altos/telelco-v3.0: Control LCD backlight with PWM

[fw/altos] / src / telelco-v3.0 / ao_lco_v3.c

diff --git a/src/telelco-v3.0/ao_lco_v3.c b/src/telelco-v3.0/ao_lco_v3.c
index 7c81a2e5babd3ddaf4c1f5c69c00c88469e0ed1b..c991ae6e4822af80fe479b90fe955f657bb32704 100644 (file)
--- a/src/telelco-v3.0/ao_lco_v3.c
+++ b/src/telelco-v3.0/ao_lco_v3.c
@@ -23,6 +23,7 @@
 #include <ao_radio_cmac.h>
 #include <ao_st7565.h>
 #include <ao_adc_single.h>
+#include <ao_pwm.h>
 
 #define WIDTH  AO_ST7565_WIDTH
 #define HEIGHT AO_ST7565_HEIGHT
@@ -45,7 +46,6 @@ static const struct ao_transform logo_transform = {
 
 #define BIG_FONT BitstreamVeraSans_Roman_58_font
 #define VOLT_FONT BitstreamVeraSans_Roman_58_font
-#define CONTRAST_FONT BitstreamVeraSans_Roman_58_font
 #define SMALL_FONT BitstreamVeraSans_Roman_12_font
 #define TINY_FONT BitstreamVeraSans_Roman_10_font
 #define LOGO_FONT BenguiatGothicStd_Bold_26_font
@@ -71,6 +71,12 @@ static const struct ao_transform logo_transform = {
 #define CONTRAST_Y     20
 #define CONTRAST_HEIGHT        20
 
+#define BACKLIGHT_LABEL_X      37
+#define BACKLIGHT_WIDTH        100
+#define BACKLIGHT_X    (WIDTH - BACKLIGHT_WIDTH) / 2
+#define BACKLIGHT_Y    20
+#define BACKLIGHT_HEIGHT       20
+
 #define AO_LCO_DRAG_RACE_START_TIME    AO_SEC_TO_TICKS(5)
 #define AO_LCO_DRAG_RACE_STOP_TIME     AO_SEC_TO_TICKS(2)
 
@@ -137,21 +143,40 @@ _ao_lco_show_contrast(void)
        ao_rect(&fb, CONTRAST_X, CONTRAST_Y, contrast, CONTRAST_HEIGHT, AO_BLACK, AO_COPY);
 }
 
+static void
+_ao_lco_show_backlight(void)
+{
+       int32_t backlight = ao_lco_get_backlight();
+       int16_t value = (int16_t) (backlight * BACKLIGHT_WIDTH / AO_LCO_MAX_BACKLIGHT);
+
+       ao_text(&fb, &SMALL_FONT, BACKLIGHT_LABEL_X, LABEL_Y, "Backlight", AO_BLACK, AO_COPY);
+       ao_rect(&fb, BACKLIGHT_X, BACKLIGHT_Y, value, BACKLIGHT_HEIGHT, AO_BLACK, AO_COPY);
+}
+
 void
 ao_lco_show(void)
 {
        ao_mutex_get(&ao_lco_display_mutex);
        ao_rect(&fb, 0, 0, WIDTH, HEIGHT, AO_WHITE, AO_COPY);
-       if (ao_lco_box == AO_LCO_LCO_VOLTAGE) {
+       switch (ao_lco_box) {
+       case AO_LCO_LCO_VOLTAGE:
                _ao_lco_batt_voltage();
-       } else if (ao_lco_box == AO_LCO_CONTRAST) {
+               break;
+       case AO_LCO_CONTRAST:
                _ao_lco_show_contrast();
-       } else if (ao_lco_pad == AO_LCO_PAD_VOLTAGE) {
-               _ao_lco_show_voltage(ao_pad_query.battery, "Pad battery");
-       } else {
-               _ao_lco_show_pad(ao_lco_pad);
-               _ao_lco_show_box(ao_lco_box);
-               ao_rect(&fb, SEP_X, 0, 2, HEIGHT, AO_BLACK, AO_COPY);
+               break;
+       case AO_LCO_BACKLIGHT:
+               _ao_lco_show_backlight();
+               break;
+       default:
+               if (ao_lco_pad == AO_LCO_PAD_VOLTAGE) {
+                       _ao_lco_show_voltage(ao_pad_query.battery, "Pad battery");
+               } else {
+                       _ao_lco_show_pad(ao_lco_pad);
+                       _ao_lco_show_box(ao_lco_box);
+                       ao_rect(&fb, SEP_X, 0, 2, HEIGHT, AO_BLACK, AO_COPY);
+               }
+               break;
        }
        ao_st7565_update(&fb);
        ao_mutex_put(&ao_lco_display_mutex);
@@ -181,15 +206,30 @@ ao_lco_set_select(void)
 
 
 void
-ao_lco_set_contrast(int16_t contrast)
+ao_lco_set_contrast(int32_t contrast)
 {
        ao_st7565_set_brightness((uint8_t) contrast);
 }
 
-int16_t
+int32_t
 ao_lco_get_contrast(void)
 {
-       return (int16_t) ao_st7565_get_brightness();
+       return (int32_t) ao_st7565_get_brightness();
+}
+
+static uint16_t ao_backlight;
+
+void
+ao_lco_set_backlight(int32_t backlight)
+{
+       ao_backlight = (uint16_t) backlight;
+       ao_pwm_set(AO_LCD_BL_PWM_CHAN, ao_backlight);
+}
+
+int32_t
+ao_lco_get_backlight(void)
+{
+       return (int32_t) ao_backlight;
 }
 
 static struct ao_task  ao_lco_drag_task;