diff --git a/F3:F303/NitrogenFlooding/Makefile b/F3:F303/NitrogenFlooding/Makefile
index eb27ee2..a4468d2 100644
--- a/F3:F303/NitrogenFlooding/Makefile
+++ b/F3:F303/NitrogenFlooding/Makefile
@@ -4,6 +4,7 @@ MCU			:= F302xc
 # change this linking script depending on particular MCU model,
 LDSCRIPT	:= stm32f302xB.ld
 DEFINES := -DUSB1_16
+LDADD := -lm
 
 include ../makefile.f3
 include ../../makefile.stm32
diff --git a/F3:F303/NitrogenFlooding/Readme.md b/F3:F303/NitrogenFlooding/Readme.md
index 063860b..4b84c25 100644
--- a/F3:F303/NitrogenFlooding/Readme.md
+++ b/F3:F303/NitrogenFlooding/Readme.md
@@ -59,7 +59,7 @@ Automated liquid nitrogen flooding machine
 |  48     | PB11        | SCRN RST    | slow out    | Screen reset     |
 |  49     | (VSS)       |             |             |                  |
 |  50     | (VDD)       |             |             |                  |
-|  51     | PB12        | SCRN NSS    | slow out    | Screen activate  |
+|  51     | PB12        | SCRN LED    | slow out    | Screen LEDs on   |
 |  52     | PB13        | SCRN SCK    | AF5         | SPI for screen   |
 |  53     | PB14        | SCRN MISO   | AF5         |                  |
 |  54     | PB15        | SCRN MOSI   | AF5         |                  |
@@ -143,7 +143,7 @@ Automated liquid nitrogen flooding machine
 |  96     | PB9         | -           | -           |                  |
 |  47     | PB10        | SCRN DCRS   | slow out    | Screen data/cmd  |
 |  48     | PB11        | SCRN RST    | slow out    | Screen reset     |
-|  51     | PB12        | SCRN NSS    | slow out    | Screen activate  |
+|  51     | PB12        | SCRN LED    | slow out    | Screen LEDs on   |
 |  52     | PB13        | SCRN SCK    | AF5         | SPI for screen   |
 |  53     | PB14        | SCRN MISO   | AF5         |                  |
 |  54     | PB15        | SCRN MOSI   | AF5         |                  |
@@ -208,6 +208,8 @@ Automated liquid nitrogen flooding machine
 ### DMA1
 
 - Channel 1 - ADC1
+- Channel 4 - SPI2 Rx
+- Channel 5 - SPI2 Tx
 - Channel 6 - I2C1 Tx
 - Channel 7 - I2C1 Rx
 
diff --git a/F3:F303/NitrogenFlooding/hardware.c b/F3:F303/NitrogenFlooding/hardware.c
index f644ce2..420c181 100644
--- a/F3:F303/NitrogenFlooding/hardware.c
+++ b/F3:F303/NitrogenFlooding/hardware.c
@@ -18,6 +18,7 @@
 
 #include "hardware.h"
 #include "i2c.h"
+#include "spi.h"
 
 int LEDsON = 1;
 
@@ -47,10 +48,10 @@ TRUE_INLINE void gpio_setup(){
     GPIOB->AFR[0] = AFRf(4, 6) | AFRf(4, 7);
     GPIOB->AFR[1] = AFRf(5, 13) | AFRf(5, 14) | AFRf(5, 15);
     GPIOB->MODER = MODER_O(0) | MODER_AF(6) | MODER_AF(7) | MODER_O(10) | MODER_O(11) | MODER_O(12) | MODER_AF(13)
-                 | MODER_AF(14) | MODER_AF(15);
-    GPIOB->OSPEEDR = OSPEED_HI(6) | OSPEED_HI(7) | OSPEED_MED(13) | OSPEED_MED(14) | OSPEED_MED(15);
+                 | MODER_AF(14) | MODER_AF(15);  // 10-DC, 11-RST, 12-LED, 13-SCK, 14-MISO, 15-MOSI
+    GPIOB->OSPEEDR = OSPEED_HI(6) | OSPEED_HI(7) | OSPEED_HI(13) | OSPEED_HI(14) | OSPEED_HI(15);
     GPIOB->OTYPER = 0;
-    GPIOB->PUPDR = 0;
+    GPIOB->PUPDR = PUPD_PU(14); // PU MISO
 
