[number].USB_ADDR_TX = lastaddr;
     USB_BTABLE->EP[number].USB_COUNT_TX = 0;
-    USB_BTABLE->EP[number].USB_ADDR_RX = lastaddr;
+#endif
+    lastaddr += txsz;
+#ifdef USB32
+    endpoints[number].rx_buf = (uint32_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
+    USB_BTABLE->EP[number].USB_ADDR_COUNT_RX = (uint32_t) lastaddr | countrx << 26;
+#else
     endpoints[number].rx_buf = (uint8_t *)(USB_BTABLE_BASE + lastaddr * ACCESSZ);
-    lastaddr += rxsz;
+    USB_BTABLE->EP[number].USB_ADDR_RX = lastaddr;
     USB_BTABLE->EP[number].USB_COUNT_RX = countrx << 10;
+#endif
+    lastaddr += rxsz;
     endpoints[number].func = func;
     return 0;
 }
@@ -272,7 +304,8 @@ int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*f
 void USB_IRQ(){
     uint32_t CNTR = USB->CNTR;
     USB->CNTR = 0;
-    if(USB->ISTR & USB_ISTR_RESET){
+    uint32_t istr = USB->ISTR;
+    if(istr & USB_ISTR_RESET){
         usbON = 0;
         // Reinit registers
         CNTR = USB_CNTR_RESETM | USB_CNTR_CTRM | USB_CNTR_SUSPM;
@@ -281,42 +314,56 @@ void USB_IRQ(){
         lastaddr = LASTADDR_DEFAULT;
         // clear address, leave only enable bit
         USB->DADDR = USB_DADDR_EF;
-        USB->ISTR = ~USB_ISTR_RESET;
+        //USB->ISTR = ~(USB_ISTR_RESET); // clear all flags
         if(EP_Init(0, EP_TYPE_CONTROL, USB_EP0BUFSZ, USB_EP0BUFSZ, EP0_Handler)){
             return;
         };
     }
-    if(USB->ISTR & USB_ISTR_CTR){
+    if(istr & USB_ISTR_CTR){
         // EP number
-        uint8_t n = USB->ISTR & USB_ISTR_EPID;
+        uint8_t n = istr & USB_ISTR_EPID;
+        if (istr & USB_ISTR_DIR){ // OUT
+        }else{ // IN
+        }
         // copy received bytes amount
-        endpoints[n].rx_cnt = USB_BTABLE->EP[n].USB_COUNT_RX & 0x3FF; // low 10 bits is counter
+        endpoints[n].rx_cnt =
+#ifdef USB32
+            (USB_BTABLE->EP[n].USB_ADDR_COUNT_RX >> 16) & 0x3FF;
+#else
+        USB_BTABLE->EP[n].USB_COUNT_RX & 0x3FF; // low 10 bits is counter
+#endif
         // call EP handler
         if(endpoints[n].func) endpoints[n].func();
     }
-    if(USB->ISTR & USB_ISTR_WKUP){ // wakeup
-#ifndef STM32F0
-        CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM); // clear suspend flags
-#else
+    if(istr & USB_ISTR_WKUP){ // wakeup
+#if defined STM32F0
         CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LPMODE | USB_CNTR_WKUPM);
-#endif
-        USB->ISTR = ~USB_ISTR_WKUP;
-    }
-    if(USB->ISTR & USB_ISTR_SUSP){ // suspend -> still no connection, may sleep
-        usbON = 0;
-#ifndef STM32F0
-        CNTR |= USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM;
+#elif defined STM32G0
+        CNTR &= ~(USB_CNTR_SUSPEN | USB_CNTR_PDWN | USB_CNTR_WKUPM);
 #else
+        CNTR &= ~(USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM); // clear suspend flags
+#endif
+        //USB->ISTR = ~USB_ISTR_WKUP;
+    }
+    if(istr & USB_ISTR_SUSP){ // suspend -> still no connection, may sleep
+        usbON = 0;
+#if defined STM32F0
         CNTR |= USB_CNTR_FSUSP | USB_CNTR_LPMODE | USB_CNTR_WKUPM;
+#elif defined STM32G0
+        CNTR |= USB_CNTR_SUSPEN | USB_CNTR_WKUPM;
+#else
+        CNTR |= USB_CNTR_FSUSP | USB_CNTR_LP_MODE | USB_CNTR_WKUPM;
 #endif
         CNTR &= ~(USB_CNTR_SUSPM);
-        USB->ISTR = ~USB_ISTR_SUSP;
+        //USB->ISTR = ~USB_ISTR_SUSP;
     }
+    USB->ISTR = 0; // clear all flags
     USB->CNTR = CNTR; // rewoke interrupts
 }
 
