Clarification on the Hall Interrupt

6 replies
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I always observe a spike when i start to run the motor which leads to audible noise or jerk when i went through the code to modify i have observed the variable hAux little confusing request to please confirm if it is intended

__weak void *HALL_TIMx_CC_IRQHandler(void *pHandleVoid)
{
 if (pHandle->OVFCounter != 0U)
 {
 /* Adjust the capture using prescaler */
 uint16_t hAux;
 hAux = hPrscBuf + 1U;
 wCaptBuf *= hAux;

again declared
 if (pHandle->RatioDec) /* and don't decrease it again */
 {
 /* Adjust the capture using prescaler */
 uint16_t hAux;
 hAux = hPrscBuf + 2U;
 wCaptBuf *= hAux;

again declared

 else /* If prescaler was not modified on previous capture */
 {
 /* Adjust the capture using prescaler */
 uint16_t hAux = hPrscBuf + 1U;
 wCaptBuf *= hAux;

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S

STuser2Author

Senior III

There is always in dip in speed then adjusts itself when i start the motor

speed dip

I am really not sure of the impact of this but i confirmed that it is happening due to the below transition of the code from if to else in the file hall_speed_pos_fdbk.c

if ((pHandle->BufferFilled < pHandle->SpeedBufferSize) && (wCaptBuf != 0U))
 {
 uint32_t tempReg = (pHandle->PseudoFreqConv / wCaptBuf) * (uint32_t)pHandle->Direction;
 pHandle->AvrElSpeedDpp = (int16_t)tempReg;
 }
 else
 {
 /* Average speed allow to smooth the mechanical sensors misalignement */
 pHandle->AvrElSpeedDpp = (int16_t)((int32_t)pHandle->PseudoFreqConv /
 (pHandle->ElPeriodSum / (int32_t)pHandle- >SpeedBufferSize)); /* Average value */

 }

Could you please confirm if that is the root cause or not, if yes request to please provide me the solution? I need to close these issues and thank you for support.