     // PORT C
     //GPIOC->ODR = 0;
@@ -134,7 +135,8 @@ TRUE_INLINE void iwdg_setup(){
 void hw_setup(){
     RCC->AHBENR |= RCC_AHBENR_DMA1EN | RCC_AHBENR_DMA2EN;
     gpio_setup();
-    i2c_setup(HIGH_SPEED);
+    i2c_setup(LOW_SPEED);
+    spi_setup();
     pwm_setup();
 #ifndef EBUG
     iwdg_setup();
diff --git a/F3:F303/NitrogenFlooding/hardware.h b/F3:F303/NitrogenFlooding/hardware.h
index 986a517..bfbbaa2 100644
--- a/F3:F303/NitrogenFlooding/hardware.h
+++ b/F3:F303/NitrogenFlooding/hardware.h
@@ -49,6 +49,21 @@
 #define LED_on(x)  do{if(LEDsON) pin_clear(LEDs_port, 1<<(8+x));}while(0)
 #define LED_get(x)  (LEDs_port->IDR & 1<<(8+x) ? 0 : 1)
 
+// screen LEDon/off - PB12; reset - PB11; data/command - PB10
+#define SCRN_LED_pin    (1<<12)
+#define SCRN_LED_port   (GPIOB)
+#define SCRN_LED_set(a) do{if(a) pin_set(SCRN_LED_port, SCRN_LED_pin); else pin_clear(SCRN_LED_port, SCRN_LED_pin);}while(0)
+#define SCRN_LED_get()  (SCRN_LED_port->IDR & SCRN_LED_pin ? 1: 0)
+#define SCRN_RST_pin    (1<<11)
+#define SCRN_RST_port   (GPIOB)
+#define SCRN_RST_set(a) do{if(a) pin_set(SCRN_RST_port, SCRN_RST_pin); else pin_clear(SCRN_RST_port, SCRN_RST_pin);}while(0)
+#define SCRN_RST_get()  (SCRN_RST_port->IDR & SCRN_RST_pin ? 1: 0)
+#define SCRN_DCX_pin    (1<<10)
+#define SCRN_DCX_port   (GPIOB)
+#define SCRN_DCX_get()  (SCRN_DCX_port->IDR & SCRN_DCX_pin ? 1: 0)
+#define SCRN_Data()     do{pin_set(SCRN_DCX_port, SCRN_DCX_pin);}while(0)
+#define SCRN_Command()  do{pin_clear(SCRN_DCX_port, SCRN_DCX_pin);}while(0)
+
 // Buttons amount
 #define BTNSNO      (7)
 #define BTNs_port   GPIOD
diff --git a/F3:F303/NitrogenFlooding/i2c.c b/F3:F303/NitrogenFlooding/i2c.c
index 41e85c9..881577a 100644
--- a/F3:F303/NitrogenFlooding/i2c.c
+++ b/F3:F303/NitrogenFlooding/i2c.c
@@ -42,7 +42,7 @@ static uint8_t I2Cbuf[256], i2cbuflen = 0; // buffer for DMA tx/rx and its len
 static inline int isI2Cbusy(){
     cntr = Tms;
     do{
-        if(Tms - cntr > I2C_TIMEOUT){ USND("Timeout, DMA transfer in progress?\n"); return 1;}
+        if(Tms - cntr > I2C_TIMEOUT){ USND("Timeout, DMA transfer in progress?"); return 1;}
     }while(I2Cbusy);
     return 0;
 }
@@ -103,7 +103,7 @@ static uint8_t i2c_start(uint8_t busychk){
         while(I2C1->ISR & I2C_ISR_BUSY){
             IWDG->KR = IWDG_REFRESH;
             if(Tms - cntr > I2C_TIMEOUT){
-                USND("Line busy\n");
+                USND("Line busy");
                 return 0;  // check busy
         }}
     }
@@ -111,7 +111,7 @@ static uint8_t i2c_start(uint8_t busychk){
     while(I2C1->CR2 & I2C_CR2_START){
         IWDG->KR = IWDG_REFRESH;
         if(Tms - cntr > I2C_TIMEOUT){
-            USND("No start\n");
+            USND("No start");
             return 0; // check start
     }}
     return 1;
@@ -143,11 +143,11 @@ static uint8_t write_i2cs(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t s
             IWDG->KR = IWDG_REFRESH;
             if(I2C1->ISR & I2C_ISR_NACKF){
                 I2C1->ICR |= I2C_ICR_NACKCF;
-                //USND("NAK\n");
+                DBG("NAK");
                 return 0;
             }
             if(Tms - cntr > I2C_TIMEOUT){
-                //USND("Timeout\n");
+                DBG("Timeout");
                 return 0;
             }
         }
@@ -163,7 +163,10 @@ static uint8_t write_i2cs(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t s
 }
 
