UART with STM8S103F3P6 using ST Visual develop IDE

Prerequisites

This project assumes you have already installed ST Visual develop IDE and Cosmic Compiler. You need to have previously done a basic blink sketch with STM8S103F3P6 using STVD. I have made a complete video from installing to LED blink program. You can watch it by clicking this link. https://www.youtube.com/watch?v=iFiBfx9vCqo

Wiring Diagram

Libraries

FROM STM8S/A Standard peripheral library

from https://www.st.com/en/embedded-software/stsw-stm8069.html

stm8s.h

stm8s_clk.h

stm8s_gpio.h

stm8s_uart1.h

stm8s_clk.c

stm8s_gpio.c

stm8s_uart1.c

stm8s_conf.h

main.c code

#include "stm8s.h"

void delay_ms (int ms) // Milli second delay
{
  int a =0 ;
  int b=0;
  for (a=0; a<=ms; a++)
  {
    for (b=0; b<120; b++) 
      _asm("nop"); // Perform no operation 
  }
}

void UART1_Print_String(char *a)
{
    int i;
  for(i=0;a[i]!='\0';i++)
    {
      UART1_SendData8(a[i]);
        while( UART1_GetFlagStatus(UART1_FLAG_TXE) == RESET);
    }
}

// Can send from -99999 to 99999
void UART1_Print_Integer(signed long value)
{
    char ch[7] = {0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x00};
  if(value < 0) // If negative number place "-" sign in front
  {
    ch[0] = 0x2D; 
    value = -value;
  }
  else
  {
    ch[0] = 0x20; // If positive number place space sign in front
  }
  if(value > 9999)
  {
    ch[1] = ((value / 10000) + 0x30); 
    ch[2] = (((value % 10000) / 1000) + 0x30); 
    ch[3] = (((value % 1000) / 100) + 0x30); 
    ch[4] = (((value % 100) / 10) + 0x30); 
    ch[5] = ((value % 10) + 0x30);
  }
  else if((value > 999) && (value <= 9999))
  {
    ch[1] = ((value / 1000) + 0x30); 
    ch[2] = (((value % 1000) / 100) + 0x30); 
    ch[3] = (((value % 100) / 10) + 0x30); 
    ch[4] = ((value % 10) + 0x30);
    ch[5] = 0x20;
  }
  else if((value > 99) && (value <= 999))
  {
    ch[1] = ((value / 100) + 0x30); 
    ch[2] = (((value % 100) / 10) + 0x30); 
    ch[3] = ((value % 10) + 0x30);
    ch[4] = 0x20;
    ch[5] = 0x20;
  }
  else if((value > 9) && (value <= 99))
  {
    ch[1] = ((value / 10) + 0x30); 
    ch[2] = ((value % 10) + 0x30);
    ch[3] = 0x20;
    ch[4] = 0x20;
    ch[5] = 0x20;
  }
  else
  {
    ch[1] = ((value % 10) + 0x30);
    ch[2] = 0x20;
    ch[3] = 0x20;
    ch[4] = 0x20;
    ch[5] = 0x20;
  }
  UART1_Print_String(ch);
}

main()
{
    unsigned char inChar;
    signed long countUART = -250;
    GPIO_Init(GPIOB, GPIO_PIN_5, GPIO_MODE_OUT_PP_LOW_SLOW);
  UART1_DeInit();
    UART1_Init(9600,UART1_WORDLENGTH_8D,UART1_STOPBITS_1,UART1_PARITY_NO,
               UART1_SYNCMODE_CLOCK_DISABLE,UART1_MODE_TXRX_ENABLE);
    UART1_Cmd(ENABLE);
    while (1)
    {
        if (UART1_GetFlagStatus(UART1_FLAG_RXNE) == SET) {
            inChar = UART1_ReceiveData8();
            if (inChar == 'N') GPIO_WriteHigh(GPIOB, GPIO_PIN_5);
            if (inChar == 'Y') GPIO_WriteLow(GPIOB, GPIO_PIN_5);
        }
        UART1_Print_String("The value is : ");
        UART1_Print_Integer(countUART);
        countUART++;
        UART1_Print_String("\n");
        delay_ms(300);
    }
}