add ringbuffer to USB F303 (still can't do more than 3.2Mbaud)

F303-nolib/PL2303/hardware.h

@@ -22,6 +22,8 @@
 
 #include <stm32f3.h>
 
+extern volatile uint32_t Tms;
+
 void hw_setup();
 
 #endif // __HARDWARE_H__

F303-nolib/PL2303/main.c

@@ -23,6 +23,9 @@
 
 #define USBBUFSZ    127
 
+const char *test = "123456789A123456789B123456789C123456789D123456789E123456789F123456789G123456789H123456789I123456789J123456789K123456789L123456789M123456789N123456789O123456789P123456789Q123456789R123456789S123456789T123456789U123456789V123456789W123456789X123456789Y\n"
+        "123456789A123456789B123456789C123456789D123456789E123456789F123456789G123456789H123456789I123456789J123456789K123456789L123456789M123456789N123456789O123456789P123456789Q123456789R123456789S123456789T123456789U123456789V123456789W123456789X123456789Y\n";
+
 volatile uint32_t Tms = 0;
 
 void sys_tick_handler(void){
@@ -89,5 +92,13 @@ int main(void){
             const char *ans = parse_cmd(txt);
             if(ans) USB_send(ans);
         }
+        if(Tlast){
+            usart_send("Tlast="); usart_send(u2str(Tlast)); usart_putchar('\n');
+            Tlast = 0;
+        }
+        if(starttest){
+            --starttest;
+            USB_send(test);
+        }
     }
 }

F303-nolib/PL2303/proto.c

@@ -19,6 +19,9 @@
 #include "proto.h"
 #include "usart.h"
 #include "usb.h"
+
+uint8_t starttest = 50;
+
 char *omit_spaces(const char *buf){
     while(*buf){
         if(*buf > ' ') break;
@@ -154,6 +157,8 @@ const char* helpmsg =
     "'p' - toggle USB pullup\n"
     "'N' - read number (dec, 0xhex, 0oct, bbin) and show it in decimal\n"
     "'R' - software reset\n"
+    "'T' - test usb sending a very large message\n"
+    "'U' - get USB status\n"
     "'W' - test watchdog\n"
 ;
 
@@ -168,6 +173,7 @@ static void add2buf(const char *s){
     *bptr = 0;
 }
 
+extern uint8_t usbON;
 const char *parse_cmd(const char *buf){
     initbuf();
     if(buf[1] == '\n' || !buf[1]){ // one symbol commands
@@ -190,6 +196,17 @@ const char *parse_cmd(const char *buf){
                 usart_send("Soft reset\n");
                 NVIC_SystemReset();
             break;
+            case 'T':
+                add2buf("STARTT=");
+                add2buf(u2str(Tms)); add2buf("\n");
+                starttest = 10;
+            break;
+            case 'U':
+                add2buf("USB status: ");
+                if(usbON) add2buf("ON");
+                else add2buf("OFF");
+                add2buf("\n");
+            break;
             case 'W':
                 USB_send("Wait for reboot\n");
                 usart_send("Wait for reboot\n");

F303-nolib/PL2303/proto.h

@@ -22,6 +22,8 @@
 
 #include <stm32f3.h>
 
+extern uint8_t starttest;
+
 const char *parse_cmd(const char *buf);
 char *omit_spaces(const char *buf);
 char *getnum(const char *buf, uint32_t *N);

