Added internal pullup to RXDx pins.

2010-08-06 02:28:07 +00:00
parent a194a7b585
commit ea2906b317
2 changed files with 6 additions and 0 deletions
@@ -214,6 +214,9 @@ bool rs485_baud_rate_set(
 static void rs485_usart_init(
    void)
 {
+    /* enable the internal pullup on RXD0 */
+    BIT_CLEAR(DDRD, DDD0);
+    BIT_SET(PORTD, PD0);
    /* enable Transmit and Receive */
    UCSR0B = _BV(TXEN0) | _BV(RXEN0);
    /* Set USART Control and Status Register n C */
@@ -165,6 +165,9 @@ bool serial_baud_rate_set(
 static void serial_usart_init(
    void)
 {
+    /* enable the internal pullup on RXD1 */
+    BIT_CLEAR(DDRD, DDD2);
+    BIT_SET(PORTD, PD2);
    /* enable Transmit and Receive */
    UCSR1B = _BV(TXEN1) | _BV(RXEN1);
    /* Set USART Control and Status Register n C */