The unified diff between revisions [1dfe3b7e..] and [68c54ace..] is displayed below. It can also be downloaded as a raw diff.

#
# old_revision [1dfe3b7eee76f3c8aea3b33932857682ee17701c]
# new_revision [68c54ace6787b0823a233e780455f7371665a228]
#
# patch "main.c"
#  from [cc6bdc935c17a517544beb8e177fc1093fff5249]
#    to [d5ad069a51eff072171a593f4f480b1e8aab11bb]
# 
# patch "uart.c"
#  from [07a014210246046a28c0b690de8dd6dd8af95e2d]
#    to [601012b857324c934c9bc318a55df1029187a16b]
# 
# patch "uart.h"
#  from [2d08795e26e7e976bded494c773936c5f91d1b69]
#    to [0b8aacd8b3674937065175bb8fd6ce1feafd477e]
#
============================================================
--- main.c	cc6bdc935c17a517544beb8e177fc1093fff5249
+++ main.c	d5ad069a51eff072171a593f4f480b1e8aab11bb
@@ -172,7 +172,8 @@ int main(void) {
 	while (1) {
 		char c;
 		putstr("prompt> ");
-		c = getch();
+		while (!getch(&c))
+			FP0XVAL ^= 0x04000000;
 		if (c == 0x0a)
 			continue;
 		putch(c);
============================================================
--- uart.c	07a014210246046a28c0b690de8dd6dd8af95e2d
+++ uart.c	601012b857324c934c9bc318a55df1029187a16b
@@ -4,8 +4,6 @@
 
 #define UARTBASE 0xE000C000
 
-#define FP0XVAL (*((volatile unsigned int *) 0x3FFFC014))
-
 #define RBR 0x00
 #define THR 0x00
 #define DLL 0x00
@@ -172,14 +170,11 @@ void puthex(unsigned int n) {
 	putstr(s+i);
 }
 
-char getch(void) {
-	char c;
+bool getch(char *c) {
+	if (uart_rxread == uart_rxwrite)
+		return FALSE;
 
-	while (uart_rxread == uart_rxwrite) {
-		FP0XVAL ^= 0x04000000;
-	}
-
-	c = uart_rxbuf[uart_rxread];
+	*c = uart_rxbuf[uart_rxread];
 	uart_rxread = (uart_rxread + 1) % UART_RXBUFSIZE;
-	return c;
+	return TRUE;
 }
============================================================
--- uart.h	2d08795e26e7e976bded494c773936c5f91d1b69
+++ uart.h	0b8aacd8b3674937065175bb8fd6ce1feafd477e
@@ -1,11 +1,13 @@
 #ifndef __UART_H
 #define __UART_H
 
+#include "types.h"
+
 void init_uart(void);
 void putch(char c);
 void putstr(char *s);
 void putint(unsigned int n);
 void puthex(unsigned int n);
-char getch(void);
+bool getch(char *c);
 
 #endif /* __UART_H */