F303-nolib/PL2303/ringbuffer.c

@@ -0,0 +1,86 @@
+/*
+ * This file is part of the pl2303 project.
+ * Copyright 2022 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 <string.h>
+#include <stm32f3.h>
+
+#include "ringbuffer.h"
+#include "usb.h"
+#include "usb_lib.h"
+
+// ring buffer
+static char ringbuffer[RBSIZE];
+// head - position of first data byte
+// tail - position of last data byte + 1
+// head == tail - empty! So, buffer can't store more than RBSIZE-1 bytes of data!
+static volatile int head = 0, tail = 0;
+
+static int datalen(){
+    if(tail >= head) return (tail - head);
+    else return (RBSIZE - head + tail);
+}
+static int restlen(){
+    return (RBSIZE - 1 - datalen());
+}
+
+TRUE_INLINE void incr(volatile int *what, int n){
+    *what += n;
+    if(*what >= RBSIZE) *what -= RBSIZE;
+}
+
+int RB_read(char s[BLOCKSIZE]){
+    int l = datalen();
+    if(!l) return 0;
+    if(l > BLOCKSIZE) l = BLOCKSIZE;
+    int _1st = RBSIZE - head;
+    if(_1st > l) _1st = l;
+    if(_1st > BLOCKSIZE) _1st = BLOCKSIZE;
+    memcpy(s, ringbuffer+head, _1st);
+    if(_1st < BLOCKSIZE && l > _1st){
+        memcpy(s+_1st, ringbuffer, l-_1st);
+        incr(&head, l);
+        return l;
+    }
+    incr(&head ,_1st);
+    return _1st;
+}
+
+static int addportion(const char *str, int l){
+    int r = restlen();
+    if(l > r) l = r;
+    if(!l) return 0;
+    int _1st = RBSIZE - tail;
+    if(_1st > l) _1st = l;
+    memcpy(ringbuffer+tail, str, _1st);
+    if(_1st < l){ // add another piece from start
+        memcpy(ringbuffer, str+_1st, l-_1st);
+    }
+    incr(&tail, l);
+    return l;
+}
+
+void RB_write(const char *str, int l){
+    if(!str || !*str) return;
+    if(!usbON) return;
+    while(l){
+        send_next();
+        int a = addportion(str, l);
+        l -= a;
+        str += a;
+    }
+}

F303-nolib/PL2303/ringbuffer.h

@@ -0,0 +1,33 @@
+/*
+ * This file is part of the pl2303 project.
+ * Copyright 2022 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
+#ifndef RINGBUFFER_H__
+#define RINGBUFFER_H__
+
+#include "usbhw.h"
+
+// ring buffer size in bytes
+#define RBSIZE      (512)
+// max reading portion size
+#define BLOCKSIZE   (USB_TXBUFSZ)
+
+int RB_read(char s[BLOCKSIZE]);
+void RB_write(const char *str, int l);
+
+#endif // RINGBUFFER_H__

F303-nolib/PL2303/usb.c

@@ -16,17 +16,39 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <string.h>
+
+#include "hardware.h"
+#include "ringbuffer.h"
 #include "usb.h"
 #include "usb_lib.h"
 
+static char usbbuff[USB_TXBUFSZ]; // temporary buffer for sending data
 static volatile uint8_t tx_succesfull = 1;
 static volatile uint8_t rxNE = 0;
 
-static int sstrlen(const char *s){
-    if(!s) return 0;
-    int l = 0;
-    while(*s++) ++l;
-    return l;
+volatile uint32_t Tlast = 0;
+
+void send_next(){
+    static int lastdsz = 0;
+    if(!tx_succesfull) return;
+    int buflen = RB_read(usbbuff);
+    if(!buflen){
+        if(lastdsz) Tlast = Tms;
+        if(lastdsz == 64) EP_Write(3, NULL, 0); // send ZLP after 64 bits packet when nothing more to send
+        lastdsz = 0;
+        return;
+    }
+    tx_succesfull = 0;
+    EP_Write(3, (uint8_t*)usbbuff, buflen);
+    lastdsz = buflen;
+}
+
+// put `buf` into queue to send
+void USB_send(const char *buf){
+    int len = strlen(buf);
+    if(!usbON || !len) return;
+    RB_write(buf, len); // this is a blocking procedure if there's too little free memory in buffer
 }
 
 // interrupt IN handler (never used?)
@@ -45,6 +67,7 @@ static void transmit_Handler(){ // EP3IN
     uint16_t epstatus = KEEP_DTOG_STAT(USB->EPnR[3]);
     // clear CTR keep DTOGs & STATs
     USB->EPnR[3] = (epstatus & ~(USB_EPnR_CTR_TX)); // clear TX ctr
+    send_next();
 }
 
 static void receive_Handler(){ // EP2OUT
@@ -53,67 +76,6 @@ static void receive_Handler(){ // EP2OUT
     USB->EPnR[2] = (epstatus & ~(USB_EPnR_CTR_RX)); // clear RX ctr
 }
 
