From b974351c6a1eae4a1bd14fea53d95e6ffb35c6ec Mon Sep 17 00:00:00 2001
From: cam <cameron.ryan.pears@gmail.com>
Date: Fri, 15 Sep 2023 17:41:20 +1200
Subject: [PATCH] Power on RP2040

---
 src/Pinout.h | 1 +
 src/main.cpp | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/src/Pinout.h b/src/Pinout.h
index 5c628d9..5782fce 100644
--- a/src/Pinout.h
+++ b/src/Pinout.h
@@ -12,5 +12,6 @@
 #define BUTTON          PIN_PA6   // Connected to the button on the case.
 #define PING_PIN        PIN_PB2
 #define PI_SHUTDOWN     PIN_PA7   // Raspberry Pi will drive this pin low when it has finished powering off.
+#define EN_RP2040       PIN_PA1   // Drive low to power on rp2040.
 
 #endif
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 65dc35f..0b06e1f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -97,6 +97,7 @@ void setup() {
   pinMode(LED_B, OUTPUT);
   pinMode(EN_5V, OUTPUT);
   digitalWrite(EN_5V, HIGH);
+  pinMode(EN_RP2040, OUTPUT);
   pinMode(RTC_BAT_SENSE, INPUT);
   pinMode(MAIN_BAT_SENSE, INPUT);
   pinMode(RTC_ALARM, INPUT_PULLUP);
@@ -104,6 +105,8 @@ void setup() {
   pinMode(PI_SHUTDOWN, INPUT_PULLUP);
   statusLED.writeColor(0, 0, 0);
   
+  digitalWrite(EN_RP2040, LOW);
+
   // Check for a low battery.
   checkMainBattery();