How to use virtual COM port with nucleo-H563ZI

[Christian_Janz]

Hello,

I am new in the STM world.

I am using the nucleo-H563ZI deverlopment board and I want to get the virtual COM port to work.

On github I found the examples of the Board.

https://github.com/STMicroelectronics/STM32CubeH5 

I opend the project "...\Projects\NUCLEO-H563ZI\Applications\USBX\Ux_Device_HID_CDC_ACM" and compiled it.

After that the PC recognize a vitual COM Port. So far so good.

Now I want to send or receive Data by the virtual COM port.

But I can't find the function for sending or receiving Data.

 

Is there anybody who can help me, please?

 

Best regards

Christian

 

 

[AScha.3]

to use printf(...) you need to send it to the usb->cdc ;

put in main:

 

 

 

int _write(int file, char *ptr, int len)
{
	 if(CDC_Transmit_FS((uint8_t *)ptr, len))
	 {
		 HAL_Delay(2);
		 CDC_Transmit_FS((uint8_t *)ptr, len);
	 }

 return len;
}

 

 

 

just a quick and dirty test...try :)

[Christian_Janz]

Hello AScha.3,

thank you for your quick reply.

I insert you code in example in section /* USER CODE BEGIN 4 */

And call printf before while(1) with printf("A");

By building project I got 4 errors:

I hope you can read it.

CDC_Transmit_FS is undefined.

[AScha.3]

aaaa, i thought it is clear: you have to replace this with the call you have in your actual system to "send" .

so on H563 + Azure you need the matching call ... (i just look...)

look also:

https://learn.microsoft.com/en-us/azure/rtos/usbx/usbx-device-stack-4

or

https://github.com/search?q=usbx%20cdc&type=repositories

 

should be something like:

ux_device_class_cdc_acm_write(cdc_acm, ...);

[Haithem Rahmani]

Hi @Christian_Janz 

First of all, welcome to STM32 World! :smiling_face_with_smiling_eyes:.

 

 

as described in the Readme.md file you'll need two Hyperterminals to exachange data between the board and the PC. Did you succeed to have that running?

[Christian_Janz]

Hi @Haithem Rahmani and @AScha.3

Thank you for your help.

 

@Haithem Rahmani 

"as described in the Readme.md file you'll need two Hyperterminals to exachange data between the board and the PC. Did you succeed to have that running?"

Yes, this is working fine.

I want to send and receive customized data from my programm and from PC via virtual com port.

Thanks to @AScha.3, I found the function to send Data (ux_device_class_cdc_acm_write()).

But my fault was to call it in main.c

If I call it in ux_device_cdc_acm.c and it workin fine. Here my quick test:

I am happy to get this to work.

But is it possible to call the function in main.c or how can share data from main.c to ux_device_cdc_acm.c?

Maybe with global variables?

[AScha.3]

Hi @Christian_Janz  , you have a lot to understand now - using a RTOS , no more "just" a program.

1. no more "main"  = the program ! now many "main" possible, all running (virtual) at same time.

2. read the comment in main.c , and believe it :

now your program is in processing tasks or threads !

so if you dont need this (maybe same me: had to use this Azure just because STM leaves us no choice anymore : want USB , Fat-file system ? then use Azure! )

you can use the first and only thread, that is generated by Cube if you let it do it :

then in core -> app_threadx.c :

 

i just rename this first thread to  >> tx_app_main_entry << , to see my "main" now by a similar name. :)

so write here, what you in old times wrote in "main" , here my H563 program begins:

 

void tx_app_main_entry(ULONG thread_input)
{
 /* USER CODE BEGIN tx_app_main_entry */
	printf("app_main start \n");
	/*##-2- Register the file system object to the FatFs module ##############*/
 	fresult = f_mount(&SDfs, (TCHAR const*)SDPath, 1);			// SD card mount
 if(fresult)
 {
 	printf(" mount error ! \n");
.....

 

- ( but i am using fatfs here , not filex )