 uint8_t write_i2c(uint8_t addr, uint8_t *data, uint8_t nbytes){
-    if(isI2Cbusy()) return 0;
+    if(isI2Cbusy()){
+        DBG("I2C busy");
+        return 0;
+    }
     return write_i2cs(addr, data, nbytes, 1);
 }
 
@@ -203,11 +206,11 @@ static uint8_t read_i2cb(uint8_t addr, uint8_t *data, uint8_t nbytes, uint8_t bu
             IWDG->KR = IWDG_REFRESH;
             if(I2C1->ISR & I2C_ISR_NACKF){
                 I2C1->ICR |= I2C_ICR_NACKCF;
-                //USND("NAK\n");
+                //DBG("NAK");
                 return 0;
             }
             if(Tms - cntr > I2C_TIMEOUT){
-                //USND("Timeout\n");
+                //DBG("Timeout");
                 return 0;
             }
         }
@@ -250,22 +253,22 @@ uint8_t read_i2c_reg16(uint8_t addr, uint16_t reg16, uint8_t *data, uint8_t nbyt
 void i2c_init_scan_mode(){
     i2caddr = 1; // start from 1 as 0 is a broadcast address
     I2C_scan_mode = 1;
+    DBG("init scan");
 }
 
 // return 1 if next addr is active & return in as `addr`
 // if addresses are over, return 1 and set addr to I2C_NOADDR
 // if scan mode inactive, return 0 and set addr to I2C_NOADDR
 int i2c_scan_next_addr(uint8_t *addr){
-    if(isI2Cbusy()) return 0;
+    if(isI2Cbusy()){
+        DBG("scan: busy");
+        return 0;
+    }
     *addr = i2caddr;
     if(i2caddr == I2C_ADDREND){
-        *addr = I2C_ADDREND;
         I2C_scan_mode = 0;
         return 0;
     }
-    /*while(!u3txrdy);
-    USND("Addr: "); USND(uhex2str(i2caddr)); USND("\n");
-    usart3_sendbuf();*/
     uint8_t byte;
     if(!read_i2c((i2caddr++)<<1, &byte, 1)) return 0;
     return 1;
@@ -274,10 +277,10 @@ int i2c_scan_next_addr(uint8_t *addr){
 // dump I2Cbuf
 void i2c_bufdudump(){
     if(goterr){
-        USND("Last transfer ends with error!\n");
+        USND("Last transfer ends with error!");
         goterr = 0;
     }
-    USND("I2C buffer:\n");
+    USND("I2C buffer:");
     hexdump(USB_sendstr, I2Cbuf, i2cbuflen);
 }
 
diff --git a/F3:F303/NitrogenFlooding/main.c b/F3:F303/NitrogenFlooding/main.c
index f29f1dc..4638c7a 100644
--- a/F3:F303/NitrogenFlooding/main.c
+++ b/F3:F303/NitrogenFlooding/main.c
@@ -17,12 +17,14 @@
  */
 
