[En-Nut-Discussion] Lost caracter with At91 UART0

[Remi Bilodeau]

I try to upload a file to SD card using Ymodem protocol. It not work. After
displaying caracter count on a LCD screen, I find the UART lost around 30%
of the transmission.

I get the RX and TX buffer size, reporting 256 byte on RX and 64 on TX for
AT91SAM7S256 using this: 
_ioctl(_fileno(stdin), UART_GETRXBUFSIZ, &parm);

So UART0 seem buffed in theory. I get caracter through stdin and stdout
after reopen it in binary mode:
    freopen(DEV_UART0_NAME, "w+b", stdout);
    stdin=stdout;

Using:   	
     int c;
     do { c = getchar(); } while(c==EOF);

I receive only 81-83 byte or 132 bytes transmitted. I also try to send 16
bytes in a burst, and board receive 12-15 bytes only.

I don't think 115200bps is too fast for AT91 IRQ, anyone have a idea ??????

Remi






-- 
View this message in context: http://old.nabble.com/Lost-caracter-with-At91-UART0-tp32983427p32983427.html
Sent from the MicroControllers - Ethernut mailing list archive at Nabble.com.