STM32H7 as USB audio device, with external PHY, USB3343, ULPI

[APagl]

I'm stuck ... on a number of levels, I believe, but first things first.

I have a custom PCB with a "main" 144-pin STMH743, six "DSP" 100-pin STMH743s, and a USB3343 to speak ULPI to a USB port.

Via SAI, the main H7 will be getting 10 to 12 channels of digital audio, two from each of the 5 to 6 DSP H7s.

The 10 to 12 channels of audio are to be sent via USB out to a host; e.g., a DAW running on a computer.

My current obstacle, one I need to get past before dealing with how to "package" up the digital audio to trasmit to the host, is to configure the main MCU's USB to use the ULPI chip and ... have the host even detect/recognize the STM32H7, running as a USB Audio Device.

I am using CubeMX for pretty much everything.

Under Connectivity, I have USB_OTG_HS chosen and configured as External PHY, Device_Only. The Parameter Settings show Speed: Device High Speed 480MBit/s; Physical interface: External Phy.

Under Middleware, I have USB_Device chosen and configured as Class For HS IP: Audio Device Class.

The CubeMX-generated main.c calls MX_USB_DEVICE_Init() which in turn calls USBD_Init(), USBD_RegisterClass(), USBD_AUDIO_RegisterInterface(), USBD_Start(), and HAL_PWREx_EnableUSBVoltageDetector().

From there the program continues runnning through the endless while, but when I connect the PCBs USB port to my Macbook Pro, no USB device is dectect.

Should I assume that I have need to do something after MX_USB_DEVICE_Init? I see that ST's demo program for USB_Device/Audio_Standalone goes to the endless while immediately after it calls the same functions MX_USB_DEVICE_Init does.

Using CubeMX to configure a simple test program, I have gotten a VCP working on a NUCLEO-H743ZI. Of course that was not with ULPI but my Mac certainly recognized the STM32 as USB device. I fully expect setting up and running an Audio Class device to be rather more complex.

I figure that after MX_USB_DEVICE_Init, the device should be visible to a host, but perhaps I'm missing something. I will later have questions about just how one sends all that audio, but first I have to figure out whatever handshaking I need, right? Does anyone have any suggestions on what I might try next?

Thanks.

[Ons KOOLI]

Hi @APagl​ ,

Can you please recheck the Pinouts of your ULPI , if they are well connected ?

You can refer for example to the usbd_conf.c file of the HID_Standalone application in HS mode. Here how the ULPI pins are configured in HS mode for the STM32H743I_EVAL board:

if (hpcd->Instance == USB1_OTG_HS)
  {
    /* Configure USB HS GPIOs */
    __GPIOA_CLK_ENABLE();
    __GPIOB_CLK_ENABLE();
    __GPIOC_CLK_ENABLE();
    __GPIOH_CLK_ENABLE();
    __GPIOI_CLK_ENABLE();
 
    /* CLK */
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    /* D0 */
    GPIO_InitStruct.Pin = GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    /* D1 D2 D3 D4 D5 D6 D7 */
    GPIO_InitStruct.Pin = GPIO_PIN_0 | GPIO_PIN_1 | GPIO_PIN_5 |
      GPIO_PIN_10 | GPIO_PIN_11 | GPIO_PIN_12 | GPIO_PIN_13;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
    /* STP */
    GPIO_InitStruct.Pin = GPIO_PIN_0;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
    /* NXT */
    GPIO_InitStruct.Pin = GPIO_PIN_4;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOH, &GPIO_InitStruct);
 
    /* DIR */
    GPIO_InitStruct.Pin = GPIO_PIN_11;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG1_HS;
    HAL_GPIO_Init(GPIOI, &GPIO_InitStruct);
    __HAL_RCC_USB1_OTG_HS_ULPI_CLK_ENABLE();
 
    /* Enable USB HS Clocks */
    __HAL_RCC_USB1_OTG_HS_CLK_ENABLE();
 
    /* Set USBHS Interrupt to the lowest priority */
    HAL_NVIC_SetPriority(OTG_HS_IRQn, 1, 0);
 
    /* Enable USBHS Interrupt */
    HAL_NVIC_EnableIRQ(OTG_HS_IRQn);
  }

Best Regards,

Ons.

