Encoder Interface and Default_handler

[ahmed2399]

Posted on November 29, 2012 at 13:48

I'm trying  to read the tow signals from the encoder quadrature . I work with COIDE of coocox. but I don't know how i should write in the Default_handler (IRQ_TIM3).

I want read the both edges of the encoder signals,and know the value of my counter timer. 1) I ask if my configuration are OK ? 2) how i write in the IRQ of ''startup_stm32f10x_md_vl.c'' in encoder.c I write : &sharpinclude ''stm32f10x.h'' &sharpinclude ''encodeur.h'' void config(void){   TIM_TimeBaseInitTypeDef  TIM_TimeBaseStructure;   TIM_ICInitTypeDef  TIM_ICInitStructure;   GPIO_InitTypeDef GPIO_InitStructure_Encoder;   /* Enable TIMER GPIO clocks */   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);   RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3,ENABLE);   GPIO_InitStructure_Encoder.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;   GPIO_InitStructure_Encoder.GPIO_Mode = GPIO_Mode_IN_FLOATING;   GPIO_InitStructure_Encoder.GPIO_Speed = GPIO_Speed_50MHz;   GPIO_Init(GPIOB,&GPIO_InitStructure_Encoder);       /* Timer configuration in Encoder mode */   TIM_DeInit(ENCODER_TIM);   TIM_TimeBaseStructure.TIM_Prescaler = 0;  // No prescaling   TIM_TimeBaseStructure.TIM_Period = ENCODER_TIM_PERIOD-1;   TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;   TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;   TIM_TimeBaseInit(ENCODER_TIM, &TIM_TimeBaseStructure);   TIM_EncoderInterfaceConfig(ENCODER_TIM, TIM_EncoderMode_TI12,TIM_ICPolarity_Rising, TIM_ICPolarity_Falling);   TIM_ICStructInit(&TIM_ICInitStructure);   TIM_ICInitStructure.TIM_ICFilter = ENC_FILTER;//ICx_FILTER;   TIM_ICInit(ENCODER_TIM, &TIM_ICInitStructure);   ENCODER_TIM->CNT = 0;   TIM_Cmd(ENCODER_TIM, ENABLE); } int main(void){     void config(void); } ________________ in the ''startup_stm32f10x_md_vl.c'' i write // configuration static void Default_Handler(void) {   /* Go into an infinite loop. */   while (1) {    int curCount= ENCODER_TIM->CNT; // i juste added this line in this file   }} #enoder-interface-handler

[Tesla DeLorean]

Posted on November 30, 2012 at 21:15

He's using TIM_GetCounter(TIM4); aka TIM4->CNT

It's a single register, it should be pretty apparent if it's counting up or down, or not. Sit in a loop and see if it changes and printf() the new value, and repeat.

[ahmed2399]

Posted on November 30, 2012 at 22:39  

[Tesla DeLorean]

Posted on November 30, 2012 at 23:39

On the F1 series, input pulled up is

GPIO_InitStructure_Encoder.GPIO_Mode = GPIO_Mode_IPU;

[M0NKA]

Posted on December 01, 2012 at 12:46

Here the working reading routine:

// Fir Selection public __IO FirSelection        fs; static void UiDriverUpdateFirSelection(void) {     fs.value_new = TIM_GetCounter(TIM4);     // Ignore lower value flickr     if(fs.value_new < ENCODER_FLICKR_BAND)         return;     // Ignore higher value flickr     if(fs.value_new > (FIR_ENCODER_RANGE/FIR_ENCODER_LOG_D) + ENCODER_FLICKR_BAND)         return;     // No change, return     if(fs.value_old == fs.value_new)         return;     //printf(''fir pot: %d\n\r'',fs.value_new);     // Update filter     control_whatever(ag.value_new - ENCODER_FLICKR_BAND);     // Updated     fs.value_old = fs.value_new; } void main() { // Init FIR pot     fs.value_old             = 0;     fs.value_new            = FIR_ENCODER_RANGE; while(1) { UiDriverUpdateFirSelection(); } } // Protective band on top and bottom scale // dependent on encoder quality and debounce // capacitors #define ENCODER_FLICKR_BAND    3 // -------------------------------- // Maximum pot value #define FIR_ENCODER_RANGE    10 // Divider to create non linearity #define FIR_ENCODER_LOG_D    1 // FIR selector public structure typedef struct FirSelection {     // pot values     //     ulong    value_old;            // previous value     ulong    value_new;            // most current value } FirSelection; So your controlled function will get a value from 0 - 10 based on encoder position. When max value is reached - no call to the function will be send, same for lowest position. Hope this helps.

[ahmed2399]

Posted on December 01, 2012 at 14:08

so i will change the mode ..i found IPU mode and i will test again

[aadityadengle]

Posted on December 03, 2014 at 16:47

@wolf_man

Can you put your final code here, Please?

[Tesla DeLorean]

Posted on December 03, 2014 at 19:49

This is a two year old thread, start a new one, state your specific situation, and pin connectivity. I know I've posted several, working, encode mode examples here on the forum.