access STULPI01A registers from firmware

[ckw089]

Hi,

We are using STM32H750XB MCU with the STULPI01A, external High-speed USB ULPI transceiver.

Is there a way to access STULPI01A registers from firmware running on the MCU ?

rgds,

kc Wong

[ckw089]

#define USB_OTG_GPVNDCTL_REGWR (0x1U << 22)
#define USB_OTG_GPVNDCTL_NEWREGREQ (0x1U << 25)
#define USB_OTG_GPVNDCTL_VSTSDONE (0x1U << 27)
#define USB_OTG_GPVNDCTL_OFFSET 0x34U
#define USBx_GPVNDCTL *(__IO uint32_t *)((uint32_t)USBx_BASE +
USB_OTG_GPVNDCTL_OFFSET)
 
/**
  * @brief  USB_ulpi_phy_ReadReg
  * @param  USBx Selected device
  * @param  USB PHY register address
  * @param  data buffer to store register value
  * @retval HAL status
  */
HAL_StatusTypeDef USB_ulpi_phy_ReadReg(USB_OTG_GlobalTypeDef *USBx, uint8_t
phyaddr, uint32_t *RegData)
{
  uint32_t USBx_BASE = (uint32_t)USBx;
  __IO uint32_t count = 0U;
 
  USBx_GPVNDCTL = (phyaddr << 16) | USB_OTG_GPVNDCTL_NEWREGREQ;
 
  do
  {
    count++;
 
    if (count > 200000U)
    {
      return HAL_TIMEOUT;
    }
  } while ((USBx_GPVNDCTL & USB_OTG_GPVNDCTL_VSTSDONE) !=
USB_OTG_GPVNDCTL_VSTSDONE);
 
  *RegData = USBx_GPVNDCTL & 0xFFU;
 
  return HAL_OK;
}
 
/**
  * @brief  USB_ulpi_phy_WriteReg
  * @param  USBx Selected device
  * @param  USB PHY register address
  * @param  register data
  * @retval HAL status
  */
HAL_StatusTypeDef USB_ulpi_phy_WriteReg(USB_OTG_GlobalTypeDef *USBx, uint8_t
phyaddr, uint32_t RegData)
{
  uint32_t USBx_BASE = (uint32_t)USBx;
  __IO uint32_t count = 0U;
 
  USBx_GPVNDCTL = (phyaddr << 16) |
                  USB_OTG_GPVNDCTL_NEWREGREQ |
                  USB_OTG_GPVNDCTL_REGWR |
                  (RegData & 0xFFU);
  do
  {
    count++;
 
    if (count > 200000U)
    {
      return HAL_TIMEOUT;
    }
  } while ((USBx_GPVNDCTL & USB_OTG_GPVNDCTL_VSTSDONE) !=
USB_OTG_GPVNDCTL_VSTSDONE);
 
  return HAL_OK;
}