How to transmit from PC to STM32 to UART without USB to UART converter?

[arduo]

How can i transmit data through usb fs without ftdi usb to uart converter?

[Tesla DeLorean]

Be a CDC/VCP Device? See USB Device/Host Examples in HAL trees

[arduo]

i use the cdc standalone i can send data to usart tx and measure the right output but how can i manage the same functions with my mcu like the ftdi pl2303A

[Piranha]

Clive already said it - program STM32 to be a USB CDC/VCP device.

[arduo]

i programed it but the same thing which works for me with pl2303 ftdi( usb to uart port) is not working with my mcu via usart3

[Tesla DeLorean]

FTDI does not make Prolific parts.

Dont understand what "same function" is in this context. It is not going to act like a USART peripheral. You're going to want to manage the data into a buffer, and have routines to process and consume it from the buffer. Ie check a FIFO / ring buffer, not spin for RXNE ​

[arduo]

static int8_t CDC_Itf_Receive(uint8_t* Buf, uint32_t *Len)
{
 
	HAL_UART_Transmit_DMA(&UartHandle, Buf, *Len);
	//HAL_UART_Receive_DMA(&UartHandle,x Buf, *Len);
	CDC_Transmit_FS(Buf, *Len);
 
  return (USBD_OK);
}