From c519710062b330c227306f21bae26c3a36cf3928 Mon Sep 17 00:00:00 2001
From: Alexis Svinartchouk <alexis@resin.io>
Date: Wed, 9 Dec 2020 12:51:34 +0100
Subject: [PATCH] Add SCREEN_PWM_DUTY_CYCLE env var

Change-type: patch
---
 update-config-and-start.js | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/update-config-and-start.js b/update-config-and-start.js
index 6fca5425..6e89462d 100644
--- a/update-config-and-start.js
+++ b/update-config-and-start.js
@@ -122,7 +122,19 @@ function zip(...arrays) {
 	return arrays[0].map((_, i) => arrays.map(array => array[i]));
 }
 
+async function updateScreenPWMDutyCycle() {
+	const dutyCycle = parseInt(env.SCREEN_PWM_DUTY_CYCLE);
+	if (dutyCycle !== undefined) {
+		try {
+			await fs.writeFile('/sys/class/pwm/pwmchip2/pwm0/duty_cycle', dutyCycle.toString());
+		} catch (error) {
+			console.error('Could not update screen PWM duty cycle', error);
+		}
+	}
+}
+
 async function main() {
+	await updateScreenPWMDutyCycle();
 	const osVersion = await getOsVersion();
 	const defaultConfig = db.default;
 	const hw = db[ETCHER_PRO_VERSION] || {};