X-Git-Url: https://www.fi.muni.cz/~kas/git//home/kas/public_html/git/?a=blobdiff_plain;f=firmware%2Frs485.c;fp=firmware%2Frs485.c;h=7aec92c8e54a4abf1f31691b411e44a5aac4a167;hb=db62b021ea5b82e91eaacb345ad81439a4cb41dc;hp=6d16a2af05840de11d0808bfe1d63c0ded2e5100;hpb=dc770d3e8804b9cb81fd1d0c7fc7336a14dd7c1f;p=openparking.git

diff --git a/firmware/rs485.c b/firmware/rs485.c
index 6d16a2a..7aec92c 100644
--- a/firmware/rs485.c
+++ b/firmware/rs485.c
@@ -34,7 +34,6 @@ static volatile char rxbuf[BUFSIZE], txbuf[BUFSIZE];
 
 #define UART_BAUD	9600
 #define UBRR_VAL        ((F_CPU + 8UL * UART_BAUD) / (16UL*UART_BAUD) - 1)
-#define wait_one_byte()	_delay_us(10*1000000/UART_BAUD)
 
 void rs485_init()
 {
@@ -99,13 +98,18 @@ ISR(USART_RX_vect)
 	sei();
 }
 
+ISR(USART_TX_vect)
+{
+	UCSR0B &= ~_BV(TXCIE0); // disable further IRQs
+	ctl_pin_off();
+}
+
 ISR(USART_UDRE_vect)
 {
 	cli();
 	if (tx_head == tx_tail) {
+		UCSR0B |= _BV(TXCIE0); // enable xmit complete irq
 		UCSR0B &= ~_BV(UDRIE0);
-		wait_one_byte();
-		ctl_pin_off();
 	} else {
 		UDR0 = txbuf[tx_tail];
 		tx_tail = bufptr_inc(tx_tail);