X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=rpikern;a=blobdiff_plain;f=src%2Fserial.c;h=ba5faca3e36f0ac10ce126f294c682ad47e90eb5;hp=ddd5923da5b59d0b99ac3925237c699f01a71c1c;hb=99bdc8838f189f79ba77bfbbf41d7f1b4839ce0f;hpb=9a3655a43358c43128f6e62c8d74ff3aa81960c7

diff --git a/src/serial.c b/src/serial.c
index ddd5923..ba5faca 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -10,12 +10,16 @@ void init_serial(int baud)
 {
 	uint32_t bdiv_fp6;
 
+	mem_barrier();
 	REG_CR = 0;		/* disable UART */
 
 	/* disable pullups for GPIO 14 & 15 */
 	gpio_pullups(0xc000, 0, PUD_DISABLE);
+	/* select alt0 function for GPIO 14 & 15 */
+	/*gpio_fsel(14, FSEL_ALT0);
+	gpio_fsel(15, FSEL_ALT0);*/
 
-	REG_ICR = 0;	/* clear pending interrupts */
+	REG_ICR = 0x7ff;	/* clear pending interrupts */
 
 	/* calculate baud rate divisor */
 	bdiv_fp6 = (UART_CLK << 6) / (16 * baud);
@@ -29,26 +33,35 @@ 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) {
-		if(*s == '\n') {
-			ser_putchar('\r');
-		}
 		ser_putchar(*s++);
 	}
 }