altos: Clean up serial initialization

Flush serial input buffers when switching speeds.
Ensure pin configuration is correct.

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/ao_serial.c b/src/ao_serial.c
index dc68f8621f5fa4f5ad542dadcffe0e1a9eabdd84..9c0b798daf674cfcd894fe07db4eefa4c7cab236 100644 (file)
--- a/src/ao_serial.c
+++ b/src/ao_serial.c
@@ -119,6 +119,7 @@ ao_serial_set_speed(uint8_t speed)
        ao_serial_drain();
        if (speed > AO_SERIAL_SPEED_57600)
                return;
+       U1UCR |= UxUCR_FLUSH;
        U1BAUD = ao_serial_speeds[speed].baud;
        U1GCR = ao_serial_speeds[speed].gcr;
 }
@@ -129,7 +130,8 @@ ao_serial_init(void)
        /* Set up the USART pin assignment */
        PERCFG = (PERCFG & ~PERCFG_U1CFG_ALT_MASK) | PERCFG_U1CFG_ALT_2;
 
-       /* ee has already set the P2SEL bits */
+       P2SEL = (P2SEL & ~(P2SEL_PRI3P1_MASK | P2SEL_PRI2P1_MASK)) |
+               (P2SEL_PRI3P1_USART1 | P2SEL_PRI2P1_USART1);
 
        /* Make the USART pins be controlled by the USART */
        P1SEL |= (1 << 6) | (1 << 7);
@@ -143,7 +145,7 @@ ao_serial_init(void)
        /* Reasonable serial parameters */
        U1UCR = (UxUCR_FLUSH |
                 UxUCR_FLOW_DISABLE |
-                UxUCR_D9_ODD_PARITY |
+                UxUCR_D9_EVEN_PARITY |
                 UxUCR_BIT9_8_BITS |
                 UxUCR_PARITY_DISABLE |
                 UxUCR_SPB_1_STOP_BIT |