diff --git a/F3:F303/NitrogenFlooding/adc.c b/F3:F303/NitrogenFlooding/adc.c
index 9247386..1f84b63 100644
--- a/F3:F303/NitrogenFlooding/adc.c
+++ b/F3:F303/NitrogenFlooding/adc.c
@@ -114,7 +114,7 @@ uint16_t getADCval(int nch){
     int addr = nch, adval = NUMBER_OF_ADC1_CHANNELS;
     if(nch >= NUMBER_OF_ADC1_CHANNELS){
         adval = NUMBER_OF_ADC2_CHANNELS;
-        addr += ADC2START;
+        addr += ADC2START - NUMBER_OF_ADC1_CHANNELS;
     }
     for(int i = 0; i < 9; ++i, addr += adval) // first we should prepare array for optmed
         p[i] = ADC_array[addr];
diff --git a/F3:F303/NitrogenFlooding/hardware.c b/F3:F303/NitrogenFlooding/hardware.c
index 8bf160c..f644ce2 100644
--- a/F3:F303/NitrogenFlooding/hardware.c
+++ b/F3:F303/NitrogenFlooding/hardware.c
@@ -73,8 +73,8 @@ TRUE_INLINE void gpio_setup(){
 
     // PORT E
     //GPIOE->ODR = 0;
-    GPIOE->AFR[0] = 0;
-    GPIOE->AFR[1] = AFRf(2, 2) | AFRf(2, 3) | AFRf(2, 4) | AFRf(2, 5);
+    GPIOE->AFR[0] = AFRf(2, 2) | AFRf(2, 3) | AFRf(2, 4) | AFRf(2, 5);
+    GPIOE->AFR[1] = 0;
     GPIOE->MODER = MODER_AF(2) | MODER_AF(3) | MODER_AF(4) | MODER_AF(5) | MODER_O(8) | MODER_O(9) | MODER_O(10) | MODER_O(11);
     GPIOE->OSPEEDR = 0;
     GPIOE->OTYPER = 0;
@@ -92,12 +92,15 @@ TRUE_INLINE void gpio_setup(){
 
 TRUE_INLINE void pwm_setup(){
     TIM3->CR1 = TIM_CR1_ARPE;
-    TIM3->PSC = 1999; // 48M/2000 = 24kHz
+    TIM3->PSC = 7199; // 72M/7200 = 10kHz; PWMfreq=10k/100=100Hz
     // PWM mode 1 (active -> inactive)
     TIM3->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC2M_2 | TIM_CCMR1_OC2M_1;
     TIM3->CCMR2 = TIM_CCMR2_OC3M_2 | TIM_CCMR2_OC3M_1 | TIM_CCMR2_OC4M_2 | TIM_CCMR2_OC4M_1;
     TIM3->CCR1 = 0;
-    TIM3->ARR = 255; // 8bit PWM
+    TIM3->CCR2 = 0;
+    TIM3->CCR3 = 0;
+    TIM3->CCR4 = 0;
+    TIM3->ARR = PWM_CCR_MAX-1; // 8bit PWM
     TIM3->BDTR |= TIM_BDTR_MOE; // enable main output
     TIM3->CCER = TIM_CCER_CC1E | TIM_CCER_CC2E | TIM_CCER_CC3E | TIM_CCER_CC4E;
     TIM3->CR1 |= TIM_CR1_CEN;
@@ -138,7 +141,7 @@ void hw_setup(){
 #endif
 }
 
-void setPWM(int nch, uint8_t val){
+void setPWM(int nch, uint16_t val){
     switch(nch){
         case 0:
             TIM3->CCR1 = val;
diff --git a/F3:F303/NitrogenFlooding/hardware.h b/F3:F303/NitrogenFlooding/hardware.h
index 53792e9..986a517 100644
--- a/F3:F303/NitrogenFlooding/hardware.h
+++ b/F3:F303/NitrogenFlooding/hardware.h
@@ -26,6 +26,9 @@
 #define PCLK    (72000000)
 #endif
 
+// Max PWM CCR1 value (->1)
+#define PWM_CCR_MAX (100)
+
 // USB pullup: PC9
 #define USBPU_port  GPIOC
 #define USBPU_pin   (1<<9)
@@ -77,5 +80,5 @@ extern int LEDsON;
 uint8_t MSB(uint16_t val);
 void hw_setup();
 
