Set UCSR0A in serial_init

It contains the U2X0 bit, which must be cleared to get the desired
bitrate.  Some versions of the Arduino bootloader appear to leave it
set.

diff --git a/common/serial.c b/common/serial.c
index 2bf6901836064ece4517047dcb8d94f70838d99f..a5e5cae98ecae7dd5b7a9db2f1a94aeae70f0d35 100644 (file)
--- a/common/serial.c
+++ b/common/serial.c
@@ -11,6 +11,7 @@ void serial_init(uint16_t baud)
        baud = (F_CPU/16+baud/2)/baud-1;
        UBRR0H = baud>>8;
        UBRR0L = baud;
+       UCSR0A = 0;
        UCSR0C = BIT(UCSZ00) | BIT(UCSZ01);  // 8N1
        UCSR0B = BIT(RXEN0) | BIT(TXEN0) | BIT(RXCIE0);
 }