alexeykosinov / redirect-printf-to-usb-vcp-on-stm32h7-mcu Goto Github PK
View Code? Open in Web Editor NEWEnable printf() function to work with USB Virtual COM Port (STM32H743ZI)
Enable printf() function to work with USB Virtual COM Port (STM32H743ZI)
Solution with osDelay(1) is not working properly at all times.
The issue occurs when CDC_Transmit_FS() is busy - returning len makes _write() skip all data sent while CDC_Transmit_FS() was busy.
Following code should work always:
int _write(int file, char *ptr, int len)
{
static uint8_t rc = USBD_OK;
do
{
rc = CDC_Transmit_FS(ptr, len);
} while (USBD_BUSY == rc);
if (USBD_FAIL == rc)
{
/// NOTE: Should never reach here.
/// TODO: Handle this error.
return 0;
}
return len;
}
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