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LED at PA0

This commit is contained in:
kraus 2018-10-07 20:19:08 +02:00
parent d272c110d0
commit f973307870
1 changed files with 16 additions and 9 deletions
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25
sys/arm/stm32l011x4/blink/main.c
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@ -1,4 +1,8 @@
/* LED blink project for the STM32L031 */ /*
LED blink project for the STM32L011
Assumes LED at Pin 6, GPIO PA0
*/
#include "stm32l031xx.h" #include "stm32l031xx.h"
@ -7,10 +11,11 @@ volatile unsigned long SysTickCount = 0;
void __attribute__ ((interrupt, used)) SysTick_Handler(void) void __attribute__ ((interrupt, used)) SysTick_Handler(void)
{ {
SysTickCount++; SysTickCount++;
if ( SysTickCount & 1 ) if ( SysTickCount & 1 )
GPIOA->BSRR = GPIO_BSRR_BS_13; /* atomic set PA13 */ GPIOA->BSRR = GPIO_BSRR_BS_0; /* atomic set PA0 */
else else
GPIOA->BSRR = GPIO_BSRR_BR_13; /* atomic clr PA13 */ GPIOA->BSRR = GPIO_BSRR_BR_0; /* atomic clr PA0 */
} }
int main() int main()
@ -18,13 +23,15 @@ int main()
RCC->IOPENR |= RCC_IOPENR_IOPAEN; /* Enable clock for GPIO Port A */ RCC->IOPENR |= RCC_IOPENR_IOPAEN; /* Enable clock for GPIO Port A */
__NOP(); __NOP();
__NOP(); __NOP();
GPIOA->MODER &= ~GPIO_MODER_MODE13; /* clear mode for PA13 */
GPIOA->MODER |= GPIO_MODER_MODE13_0; /* Output mode for PA13 */
GPIOA->OTYPER &= ~GPIO_OTYPER_OT_13; /* no Push/Pull for PA13 */
GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED13; /* low speed for PA13 */
GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD13; /* no pullup/pulldown for PA13 */
GPIOA->BSRR = GPIO_BSRR_BR_13; /* atomic clr PA13 */
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->LOAD = 2000*500 - 1;
SysTick->VAL = 0; SysTick->VAL = 0;
SysTick->CTRL = 7; /* enable, generate interrupt (SysTick_Handler), do not divide by 2 */ SysTick->CTRL = 7; /* enable, generate interrupt (SysTick_Handler), do not divide by 2 */