From abdbac3e380a7ffc9589cc63dcd5ea51e235d2ec Mon Sep 17 00:00:00 2001
From: eddyem <eddyem@yandex.ru>
Date: Wed, 7 Aug 2019 17:16:14 +0300
Subject: [PATCH] fixed bug with systick correction

---
 F1-nolib/chronometer/GPS.c      |   2 +
 F1-nolib/chronometer/Readme.md  |  18 +++--
 F1-nolib/chronometer/chrono.bin | Bin 15396 -> 15396 bytes
 F1-nolib/chronometer/hardware.c |  18 +++--
 F1-nolib/chronometer/hardware.h |  13 +++-
 F1-nolib/chronometer/lidar.c    |   1 +
 F1-nolib/chronometer/main.c     |  92 ++++++++++++++++++++-----
 F1-nolib/chronometer/str.c      |  18 ++++-
 F1-nolib/chronometer/str.h      |   1 +
 F1-nolib/chronometer/time.c     | 118 +++++++++++++++-----------------
 10 files changed, 188 insertions(+), 93 deletions(-)

diff --git a/F1-nolib/chronometer/GPS.c b/F1-nolib/chronometer/GPS.c
index b3f44a7..1080c11 100644
--- a/F1-nolib/chronometer/GPS.c
+++ b/F1-nolib/chronometer/GPS.c
@@ -182,6 +182,8 @@ void GPS_parse_answer(const char *buf){
         GPS_status = GPS_VALID;
         set_time(buf);
     }else{
+        uint8_t goth = (buf[0]-'0')*10 + buf[1]-'0';
+        if(current_time.H != goth) set_time(buf); // set time once per hour even if it's not valid
         GPS_status = GPS_NOT_VALID;
     }
 }
diff --git a/F1-nolib/chronometer/Readme.md b/F1-nolib/chronometer/Readme.md
index 545d295..e85cb05 100644
--- a/F1-nolib/chronometer/Readme.md
+++ b/F1-nolib/chronometer/Readme.md
@@ -3,18 +3,24 @@ Chronometer for downhill competitions
 
 ## Pinout
 
+- PA11/12 - USB
 - PA9(Tx),PA10 (debug mode) - USART1 - debug console
 - PA2(Tx), PA3 - USART2 - GPS
-- PB10(Tx), PB11 - USART3 - LIDAR
+- PB10(Tx), PB11 - USART3 - LIDAR - TRIG3
 
 - PA1  - PPS signal from GPS (EXTI)
 
-- PB8, PB9 - onboard LEDs
-
-- PA4  - TRIG2 - 12V trigger (EXTI)  -- not implemented yet
+- PA4  - TRIG2 - 12V trigger (EXTI)
 - PA13 - TRIG0 - button0 (EXTI)
 - PA14 - TRIG1 - button1/laser/etc (EXTI)
 - PA15 - USB pullup
 
-- PB0 - ADC channel 8
-- PB1,2 - free for other functions
+- PB8, PB9 - onboard LEDs (0/1)
+
+- PC13 - buzzer
+
+### Not implemented yet:
+
+- PA5,6,7 (SCK, MISO, MOSI) - SPI
+- PB0 - TRIG4 - ADC channel 8
+- PB6/7 (SCL, SDA) - I2C
diff --git a/F1-nolib/chronometer/chrono.bin b/F1-nolib/chronometer/chrono.bin
index 8b0451a1d40d214122481f2d2a5698c9fac52bdb..e543be800cc1094e5a33ec1d2b62540921823acd 100755
GIT binary patch
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diff --git a/F1-nolib/chronometer/hardware.c b/F1-nolib/chronometer/hardware.c
index 7aceba0..0fd3bf9 100644
--- a/F1-nolib/chronometer/hardware.c
+++ b/F1-nolib/chronometer/hardware.c
@@ -29,6 +29,7 @@
 
