hwa/st/stm32/examples/01-2-blink/main.c

Blink a LED using a software loop

This is a variation of the 01-1-blink program using the hwa() instructions.

Symbols:

• BOARD_H is the name of the target board definition file. It can be specified at compile time via the command line. If not, the Makefile will set it to a default value. For example, make BOARD=mini-stm32-v3.0 will lead to BOARD_H defined as <boards/mini-stm32-v3.0.h>. See STM32 Development boards for the list of board definition files provided.
• PIN_LED1 is the name of the I/O pin at which LED1 is connected. It is defined in the target board header file.
• PERIOD is the blinking period.
• HW_DEVICE_HSIHZ is the CPU frequency.

main.c

 
/*  This file is part of the HWA project.
 *  Copyright (c) 2017 Christophe Duparquet.
 *  All rights reserved. Read LICENSE.TXT for details.
 */
 
#include BOARD_H
 
#define PERIOD          0.5
 
 
int main ( )
{
  hwa( begin, reset );
 
  hwa( power, (LED,port), on );
 
  hwa( configure, LED,
       mode,      digital_output,
       frequency, lowest );
 
  hwa( commit );
 
  for(;;) {
    hwa( write, LED, 1 );
    hwa( commit );
 
    hw_waste_cycles( PERIOD/2 * HW_DEVICE_HSIHZ );
 
    hwa( write, LED, 0 );
    hwa( commit );
 
    hw_waste_cycles( PERIOD/2 * HW_DEVICE_HSIHZ );
  }
}