From d3f76ce58b9c0ed2e5a9fe3bbc7fb9cb38247714 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sat, 18 Jul 2009 01:04:17 -0700 Subject: [PATCH] Drain serial port before changing speed Signed-off-by: Keith Packard --- src/ao_serial.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/src/ao_serial.c b/src/ao_serial.c index 7bc11b97..4155e776 100644 --- a/src/ao_serial.c +++ b/src/ao_serial.c @@ -75,6 +75,13 @@ ao_serial_putchar(char c) __critical ao_serial_tx1_start(); } +static void +ao_serial_drain(void) __critical +{ + while (!ao_fifo_empty(ao_usart1_tx_fifo)) + ao_sleep(&ao_usart1_tx_fifo); +} + static void send_serial(void) { @@ -115,6 +122,9 @@ static const struct { void ao_serial_set_speed(uint8_t speed) { + ao_serial_drain(); + if (speed > AO_SERIAL_SPEED_57600) + return; U1BAUD = ao_serial_speeds[speed].baud; U1GCR = ao_serial_speeds[speed].gcr; } -- 2.30.2