 #include <string.h> // memcpy
 
+uint8_t buzzer_on = 1; // buzzer ON by default
 uint8_t LEDSon = 1; // LEDS are working
 // ports of triggers
 static GPIO_TypeDef *trigport[DIGTRIG_AMOUNT] = {GPIOA, GPIOA, GPIOA};
@@ -42,14 +43,22 @@ trigtime shottime[TRIGGERS_AMOUNT];
 static uint32_t shotms[TRIGGERS_AMOUNT];
 // if trigger[N] shots, the bit N will be 1
 uint8_t trigger_shot = 0;
+// time when Buzzer was turned ON
+uint32_t BuzzerTime = 0;
 
 static inline void gpio_setup(){
+    BUZZER_OFF(); // turn off buzzer @start
+    LED_on(); // turn ON LED0 @start
+    LED1_off(); // turn off LED1 @start
+    USBPU_OFF(); // turn off USB pullup @start
     // Enable clocks to the GPIO subsystems (PB for ADC), turn on AFIO clocking to disable SWD/JTAG
     RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
     // turn off SWJ/JTAG
     AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
     // pullups: PA1 - PPS, PA15 - USB pullup
     GPIOA->ODR = (1<<12)|(1<<15);
+    // buzzer (PC13): pushpull output
+    GPIOC->CRH = CRH(13, CNF_PPOUTPUT|MODE_SLOW);
     // Set leds (PB8) as opendrain output
     GPIOB->CRH = CRH(8, CNF_ODOUTPUT|MODE_SLOW) | CRH(9, CNF_ODOUTPUT|MODE_SLOW);
     // PPS pin (PA1) - input with weak pullup
@@ -128,7 +137,7 @@ void hw_setup(){
 
 void exti1_isr(){ // PPS - PA1
     systick_correction();
-    DBG("exti1");
+    LED_off(); // turn off LED0 @ each PPS
     EXTI->PR = EXTI_PR_PR1;
 }
 
@@ -140,17 +149,18 @@ void savetrigtime(){
 
 void fillshotms(int i){
     if(i < 0 || i > TRIGGERS_AMOUNT) return;
-    if(shotms[i] - Tms > (uint32_t)the_conf.trigpause[i]){
+    if(Tms - shotms[i] > (uint32_t)the_conf.trigpause[i]){
         shotms[i] = Tms;
         memcpy(&shottime[i], &trgtm, sizeof(trigtime));
         trigger_shot |= 1<<i;
+        BuzzerTime = Tms;
+        BUZZER_ON();
     }
 }
 
 void exti4_isr(){ // PA4 - trigger[2]
     savetrigtime();
     fillshotms(2);
-    DBG("exti4");
     EXTI->PR = EXTI_PR_PR4;
 }
 
@@ -158,12 +168,10 @@ void exti15_10_isr(){ // PA13 - trigger[0], PA14 - trigger[1]
     savetrigtime();
     if(EXTI->PR & EXTI_PR_PR13){
         fillshotms(0);
-        DBG("exti13");
         EXTI->PR = EXTI_PR_PR13;
     }
     if(EXTI->PR & EXTI_PR_PR14){
         fillshotms(1);
-        DBG("exti14");
         EXTI->PR = EXTI_PR_PR14;
     }
 }
diff --git a/F1-nolib/chronometer/hardware.h b/F1-nolib/chronometer/hardware.h
index 869f327..a746279 100644
--- a/F1-nolib/chronometer/hardware.h
+++ b/F1-nolib/chronometer/hardware.h
@@ -33,6 +33,13 @@
 #define LED1_port   GPIOB
 #define LED1_pin    (1<<9)
 
+// buzzer (1 - active) - PC13
+extern uint8_t buzzer_on;
+#define BUZZER_port GPIOC
+#define BUZZER_pin  (1<<13)
+#define BUZZER_ON() do{if(buzzer_on)pin_set(BUZZER_port, BUZZER_pin);}while(0)
+#define BUZZER_OFF() pin_clear(BUZZER_port, BUZZER_pin)
+
 // PPS pin - PA1
 #define PPS_port    GPIOA
 #define PPS_pin     (1<<1)
@@ -56,10 +63,10 @@ void savetrigtime();
 
 #define LED_blink()    do{if(LEDSon)pin_toggle(LED0_port, LED0_pin);}while(0)
 #define LED_on()       do{if(LEDSon)pin_clear(LED0_port, LED0_pin);}while(0)
-#define LED_off()      do{if(LEDSon)pin_set(LED0_port, LED0_pin);}while(0)
+#define LED_off()      do{pin_set(LED0_port, LED0_pin);}while(0)
 #define LED1_blink()   do{if(LEDSon)pin_toggle(LED1_port, LED1_pin);}while(0)
 #define LED1_on()      do{if(LEDSon)pin_clear(LED1_port, LED1_pin);}while(0)
-#define LED1_off()     do{if(LEDSon)pin_set(LED1_port, LED1_pin);}while(0)
+#define LED1_off()     do{pin_set(LED1_port, LED1_pin);}while(0)
 
