USBx Write and Read Functions not created by STM32CubeMX

[SwaroopPK]

Hi,

I'm working on setting up a Virtual COM Port for the STM32H563 using bare metal code, without any operating system. As a reference, I'm using the STM32CubeH5 project for the NUCLEO-H563ZI board, STM32CubeH5/Projects/NUCLEO-H563ZI/Applications/USBX/Ux_Device_HID_CDC_ACM at main · STMicroelectronics/STM32CubeH5. I've created the IOC file and enabled USBX and CDC ACM, which are necessary. However, after generating the source files, I couldn't find any definitions for _ux_device_class_cdc_acm_write and _ux_device_class_cdc_acm_read.

I found Solved: How to use virtual COM port with nucleo-H563ZI - STMicroelectronics Community which suggests writing a _write function for printf using _ux_device_class_cdc_acm_write. This is my next step, but since I can't find _ux_device_class_cdc_acm_write, I'm stuck.

I'm using CubeMX version 6.11.1 and I'm required to stick to this version.

Is there anyone who can assist me?

Best Regards,

Swaroop

[FBL]

Hi @SwaroopPK 

You can find this example without threadx.

[SwaroopPK]

Hi @FBL ,

Thank you for the reply. I have looked into this code and my only concern here is the ux_device_stack_tasks_run() function that needs to be called in a while(true) loop. I have tried removing this dependency but could not accomplish this since every callback in the "UX Device Controller" uses the UX Device Stack to indicate a request.

Is there any way to have a initialize, deinitialize, read and write functionalities without the infinite while loop?

Regards,

Swaroop

[FBL]

Hi @SwaroopPK 

I suggest you insert a dummy flag to trigger USB events to manage the task. For example:

if (update_usb_data_event)
{
    USBX_Device_Process(NULL);
   // Clear the event flag after processing
    update_usb_data_event = false;
}

 So, this flag can be set when new data is ready to be processed.