Hi AWack
The Vbus voltage monitoring is already implemented and in the code and used for USBPD.
You can re-use the function for your own needs.
It is in the BSP_USBPD_PWR_VBUSGetVoltage function in the usbpd_pwr_user.c source. I copy it below.
In this case (without BSP) we are not using DMA because we monitor only one channel in this application. So we only reference to TCPP01_PORT0_VSENSE_ADC_INSTANCE.
__weak int32_t BSP_USBPD_PWR_VBUSGetVoltage(uint32_t Instance, uint32_t *pVoltage)
{
/* USER CODE BEGIN BSP_USBPD_PWR_VBUSGetVoltage */
/* Check if instance is valid */
int32_t ret = BSP_ERROR_NONE;
if ((Instance >= USBPD_PWR_INSTANCES_NBR) || (NULL == pVoltage))
{
ret = BSP_ERROR_WRONG_PARAM;
*pVoltage = 0;
}
else
{
uint32_t value;
uint32_t vadc;
uint32_t voltage;
value = LL_ADC_REG_ReadConversionData12(TCPP01_PORT0_VSENSE_ADC_INSTANCE);
vadc = (value * VDDA_APPLI) / ADC_FULL_SCALE;
voltage = vadc * (USBPD_PWR_VSENSE_RA + USBPD_PWR_VSENSE_RB ) / USBPD_PWR_VSENSE_RB ;
*pVoltage = voltage;
}
return ret;
/* USER CODE END BSP_USBPD_PWR_VBUSGetVoltage */
}
I hope I answered your question,
Best regards
Pascal
