stm32 ADC interrupt - stm32f4discovery

Question

I'm studying ADC programming on STM32 F407 Discovery and starting with the simplest case - single conversion. (connected to ADC1)
I'm using StdPeriph In normal case when I don't using interrupt and do it in while(1) in main() everything is working but when I want to trigger Analog to Digital Converter by interrput value of measurement is set to 0
void ADC_Config(){
//purposly ommited
}
void InitializeTimer_OnehundredthSecond(){
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period =99;
TIM_TimeBaseStructure.TIM_Prescaler = 8399;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_Cmd(TIM4, ENABLE);
}
void TIM4_NVIC_Config(){
NVIC_InitTypeDef NVIC_InitStructure;
// numer przerwania
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
// priorytet główny
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
// subpriorytet
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
// uruchom dany kanał
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// zapisz wypełnioną strukturę do rejestrów
NVIC_Init(&NVIC_InitStructure);
// wyczyszczenie przerwania od timera 4 (wystąpiło przy konfiguracji timera)
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
// zezwolenie na przerwania od przepełnienia dla 4
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
}
int j=0;
int volatile ADC_Result=0;
void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
ADC_SoftwareStartConv(ADC1);
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
}
}
void ADC1_1_IRQHandler(){
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET);
ADC_Result = ADC_GetConversionValue(ADC1);
}
int main(){
ADC_Config();
InitializeTimer_OnehundredthSecond();
TIM4_NVIC_Config();
TIM4_IRQHandler();
ADC1_1_IRQHandler();
while(1){
}
}

Answer 1

I think your ADC interrupt handler is never called.
If you look at your startup file (startup_stm32f407xx.s), you can see that the interrupt handler is:
DCD ADC_IRQHandler ; ADC1, ADC2 and ADC3s
In your code, you have:
void ADC1_1_IRQHandler()
which is never called. So your variable stays at 0.
So rename ADC1_1_IRQHandler into ADC_IRQHandler and that should work.
If this does not save your issue, please share the code for ADC_Config.

Answer 2

Here is working code. I've already solved that problem. Invoking IRQ like I did in main is a bad idea.:/
void InitializeTimer_OnehundredthSecond(){
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_TimeBaseStructure.TIM_Period =99;
TIM_TimeBaseStructure.TIM_Prescaler = 8399;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
}
void TIM4_NVIC_Config(){
NVIC_InitTypeDef NVIC_InitStructure;
// numer przerwania
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
// priorytet główny
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
// subpriorytet
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
// uruchom dany kanał
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// zapisz wypełnioną strukturę do rejestrów
NVIC_Init(&NVIC_InitStructure);
// wyczyszczenie przerwania od timera 4 (wystąpiło przy konfiguracji timera)
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
// zezwolenie na przerwania od przepełnienia dla 4
TIM_ITConfig(TIM4, TIM_IT_Update, ENABLE);
}
int j=0;
int volatile ADC_Result=0;
void TIM4_IRQHandler(void)
{
if(TIM_GetITStatus(TIM4, TIM_IT_Update) != RESET)
{
ADC_SoftwareStartConv(ADC1);
TIM_ClearITPendingBit(TIM4, TIM_IT_Update);
}
}
void ADC1_1_NVIC_Config(){
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = ADC_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
ADC_ClearITPendingBit(ADC1,ADC_IT_EOC);
ADC_ITConfig(ADC1, ADC_IT_EOC, ENABLE);
}
void ADC_IRQHandler(){
if(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) != RESET){
ADC_Result = ADC_GetConversionValue(ADC1);
//ADC_ClearITPendingBit(ADC1,ADC_FLAG_EOC);//<--clear automatically
}
}
int main(){
ADC_Config();
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);
ADC1_1_NVIC_Config();
InitializeTimer_OnehundredthSecond();
TIM4_NVIC_Config();
TIM_Cmd(TIM4, ENABLE);
while(1){
}
}