Posted on June 22, 2012 at 08:38In main function when we set or reset PA6, it will land into interrupt, while I have explicitly defined in EXTI9_5_IRQHandler , that only interrupt should happen on PA5 not on PA6. I don't know what is going on Please Help??, I want PA6 as GPIO alone (not on interrupt) and PA5 input as an interrupt, plz see code below
//Code is here::::::
void EXTILine5_Config(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOA clock */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
/* Enable SYSCFG clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
/* Configure PA5 pin as input floating */
/* Connect EXTI Line5 to PA5 pin */
SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource5);
/* Configure EXTI Line0 */
EXTI_InitStructure.EXTI_Line = EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable and set EXTI Line5 Interrupt to the lowest priority */
NVIC_InitStructure.NVIC_IRQChannel =EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void InitGPIOS(void)
{
/* Configure PA6 in output pushpull mode */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure); /// GPIO PA6
/* Configure PA5 in input pushpull mode */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
void main(){
InitGPIOS();
EXTILine5_Config();
while(1)
{
GPIO_WriteBit(GPIOA, GPIO_Pin_6,Bit_SET);
Delay(100);
GPIO_WriteBit(GPIOA, GPIO_Pin_6,Bit_RESET);
Delay(100);
}
}
// GPIO Interrupt
void EXTI9_5_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line5) != RESET)
{
STM_EVAL_LEDToggle(LED4);
EXTI_ClearITPendingBit(EXTI_Line5);
}
}
Thanks in advance
#exti-interrupt-error
