STM32F4Discovery - Problem with EXTI portC

naquan · ‎2014-01-06

Posted on January 06, 2014 at 11:32

In my test code below the four leds flash (as expected). The EXTI15_10_IRQHandler fires when i bring PA13 to high or to low. However when i bring PC13 to high/low, nothing happens. it took me almost a week on google but not sure what i am doing wrong.

I tried Pin0, Pin1 PortA and PortB, the same problem the EXTI0_IRQHandler and EXTI1_IRQHandler fire in PortA only

Any help is always appreciated!

#include ''stm32f4xx.h''

#include ''stdio.h''

#include ''string.h''

#include ''stm32f4xx_syscfg.h''

char Res=0;

char i=0;

char myFlag=0;

void Delay(uint32_t ms);

void InitGPIO(void);

void InitUSART(void);

void EXTILineC13_Config(void);

void EXTILineA13_Config(void);

void ActiveLed(char Led_Id);

int main(void){

InitGPIO();

EXTILineC13_Config();

EXTILineA13_Config();

while (1){

}

void Delay(uint32_t ms){

uint32_t TimeOut;

TimeOut = 168000*ms;

while (--TimeOut);

}

void EXTILineC13_Config(void){

EXTI_InitTypeDef aEXTI;

NVIC_InitTypeDef aNVIC;

GPIO_InitTypeDef aGPIO;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

aGPIO.GPIO_Mode=GPIO_Mode_IN;

aGPIO.GPIO_PuPd=GPIO_PuPd_NOPULL;

aGPIO.GPIO_Pin=GPIO_Pin_13;

aGPIO.GPIO_Speed=GPIO_Speed_100MHz;

GPIO_Init(GPIOC,&aGPIO);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOC,EXTI_PinSource13);

aEXTI.EXTI_Line=EXTI_Line13;

aEXTI.EXTI_Mode=EXTI_Mode_Interrupt;

aEXTI.EXTI_Trigger=EXTI_Trigger_Rising;

aEXTI.EXTI_LineCmd=ENABLE;

EXTI_Init(&aEXTI);

aNVIC.NVIC_IRQChannel=EXTI15_10_IRQn;

aNVIC.NVIC_IRQChannelPreemptionPriority=0x0F;

aNVIC.NVIC_IRQChannelSubPriority=0x0F;

aNVIC.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&aNVIC);

}

void EXTILineA13_Config(void){

EXTI_InitTypeDef aEXTI;

NVIC_InitTypeDef aNVIC;

GPIO_InitTypeDef aGPIO;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);

aGPIO.GPIO_Mode=GPIO_Mode_IN;

aGPIO.GPIO_PuPd=GPIO_PuPd_NOPULL;

aGPIO.GPIO_Pin=GPIO_Pin_13;

aGPIO.GPIO_Speed=GPIO_Speed_100MHz;

GPIO_Init(GPIOA,&aGPIO);

SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA,EXTI_PinSource13);

aEXTI.EXTI_Line=EXTI_Line13;

aEXTI.EXTI_Mode=EXTI_Mode_Interrupt;

aEXTI.EXTI_Trigger=EXTI_Trigger_Rising;

aEXTI.EXTI_LineCmd=ENABLE;

EXTI_Init(&aEXTI);

aNVIC.NVIC_IRQChannel=EXTI15_10_IRQn;

aNVIC.NVIC_IRQChannelPreemptionPriority=0x0F;

aNVIC.NVIC_IRQChannelSubPriority=0x0F;

aNVIC.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&aNVIC);

}

void InitUSART(void){

USART_InitTypeDef aUSARTInit;

GPIO_InitTypeDef aGPIOInit;

NVIC_InitTypeDef aNVICInit;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA , ENABLE);

aGPIOInit.GPIO_Pin=GPIO_Pin_9|GPIO_Pin_10;

aGPIOInit.GPIO_Speed=GPIO_Speed_100MHz;

aGPIOInit.GPIO_Mode=GPIO_Mode_AF;

aGPIOInit.GPIO_OType=GPIO_OType_PP;

aGPIOInit.GPIO_PuPd=GPIO_PuPd_NOPULL;

GPIO_Init(GPIOA,&aGPIOInit);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1);

GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);

aUSARTInit.USART_BaudRate=2400;

aUSARTInit.USART_Mode=USART_Mode_Tx|USART_Mode_Rx;

aUSARTInit.USART_Parity=USART_Parity_No;

aUSARTInit.USART_StopBits=USART_StopBits_1;

aUSARTInit.USART_WordLength=USART_WordLength_8b;

aUSARTInit.USART_HardwareFlowControl=USART_HardwareFlowControl_None;

USART_Init(USART1,&aUSARTInit);

USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);

USART_Cmd(USART1,ENABLE);

aNVICInit.NVIC_IRQChannel=USART1_IRQn;

aNVICInit.NVIC_IRQChannelPreemptionPriority=0;

aNVICInit.NVIC_IRQChannelSubPriority=3;

aNVICInit.NVIC_IRQChannelCmd=ENABLE;

NVIC_Init(&aNVICInit);

}

void InitGPIO(void){

GPIO_InitTypeDef aGPIORec;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD , ENABLE);

aGPIORec.GPIO_Pin = GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;

aGPIORec.GPIO_Speed = GPIO_Speed_50MHz;

aGPIORec.GPIO_Mode = GPIO_Mode_OUT;

aGPIORec.GPIO_OType = GPIO_OType_PP;

aGPIORec.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_Init(GPIOD, &aGPIORec);

}

void EXTI15_10_IRQHandler(void){

if (EXTI_GetITStatus(EXTI_Line13)!=RESET){

if (myFlag==0) {

ActiveLed(0x0F);

myFlag=1;

Delay(50);

}

else {

myFlag=0;

ActiveLed(0);

Delay(50);

}

EXTI_ClearITPendingBit(EXTI_Line13);

}

int fputc(int c,FILE *f){

USART_SendData(USART1,c);

while (USART_GetFlagStatus(USART1,USART_FLAG_TC)==RESET){}

return 1;

}

void USART1_IRQHandler(void){

if (USART_GetITStatus(USART1,USART_IT_RXNE)!=RESET){

Res=USART_ReceiveData(USART1);

}

void ActiveLed(char Led_Id){

if (Led_Id & 1) GPIO_SetBits(GPIOD, GPIO_Pin_12);

else GPIO_ResetBits(GPIOD, GPIO_Pin_12);

if (Led_Id & 2) GPIO_SetBits(GPIOD, GPIO_Pin_13);

else GPIO_ResetBits(GPIOD, GPIO_Pin_13);

if (Led_Id & 4) GPIO_SetBits(GPIOD, GPIO_Pin_14);

else GPIO_ResetBits(GPIOD, GPIO_Pin_14);

if (Led_Id & 8) GPIO_SetBits(GPIOD, GPIO_Pin_15);

else GPIO_ResetBits(GPIOD, GPIO_Pin_15);

}

/************************END OF FILE****************************/

Tesla DeLorean · ‎2014-01-06

Posted on January 06, 2014 at 11:58

You get to have ONE pin per EXTI Line

ie

PA11 Exti Line 11

PC12 Exti Line 12

PD13 Exti Line 13

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naquan · ‎2014-01-06

Posted on January 07, 2014 at 04:58

Great! it works after disabling EXTILineA13_Config function!

Thanks a lot Clive1!