STM32F429I Timer Interrupt - c

Question

I try to implement a timer interrupt on a STM32F429I, but I had no success yet.
The Timer runs fine (observed with debugger) but the interrupt function never gets a call. Also the system seems to hang if I activate the interrupt and then call the function GPIO_WriteBit(), at least when I use the debugger and the function gets called, the debugger hangs. Here is the code so far:
#include "stm32f4xx.h"
#include "stm32f4xx_tim.h"
#include "stm32f4xx_gpio.h"
#include "stm32f4xx_rcc.h"
#include "stm32f4xx_syscfg.h"
//****************************************************************************
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
/* pin configuration */
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_25MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_TIM2); // PA6 TIM2_CH1
}
//****************************************************************************
void TIM2_Configuration(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
int i;
/* Enable TIM2 Peripheral clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
TIM_TimeBaseStructure.TIM_Prescaler = 60000;
TIM_TimeBaseStructure.TIM_Period = 1500; //1Hz Interrupt frequency
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_Cmd(TIM2, ENABLE);
// Likely will interrupt initially unless we clear it
for(i=0; i<3; i++)
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
}
//****************************************************************************
void TIM2_IRQHandler(void)
{
if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET)
{
TIM_ClearITPendingBit(TIM2, TIM_IT_Update);
GPIO_ToggleBits(GPIOA, GPIO_Pin_6);
}
}
//****************************************************************************
void NVIC_Configuration(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
//****************************************************************************
int main(void)
{
SystemInit();
if (SysTick_Config(SystemCoreClock / 1000))
{
/* Capture error */
while (1);
}
NVIC_Configuration();
GPIO_Configuration();
TIM2_Configuration();
GPIO_WriteBit(GPIOC, GPIO_Pin_6, Bit_SET);
while(1) {
}
}
//******************************************************************************