+ connecting to PC as a audio device class

[skson]

Hello, 

I am developing STM audio streaming device by nucleo-H753ZI.

 

Just I have done is bellow like:

1. configure  HSE by Cube MX and applied 25 MHz external oscillator physically .

- It works well when USB OTG FS mode.

2. Physically connected between H753ZI and  USB3300 ULPI 

(D0~D7, 3.3Vs, GNDs, NXT, DIR, RST, STP,  CLK)

D0->PA3,

D1->PB0,

D2-> PB1,

D3->PB10,

D4->PB11,

D5->PB12,

D6->PB13,

D7->PB5,

STP->PC0,

NXT->PC3,

DIR->PC2,

CLK->PA5,

2 of 3.3V pins,

2 of GND pins 

 

3. Checked Cube MX options : 

- USB OTG FS : Disabled

- USB OTG HS - Device only

- USB Device - (Class for HS IP) Audio Device Class, 48000 sample/s, Device descriptor : 1200

- NVIC : priority

    USB OTG global interrupt = 0
    USB OTG EndPoint I/O global interrupt = 0

4. Connected to PC as USB : No device detected on PC!

( I have edit MX_USB_DEVICE_Init(void) function for debugging : 

/* USER CODE BEGIN USB_DEVICE_Init_PostTreatment */
HAL_Delay(10); //insert
HAL_PWREx_EnableUSBVoltageDetector();

/* USER CODE END USB_DEVICE_Init_PostTreatment */

)

 

I wonder I have missed something essential...

could you let me know it?
Thank you.

 

[FBL]

Hi @skson 

First, I recommend using CRS SYNC with USB HS instance. This can be configured in CubeMX under the RCC tab.

Second, noticed the addition of HAL_Delay(10);. Could you clarify the purpose of this delay?

For your firmware configuration, I suggest referring to the example provided under ./Projects/STM32H747I-EVAL/Applications/USB_Device/Audio_Standalone

When using an external circuit for the ULPI interface, it’s crucial to ensure proper routing for signal integrity. Double-check for any loose connections or soldering issues. Consider using a logic analyzer or oscilloscope to monitor the ULPI signals.

[skson]

Dear, 

I'm appreciate your fast response.

1. Just following your advice, I enabled CRS SYNC with USB HS instance but there is no changes...

2. additional code : HAL_Delay(10); If it does not added, the code is stopped while running MX_USB_DEVICE_Init(). While debugging, it is result of trials, to avoid the runtime error.

I don't know why, but added this delay, it passed well.

3. I understand your wording as : there is an example of H7 USB Device - USB OTG HS Audio class.

If you share it correctly, it might help.

But I cannot find "Audio_Standalone" example in ./Projects/STM32H747I-EVAL/Applications/USB_Device/ folder.

To me, it seems like under : 

Best regards,

From Son.

 

[FBL]

Hi again @skson 

Some middleware libraries along with the projects are not available on Github. You can find them directly when downloading from STM32CubeH7.