display works sortof

[rpikern] / src / serial.c

diff --git a/src/serial.c b/src/serial.c
index 1bc13fe..ba5faca 100644 (file)
--- 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) {