From 4a3d8845264ab73b2d495322e9e443635b9ff328 Mon Sep 17 00:00:00 2001
From: Gunnar Skjold <gunnar.skjold@gmail.com>
Date: Tue, 11 Jul 2023 16:43:06 +0200
Subject: [PATCH] Disable TX pin on HAN port

---
 src/AmsToMqttBridge.cpp | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/src/AmsToMqttBridge.cpp b/src/AmsToMqttBridge.cpp
index ded2e872..676c4040 100644
--- a/src/AmsToMqttBridge.cpp
+++ b/src/AmsToMqttBridge.cpp
@@ -896,7 +896,7 @@ void setupHanPort(GpioConfig& gpioConfig, uint32_t baud, uint8_t parityOrdinal,
 
 		hwSerial->setRxBufferSize(64 * meterConfig.bufferSize);
 		#if defined(CONFIG_IDF_TARGET_ESP32S2) || defined(CONFIG_IDF_TARGET_ESP32C3)
-			hwSerial->begin(baud, serialConfig, -1, -1, invert);
+			hwSerial->begin(baud, serialConfig, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE, invert);
 			uart_set_pin(UART_NUM_1, UART_PIN_NO_CHANGE, pin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE);
 		#elif defined(ESP32)
 			hwSerial->begin(baud, serialConfig, -1, -1, invert);
@@ -914,6 +914,23 @@ void setupHanPort(GpioConfig& gpioConfig, uint32_t baud, uint8_t parityOrdinal,
 			}
 		#endif
 
+ 		// Prevent pullup on TX pin if not uart0
+		#if defined(CONFIG_IDF_TARGET_ESP32S2)
+			pinMode(17, INPUT);
+		#elif defined(CONFIG_IDF_TARGET_ESP32C3)
+			pinMode(7, INPUT);
+		#elif defined(ESP32)
+			if(pin == 9) {
+				pinMode(10, INPUT);
+			} else if(pin == 16) {
+				pinMode(17, INPUT);
+			}
+		#elif defined(ESP8266)
+			if(pin == 113) {
+				pinMode(15, INPUT);
+			}
+		#endif
+
 		#if defined(ESP32)
 		hwSerial->onReceiveError(rxerr);
 		#endif