 #include "adc.h"
+#include "BMP280.h"
 //#include "buttons.h"
 //#include "can.h"
 //#include "flash.h"
 #include "hardware.h"
 #include "i2c.h"
 #include "proto.h"
+#include "strfunc.h"
 #include "usb.h"
 
 #define MAXSTRLEN    RBINSZ
@@ -47,6 +49,7 @@ int main(void){
     USB_setup();
     //CAN_setup(the_conf.CANspeed);
     adc_setup();
+    BMP280_setup(0);
     USBPU_ON();
     uint32_t ctr = 0;
     // CAN_message *can_mesg;
@@ -86,7 +89,23 @@ int main(void){
                 USB_sendstr(") - found device\n");
             }
         }
-        i2c_have_DMA_Rx(); // check if there's DMA Rx complete
+        //i2c_have_DMA_Rx(); // check if there's DMA Rx complete
+        BMP280_process();
+        BMP280_status s = BMP280_get_status();
+        if(s == BMP280_RDY){ // data ready - get it
+            float T, P, H;
+            if(BMP280_getdata(&T, &P, &H)){
+                USB_sendstr("T="); USB_sendstr(float2str(T, 2)); USB_sendstr("\nP=");
+                USB_sendstr(float2str(P, 1));
+                P *= 0.00750062f; USB_sendstr("\nPmm="); USB_sendstr(float2str(P, 1));
+                USB_sendstr("\nH="); USB_sendstr(float2str(H, 1));
+                USB_sendstr("\nTdew="); USB_sendstr(float2str(Tdew(T, H), 1));
+                newline();
+            }else USB_sendstr("Can't read data\n");
+        }else if(s == BMP280_ERR){
+            USB_sendstr("BME280 error\n");
+            BMP280_init();
+        }
         int l = USB_receivestr(inbuff, MAXSTRLEN);
         if(l < 0) USB_sendstr("ERROR: USB buffer overflow or string was too long\n");
         else if(l){
diff --git a/F3:F303/NitrogenFlooding/nitrogen.bin b/F3:F303/NitrogenFlooding/nitrogen.bin
index 26b440d..ffeaab0 100755
Binary files a/F3:F303/NitrogenFlooding/nitrogen.bin and b/F3:F303/NitrogenFlooding/nitrogen.bin differ
diff --git a/F3:F303/NitrogenFlooding/nitrogen.files b/F3:F303/NitrogenFlooding/nitrogen.files
index 0b934c7..a6753f2 100644
--- a/F3:F303/NitrogenFlooding/nitrogen.files
+++ b/F3:F303/NitrogenFlooding/nitrogen.files
@@ -1,3 +1,5 @@
+BMP280.c
+BMP280.h
 adc.c
 adc.h
 buttons.c
@@ -16,6 +18,8 @@ hashgen/hdr.h
 hashgen/test.c
 i2c.c
 i2c.h
+ili9341.c
+ili9341.h
 main.c
 pdnuart.c
 pdnuart.h
@@ -23,6 +27,8 @@ proto.c
 proto.h
 ringbuffer.c
 ringbuffer.h
+spi.c
+spi.h
 steppers.c
 steppers.h
 strfunc.c
diff --git a/F3:F303/NitrogenFlooding/proto.c b/F3:F303/NitrogenFlooding/proto.c
index e9c86e9..6ac418c 100644
--- a/F3:F303/NitrogenFlooding/proto.c
+++ b/F3:F303/NitrogenFlooding/proto.c
@@ -17,9 +17,11 @@
  */
 
 #include "adc.h"
+#include "BMP280.h"
 #include "hardware.h"
 #include "i2c.h"
 #include "proto.h"
+#include "ili9341.h"
 #include "strfunc.h"
 #include "version.inc"
 
@@ -37,21 +39,30 @@ static int goodstub(const char *cmd, int parno, const char *carg, int32_t iarg){
     return RET_GOOD;
 }
 
