FIFOed Avalon Uart

There is an error in the fifoed_avalon_uart.c file (both 9.1 & 9.3 versions). When using as ALT_USE_SMALL_DRIVERS or FIFOED_AVALON_UART_SMALL (non-interrupt mode), the read routine doesn't work if requesting more than 1 byte, in fact it fails to get any bytes at all. I am attaching the changes I made to make it work. There were no tests for errors in status and I have not added any here. The only changes are in the "fifoed_avalon_uart_read" function. The changes have been tested and are working here. The uarts are being used here with 1K read and 1K write fifos at 1M baud in the FIFOED_AVALON_UART_SMALL mode. At this speed interrupts are not used as they interfere with operation.</SPAN>

int fifoed_avalon_uart_read (fifoed_avalon_uart_state* sp, char* ptr, int len, int flags)

{

int block;

int i;

block = !(flags & O_NONBLOCK);

i = 0;

do

{

while((IORD_FIFOED_AVALON_UART_STATUS(sp->base) &

FIFOED_AVALON_UART_CONTROL_RRDY_MSK) && (i < len))

{

IOWR_FIFOED_AVALON_UART_STATUS(sp->base, 0); // clear any error flags

ptr[i++] = IORD_FIFOED_AVALON_UART_RXDATA(sp->base); // get data

}

if( i > 0) // if anything there, return it

return i;

}

while(block);

ALT_ERRNO = EWOULDBLOCK;

return 0;

}