#include "stm32c031xx.h"


#define DIO_HIGH() (GPIOA->BSRR = (1 << 0))      
#define DIO_LOW()  (GPIOA->BSRR = (1 << 16)) 
#define CLK_HIGH() (GPIOA->BSRR = (1 << 1))      
#define CLK_LOW()  (GPIOA->BSRR = (1 << 17)) 

void DELAY(uint32_t us) {
    for(volatile uint32_t i = 0; i < us; i++);
}

void START(void) {
  CLK_HIGH();
  DIO_HIGH();
  DELAY(30);
  DIO_LOW();
  DELAY(30);
  CLK_LOW();

}
void STOP(void)
{
CLK_LOW();
DIO_LOW();
DELAY(30);
CLK_HIGH();
DELAY(30);
DIO_HIGH();
DELAY(30);
}
void ACK (void) {
  CLK_LOW();
  DIO_HIGH();
  DELAY(30);
  CLK_HIGH();
  DELAY(30);
  CLK_LOW();
}
void DATA_IN(uint8_t byte) {
  for(int BD = 0; BD < 8; BD++) {
    CLK_LOW();
      DELAY(30);
    if(byte & 0x01) {
      DIO_HIGH();
    }else {
      DIO_LOW();
    }
    DELAY(30);
    CLK_HIGH();
    DELAY(30);
  
    byte >>= 1;
  }

   
   CLK_LOW();
  DIO_HIGH();
  DELAY(30);
  CLK_HIGH();
  DELAY(30);
  CLK_LOW();

}

int main(void) {
  RCC->IOPENR = 1;
  GPIOA->MODER &= ~((3 << 0) | (3 << 2));
  GPIOA->MODER |= (1 << 0) | (1 << 2);
  GPIOA->OTYPER |= (1 << 0) | (1 << 1);
  GPIOA->PUPDR &= ~((3 << 0) | (3 << 2));
  GPIOA->PUPDR |= ((1 << 0) | (1 << 2));
  CLK_HIGH();
  DIO_HIGH();
  DELAY(60);

 
  volatile int SEGR = 0;
  volatile int POSITION = 0;
  volatile uint8_t SEG1 = 0;
  volatile int SEG2 = 0;
  volatile int SEG3 = 0;
  volatile int SEG4 = 0;
  uint8_t NUM[] = {0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07, 0x7F, 0x6F};
  volatile int counter = 0;
  while(1) {
  counter = 0;
  START();
  DATA_IN(0x40);
  STOP();

  START();
  DATA_IN(0xC0);
  DATA_IN(0x00);
  DATA_IN(0x00);
  DATA_IN(0x00);
  DATA_IN(0x00);
  STOP();

  START();
  DATA_IN(0x8F);
  STOP();
  DELAY(100000);
  SEG1 = 0;
  SEG2 = 0;
  SEG3 = 0;
  SEG4 = 0;
while (counter < 4) {
     if(counter == 3) {
      for(volatile int num3 = 1; num3 < 10; num3++){
        SEG4 = NUM[num3];
        for(volatile int num2 = 0; num2 < 10; num2++){
        SEG3 = NUM[num2];
        for(volatile int num1 = 0; num1 < 10; num1++) {
    SEG2 = NUM[num1];
      for(volatile int num = 0; num < 10; num++) {
  SEG1 = NUM[num];
  START();
  DATA_IN(0x40);
  STOP();

  START();
  DATA_IN(0xC0);
  DATA_IN(SEG4);
  DATA_IN(SEG3);
  DATA_IN(SEG2);
  DATA_IN(SEG1);
  STOP();

  START();
  DATA_IN(0x8F);
  STOP();
  DELAY(5000);
  }
    }
      }
      }

    }else if(counter == 2) {
      for(volatile int num2 = 1; num2 < 10; num2++){
        SEG3 = NUM[num2];
        for(volatile int num1 = 0; num1 < 10; num1++) {
    SEG2 = NUM[num1];
      for(volatile int num = 0; num < 10; num++) {
  SEG1 = NUM[num];
  START();
  DATA_IN(0x40);
  STOP();

  START();
  DATA_IN(0xC0);
  DATA_IN(SEG4);
  DATA_IN(SEG3);
  DATA_IN(SEG2);
  DATA_IN(SEG1);
  STOP();

  START();
  DATA_IN(0x8F);
  STOP();
  DELAY(5000);
  }
    }
      }
    } else if(counter == 1) {
  for(volatile int num1 = 1; num1 < 10; num1++){
  SEG2 = NUM[num1];
    for(volatile int num = 0; num < 10; num++) {
  SEG1 = NUM[num];
  START();
  DATA_IN(0x40);
  STOP();

  START();
  DATA_IN(0xC0);
  DATA_IN(SEG4);
  DATA_IN(SEG3);
  DATA_IN(SEG2);
  DATA_IN(SEG1);
  STOP();

  START();
  DATA_IN(0x8F);
  STOP();
  DELAY(5000);
  }
  }
  }else {
      for(volatile int num = 0; num < 10; num++) {
  SEG1 = NUM[num];
  START();
  DATA_IN(0x40);
  STOP();

  START();
  DATA_IN(0xC0);
  DATA_IN(SEG4);
  DATA_IN(SEG3);
  DATA_IN(SEG2);
  DATA_IN(SEG1);
  STOP();

  START();
  DATA_IN(0x8F);
  STOP();
  DELAY(5000);
  }
  }
  counter++;
}
  }
}