-void setPWM(int nch, uint8_t val);
+void setPWM(int nch, uint16_t val);
 uint8_t getPWM(int nch);
diff --git a/F3:F303/NitrogenFlooding/nitrogen.bin b/F3:F303/NitrogenFlooding/nitrogen.bin
index 05e6931..26b440d 100755
Binary files a/F3:F303/NitrogenFlooding/nitrogen.bin and b/F3:F303/NitrogenFlooding/nitrogen.bin differ
diff --git a/F3:F303/NitrogenFlooding/openocd.cfg b/F3:F303/NitrogenFlooding/openocd.cfg
index 0210594..ad3c59d 100644
--- a/F3:F303/NitrogenFlooding/openocd.cfg
+++ b/F3:F303/NitrogenFlooding/openocd.cfg
@@ -1,4 +1,4 @@
 set FLASH_SIZE 0x20000
 
-source [find interface/stlink-v2-1.cfg]
+source [find interface/stlink.cfg]
 source [find target/stm32f3x.cfg]
diff --git a/F3:F303/NitrogenFlooding/proto.c b/F3:F303/NitrogenFlooding/proto.c
index 5f702f5..e9c86e9 100644
--- a/F3:F303/NitrogenFlooding/proto.c
+++ b/F3:F303/NitrogenFlooding/proto.c
@@ -29,7 +29,11 @@
 static uint8_t I2Caddress = 0;
 
 // parno - number of parameter (or -1); cargs - string with arguments (after '=') (==NULL for getter), iarg - integer argument
-static int goodstub(const char _U_ *cmd, int _U_ parno, const char _U_ *carg, int32_t _U_ iarg){
+static int goodstub(const char *cmd, int parno, const char *carg, int32_t iarg){
+    USB_sendstr("cmd="); USB_sendstr(cmd);
+    USB_sendstr(", parno="); USB_sendstr(i2str(parno));
+    USB_sendstr(", args="); USB_sendstr(carg);
+    USB_sendstr(", intarg="); USB_sendstr(i2str(iarg)); newline();
     return RET_GOOD;
 }
 
@@ -130,8 +134,11 @@ static int tms(const char _U_ *cmd, int _U_ parno, const char _U_ *c, int32_t _U
 
 static int pwm(const char *cmd, int parno, const char *c, int32_t i){
     if(parno < 0 || parno > 3) return RET_WRONGPARNO;
-    if(c) setPWM(parno, (uint8_t)i);
-    sendkeyu(cmd, -1, getPWM(parno));
+    if(c){
+        if(i < 0 || i > PWM_CCR_MAX) return RET_WRONGARG;
+        setPWM(parno, (uint16_t)i);
+    }
+    sendkeyu(cmd, parno, getPWM(parno));
     return RET_GOOD;
 }
 
@@ -146,7 +153,7 @@ commands cmdlist[] = {
     {NULL, "Different commands", NULL},
     {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..255)"},
+    {pwm, "pwm", "set/get x channel (0..3) pwm value (0..100)"},
     {reset, "reset", "reset MCU"},
     {tms, "tms", "print Tms"},
     {NULL, "I2C commands", NULL},
diff --git a/F3:F303/NitrogenFlooding/usbhw.c b/F3:F303/NitrogenFlooding/usbhw.c
index 8d2a880..f98d0ef 100644
--- a/F3:F303/NitrogenFlooding/usbhw.c
+++ b/F3:F303/NitrogenFlooding/usbhw.c
@@ -50,10 +50,10 @@ static uint16_t lastaddr = LASTADDR_DEFAULT;
 int EP_Init(uint8_t number, uint8_t type, uint16_t txsz, uint16_t rxsz, void (*func)(ep_t ep)){
     if(number >= STM32ENDPOINTS) return 4; // out of configured amount
     if(txsz > USB_BTABLE_SIZE || rxsz > USB_BTABLE_SIZE) return 1; // buffer too large
-    if(lastaddr + txsz + rxsz >= USB_BTABLE_SIZE) return 2; // out of btable
+    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;
-    if(rxsz & 1 || rxsz > 512) return 3; // wrong rx buffer size
+    if(rxsz & 1 || rxsz > USB_BTABLE_SIZE) return 3; // wrong rx buffer size
     uint16_t countrx = 0;
     if(rxsz < 64) countrx = rxsz / 2;
     else{
diff --git a/F3:F303/NitrogenFlooding/version.inc b/F3:F303/NitrogenFlooding/version.inc
index 379d92d..1d5ece6 100644
--- a/F3:F303/NitrogenFlooding/version.inc
+++ b/F3:F303/NitrogenFlooding/version.inc
@@ -1,2 +1,2 @@
-#define BUILD_NUMBER "52"
-#define BUILD_DATE "2023-04-10"
+#define BUILD_NUMBER "56"
+#define BUILD_DATE "2023-05-03"