From b6adeaea60bfda9493fb71d85c2bf458391100a7 Mon Sep 17 00:00:00 2001
From: Todd Herbert <herbert.todd@gmail.com>
Date: Tue, 17 Sep 2024 22:17:53 +1200
Subject: [PATCH] Add I2C bus to Heltec T114 header pins SDA: P0.13 SCL: P0.16

Uses bus 1, leaving bus 0 routed to the unpopulated footprint for the RTC (general future-proofing)
---
 variants/heltec_mesh_node_t114/variant.h | 21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/variants/heltec_mesh_node_t114/variant.h b/variants/heltec_mesh_node_t114/variant.h
index 454e669313..6a7c85b92d 100644
--- a/variants/heltec_mesh_node_t114/variant.h
+++ b/variants/heltec_mesh_node_t114/variant.h
@@ -92,13 +92,22 @@ No longer populated on PCB
 #define PIN_SERIAL2_TX (0 + 10)
 //  #define PIN_SERIAL2_EN (0 + 17)
 
-/**
-    Wire Interfaces
-    */
-#define WIRE_INTERFACES_COUNT 1
+/*
+ * I2C
+ */
+
+#define WIRE_INTERFACES_COUNT 2
+
+// I2C bus 0
+// Routed to footprint for PCF8563TS RTC
+// Not populated on T114 V1, maybe in future?
+#define PIN_WIRE_SDA (0 + 26) // P0.26
+#define PIN_WIRE_SCL (0 + 27) // P0.27
 
-#define PIN_WIRE_SDA (26)
-#define PIN_WIRE_SCL (27)
+// I2C bus 1
+// Available on header pins, for general use
+#define PIN_WIRE1_SDA (0 + 13) // P0.13
+#define PIN_WIRE1_SCL (0 + 16) // P0.16
 
 // QSPI Pins
 #define PIN_QSPI_SCK (32 + 14)