+// send over USB cmd[parno][=i]
 static void sendkey(const char *cmd, int parno, int32_t i){
     USB_sendstr(cmd);
     if(parno > -1) USB_sendstr(u2str((uint32_t)parno));
     USB_putbyte('='); USB_sendstr(i2str(i)); newline();
 }
+// `sendkey` for floating parameter
 static void sendkeyf(const char *cmd, int parno, float f){
     USB_sendstr(cmd);
     if(parno > -1) USB_sendstr(u2str((uint32_t)parno));
     USB_putbyte('='); USB_sendstr(float2str(f, 2)); newline();
 }
+// `sendkey` for uint32_t
 static void sendkeyu(const char *cmd, int parno, uint32_t u){
     USB_sendstr(cmd);
     if(parno > -1) USB_sendstr(u2str((uint32_t)parno));
     USB_putbyte('='); USB_sendstr(u2str(u)); newline();
 }
+// `sendkey` for uint32_t out in hex
+static void sendkeyuhex(const char *cmd, int parno, uint32_t u){
+    USB_sendstr(cmd);
+    if(parno > -1) USB_sendstr(u2str((uint32_t)parno));
+    USB_putbyte('='); USB_sendstr(uhex2str(u)); newline();
+}
 
 static int leds(const char *cmd, int parno, const char *c, int32_t i){
     if(parno < 0){ // enable/disable all
@@ -72,6 +83,30 @@ static int leds(const char *cmd, int parno, const char *c, int32_t i){
     return RET_GOOD;
 }
 
+static int bme(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32_t _U_ i){
+    if(BMP280_get_status() == BMP280_NOTINIT){
+        DBG("Need 2 init");
+        if(!BMP280_init()){
+            USND("Can't init");
+            return RET_BAD;
+        }
+    }
+    if(!BMP280_start()) return RET_BAD;
+    return RET_GOOD;
+}
+
+static int bmefilter(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32_t _U_ i){
+    BMP280_Filter f = BMP280_FILTER_OFF;
+    if(c){
+        if(i < 0 || i >= BMP280_FILTERMAX) return RET_WRONGARG;
+        f = (BMP280_Filter) i;
+        BMP280_setfilter(f);
+        if(!BMP280_init()) return RET_BAD;
+    }
+    sendkey(cmd, -1, BMP280_getfilter());
+    return RET_GOOD;
+}
+
 static int buzzer(const char *cmd, int _U_ parno, const char _U_ *c, int32_t i){
     if(c){
         if(i > 0) BUZZER_ON();
@@ -88,9 +123,29 @@ static int i2scan(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32_t
 static int i2addr(const char *cmd, int _U_ parno, const char *c, int32_t i){
     if(c){
         if(i < 0 || i>= I2C_ADDREND) return RET_WRONGARG;
-        I2Caddress = (uint8_t) i;
+        I2Caddress = ((uint8_t) i)<<1;
     }
-    sendkey(cmd, -1, I2Caddress);
+    sendkey(cmd, -1, I2Caddress>>1);
+    return RET_GOOD;
+}
+static int i2reg(const char *cmd, int parno, const char _U_ *c, int32_t i){
+    if(parno < 0 || parno > 127) return RET_WRONGPARNO;
+    uint8_t d[2];
+    if(c){
+        if(i < 0 || i > 255) return RET_WRONGARG;
+        d[0] = parno; d[1] = (uint8_t)i;
+        if(!write_i2c(I2Caddress, d, 2)) return RET_BAD;
+    }
+    if(!read_i2c_reg(I2Caddress, (uint8_t)parno, d, 1)) return RET_BAD;
+    sendkey(cmd, parno, d[0]);
+    return RET_GOOD;
+}
+static int i2read(const char _U_ *cmd, int parno, const char _U_ *c, int32_t _U_ i){
+    uint8_t buf[128];
+    if(parno < 0 || parno > 128) return RET_WRONGPARNO;
+    if(!read_i2c(I2Caddress, buf, (uint8_t)parno)) return RET_BAD;
+    USB_sendstr("I2C got data:\n");
+    hexdump(USB_sendstr, buf, parno);
     return RET_GOOD;
 }
 
