Ich habe begonnen, Interrupts auf stm32 zu studieren, insbesondere auf dem stm32f4-Discovery-Board. Ich habe dieses Beispiel gefunden, in dem Sie die Taste drücken müssen, um den Interrupt zu starten, und erneut drücken müssen, um ihn zu stoppen.
In dieser Zeile: EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt müssen wir entweder den Interrupt-Modus oder den Event-Modus wählen. Ich habe es in den Event-Modus geändert, aber es scheint nicht zu funktionieren. Also kam ich zu dem Schluss, dass der Handler nur mit Interrupts ausgeführt wird.
Warum verwenden wir dann Events auf stm32, wenn Sie in diesem Fall keinen Code ausführen können?
Hier ist der Code:
#include "stm32f4xx.h"
#include "stm32f4xx_syscfg.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_exti.h"
#include "misc.h"
EXTI_InitTypeDef EXTI_InitStructure;
void EXTILine0_Config(void);
void LEDInit(void);
void ExtInt(void)
{
LEDInit();
/* Configure EXTI Line0 (connected to PA0 pin) in interrupt mode */
EXTILine0_Config();
/* Generate software interrupt: simulate a rising edge applied on EXTI0 line */
EXTI_GenerateSWInterrupt(EXTI_Line0);
while (1)
{
}
}
/**
* @brief Configures LED GPIO.
* @param None
* @retval None
*/
void LEDInit()
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable the GPIO_LED Clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
/* Configure the GPIO_LED pin */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOD, &GPIO_InitStructure);
}
/**
* @brief Configures EXTI Line0 (connected to PA0 pin) in interrupt mode
* @param None
* @retval None
*/
void EXTILine0_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure PA0 pin as input floating */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Connect EXTI Line0 to PA0 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0);
/* Configure EXTI Line0 */
EXTI_InitStructure.EXTI_Line = EXTI_Line0;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI Line0 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/**
* @brief This function handles External line 0 interrupt request.
* @param None
* @retval None
*/
void EXTI0_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line0) != RESET)
{
/* Toggle LED1 */
GPIO_ToggleBits(GPIOD, GPIO_Pin_12);
/* Clear the EXTI line 0 pending bit */
EXTI_ClearITPendingBit(EXTI_Line0);
}
}
/**
* @}
*/
/**
* @}
*/
/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/
int main(void)
{
while(1)
{
}
}
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