AS5047 + NUCLEOF429ZI in encoder mode

Electronics and hardware
1

Hello there.

I use a AS5047 (AS5047P | ams) to perform a motion contol using quadratic encoder signals.

I usualy do this with a 446RE (and it works well), but we have switched to a 429ZI and I experience an issue with timer 4 connected to PD_12, PD_13, while still working well on TIM3 using PB_4 - PB_5.

Signal can be seen with a scope on the pins, but timer fail to return me any value.

I use this library (Encoder_Nucleo_16_bits - 32bits encoder counter using 16bits TIM and a 32b… | Mbed) a bit modified to match pinout (ie : using PD_12 and PD_13 instead of PB_6, PB_7) by using this code :

else if (htim->Instance == TIM4) { // PD12 - PD13
    __TIM4_CLK_ENABLE();
    __GPIOD_CLK_ENABLE();
    GPIO_InitStruct.Pin = GPIO_PIN_12 | GPIO_PIN_13;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_PULLDOWN;
    GPIO_InitStruct.Speed = GPIO_SPEED_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF2_TIM4;
    HAL_GPIO_Init(GPIOD, &GPIO_InitStruct);
}

But it fails to give me results.
@jeromecoutant : any idea ?

2

For STM32F429, TIM3 and TIM4 are really equivalent…