Hi all,
In RTEMS a snippet code for the writing interrupt mode (ns16550_write_support_int ), looks like this:
for (i = 0; i < out; ++i) {
set( port, NS16550_TRANSMIT_BUFFER, buf [i]);
}
Shouldn't we check, before writing to the register for the iterations after the first one, whether the character entered in the FIFO? (otherwise I think the 'for' loop could iterate so fast that the device had no time to process the character)
In such a case, something like
for (i = 0; i < out; ++i) {
/* Wait for transmitter holding register to be empty */
do {
status = get( port, NS16550_LINE_STATUS);
} while ((status & SP_LSR_THOLD) == 0); // Where SP_LSR_THOLD makes reference to TXFIFOE (from spruh73k.pdf section 19.5.1.19: LSR_UART Register)
set( port, NS16550_TRANSMIT_BUFFER, buf [i]);
}
wouldn't be better?
Thanks in advance!
