Fixed.

Posted on November 15, 2015 at 22:59

Looks like hours of fun, not sure I'm up for digging through register issues with you.

Your IRQ Handler will need to clear the interrupt, with a TIM1->SR = mask otherwise it will never leave the interrupt state.

Posted on November 15, 2015 at 23:47

No problem, I'll get it eventually. It was just on the off chance that someone had experience in the area, one of those things that's easy when you know how, I'm sure. 

Thanks for the tip.

Posted on November 16, 2015 at 02:01

Please don't delete threads, it damages the integrity of the forum.

From: clive1 Posted: Sunday, November 15, 2015 10:59 PM Subject: Fixed.

Looks like hours of fun, not sure I'm up for digging through register issues with you.

Your IRQ Handler will need to clear the interrupt, with a TIM1->SR = mask otherwise it will never leave the interrupt state. From: bush.john Posted: Sunday, November 15, 2015 9:35 PM Subject: Stmf407 pwm input capture problem

Hello all, first post on this forum, somewhat of a total newbie, as im sure will become clear on reading my code :).

I'm currently attempting to learn my way around the stm32f407 discovery board. At the moment I'm trying to figure out the PWM capture. In the code below I have tried to put together a very simple program, to capture some information about pulse width of an incoming signal (using the steps defined in the reference manual) and trigger an interrupt when a sample is received, which dumps any count data to output. Of course, the code runs, but no data timing data is received, and I don't have much of an idea why at this point, though I continue to work at it. I would very muchappreciate any advice offered! cheers.

#include ''stm32f4xx.h''
#include ''stdio.h''
#include ''usart.c''
#define TIM1_EN 0x01
#define PORTC_CLOCK_EN 2
#define PIN5 5
/* 
Goal of project is to sample the high pulse width of a square wave input,
the sample will then be ouputted via UART for confirmation
*/
int placeholder;
void TIM1_CC_IRQHandler(void)
{
placeholder = TIM1->CCR2;
}
int main(void)
{
/*
Setup PORTC PIN5 to capture the pulse width of incomming signal using TIM1 PWM input capture.
On capture, interrupt is triggered and displays contents of TIM1_CCR2 as output via UART
*/
RCC->AHB1ENR |=(1<<
PORTC_CLOCK_EN
); //Enable PORTC clock
RCC->APB2ENR |=(TIM1_EN); //Enable TIM1 clock
GPIOC->AFR[0] |=(1<<
20
); //Assign PORTC Pin5 to TIM1
TIM1->CR1 |=0x01; //Enable count on TIM1
TIM1->CCMR1 |=(0x01); //Set CC1S bits to 01 
TIM1->CCER &=~(0x0A); //Set CC1P and CC1NP bits to 0
TIM1->CCMR1 |=(1<<
9
); //Set CC2S bits to 10
TIM1->CCER |=(0x0A0); //Set CC2P and CC2NP bits to 1
TIM1->SMCR |=(0x54); //Set SMS bits to 100 & TS bits to 101
TIM1->CCER |=(0x011); //Enable captures
TIM1->DIER |=(1<<
1
); //Enable capture compare interrupt 1
NVIC->ISER[0] |=(1<<27); //Enable interrupt for TIM1_CC
config_UART2(); //Enable USART output 
placeholder =0;
while(1)
{
printf(''value recieved %d 
 
'', placeholder);
}
}