From 5bd7a1220b33b506d4f2b11e9d878a6fc4ad6d6d Mon Sep 17 00:00:00 2001
From: H4W9 <hoferwade@gmail.com>
Date: Fri, 19 Jun 2026 23:15:21 -0500
Subject: [PATCH] MAX17048 fuel gauge for Marauder V8

---
 boards/marauder-v8/interface.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/boards/marauder-v8/interface.cpp b/boards/marauder-v8/interface.cpp
index ff41343c..3b317f19 100644
--- a/boards/marauder-v8/interface.cpp
+++ b/boards/marauder-v8/interface.cpp
@@ -6,6 +6,22 @@
 
 CYD28_TouchR touch(320, 240);
 
+// --- MAX17048 fuel gauge (SDA=GPIO5, SCL=GPIO4) ---
+#define MAX17048_ADDR    0x36
+#define MAX17048_REG_SOC 0x04
+
+int getBattery() {
+    Wire.beginTransmission(MAX17048_ADDR);
+    Wire.write(MAX17048_REG_SOC);
+    if (Wire.endTransmission(false) != 0) return 0;
+    if (Wire.requestFrom((int)MAX17048_ADDR, 2) != 2) return 0;
+    uint8_t hi = Wire.read();
+    Wire.read();
+    if (hi > 100) hi = 100;
+    return (int)hi;
+}
+
+
 /***************************************************************************************
 ** Function name: _setup_gpio()
 ** Location: main.cpp
@@ -26,6 +42,7 @@ void _setup_gpio() {
 ** Description:   second stage gpio setup to make a few functions work
 ***************************************************************************************/
 void _post_setup_gpio() {
+    Wire.begin(5, 4, 400000U); // MAX17048 I2C
     if (!touch.begin(&SPI)) {
         launcherConsolePrintf("%s\n", String("Touch IC not Started").c_str());
         log_i("Touch IC not Started");