From 90b129a67a39cb0bbc0ae93bdfa0aa87f8260534 Mon Sep 17 00:00:00 2001
From: Bart Van Der Meerssche <bart.vandermeerssche@flukso.net>
Date: Tue, 10 May 2011 16:19:32 +0200
Subject: [PATCH] [avr] link the RS485 driver/receiver enable line to TXCIE0

---
 mote/v2/avr/uart.c | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/mote/v2/avr/uart.c b/mote/v2/avr/uart.c
index 7a81a47..7e4ff8d 100644
--- a/mote/v2/avr/uart.c
+++ b/mote/v2/avr/uart.c
@@ -238,7 +238,7 @@ u08 uartSendBuffer(char *buffer, u16 nBytes)
 	}
 }
 */
-// UART Transmit Complete Interrupt Handler
+// UART Data Register Empty Interrupt Handler
 UART_INTERRUPT_HANDLER(SIG_UART_DATA)
 {
 	// check if buffered tx is enabled
@@ -247,6 +247,8 @@ UART_INTERRUPT_HANDLER(SIG_UART_DATA)
 		// check if there's data left in the buffer
 		if(uartTxBuffer.datalength)
 		{
+			// set RS-485 into transmit mode
+			PORTD |= (1<<PD5);
 			// send byte from top of buffer
 			outb(UDR, bufferGetFromFront(&uartTxBuffer));
 		}
@@ -256,8 +258,10 @@ UART_INTERRUPT_HANDLER(SIG_UART_DATA)
 			uartBufferedTx = FALSE;
 			// return to ready state
 			uartReadyTx = TRUE;
-			// disable TXCIE0 interrupt
+			// disable UDRIE0 interrupt
 			UCR &= ~(1<<UDRIE0);
+			// enable TXCIE0 interrupt
+			UCR |= (1<<TXCIE0);
 		}
 	}
 	else
@@ -268,6 +272,15 @@ UART_INTERRUPT_HANDLER(SIG_UART_DATA)
 	}
 }
 
+// UART Transmit Complete Interrupt Handler
+UART_INTERRUPT_HANDLER(SIG_UART_TRANS)
+{
+	// set RS-485 into receive mode
+	PORTD &= ~(1<<PD5);
+	// disable TXCIE0 interrupt
+	UCR &= ~(1<<TXCIE0);
+}
+
 // UART Receive Complete Interrupt Handler
 UART_INTERRUPT_HANDLER(SIG_UART_RECV)
 {