Two rotary encoders on same board
Hi everyone,
I'm working on a project where I need to set up two encoders.
I use included timers as timer encoder.
encoder 1 is configured on GPIO PB7/PB6
encoder 2 is configured on GPIO PB5/PB4
In order to isolate the mistake (hardware/software), here is what I tried:
First, only 1 encoder wired to the board, only 1 timer configured on my board/code, on GPIO PB7/PB6:
encoder 1 on PB7/PB6: working fine
encoder 2 on PB7/PB6: working fine
So hardware seems to be bine
Then I modify my test code, I kept same code excepted I changed PB7/PB6 for PB5/PB4
encoder 1 on PB5/PB4: not working
encoder 2 on PB5/PB4: not working
What is really strange and I don't understand:
In case scenario 2, if I put encoder 1 on PB7/PB6 and encoder 2 on PB5/PB4, only PB5/PB4 are initialized in my sketch, encoder 2 is not working but encoder 1 on PB7/PB6 is working.
I'm using STD Periph lib, STM32F103 and Keil
here is my simple test code
&sharpinclude 'stm32f10x.h'
&sharpinclude 'stm32f10x_rcc.h'&sharpinclude 'stm32f10x_gpio.h'&sharpinclude 'stm32f10x_tim.h'&sharpinclude 'delay.h'&sharpinclude 'lcd16x2.h'&sharpinclude <stdio.h>uint16_t enc_cnt;
char enc_cnt_buf[8];void init_lcd(void);
void init_rotary_encoder(void);void lcd_update(void);int main(void)
{ DelayInit(); init_lcd(); init_rotary_encoder(); while (1) { lcd_update(); }}void init_lcd()
{ // Initialize LCD lcd16x2_init(LCD16X2_DISPLAY_ON_CURSOR_OFF_BLINK_OFF);}void init_rotary_encoder()
{ GPIO_InitTypeDef GPIO_InitStruct; // Step 1: Initialize GPIO as input for rotary encoder // PB7 (TIM4_CH2) (encoder pin A), PB6 (TIM4_CH1) (encoder pin B) RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IPD; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_2MHz; GPIO_Init(GPIOB, &GPIO_InitStruct); // Step 2: Setup TIM4 for encoder input RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE); TIM_EncoderInterfaceConfig(TIM4, TIM_EncoderMode_TI12, TIM_ICPolarity_Rising, TIM_ICPolarity_Falling); TIM_Cmd(TIM4, ENABLE);}void lcd_update()
{ // Get encoder value enc_cnt = TIM_GetCounter(TIM4); // Print encoder value sprintf(enc_cnt_buf, '%i', enc_cnt); lcd16x2_clrscr(); lcd16x2_puts(enc_cnt_buf); lcd16x2_gotoxy(0,1); lcd16x2_puts('Running'); DelayMs(250);}maybe answer is obvious but I can't find it.
Thank you for your help
#stm32f103 #rotary-encoder