@@ -142,6 +197,45 @@ static int pwm(const char *cmd, int parno, const char *c, int32_t i){
     return RET_GOOD;
 }
 
+static int scrnled(const char *cmd, int _U_ parno, const char *c, int32_t i){
+    if(c) SCRN_LED_set(i);
+    sendkeyu(cmd, -1, SCRN_LED_get());
+    return RET_GOOD;
+}
+static int scrndcr(const char *cmd, int _U_ parno, const char *c, int32_t i){
+    if(c){
+        if(i) SCRN_Data();
+        else SCRN_Command();
+    }
+    sendkeyu(cmd, -1, SCRN_DCX_get());
+    return RET_GOOD;
+}
+static int scrnrst(const char *cmd, int _U_ parno, const char *c, int32_t i){
+    if(c) SCRN_RST_set(i);
+    sendkeyu(cmd, -1, SCRN_RST_get());
+    return RET_GOOD;
+}
+static int scrnrdwr(const char *cmd, int parno, const char *c, int32_t i){
+    if(parno < 0) return RET_WRONGPARNO;
+    if(c){
+        if(i < 0 || i > 255) return RET_WRONGARG;
+        if(!ili9341_writereg(parno, (uint8_t*)&i, 1)) return RET_BAD;
+    }
+    i = 0;
+    if(!ili9341_readreg(parno, (uint8_t*)&i, 1)) return RET_BAD;
+    sendkeyu(cmd, parno, i);
+    return RET_GOOD;
+}
+static int scrnrdwr4(const char *cmd, int parno, const char *c, int32_t i){
+    if(parno < 0) return RET_WRONGPARNO;
+    if(c){
+        if(!ili9341_writereg(parno, (uint8_t*)&i, 4)) return RET_BAD;
+    }
+    if(!ili9341_readreg(parno, (uint8_t*)&i, 4)) return RET_BAD;
+    sendkeyuhex(cmd, parno, i);
+    return RET_GOOD;
+}
+
 typedef struct{
     int (*fn)(const char*, int, const char*, int32_t);
     const char *cmd;
@@ -151,6 +245,8 @@ typedef struct{
 commands cmdlist[] = {
     {goodstub, "stub", "simple stub"},
     {NULL, "Different commands", NULL},
+    {bme, "BME", "get pressure, temperature and humidity"},
+    {bmefilter, "BMEf", "set filter (0..4)"},
     {buzzer, "buzzer", "get/set (0 - off, 1 - on) buzzer"},
     {leds, "LED", "LEDx=y; where x=0..3 to work with single LED (then y=1-set, 0-reset, 2-toggle), absent to work with all (y=0 - disable, 1-enable)"},
     {pwm, "pwm", "set/get x channel (0..3) pwm value (0..100)"},
@@ -158,7 +254,15 @@ commands cmdlist[] = {
     {tms, "tms", "print Tms"},
     {NULL, "I2C commands", NULL},
     {i2addr, "iicaddr", "set/get I2C address"},
+    {i2read, "iicread", "read X (0..128) bytes"},
+    {i2reg, "iicreg", "read/write I2C register"},
     {i2scan, "iicscan", "scan I2C bus"},
+    {NULL, "Screen commands", NULL},
+    {scrnled, "Sled", "turn on/off screen lights"},
+    {scrndcr, "Sdcr", "set data(1)/command(0)"},
+    {scrnrst, "Srst", "reset (1/0)"},
+    {scrnrdwr, "Sreg", "read/write 8-bit register"},
+    {scrnrdwr4, "Sregx", "read/write 32-bit register"},
     {NULL, "ADC commands", NULL},
     {adcval, "ADC", "get ADCx value (without x - for all)"},
     {adcvoltage, "ADCv", "get ADCx voltage (without x - for all)"},
diff --git a/F3:F303/NitrogenFlooding/strfunc.c b/F3:F303/NitrogenFlooding/strfunc.c
index 8dca52b..140638a 100644
--- a/F3:F303/NitrogenFlooding/strfunc.c
+++ b/F3:F303/NitrogenFlooding/strfunc.c
@@ -272,7 +272,7 @@ const char *getint(const char *txt, int32_t *I){
 static const float pwr10[] = {1.f, 10.f, 100.f, 1000.f, 10000.f};
 static const float rounds[] = {0.5f, 0.05f, 0.005f, 0.0005f, 0.00005f};
 #define P10L  (sizeof(pwr10)/sizeof(uint32_t) - 1)
-const char *float2str(float x, uint8_t prec){
+char *float2str(float x, uint8_t prec){
     static char str[16] = {0}; // -117.5494E-36\0 - 14 symbols max!
     if(prec > P10L) prec = P10L;
     if(isnan(x)){ memcpy(str, "NAN", 4); return str;}
diff --git a/F3:F303/NitrogenFlooding/strfunc.h b/F3:F303/NitrogenFlooding/strfunc.h
index 9c77a72..b4536d7 100644
--- a/F3:F303/NitrogenFlooding/strfunc.h
+++ b/F3:F303/NitrogenFlooding/strfunc.h
@@ -25,8 +25,8 @@ void hexdump(int (*sendfun)(const char *s), uint8_t *arr, uint16_t len);
 char *u2str(uint32_t val);
 char *i2str(int32_t i);
 char *uhex2str(uint32_t val);
+char *float2str(float x, uint8_t prec);
 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);
-const char *float2str(float x, uint8_t prec);
 //void mymemcpy(char *dest, const char *src, int len);
diff --git a/F3:F303/NitrogenFlooding/version.inc b/F3:F303/NitrogenFlooding/version.inc
index 1d5ece6..4d2cf81 100644
--- a/F3:F303/NitrogenFlooding/version.inc
+++ b/F3:F303/NitrogenFlooding/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "56"
-#define BUILD_DATE "2023-05-03"
+#define BUILD_NUMBER "110"
+#define BUILD_DATE "2023-05-08"
diff --git a/F3:F303/inc/Fx/common_macros.h b/F3:F303/inc/Fx/common_macros.h
index 8bdc4de..20b8535 100644
--- a/F3:F303/inc/Fx/common_macros.h
+++ b/F3:F303/inc/Fx/common_macros.h
@@ -40,6 +40,10 @@
 #define NULL (0)
 #endif
 
