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valeh
2020-12-22 14:30:09 +02:00
commit 26b0ba5954
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41
basic-setup/components/u8g2/sys/arm/stm32l011x4/blink/main.c Normal file
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/*
LED blink project for the STM32L011
Assumes LED at Pin 6, GPIO PA0
*/
#include "stm32l011xx.h"
volatile unsigned long SysTickCount = 0;
void __attribute__ ((interrupt, used)) SysTick_Handler(void)
{
SysTickCount++;
if ( SysTickCount & 1 )
GPIOA->BSRR = GPIO_BSRR_BS_0; /* atomic set PA0 */
else
GPIOA->BSRR = GPIO_BSRR_BR_0; /* atomic clr PA0 */
}
int main()
{
RCC->IOPENR |= RCC_IOPENR_IOPAEN; /* Enable clock for GPIO Port A */
__NOP();
__NOP();
GPIOA->MODER &= ~GPIO_MODER_MODE0; /* clear mode for PA0 */
GPIOA->MODER |= GPIO_MODER_MODE0_0; /* Output mode for PA0 */
GPIOA->OTYPER &= ~GPIO_OTYPER_OT_0; /* no Push/Pull for PA0 */
GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED0; /* low speed for PA0 */
GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD0; /* no pullup/pulldown for PA0 */
GPIOA->BSRR = GPIO_BSRR_BR_0; /* atomic clr PA0 */
SysTick->LOAD = 2000*500 - 1;
SysTick->VAL = 0;
SysTick->CTRL = 7; /* enable, generate interrupt (SysTick_Handler), do not divide by 2 */
for(;;)
;
}