 // GPS USART == USART2, LIDAR USART == USART3
 #define GPS_USART   (2)
@@ -76,6 +83,8 @@ extern uint8_t LEDSon;
 extern trigtime shottime[TRIGGERS_AMOUNT];
 // if trigger[N] shots, the bit N will be 1
 extern uint8_t trigger_shot;
+// time when Buzzer was turned ON
+extern uint32_t BuzzerTime;
 
 void hw_setup();
 
diff --git a/F1-nolib/chronometer/lidar.c b/F1-nolib/chronometer/lidar.c
index dc363c6..ae37189 100644
--- a/F1-nolib/chronometer/lidar.c
+++ b/F1-nolib/chronometer/lidar.c
@@ -33,6 +33,7 @@ void parse_lidar_data(char *txt){
         lidar_triggered_dist = last_lidar_dist;
         return;
     }
+    IWDG->KR = IWDG_REFRESH;
     if(triggered){ // check if body gone
         if(last_lidar_dist < the_conf.dist_min || last_lidar_dist > the_conf.dist_max || last_lidar_dist > lidar_triggered_dist + LIDAR_DIST_THRES){
             triggered = 0;
diff --git a/F1-nolib/chronometer/main.c b/F1-nolib/chronometer/main.c
index 7723301..66c8916 100644
--- a/F1-nolib/chronometer/main.c
+++ b/F1-nolib/chronometer/main.c
@@ -74,10 +74,10 @@ char *parse_cmd(char *buf){
     static char btns[] = "BTN0=0, BTN1=0, BTN2=0, PPS=0\n";
     switch(*buf){
         case '0':
-            LED_off();
+            LED_off(); // LED0 off @dbg
         break;
         case '1':
-            LED_on();
+            LED_on(); // LED0 on @dbg
         break;
         case 'b':
             btns[5] = gettrig(0) + '0';
@@ -179,12 +179,23 @@ static char *get_USB(){
     return NULL;
 }
 
-/*
 void linecoding_handler(usb_LineCoding __attribute__((unused)) *lc){ // get/set line coding
-    DBG("linecoding_handler");
-}*/
+#ifdef EBUG
+    SEND("Change speed to");
+    printu(1, lc->dwDTERate);
+    newline();
+#endif
+}
 
 void clstate_handler(uint16_t __attribute__((unused)) val){ // lesser bits of val: RTS|DTR
+    static uint32_t Tlast = 0;
+    SEND("Tms/Tlast: ");
+    printu(1, Tms);
+    newline();
+    printu(1, Tlast);
+    newline();
+    if(Tms - Tlast < 500) return;
+    Tlast = Tms;
     USB_send("Chronometer version " VERSION ".\n");
 #ifdef EBUG
     if(val & 2){
@@ -198,17 +209,19 @@ void clstate_handler(uint16_t __attribute__((unused)) val){ // lesser bits of va
 #endif
 }
 
-/*
 void break_handler(){ // client disconnected
-    DBG("break_handler");
-}*/
+    DBG("Disconnected");
+}
+
+#ifdef EBUG
+extern int32_t ticksdiff, timecntr, timerval, Tms1;
+extern uint32_t last_corr_time;
+#endif
 
 int main(void){
     uint32_t lastT = 0;
     sysreset();
     StartHSE();
-    LED1_off();
-    USBPU_OFF();
     SysTick_Config(SYSTICK_DEFCONF); // function SysTick_Config decrements argument!
     // read data stored in flash
     get_userconf();
@@ -218,7 +231,7 @@ int main(void){
     USBPU_ON();
     usarts_setup();
 #ifdef EBUG
-    SEND("Chronometer version " VERSION ".\n");
+    SEND("This is chronometer version " VERSION ".\n");
     if(RCC->CSR & RCC_CSR_IWDGRSTF){ // watchdog reset occured
         SEND("WDGRESET=1\n");
     }
@@ -227,16 +240,28 @@ int main(void){
     }
 #endif
     RCC->CSR |= RCC_CSR_RMVF; // remove reset flags
-    iwdg_setup();
-
+    //iwdg_setup();
 
