altos: Bring up basic TeleTerra v0.2 UI

[fw/altos] / src / drivers / ao_lcd.c

diff --git a/src/drivers/ao_lcd.c b/src/drivers/ao_lcd.c
index e62247aecacbcf4c69ccceecaed922de8872f467..8745b3f631509858b7a83b1fc9aa29c63841a6e2 100644 (file)
--- a/src/drivers/ao_lcd.c
+++ b/src/drivers/ao_lcd.c
@@ -19,6 +19,8 @@
 
 static uint16_t        ao_lcd_time = 3;
 
+static __xdata uint8_t ao_lcd_mutex;
+
 static void
 ao_lcd_delay(void)
 {
@@ -39,7 +41,7 @@ ao_lcd_send_ins(uint8_t ins)
        ao_lcd_port_put_nibble(0, ins & 0xf);
 }
 
-void
+static void
 ao_lcd_put_byte(uint8_t c)
 {
 //     printf ("send data %02x\n", c);
@@ -54,8 +56,10 @@ ao_lcd_putstring(char *string)
 {
        char    c;
 
+       ao_mutex_get(&ao_lcd_mutex);
        while ((c = (uint8_t) *string++))
                ao_lcd_put_byte((uint8_t) c);
+       ao_mutex_put(&ao_lcd_mutex);
 }
 
 #define AO_LCD_POWER_CONTROL   0x54
@@ -63,24 +67,30 @@ ao_lcd_putstring(char *string)
 void
 ao_lcd_contrast_set(uint8_t contrast)
 {
+       ao_mutex_get(&ao_lcd_mutex);
        ao_lcd_send_ins(AO_LCD_POWER_CONTROL | ((contrast >> 4) & 0x3));
        ao_lcd_send_ins(0x70 | (contrast & 0xf));
+       ao_mutex_put(&ao_lcd_mutex);
 }
 
 void
 ao_lcd_clear(void)
 {
+       ao_mutex_get(&ao_lcd_mutex);
        ao_lcd_send_ins(0x01);
        ao_delay(1);
        /* Entry mode */
        ao_lcd_send_ins(0x04 | 0x02);
+       ao_mutex_put(&ao_lcd_mutex);
 }
 
 void
 ao_lcd_goto(uint8_t addr)
 {
+       ao_mutex_get(&ao_lcd_mutex);
        ao_lcd_send_ins(0x80 | addr);
        ao_lcd_send_ins(0x04 | 0x02);
+       ao_mutex_put(&ao_lcd_mutex);
 }
 
 void