/*
  Blue Pill test code
  Blinks onboard led (PC13), external led at PC14 (common anode -> HIGH = led off),
  Outputs binary count on PA0-PA7 (common anode as well)

  polprog

  docs:
  http://libopencm3.org/docs/latest/stm32f1/html/
 */


#define STM32F1

#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>


int main(){
  //setup port C
  rcc_periph_clock_enable(RCC_GPIOC);
  gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
  gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_PUSHPULL, GPIO14);
  
  //setup many pins on port a
  rcc_periph_clock_enable(RCC_GPIOA);
  gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		GPIO_CNF_OUTPUT_PUSHPULL, 0x00FF); //set first 8 pins as out
  

	
  int a = 0;
  while(1){
    gpio_clear(GPIOC, GPIO13);
    gpio_set(GPIOC, GPIO14);
    for(int i = 0; i < 100000; i++) __asm__("nop");
    gpio_set(GPIOC, GPIO13);
    gpio_clear(GPIOC, GPIO14);
    for(int i = 0; i < 100000; i++) __asm__("nop");

    gpio_set(GPIOA, 0x00FF); //all leds off
    gpio_clear(GPIOA, a & 0x00FF); //some leds on
    a++;
    if(a > 255) a = 0;
  }	
}