From f9996e229404f070c715d6aa9ac8b6d8d6c6028c Mon Sep 17 00:00:00 2001
From: Christof Schulze <christof.schulze@gmx.net>
Date: Sun, 25 Aug 2019 02:16:55 +0200
Subject: [PATCH] Display Backlight: automatically adjust to ambient sensor
reading
This registers a Task, reading the ambient light sensor once aminute and
adjusting the display backlight accordingly
---
epicardium/main.c | 18 +++++++++++++
epicardium/modules/brightness.c | 46 +++++++++++++++++++++++++++++++++
epicardium/modules/meson.build | 1 +
epicardium/modules/modules.h | 3 +++
4 files changed, 68 insertions(+)
create mode 100644 epicardium/modules/brightness.c
diff --git a/epicardium/main.c b/epicardium/main.c
index dadad9bf..5446909c 100644
--- a/epicardium/main.c
+++ b/epicardium/main.c
@@ -69,6 +69,23 @@ int main(void)
abort();
}
+ /* Automatically adjust the brightness of the display according to the
+ ** light sensor */
+ if (xTaskCreate(
+ vAutoBrightnessTask,
+ (const char *)"DisplayBrightness",
+ configMINIMAL_STACK_SIZE,
+ NULL,
+ tskIDLE_PRIORITY + 4,
+ NULL) != pdPASS) {
+ LOG_CRIT(
+ "startup",
+ "Failed to create %s task!",
+ "vAutoBrightnessTask"
+ );
+ abort();
+ }
+
/* MAX30001 */
if (xTaskCreate(
vMAX30001Task,
@@ -80,6 +97,7 @@ int main(void)
LOG_CRIT("startup", "Failed to create %s task!", "MAX30001");
abort();
}
+
/* API */
if (xTaskCreate(
vApiDispatcher,
diff --git a/epicardium/modules/brightness.c b/epicardium/modules/brightness.c
new file mode 100644
index 00000000..7097d28f
--- /dev/null
+++ b/epicardium/modules/brightness.c
@@ -0,0 +1,46 @@
+#include "epicardium.h"
+#include "modules.h"
+#include "log.h"
+
+bool _autobrightness_enabled = true;
+
+void vAutoBrightnessTask(void *pvParameters)
+{
+ vTaskDelay(pdMS_TO_TICKS(500));
+
+ while (1) {
+ vTaskDelay(pdMS_TO_TICKS(60000));
+ if (_autobrightness_enabled) {
+ unsigned short int light;
+
+ while (epic_light_sensor_run() < 0)
+ LOG_CRIT(
+ "autobrightness",
+ "Could not start ambient sensor"
+ );
+
+ while (epic_light_sensor_get(&light) < 0) {
+ LOG_CRIT(
+ "autobrightness",
+ "Could not read light sensor"
+ );
+ vTaskDelay(pdMS_TO_TICKS(500));
+ }
+
+ epic_light_sensor_stop();
+
+ unsigned short int brightness;
+
+ if (light > 199)
+ brightness = 100;
+ else
+ brightness = light / 2 + 1;
+
+ if (epic_disp_open() < 0)
+ continue;
+
+ epic_disp_backlight(brightness);
+ epic_disp_close();
+ }
+ }
+}
diff --git a/epicardium/modules/meson.build b/epicardium/modules/meson.build
index 693ca9a8..be92565f 100644
--- a/epicardium/modules/meson.build
+++ b/epicardium/modules/meson.build
@@ -1,6 +1,7 @@
module_sources = files(
'bhi.c',
'bme680.c',
+ 'brightness.c',
'buttons.c',
'dispatcher.c',
'display.c',
diff --git a/epicardium/modules/modules.h b/epicardium/modules/modules.h
index 2d51f786..d699485e 100644
--- a/epicardium/modules/modules.h
+++ b/epicardium/modules/modules.h
@@ -44,6 +44,9 @@ int personal_state_enabled();
/* ---------- PMIC --------------------------------------------------------- */
void vPmicTask(void *pvParameters);
+/* ---------- Automatically adjust Brightness ------------------------------ */
+void vAutoBrightnessTask(void *pvParameters);
+
/* ---------- Watchdog ----------------------------------------------------- */
void watchdog_init();
void watchdog_clearer_init();
--
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