Posted on May 17, 2011 at 13:30Hello Guys,
I'm trying to get external interrupts working. Since I don't have any hardware yet, I debug my code using HiTop 5.31. The ISR isn't called and the pending bit for the interrupt, generated by software, isn't set. Even setting the pending bit in SFR doesn't call the ISR. The PC isn't changed to 0x0000_0058, which is the vector for EXTI0, when stepping through the code, too.
When calling SystemInit hitop gets stuck waiting for the PLL. According to this I'm not using SystemInit, to be able to test my code. Does not calling SystemInit affect the AFIO clock and because of that the interrupt?
I searched the Forum but didn't find anything similar. Also I checked my code using examples on the forum.
The project is adapted for STM32f103ZE. I'm using the Std Lib.
Code attached.
I hope anyone can help me...
Cheers
}
Quote:
/*********************** Interrupt Handler ********************************/
void EXTI0_IRQHandler(void)
{
GPIO_Write(GPIOD, 0x0001); //set Pin1 PortD
}
/*********************** Main ********************************/
int main (void)
{
uint16_t test = 0;
//SystemInit(); //disabled cause HiTop stucks when waiting for the PLL
GPIO_InitTypeDef GPIO_InitStructure; //create GPIO structure
EXTI_InitTypeDef EXTI_InitStructure; //create EXTI structure
NVIC_InitTypeDef NVIC_InitStructure; //create NVIC structure
GPIO_DeInit(GPIOA); //Deinitialisation of PortA
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_All; //select all pins of PortA
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPD; //set input mode pull down
GPIO_Init(GPIOA, &GPIO_InitStructure); //Write Settings to PortA
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); //use PortA for EXTILine0
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE); //enable AFIO Clock
EXTI_InitStructure.EXTI_Line = EXTI_Line0; //select EXTILine0
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; //select Interrupt-Mode
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; //select Trigger on Rising Edge
EXTI_InitStructure.EXTI_LineCmd = ENABLE; //enable Interrupt on EXTILine0
EXTI_Init(&EXTI_InitStructure); //write Settings to EXTILine0
NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; //select EXTI0 IRQ
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; //set priority
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //set subpriority
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //enable EXTI0 interrup channel
NVIC_Init(&NVIC_InitStructure); //write settings to NVIC
while (1)
{
test++; //increment test variable
if(test==3)
{
EXTI_GenerateSWInterrupt(EXTI_Line0); //generate software interrupt on EXTI_Line0
}
}
