LED blinky example for STM8 using SDCC compiler

build.bat

@echo off

:: configuration
SET CC=sdcc
SET CFLAGS=-mstm8 
SET INCLUDEPATH=C:/st_toolset/STM8S_StdPeriph_Lib/Libraries/STM8S_StdPeriph_Driver/inc
:: mcu type defined in stm8s.h file
SET DEFINES=STM8S103
SET SOURCE=leds
SET OUTPUT_DIR=build

:test_prerequisites
call %CC% -v || goto :failed
goto :clean

:failed
echo ERROR - SDCC compiler is not installed or not included in system PATH!
goto :exit

:clean
echo INFO - Cleaning up...
rm -Rf %OUTPUT_DIR%
rm -f %SOURCE%.hex
echo INFO - Cleanup complete

:compile
echo INFO - Compiling...
mkdir %OUTPUT_DIR% 
%CC% %CFLAGS% -I%INCLUDEPATH% -D %DEFINES% -o %OUTPUT_DIR%/ %SOURCE%.c || goto :compile_failed
echo INFO - Compile complete
goto :makehex

:compile_failed
echo ERROR - Compilation failure
goto :exit

:makehex
echo INFO - Generating HEX file...
packihx %OUTPUT_DIR%/%SOURCE%.ihx > %SOURCE%.hex
echo INFO - Generate complete

echo INFO - Done. OK

:exit
pause

leds.c

#include "stm8s.h"
#include "stm8s_gpio.h"

volatile void delay(volatile uint32_t t)
{
  while(t--);
}

int main( void )
{
  // data direction PB5 - output
  GPIOB->DDR |= GPIO_PIN_5;
  
  // control register 
  GPIOB->CR1 |= GPIO_PIN_5;
  
  // data output latch register
  GPIOB->ODR |= GPIO_PIN_5;
  
  while(1)            
  {
    delay(20000); 			  // wait approx. 1 second
    GPIOB->ODR ^= GPIO_PIN_5; // turn PB5 LED on/off (toggle state)
  }
}