     while (1){
         IWDG->KR = IWDG_REFRESH; // refresh watchdog
+        if(Timer > 499) LED_on(); // turn ON LED0 over 0.25s after PPS pulse
+        if(BuzzerTime && Tms - BuzzerTime > 249){
+            BUZZER_OFF();
+            BuzzerTime = 0;
+        }
         if(lastT > Tms || Tms - lastT > 499){
             if(need2startseq) GPS_send_start_seq();
-            LED_blink();
-            if(GPS_status != GPS_VALID) LED1_blink();
-            else LED1_on();
+            IWDG->KR = IWDG_REFRESH;
+            switch(GPS_status){
+                case GPS_VALID:
+                    LED1_blink(); // blink LED1 @ VALID time
+                break;
+                case GPS_NOT_VALID:
+                    LED1_on(); // shine LED1 @ NON-VALID time
+                break;
+                default:
+                    LED1_off(); // turn off LED1 if GPS not found or time unknown
+            }
             lastT = Tms;
             if(usartrx(LIDAR_USART)){
                 char *txt;
@@ -245,14 +270,42 @@ int main(void){
                     DBG(txt);
                 }
             }
+            IWDG->KR = IWDG_REFRESH;
 #if defined EBUG || defined USART1PROXY
             transmit_tbuf(1); // non-blocking transmission of data from UART buffer every 0.5s
 #endif
             transmit_tbuf(GPS_USART);
             transmit_tbuf(LIDAR_USART);
+#ifdef EBUG
+            static uint8_t x = 1;
+            if(timecntr){
+                if(x){
+                    SEND("ticksdiff=");
+                    if(ticksdiff < 0){
+                        SEND("-");
+                        printu(1, -ticksdiff);
+                    }else printu(1, ticksdiff);
+                    SEND(", timecntr=");
+                    printu(1, timecntr);
+                    SEND("\nlast_corr_time=");
+                    printu(1, last_corr_time);
+                    SEND(", Tms=");
+                    printu(1, Tms1);
+                    SEND("\nTimer=");
+                    printu(1, timerval);
+                    SEND(", LOAD=");
+                    printu(1, SysTick->LOAD);
+                    newline();
+                }
+                x = !x;
+            }
+#endif
         }
+        IWDG->KR = IWDG_REFRESH;
         if(trigger_shot) show_trigger_shot(trigger_shot);
+        IWDG->KR = IWDG_REFRESH;
         usb_proc();
+        IWDG->KR = IWDG_REFRESH;
         int r = 0;
         char *txt;
         if((txt = get_USB())){
@@ -260,6 +313,7 @@ int main(void){
             DBG(txt);
             if(parse_USBCMD(txt))
                 USB_send(txt); // echo back non-commands data
+            IWDG->KR = IWDG_REFRESH;
         }
 #if defined EBUG || defined USART1PROXY
         if(usartrx(1)){ // usart1 received data, store in in buffer
@@ -268,18 +322,23 @@ int main(void){
                 txt[r] = 0;
 #ifdef EBUG
                 char *ans = parse_cmd(txt);
+                IWDG->KR = IWDG_REFRESH;
                 if(ans){
                     transmit_tbuf(1);
+                    IWDG->KR = IWDG_REFRESH;
                     usart_send(1, ans);
                     transmit_tbuf(1);
+                    IWDG->KR = IWDG_REFRESH;
                 }
 #else // USART1PROXY - send received data to GPS
                 usart_send(GPS_USART, txt);
+                IWDG->KR = IWDG_REFRESH;
 #endif
             }
         }
 #endif
         if(usartrx(GPS_USART)){
+            IWDG->KR = IWDG_REFRESH;
             r = usart_getline(GPS_USART, &txt);
             if(r){
                 txt[r] = 0;
@@ -287,6 +346,7 @@ int main(void){
             }
         }
         if(usartrx(LIDAR_USART)){
+            IWDG->KR = IWDG_REFRESH;
             r = usart_getline(LIDAR_USART, &txt);
             if(r){
                 parse_lidar_data(txt);
diff --git a/F1-nolib/chronometer/str.c b/F1-nolib/chronometer/str.c
index d48ce5e..a51e7b0 100644
--- a/F1-nolib/chronometer/str.c
+++ b/F1-nolib/chronometer/str.c
@@ -106,6 +106,7 @@ int parse_USBCMD(char *cmd){
                  CMD_ADCMAX    " - max ADC value treshold for trigger\n"
                  CMD_ADCMIN    " - min -//- (triggered when ADval>min & <max\n"
                  CMD_GETADCVAL " - get ADC value\n"
+                 CMD_BUZZER    "S - turn buzzer ON/OFF\n"
                  CMD_DISTMIN   " - min distance threshold (cm)\n"
                  CMD_DISTMAX   " - max distance threshold (cm)\n"
                  CMD_GPSRESTART " - send Full Cold Restart to GPS\n"
@@ -227,8 +228,8 @@ int parse_USBCMD(char *cmd){
             LEDSon = 1;
             USB_send("ON\n");
         }else{
-            LED_off();
-            LED1_off();
+            LED_off();  // turn off LEDS
+            LED1_off(); // by user request
             LEDSon = 0;
             USB_send("OFF\n");
         }
@@ -251,6 +252,19 @@ int parse_USBCMD(char *cmd){
     }else if(CMP(cmd, CMD_GPSRESTART) == 0){
         USB_send("Send full cold restart to GPS\n");
         GPS_send_FullColdStart();
+    }else if(CMP(cmd, CMD_BUZZER) == 0){
+        uint8_t Nt = cmd[sizeof(CMD_BUZZER) - 1] - '0';
+        if(Nt > 1) goto bad_number;
+        USB_send("BUZZER=");
+        if(Nt){
+            BuzzerTime = 0;
+            buzzer_on = 1;
+            USB_send("ON\n");
+        }else{
+            BuzzerTime = 0;
+            buzzer_on = 0;
+            USB_send("OFF\n");
+        }
     }else return 1;
     IWDG->KR = IWDG_REFRESH;
     if(succeed) USB_send("Success!\n");
diff --git a/F1-nolib/chronometer/str.h b/F1-nolib/chronometer/str.h
index a577328..399c415 100644
--- a/F1-nolib/chronometer/str.h
+++ b/F1-nolib/chronometer/str.h
@@ -41,6 +41,7 @@
 #define CMD_GETADCVAL   "adcval"
 #define CMD_LEDS        "leds"
 #define CMD_GPSRESTART  "gpsrestart"
+#define CMD_BUZZER      "buzzer"
 
