audioMux/firmware/Src/usbd_cdc_syscalls.c

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#include "usbd_cdc_if.h"
const long USB_SEND_TIMEOUT = 10000L;
uint8_t buffer[128];
volatile int bufferindex = 0;
void __io_flush() {
long count = 0;
while(count < USB_SEND_TIMEOUT && CDC_Transmit_FS(buffer, bufferindex) == USBD_BUSY) {
++count;
}
bufferindex = 0;
}
int __io_putchar( int ch )
{
if (ch == '\n') __io_putchar('\r');
buffer[bufferindex++] = ch;
if (ch == '\n' || bufferindex == sizeof(buffer)) __io_flush();
return 1;
}