+#ifndef _U_
+#define _U_ __attribute__((__unused__))
+#endif
+
 // some good things from CMSIS
 #define nop()   __NOP()
 
diff --git a/makefile.stm32 b/makefile.stm32
index d69ab20..6e51ee4 100644
--- a/makefile.stm32
+++ b/makefile.stm32
@@ -96,7 +96,7 @@ release: LDFLAGS += -flto
 release: $(TARGFILE) bin list size
 
 #debug: add debug flags
-debug: CFLAGS += -DEBUG -Werror -g3 -gdwarf-2 
+debug: CFLAGS += -DEBUG -Werror -g3 -gdwarf-2
 debug: TARGET := DEBUG
 debug: $(TARGFILE) bin list size
 
@@ -145,7 +145,7 @@ $(LIST): $(ELF)
 
 $(ELF): $(OBJDIR) $(OBJS)
 	@echo "  LD      $(ELF)"
-	$(LD) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(ELF)
+	$(LD) $(LDFLAGS) $(OBJS) $(LDLIBS) -o $(ELF) $(LDADD)
 
 size: $(ELF)
 	$(SIZE) $(ELF)    
@@ -158,6 +158,7 @@ clean:
 flash: $(BIN)
 	@echo "  FLASH  $(BIN)"
 	$(STFLASH) write $(BIN) 0x8000000
+	$(STFLASH) reset
 
 boot: $(BIN)
 	@echo "  LOAD $(BIN) through bootloader"