 extern uint8_t showGPSstr;
 
diff --git a/F1-nolib/chronometer/time.c b/F1-nolib/chronometer/time.c
index 1eef0c3..cd23253 100644
--- a/F1-nolib/chronometer/time.c
+++ b/F1-nolib/chronometer/time.c
@@ -27,9 +27,6 @@
 volatile uint32_t Timer; // milliseconds counter
 curtime current_time = TMNOTINI;
 
-// ms counter in last correction by PPS
-static uint32_t last_corr_time = 0;
-
 static inline uint8_t atou(const char *b){
     return (b[0]-'0')*10 + b[1]-'0';
 }
@@ -39,11 +36,16 @@ static inline uint8_t atou(const char *b){
  * @param buf - buffer with time data (HHMMSS)
  */
 void set_time(const char *buf){
-    uint8_t H = atou(buf) + TIMEZONE_GMT_PLUS;
+    uint8_t H = atou(buf);// + TIMEZONE_GMT_PLUS;
     if(H > 23) H -= 24;
     current_time.H = H;
     current_time.M = atou(&buf[2]);
     current_time.S = atou(&buf[4]);
+#ifdef EBUG
+    SEND("set_time, Tms: "); printu(1, Tms);
+    SEND("; Timer: "); printu(1, Timer);
+    newline();
+#endif
 }
 
 /**
@@ -66,6 +68,17 @@ void time_increment(){
 #endif
 }
 
+static char *puttwo(uint8_t N, char *buf){
+    if(N < 10){
+        *buf++ = '0';
+    }else{
+        *buf++ = N/10 + '0';
+        N %= 10;
+    }
+    *buf++ = N + '0';
+    return buf;
+}
+
 /**
  * print time: Tm - time structure, T - milliseconds
  */
@@ -92,14 +105,11 @@ char *get_time(curtime *Tm, uint32_t T){
         T %= 10;
     }else *bptr++ = '0';
     *bptr++ = T + '0';
-    if(GPS_status == GPS_NOT_VALID){
-        strcpy(bptr, " (not valid)");
-        bptr += 12;
-    }
-    if(Tms - last_corr_time > 1000){
-        strcpy(bptr, " need PPS sync");
-        bptr += 14;
-    }
+    // put current time in HH:MM:SS format into buf
+    *bptr++ = ' '; *bptr++ = '(';
+    bptr = puttwo(Tm->H, bptr); *bptr++ = ':';
+    bptr = puttwo(Tm->M, bptr); *bptr++ = ':';
+    bptr = puttwo(Tm->S, bptr); *bptr++ = ')';
     if(GPS_status == GPS_NOTFOUND){
         strcpy(bptr, " GPS not found");
         bptr += 14;
@@ -109,6 +119,13 @@ char *get_time(curtime *Tm, uint32_t T){
     return bstart;
 }
 
