Please let me know how to use CDC (USB device) with STM503RB to open Com port

[LukeJang522]

Hi,

I'm trying to set up the CDC  with my H053RB board. and I found a guide on following link.

https://community.st.com/t5/stm32-mcus/how-to-use-stmicroelectronics-classic-usb-device-middleware-with/ta-p/599274

But I realized there was issue about HardFault_Handler. it happened all the time even though I commented  out the ICACHE line as below.

MX_GPIO_Init();

//MX_ICACHE_Init();

MX_USART1_UART_Init();

MX_USART3_UART_Init();

MX_USB_PCD_Init();

/* USER CODE BEGIN 2 */

while(hUsbDeviceFS.pClassData == NULL);

//HAL_Delay(8); // Minimum needed delay

MX_ICACHE_Init();

/* USER CODE END 2 */

/* Infinite loop */

I'm wondering if there are any workaround for this issue. 

Thanks,

Luke.

[STTwo-32]

Hello @LukeJang522 

I suggest you to take a look at this example. It should be helpful.

Best Regards.

STTwo-32 

[LukeJang522]

STTwo-32,

Thank you for your reply. 

I'm trying to generate the code that you sent the link, but there's errors. 

1. there is no tx_api.h file.

app_threadx.h

/* Includes ------------------------------------------------------------------*/

#include "tx_api.h"

2. even I copy the file forcibly, there are another errors as below

In file included from ../Core/Src/app_threadx.c:22:

../Core/Inc/app_threadx.h:64:1: error: unknown type name 'UINT'

64 | UINT App_ThreadX_Init(VOID *memory_ptr);

| ^~~~

../Core/Inc/app_threadx.h:64:23: error: unknown type name 'VOID'

64 | UINT App_ThreadX_Init(VOID *memory_ptr);

| ^~~~

../Core/Src/app_threadx.c:59:1: error: unknown type name 'UINT'

59 | UINT App_ThreadX_Init(VOID *memory_ptr)

| ^~~~

../Core/Src/app_threadx.c:59:23: error: unknown type name 'VOID'

59 | UINT App_ThreadX_Init(VOID *memory_ptr)

3. It seems like I can't just use the code, it might needs something else. 

I wasn't also able to generate the code by UX_Device_CDC_ACM.ioc file. 

I'm not sure there is another example or not. Could you please help me to fix it?

Thanks.

[LukeJang522]

Hi @STTwo-32 

I tried duplicating the code from the the link 

https://github.com/STMicroelectronics/STM32CubeH5/tree/main/Projects/NUCLEO-H503RB/Applications/USBX/Ux_Device_CDC_ACM

Bt i seems that it  never calls "entry function tx_application_define()". i've also chagne the "tx_initialize_low_level.S"

/* Set base of available memory to end of non-initialised RAM area. */

#ifdef USE_DYNAMIC_MEMORY_ALLOCATION

LDR r0, =_tx_initialize_unused_memory // Build address of unused memory pointer

//LDR r1, =Image$$RW_IRAM1$$ZI$$Limit // Build first free address

LDR r1, =|Image$$RW_IRAM1$$ZI$$Limit|

ADD r1, r1, #4 //

STR r1, [r0] // Setup first unused memory pointer

#endif

Even I tried to connect USB to CN3. 

Did I miss anything?

Thanks,