First working program

master
Mike Szczys 10 years ago
parent db42d4f87c
commit ff3cb68afa
  1. 5
      README.md
  2. 23
      src/main.c

@ -0,0 +1,5 @@
This program illuminates the blue LED on an STM32F0-Discovery board.
(it's actually blinking really really fast)
This is modelled afer the STM32F4 example found here:
http://jeremyherbert.net/get/stm32f4_getting_started

@ -1,4 +1,11 @@
//#include "stm32f0xx_conf.h"
#include "stm32f0xx_conf.h"
void TIM2_IRQHandler(void) {
// flash on update event
if (TIM2->SR & TIM_SR_UIF) GPIOC->ODR ^= (1 << 8);
TIM2->SR = 0x0; // reset the status register
}
int main(void)
{
@ -14,10 +21,20 @@ int main(void)
//#define LED_ORANGE 0
//#define LED_RED 0
RCC->AHBENR |= RCC_AHBENR_IOPCEN; // enable the clock to GPIOC
RCC->AHBENR |= RCC_AHBENR_GPIOCEN; // enable the clock to GPIOC
//(RM0091 lists this as IOPCEN, not GPIOCEN)
RCC->APB1ENR |= RCC_APB1ENR_TIM2EN; // enable TIM2 clock
GPIOC->MODER = (1 << 16);
while(1) GPIOC->ODR ^= (1 << 16);
NVIC->ISER[0] |= 1<< (TIM2_IRQn); // enable the TIM2 IRQ
TIM2->PSC = 0x0; // no prescaler, timer counts up in sync with the peripheral clock
TIM2->DIER |= TIM_DIER_UIE; // enable update interrupt
TIM2->ARR = 0x01; // count to 1 (autoreload value 1)
TIM2->CR1 |= TIM_CR1_ARPE | TIM_CR1_CEN; // autoreload on, counter enabled
TIM2->EGR = 1; // trigger update event to reload timer registers
while(1);
}

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