+
+#ifdef EBUG
+int32_t ticksdiff=0, timecntr=0, timerval, Tms1;
+#endif
+
+uint32_t last_corr_time = 0;
+
 /**
  * @brief systick_correction
  * Makes correction of system timer
@@ -126,61 +143,38 @@ char *get_time(curtime *Tm, uint32_t T){
  */
 void systick_correction(){
     SysTick->CTRL &= ~SysTick_CTRL_ENABLE_Msk; // stop systick for a while
-    int32_t systick_val = SysTick->VAL, L = SysTick->LOAD + 1, timer_val = Timer;
+    uint32_t systick_val = SysTick->VAL, L = SysTick->LOAD + 1;
+    int32_t timer_val = Timer;
+    timerval = Timer;
+    Tms1 = Tms;
+    Timer = 0;
     SysTick->VAL = SysTick->LOAD;
     SysTick->CTRL |= SysTick_CTRL_ENABLE_Msk; // start it again
-    Timer = 0;
-    if(Tms - last_corr_time < 2000){ // calculate corrections only if Timer was zeroed last time
-        if(timer_val < 500) timer_val += 1000; // timer already incremented in SysTick interrupt
-        else time_increment(); // counter less than 1000 -> need to increment time
-        int32_t D = L * (timer_val - 999) - systick_val;
-        D /= 1000;
+//    if(systick_val != SysTick->LOAD) ++Tms;
+    if(timer_val > 500) time_increment(); // counter greater than 500 -> need to increment time
+    if(last_corr_time){
+        if(Tms - last_corr_time < 1500){ // there was perevious PPS signal
+            int32_t D = L * (Tms - 1000 - last_corr_time) + (SysTick->LOAD - systick_val); // amount of spare ticks
+            ++timecntr;
+            ticksdiff += D;
+            uint32_t ticksabs = (ticksdiff < 0) ? -ticksdiff : ticksdiff;
+            // 10000 == 30 seconds * 1000 interrupts per second
+            if(ticksabs > 30000 && timecntr > 30){ // need correction (not more often than each 10s)
+                ticksdiff /= timecntr * 1000; // correction per one interrupt
+                SysTick->LOAD += ticksdiff;
+                timecntr = 0;
+                ticksdiff = 0;
+                last_corr_time = 0;
 #ifdef EBUG
-        SEND("Delta: "); if(D < 0){usart_putchar(1, '-'); printu(1, -D);} else printu(1, D); newline();
-        SEND(get_time(&current_time, 0));
+                SEND("Correction\n");
 #endif
-        SysTick->LOAD += D;
+            }
+        }else{
+            timecntr = 0;
+            ticksdiff = 0;
+            last_corr_time = 0;
+        }
     }
     last_corr_time = Tms;
-#if 0
-    uint32_t t = 0, ticks;
-    static uint32_t ticksavr = 0, N = 0, last_corr_time = 0;
-    // correct
-    int32_t systick_val = SysTick->VAL;
-    // SysTick->LOAD values for all milliseconds (RVR0) and last millisecond (RVR1)
-    SysTick->VAL = RVR0;
-    int32_t timer_val = Timer;
-    Timer = 0;
-    // RVR -> SysTick->LOAD
-    systick_val = SysTick->LOAD + 1 - systick_val; // Systick counts down!
-    if(timer_val < 10) timer_val += 1000; // our closks go faster than real
-    else if(timer_val < 990){ // something wrong
-        RVR0 = RVR1 = SYSTICK_DEFLOAD;
-        SysTick->LOAD = RVR0;
-        need_sync = 1;
-        goto theend;
-    }else
-        time_increment(); // ms counter less than 1000 - we need to increment time
-    t = current_time.H * 3600 + current_time.M * 60 + current_time.S;
-    if(t - last_corr_time == 1){ // PPS interval == 1s
-        ticks = systick_val + (timer_val-1)*(RVR0 + 1) + RVR1 + 1;
-        ++N;
-        ticksavr += ticks;
-        if(N > 20){
-            ticks = ticksavr / N;
-            RVR0 = ticks / 1000 - 1; // main RVR value
-            SysTick->LOAD = RVR0;
-            RVR1 = RVR0 + ticks % 1000; // last millisecond RVR value (with fine correction)
-            N = 0;
-            ticksavr = 0;
-            need_sync = 0;
-        }
-    }else{
-        N = 0;
-        ticksavr = 0;
-    }
-theend:
-    last_corr_time = t;
-#endif
 }