dev/uart.c: now uart_read_byte() checks if there is data to be received

e189da53 · Tomasz Wlostowski · Grzegorz Daniluk · 5c4e478d · e189da53
Commit e189da53 authored May 31, 2012 by Tomasz Wlostowski Committed by Grzegorz Daniluk Jun 05, 2012
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uart.c dev/uart.c +4 -1

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--- a/dev/uart.c
+++ b/dev/uart.c
@@ -38,5 +38,8 @@ int uart_poll()
 int uart_read_byte()
 {
- 	return uart ->RDR & 0xff;
+	if(!uart_poll())
+		return -1;
+ 	return uart->RDR & 0xff;
 }
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