[ECOS] Simple serial comms

grahamlab graham.labdon@cranems.co.uk
Fri Jul 3 12:30:00 GMT 2009




Nick Garnett wrote:
> 
> grahamlab <graham.labdon@cranems.co.uk> writes:
> 
>> 
>> I have tried flow control but to no avail
>> there must be a way to receive more than 128 bytes has anybody got any
>> other
>> suggestions
> 
> Flow control should entirely solve your problem. Did you enable the
> same kind of flow control at both ends of the connection?
> 
> I have run tests that successfully transfer larger quantities of data
> at higher baud rates for long periods. So I don't believe there is a
> significant problem with the basic driver code.
> 
> Some other things to try:
> 
> - Test against a host with a real RS232 device. USB adaptors can do
>   weird things. It is worth eliminating this as a cause of problems,
>   particularly with regard to flow control.
> 
> - Try increasing STM32_RXBUFSIZE in the driver source to 128 or
>   more. Also add a diag_printf() to the overflow branch in the ISR to
>   see if it triggers.
> 
> - Avoid diag_printf() calls while waiting for data. If you are running
>   via GDB these calls can cause interrupts to be disabled while the
>   output is being sent. This may cause the driver to miss characters.
> 
> - It may be instructive to work out exactly which bytes are lost in
>   each message. This may give a clue as to which FIFO or buffer is
>   filling up.
> 
> 
> 
I wont be able to test against a 'real' host until monday
I have tried a variety of values for STM32_RXBUFSIZE  but nothing changes -
the overflow branch is not triggered
Is it possible for you to send me the programs you use to test the serial
interface?

Graham
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