 // here we suppose that all PIN settings done in hw_setup earlier
 void USB_setup(){
+    lastaddr = LASTADDR_DEFAULT; // clear last address settings
 #if defined STM32F3
     NVIC_DisableIRQ(USB_LP_IRQn);
     // remap USB LP & Wakeup interrupts to 75 and 76 - works only on pure F303
@@ -326,6 +373,7 @@ void USB_setup(){
     NVIC_DisableIRQ(USB_LP_CAN1_RX0_IRQn);
     NVIC_DisableIRQ(USB_HP_CAN1_TX_IRQn);
 #elif defined STM32F0
+    // All is clocking from HSI48
     NVIC_DisableIRQ(USB_IRQn);
     RCC->APB1ENR |= RCC_APB1ENR_CRSEN;
     RCC->CFGR3 &= ~RCC_CFGR3_USBSW; // reset USB
@@ -338,16 +386,33 @@ void USB_setup(){
     CRS->CR |= CRS_CR_AUTOTRIMEN; // enable auto trim
     CRS->CR |= CRS_CR_CEN; // enable freq counter & block CRS->CFGR as read-only
     RCC->CFGR |= RCC_CFGR_SW;
+#elif defined STM32G0
+    NVIC_DisableIRQ(USB_UCPD1_2_IRQn);
+    PWR->CR2 |= PWR_CR2_USV; // enable USB powering
+    //RCC->APBENR2 |= RCC_APBENR2_SYSCFGEN; // enable tacting of SYSCFG
+    // independent clocking of USB from HSI48
+    RCC->CR |= RCC_CR_HSI48ON;
+    uint32_t tmout = 16000000;
+    while(!(RCC->CR & RCC_CR_HSI48RDY)) if(--tmout == 0){ break;}
+    RCC->CCIPR2 &= ~RCC_CCIPR2_USBSEL; // select HSI48 for USB
+    RCC->APBENR1 |= RCC_APBENR1_CRSEN; // CRS clocking
+    CRS->CFGR = (31LL << CRS_CFGR_FELIM_Pos) | // tolerance (usually 31)
+                (48000LL / 1LL - 1LL) << CRS_CFGR_RELOAD_Pos | // 48MHz / 1kHZ (SOF)
+                CRS_CFGR_SYNCSRC_1; // USB SOF as sync source (0x2)
+    CRS->CR |= CRS_CR_AUTOTRIMEN | CRS_CR_CEN; // Enable autotrim and turn on Clock Recovery System
+    RCC->APBENR1 |= RCC_APBENR1_USBEN;
 #endif
+#ifndef STM32G0
     RCC->APB1ENR |= RCC_APB1ENR_USBEN;
-    //??
     USB->CNTR   = USB_CNTR_FRES; // Force USB Reset
-    for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms
-    USB->CNTR   = 0;
     USB->BTABLE = 0;
+#else
+    USB->CNTR   = USB_CNTR_USBRST;
+#endif
+    for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms
+    USB->CNTR   = USB_CNTR_RESETM; // allow only reset interrupts
     USB->DADDR  = 0;
     USB->ISTR   = 0;
-    USB->CNTR   = USB_CNTR_RESETM; // allow only reset interrupts
 #if defined STM32F3
     NVIC_EnableIRQ(USB_LP_IRQn);
 #elif defined STM32F1
@@ -355,6 +420,9 @@ void USB_setup(){
 #elif defined STM32F0
     USB->BCDR |= USB_BCDR_DPPU;
     NVIC_EnableIRQ(USB_IRQn);
+#elif defined STM32G0
+    USB->BCDR |= USB_BCDR_DPPU; // turn ON DP pullup
+    NVIC_EnableIRQ(USB_UCPD1_2_IRQn);
 #endif
 }
 
@@ -365,4 +433,6 @@ void usb_lp_isr() __attribute__ ((alias ("USB_IRQ")));
 void usb_lp_can_rx0_isr() __attribute__ ((alias ("USB_IRQ")));
 #elif defined STM32F0
 void usb_isr() __attribute__ ((alias ("USB_IRQ")));
+#elif defined STM32G0
+void usb_ucpd1_2_isr() __attribute__ ((alias ("USB_IRQ")));
 #endif
diff --git a/F1:F103/Canon_managing_device/usb_lib.h b/F1:F103/Canon_managing_device/usb_lib.h
index c6e70b0..e7ec4c9 100644
--- a/F1:F103/Canon_managing_device/usb_lib.h
+++ b/F1:F103/Canon_managing_device/usb_lib.h
@@ -19,6 +19,10 @@
 #include <stdint.h>
 #include <wchar.h>
 
