Is ST using the latest newlib, 4.1.0? Have they done anything to port it to their processors?.
The uart driver called by _read() is pulling characters from a ring buffer. The ST HAL RX callback that places characters into the ring buffer.
If I use read(x,*char, 1) it works fine. Only having a problem with getchar().
Here is my _read() implementation:
int _read(int file, char *ptr, int len)
{
int uartRtn;
// check file for valid value
if ((file < 0) || (file >= ioNumHandles))
{ // bad handle
return BAD_FILE_ID;
}
// read from the uart
uartRtn = uartRead(ioHandleArray[file].hUart, (BYTE*) ptr, len);
if (file == 0)
{
STDINreads++;
}
return uartRtn;
}
And here is my uartRead implementation:
int uartRead(UART_HandleTypeDef *hUart, BYTE *buffer, int nbytes)
{
int numBytes = 0;
uartDrvStruct *drv = NULL;
// find the matching uart driver structure
drv = uartGetDrvStruct(hUart);
// bad handle
if (drv == NULL)
{
return UART_BAD_UART;
}
// Driver will not be Opened unless intialized
// Only check open state
if (drv->opened != TRUE)
{
return UART_NOT_OPEN;
}
// disable the uart interrupt
HAL_NVIC_DisableIRQ(drv->irq);
// get bytes from RX ring buffer
numBytes = rngBufGet(drv->rxRingBuf, buffer, nbytes);
// enable interrupt
HAL_NVIC_EnableIRQ(drv->irq);
if (hUart == &hDEBUGSIO)
{
DebugUartReads++;
}
return numBytes;
}