[APagl]

Thanks very much.

I have checked the ULPI pin outs. Evidently via CubeMX, my pins, assigned by default are all the same except for DIR and NXT, which are on pins PC2_C and PC3_C respectively (as opposed to what looks like PI11 and PH4 in the usbd_conf.c you provided). Seems like a minor difference, but in any case, as I say they were assigned by default by CubeMX. See generated code below.

The only other differences I notice are that in the file you show:

1) CLK and D0 are set as GPIO_SPEED_FREQ_VERY_HIGH. In my CubeMX-generated file, all pins are GPIO_SPEED_FREQ_HIGH.

2) Your file: HAL_NVIC_SetPriority(OTG_HS_IRQn, 1, 0). My file: HAL_NVIC_SetPriority(OTG_HS_IRQn, 0, 0);

I don't see where in CubeMX, I might have the option to change the GPIO frequencies. And, the priority shown for the NVIC is ghosted out.

And, still no recognition of the USB connection by the Mac.

Ever hopeful, ....

void HAL_PCD_MspInit(PCD_HandleTypeDef* pcdHandle)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(pcdHandle->Instance==USB_OTG_HS)
  {
  /* USER CODE BEGIN USB_OTG_HS_MspInit 0 */
 
  /* USER CODE END USB_OTG_HS_MspInit 0 */
  
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
    /**USB_OTG_HS GPIO Configuration    
    PC0     ------> USB_OTG_HS_ULPI_STP
    PC2_C     ------> USB_OTG_HS_ULPI_DIR
    PC3_C     ------> USB_OTG_HS_ULPI_NXT
    PA3     ------> USB_OTG_HS_ULPI_D0
    PA5     ------> USB_OTG_HS_ULPI_CK
    PB0     ------> USB_OTG_HS_ULPI_D1
    PB1     ------> USB_OTG_HS_ULPI_D2
    PB10     ------> USB_OTG_HS_ULPI_D3
    PB11     ------> USB_OTG_HS_ULPI_D4
    PB12     ------> USB_OTG_HS_ULPI_D5
    PB13     ------> USB_OTG_HS_ULPI_D6
    PB5     ------> USB_OTG_HS_ULPI_D7 
    */
    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_2|GPIO_PIN_3;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
    HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
 
    GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_10|GPIO_PIN_11 
                          |GPIO_PIN_12|GPIO_PIN_13|GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF10_OTG2_HS;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
    /* Peripheral clock enable */
    __HAL_RCC_USB_OTG_HS_CLK_ENABLE();
    __HAL_RCC_USB_OTG_HS_ULPI_CLK_ENABLE();
 
    /* Peripheral interrupt init */
    HAL_NVIC_SetPriority(OTG_HS_IRQn, 0, 0);
    HAL_NVIC_EnableIRQ(OTG_HS_IRQn);
  /* USER CODE BEGIN USB_OTG_HS_MspInit 1 */
 
  /* USER CODE END USB_OTG_HS_MspInit 1 */
  }
}

[Ons KOOLI]

Hi @APagl​ ,

Can you please share with me your usbd_conf.c and usbd_conf.h files? Rather your .ioc file, maybe.

Best Regards,

Ons

[APagl]

Here are the three files.

Thanks,
Alan

[Ons KOOLI]

Hi @APagl​ ,

Can you re-share these files ? I did not receive anything, unfortunately.

Best Regards,

Ons.

[APagl]

I seem to be able to attach only one file at a time. After uploading the three files, I can add one file, and then when I try to attach a second, only the most recently attached file is listed under my message. It may only be the interface that is not clear to me, or perhaps it is the actual intent of the UI to prevent more than one file attachment per message. I suppose I'll try to send them in separate messages....

[Ons KOOLI]

Hi @APagl​ ,

Can you please share your schematic ? To see how the ULPI pinouts are connected.

Can you please inform which tools did you use and which versions : STM32Cube_FW_H7_VX.X.X, STM32Cubemx_Vx, STM32CubeIDE_Vx.

Best Regards,

Ons.