+#ifndef _U_
+#define _U_         __attribute__((unused))
+#endif
+
 /******************************************************************
  *             Hardware registers etc                             *
  *****************************************************************/
@@ -30,6 +34,8 @@
 #define USB_BASE                ((uint32_t)0x40005C00)
 #elif defined STM32F3
 #include <stm32f3.h>
+#elif defined STM32G0
+#include <stm32g0.h>
 #endif
 
 // max endpoints number
@@ -38,14 +44,16 @@
  *                 Buffers size definition
  **/
 
-//  F0 - USB2_16; F1 - USB1_16; F3 - 1/2 depending on series
-#if !defined USB1_16 && !defined USB2_16
+//  F0 - USB2_16; F1 - USB1_16; F3 - 1/2 depending on series; G0 - USB32
+#if !defined USB1_16 && !defined USB2_16 && !defined USB32
 #if defined STM32F0
 #define USB2_16
 #elif defined STM32F1
 #define USB1_16
+#elif defined STM32G0
+#define USB32
 #else
-#error "Can't determine USB1_16 or USB2_16, define by hands"
+#error "Can't determine USB1_16/USB2_16/USB32, define by hands"
 #endif
 #endif
 
@@ -59,8 +67,8 @@
 #if defined STM32F0
 #define USB_BTABLE_SIZE         1024
 #elif defined STM32F3
-#define USB_BTABLE_SIZE         512
-#warning "Please, check real buffer size due to docs"
+#define USB_BTABLE_SIZE         1024
+//#warning "Please, check real buffer size due to docs"
 #else
 #error "define STM32F0 or STM32F3"
 #endif
@@ -68,16 +76,21 @@
 #if defined STM32F0
 #define USB_BTABLE_SIZE         768
 #elif defined STM32F3
-#define USB_BTABLE_SIZE         512
-#warning "Please, check real buffer size due to docs"
+#define USB_BTABLE_SIZE         768
+#elif defined STM32G0
+#define USB_BTABLE_SIZE         2048
+//#warning "Please, check real buffer size due to docs"
 #else // STM32F103: 1024 bytes but with 32-bit addressing
 #define USB_BTABLE_SIZE         1024
 #endif
 #endif // NOCAN
 
 // first 64 bytes of USB_BTABLE are registers!
-
+#ifndef STM32G0
 #define USB_BTABLE_BASE         0x40006000
+#else
+#define USB_BTABLE_BASE         0x40009800
+#endif
 #define USB                     ((USB_TypeDef *) USB_BASE)
 
 #ifdef USB_BTABLE
@@ -120,8 +133,12 @@ typedef struct {
     __IO uint32_t ISTR;
     __IO uint32_t FNR;
     __IO uint32_t DADDR;
+#ifndef USB32
     __IO uint32_t BTABLE;
-#ifdef STM32F0
+#else
+    __IO uint32_t RESERVED1; // there's no BTABLE register in STM32G0
+#endif
+#if defined STM32F0 || defined USB32
     __IO uint32_t LPMCSR;
     __IO uint32_t BCDR;
 #endif
@@ -135,16 +152,19 @@ typedef struct{
     __IO uint16_t USB_ADDR_RX;
     __IO uint16_t USB_COUNT_RX;
 #define ACCESSZ (1)
-#define BUFTYPE uint8_t
 #elif defined USB1_16
     __IO uint32_t USB_ADDR_TX;
     __IO uint32_t USB_COUNT_TX;
     __IO uint32_t USB_ADDR_RX;
     __IO uint32_t USB_COUNT_RX;
 #define ACCESSZ (2)
-#define BUFTYPE uint16_t
+#elif defined USB32
+    // 32-bit registers: addr & count in one!
+    __IO uint32_t USB_ADDR_COUNT_TX;
+    __IO uint32_t USB_ADDR_COUNT_RX;
+#define ACCESSZ (1)
 #else
-#error "Define USB1_16 or USB2_16"
+#error "Define USB1_16 (16 bits over 32bit register), USB2_16 (16 bits over 16 bit register) or USB32 (32 bist over 32 bit register)"
 #endif
 } USB_EPDATA_TypeDef;
 
@@ -303,9 +323,17 @@ typedef struct {
 
 // endpoints state
 typedef struct{
+#ifdef USB32
+    uint32_t *tx_buf;           // transmission buffer address
+#else
     uint16_t *tx_buf;           // transmission buffer address
+#endif
     uint16_t txbufsz;           // transmission buffer size
+#ifdef USB32
+    uint32_t *rx_buf;            // reception buffer address
+#else
     uint8_t *rx_buf;            // reception buffer address
+#endif
     void (*func)();             // endpoint action function
     unsigned rx_cnt  : 10;      // received data counter
 } ep_t;