Input capture problem, using Hall sensors?

[DCiko.1]

Hi,

I am using STM32f407 and I'm trying to measure angle of rotor using Hall sensors. GPIO is initialized as AF fot TIM4, and three channels in input capure mode.

Interrupt is triggered by every edge, falling or rising for each of 3 channels.

Problem is that when I try to read is it input in high or low state in interrupt, I get always high state, and interrupt is never triggered by channel_3.

I am new into this and any help is great.

Thanks a lot.

/* INICIJALIZACIJA TIMERA ZA HALL SENZORE */
 
#include <HALL_timer_config.h>
#include <stm32f4_discovery.h>
 
 
void timer4_init(void){
 
GPIO_InitTypeDef 		GPIO_InitStruct;		
TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;
TIM_ICInitTypeDef 		TIM_ICInitStructure;
NVIC_InitTypeDef 	        NVIC_InitStructure;
	
// enable pin clock, GPIOB pin 6,7,8 za timer4
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);	 
 
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_TIM4); 	
// Connect TIM4 pin (PB6) to AF2 
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4); 									// Connect TIM4 pin (PB7) to AF2 
GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_TIM4); 									// Connect TIM4 pin (PB8) to AF2 
		
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7 | GPIO_Pin_8 ;// HALL1 / HALL2 / HALL3
GPIO_InitStruct.GPIO_Mode 	= GPIO_Mode_AF;// ALTERNATE FUNCTION FOR TIIMER
GPIO_InitStruct.GPIO_Speed 	= GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType 	= GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd 	= GPIO_PuPd_NOPULL;	
GPIO_Init(GPIOB, &GPIO_InitStruct);// postavljanje odabranih pinova
		
// enable timer clock, TIMER4 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
	
// inicijalizacija timer4 time base strukture
TIM_TimeBaseStructure.TIM_Prescaler = 839; 	// 42MHz/50kHz - 1		TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; 							
TIM_TimeBaseStructure.TIM_Period = 65535; 
TIM_TimeBaseStructure.TIM_ClockDivision = 0; 
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0; 
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); 
	
// enable hall sensor interface
// T1F_ED (edge detector) will be connected to  HallSensor Inputs 		
// - T1F_ED je prikljucen na ulaz i detektira promjenu brida
// TIM4_CH1,TIM4_CH2,TIM4_CH3 
// Enables or disables the TIMx's Hall sensor interface.
TIM_SelectHallSensor(TIM4, ENABLE);   																		
		
// HallSensor event is delivered with singnal TI1F_ED - promjena stanja registra
// odnosno pojava rastuceg ili padajuceg brida
// (this is XOR of the three hall sensor lines)
// Signal TI1F_ED: falling and rising ddge of the inputs is used 
TIM_SelectInputTrigger(TIM4, TIM_TS_TI1F_ED); 
		
// On every TI1F_ED event the counter is resetted and update is tiggered 
// The slave mode controller is configured in reset mode; the slave input is TI1F_ED. Thus, 
 // each time one of the 3 inputs toggles, the counter restarts counting from 0. This creates a
 // time base triggered by any change on the Hall inputs.
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);
		
// Channel_123 in input capture mode
// When an input capture occurs:
// The TIMx_CCR1 register gets the value of the counter on the active transition.
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; 
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge; 							
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;									// listen to T1F, the  HallSensorEvent 
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;										 		// Div:1, capture is done every edge 
TIM_ICInitStructure.TIM_ICFilter = 0xF; 																		// noise filter: 1111 
		
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; 
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;									// listen to T1F, the  HallSensorEvent 
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;										 		// Div:1, capture is done every edge 
TIM_ICInitStructure.TIM_ICFilter = 0xF; 																		// noise filter: 1111 
		
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3; 
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_BothEdge; 	
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;									// listen to T1F, the  HallSensorEvent 
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;										 		// Div:1, capture is done every edge 
TIM_ICInitStructure.TIM_ICFilter = 0xF; 																		// noise filter: 1111 
		
TIM_ICInit(TIM4, &TIM_ICInitStructure);
		
		
// enable the interrupt for timer4
// TIM capture compare 1 interrupt source
TIM_ITConfig(TIM4, TIM_IT_CC1|TIM_IT_CC2|TIM_IT_CC3, ENABLE); 							
		
		
// interrupt configuration
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
		
TIM_Cmd(TIM4, ENABLE);
}
 
 
double theta;
double theta_p = 0;
double w;
 
void TIM4_IRQHandler(void) {  
		
volatile double time = TIM4->CNT;
unsigned int HALL1 = GPIO_ReadInputDataBit( GPIOB, GPIO_Pin_6);						// cita inpute sa senzora i stavlja ih low ili high state
unsigned int HALL2 = GPIO_ReadInputDataBit( GPIOB, GPIO_Pin_7);
unsigned int HALL3 = GPIO_ReadInputDataBit( GPIOB, GPIO_Pin_8);
	
if (TIM_GetITStatus(TIM4, TIM_IT_CC1) != RESET) {      										// provjerava se koji je input izazvao interrupt
TIM_ClearITPendingBit(TIM4, TIM_IT_CC1); 															// ciscenje pending zastavice koja oznacava da je izazvan interruupt
if (HALL1 == 1 ){																											// provjerava jel ulaz koji je izazvao prekid u low ili high state
}
else //
 
}		
else if (TIM_GetITStatus(TIM4, TIM_IT_CC2) != RESET) { 
TIM_ClearITPendingBit(TIM4, TIM_IT_CC2); 
if (HALL2 == 1 ){
//
}
//
}		
else if (TIM_GetITStatus(TIM4, TIM_IT_CC3) != RESET) { 
TIM_ClearITPendingBit(TIM4, TIM_IT_CC3);  
if (HALL3 == 1 ){
//
}
else //
}			
 
 

[TDK]

Been a while since I used SPL, but these two statements don't line up.

> Interrupt is triggered by every edge, falling or rising for each of 3 channels

and

TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; 

Don't you want TIM_ICPolarity_BothEdge?

[DCiko.1]

Yes, I forgot to change this line, but in original code i use TIM_ICPolarity_BothEdge.

[TDK]

I don't understand how one can post code that doesn't match what they're using in the project. Does copy/paste not work on your computer or something?

[waclawek.jan]

Read out and check/post the content of TIM registers.

JW

[Laurent Ca...]

Dear @Domagoj Ciković​ 

Do you have still this problem to solve?

Best regards

Laurent Ca...

[Laurent Ca...]

Dear @Domagoj Ciković​ 

I guess you don't have to solve this problem anymore, therefore I consider this thread closed.

If not, feel free to reopen it by posting a new answer.

Best regards

Laurent Ca...