-static int usbwr(const char *buf, int l){
-    uint32_t ctra = 1000000;
-    while(--ctra && tx_succesfull == 0){
-        IWDG->KR = IWDG_REFRESH;
-    }
-    tx_succesfull = 0;
-    EP_Write(3, (uint8_t*)buf, l);
-    ctra = 1000000;
-    while(--ctra && tx_succesfull == 0){
-        IWDG->KR = IWDG_REFRESH;
-    }
-    if(tx_succesfull == 0){usbON = 0; return 1;} // usb is OFF?
-    return 0;
-}
-
-static char usbbuff[USB_TXBUFSZ-1]; // temporary buffer (63 - to prevent need of ZLP)
-static int buflen = 0; // amount of symbols in usbbuff
-
-// send next up to 63 bytes of data in usbbuff
-static void send_next(){
-    if(!buflen || !tx_succesfull) return;
-    tx_succesfull = 0;
-    EP_Write(3, (uint8_t*)usbbuff, buflen);
-    buflen = 0;
-}
-
-// blocking sending
-static void USB_send_blk(const char *buf, int len){
-    if(!usbON || !len) return; // USB disconnected
-    if(buflen){
-        usbwr(usbbuff, buflen);
-        buflen = 0;
-    }
-    int needzlp = 0;
-    while(len){
-        if(len == USB_TXBUFSZ) needzlp = 1;
-        int s = (len > USB_TXBUFSZ) ? USB_TXBUFSZ : len;
-        if(usbwr(buf, s)) return;
-        len -= s;
-        buf += s;
-    }
-    if(needzlp){
-        usbwr(NULL, 0);
-    }
-}
-
-// unblocking sending - just fill a buffer
-void USB_send(const char *buf){
-    int len = sstrlen(buf);
-    if(!usbON || !len) return;
-    if(len > USB_TXBUFSZ-1 - buflen){
-        usbwr(usbbuff, buflen);
-        buflen = 0;
-    }
-    if(len > USB_TXBUFSZ-1){
-        USB_send_blk(buf, len);
-        return;
-    }
-    while(len--) usbbuff[buflen++] = *buf++;
-}
-
 void usb_proc(){
     switch(USB_Dev.USB_Status){
         case USB_STATE_CONFIGURED:

F303-nolib/PL2303/usb.h

@@ -24,7 +24,10 @@
 
 #define BUFFSIZE   (64)
 
+extern volatile uint32_t Tlast;
+
 void usb_proc();
+void send_next();
 void USB_send(const char *buf);
 int USB_receive(char *buf);
 

F303-nolib/PL2303/usbhw.c

@@ -27,11 +27,14 @@ void USB_setup(){
     // setup pullup
     RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
     USBPU_OFF();
-    GPIOA->MODER = (GPIOA->MODER & (~GPIO_MODER_MODER15_Msk | GPIO_MODER_MODER11_Msk | GPIO_MODER_MODER12_Msk)) |
-            GPIO_MODER_MODER11_AF | GPIO_MODER_MODER12_AF | GPIO_MODER_MODER15_O;
+    //GPIOA->MODER = (GPIOA->MODER & ~(GPIO_MODER_MODER15_Msk | GPIO_MODER_MODER11_Msk | GPIO_MODER_MODER12_Msk)) |
+    GPIOA->MODER = (GPIOA->MODER & (MODER_CLR(11) & MODER_CLR(12) & MODER_CLR(15))) |
+            (MODER_AF(11) | MODER_AF(12) | MODER_O(15));
+            //(GPIO_MODER_MODER11_AF | GPIO_MODER_MODER12_AF | GPIO_MODER_MODER15_O);
     // USB - alternate function 14 @ pins PA11/PA12
     GPIOA->AFR[1] = (GPIOA->AFR[1] & ~(GPIO_AFRH_AFRH3_Msk | GPIO_AFRH_AFRH4_Msk)) |
-            (14 << (3 * 4)) | (14 << (4 * 4));
+            //AFR1(14, 11) | AFR1(14, 12);
+            AFRf(14, 11) | AFRf(14, 12);
     RCC->APB1ENR |= RCC_APB1ENR_USBEN;
     USB->CNTR   = USB_CNTR_FRES; // Force USB Reset
     for(uint32_t ctr = 0; ctr < 72000; ++ctr) nop(); // wait >1ms