X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=rpikern;a=blobdiff_plain;f=src%2Fserial.c;h=ba5faca3e36f0ac10ce126f294c682ad47e90eb5;hp=1bc13fedee87a5ab0b39f6e5c5f0e3326779951c;hb=99bdc8838f189f79ba77bfbbf41d7f1b4839ce0f;hpb=6da291dc416a718164b5596aa16b1901f2770732

diff --git a/src/serial.c b/src/serial.c
index 1bc13fe..ba5faca 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -10,6 +10,7 @@ void init_serial(int baud)
 {
 	uint32_t bdiv_fp6;
 
+	mem_barrier();
 	REG_CR = 0;		/* disable UART */
 
 	/* disable pullups for GPIO 14 & 15 */
@@ -32,22 +33,32 @@ void init_serial(int baud)
 
 	/* enable UART RX&TX */
 	REG_CR = CR_UARTEN | CR_TXEN | CR_RXEN;
+	mem_barrier();
 }
 
 void ser_putchar(int c)
 {
 	if(c == '\n') ser_putchar('\r');
 
+	mem_barrier();
 	while(REG_FR & FR_TXFF);
 	REG_DR = c & 0xff;
+	mem_barrier();
 }
 
 int ser_getchar(void)
 {
+	mem_barrier();
 	while(REG_FR & FR_RXFE);
 	return REG_DR & 0xff;
 }
 
+int ser_pending(void)
+{
+	mem_barrier();
+	return (REG_FR & FR_RXFE) == 0;
+}
+
 void ser_printstr(const char *s)
 {
 	while(*s) {