I'm trying to blink leds on my stm32f4 discovery. Somehow it stuck on delay function. I have changed SysTick interrupt priority to 0 and added IncTick()
, GetTick()
functions. What am I missing?
#include "stm32f4xx.h" // Device header
#include "stm32f4xx_hal.h" // Keil::Device:STM32Cube HAL:Common
int main(){
HAL_Init();
__HAL_RCC_GPIOD_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15;
GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15, GPIO_PIN_SET);
HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
HAL_IncTick();
HAL_GetTick();
HAL_Delay(100);
HAL_GPIO_WritePin(GPIOD, GPIO_PIN_12 | GPIO_PIN_13 | GPIO_PIN_14 | GPIO_PIN_15, GPIO_PIN_RESET);
}
Function HAL_IncTick()
is called from SysTick_Handler()
interrupt, which is usually implemented in stm32f4xx_it.c
. You don't call this function from your code!
void SysTick_Handler(void)
{
HAL_IncTick();
}
The function HAL_Init()
initializes the SysTick timer to a 1ms interval and enables the associated interrupt. So, after calling HAL_Init()
the function HAL_Delay()
should be work properly.
NOTE: The STM32 HAL allows you to override (see keyword __weak
) functions:
HAL_InitTick()
HAL_IncTick()
HAL_GetTick()
HAL_Delay()
So if you want to use the default delay mechanism you should not implement these functions in your code!