[En-Nut-Discussion] possible bug in fopen?

[Harald Kipp]

Hi Ulrich,

On 5/6/2011 10:13 AM, uprinz wrote:

> While debugging with insight-gdb I can see, that the bootloader initialized
> the USART and does an fopen call. Right after the fopen there is an USART
> interrupt fired. This isn't what I expected as at that point no printf ever
> has been called.

I'm not familiar with STM32 peripherals, but I'm almost sure, that the
reason for the interrupt is in this area.

The only case I can think of is, that an XON is sent early with a
special software handshake mode, which assumes, that the remote sender
is in XOFF state initially. But I do not think, that this special mode
ever had been implemented in any Nut/OS driver.

Btw. this mode is often used with CNC machines.

Regards,

Harald