From 2696bf821fffbb1bd8effadce80e178ee8bfd4b7 Mon Sep 17 00:00:00 2001
From: Rahix <rahix@rahix.de>
Date: Thu, 16 Sep 2021 22:56:29 +0200
Subject: [PATCH] feat(display): Sleep display if backlight is off
Adapted from previous implementation in !476. To quote:
> This saves about 1 mA when the display is off.
---
epicardium/drivers/display/api.c | 5 +++++
epicardium/drivers/display/lcd.c | 11 +++++++++++
epicardium/drivers/display/lcd.h | 1 +
3 files changed, 17 insertions(+)
diff --git a/epicardium/drivers/display/api.c b/epicardium/drivers/display/api.c
index f0a145292..25a6ebae3 100644
--- a/epicardium/drivers/display/api.c
+++ b/epicardium/drivers/display/api.c
@@ -339,6 +339,11 @@ int epic_disp_framebuffer(union disp_framebuffer *fb)
int epic_disp_backlight(uint16_t brightness)
{
/* TODO: lock? */
+ if (brightness == 0) {
+ lcd_set_sleep(true);
+ } else {
+ lcd_set_sleep(false);
+ }
LCD_SetBacklight(brightness);
return 0;
}
diff --git a/epicardium/drivers/display/lcd.c b/epicardium/drivers/display/lcd.c
index ae0eac9c6..ac0e6c30c 100644
--- a/epicardium/drivers/display/lcd.c
+++ b/epicardium/drivers/display/lcd.c
@@ -86,6 +86,8 @@ static void lcd_delay(size_t millis)
/* HAL Interfaces }}} */
enum lcd_commands {
+ /** Sleep In */
+ LCD_SLPIN = 0x10,
/** Sleep Out */
LCD_SLPOUT = 0x11,
/** Display Inversion On */
@@ -157,6 +159,15 @@ static void lcd_hard_reset(void)
lcd_delay(20);
}
+void lcd_set_sleep(bool sleep)
+{
+ if (sleep) {
+ lcd_send_command(LCD_SLPIN, NULL, 0);
+ } else {
+ lcd_send_command(LCD_SLPOUT, NULL, 0);
+ }
+}
+
/**
* Perform a minimal initialization under the assumption that the bootloader has
* already turned on the display. This is faster and prevents visible
diff --git a/epicardium/drivers/display/lcd.h b/epicardium/drivers/display/lcd.h
index 3b8a507d6..104f8e6b0 100644
--- a/epicardium/drivers/display/lcd.h
+++ b/epicardium/drivers/display/lcd.h
@@ -3,6 +3,7 @@
#include <stdbool.h>
#include <stdint.h>
+void lcd_set_sleep(bool sleep);
void lcd_reconfigure(void);
void lcd_initialize(void);
void lcd_write_fb_partial(
--
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