[En-Nut-Discussion] Receiving weird 0 on UART

[Manuel Mausz]

I've just noticed that the list has deleted my attachment.

Test prog @ http://www.netcore.at/misc/test.c

/ manuel

> -----Original Message-----
> From: en-nut-discussion-bounces at egnite.de
> [mailto:en-nut-discussion-bounces at egnite.de]On Behalf Of Manuel Mausz
> Sent: Monday, April 17, 2006 5:56 PM
> To: en-nut-discussion at egnite.de
> Subject: [En-Nut-Discussion] Receiving weird 0 on UART
>
>
> Hi list,
>
> we're currently building a client<->server application and therefor we're using the ethernut 1.3 rev. F board (as server). To
> communicate with the other selfmade boards(/clients), we're using a SN75176BP to convert from RS232 to RS485.
>
> For testing purpose our client board is just echoing all characters. If we run the attached test program without the RS485 driver,
> everything works as expected. But if we add the driver and ethernut is sending characters first (line 114), we always receive a 0
> before we get the sent characters. If we run another test program which only let the client board send data, we don't get any 0s.
>
> Since we're stuck now, any input would be appreciated.
>
> Setup:
> Driver SN75176BP:
> PIND5 -> ^RE/DE
> PIND2(RX) -> R
> PIND3(TX) -> D
>
> Ethernut 4.1.3
> UART1_HDX_BIT = 5
> UART1_HDX_AVRPORT = AVRPORTD
>
> Regards,
> / manuel
>