configure TX pin to high impedance to improve parallel operation

iltis42 · May 9, 2024 · 840eacc · 840eacc
1 parent 63aa91a
commit 840eacc
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/main/Serial.cpp b/main/Serial.cpp
@@ -300,8 +300,10 @@ void Serial::begin(){
 		else{
 			if( serial1_tx_enable.get() ){
 				ESP_LOGI(FNAME,"Serial pins normal, TX enabled" );
-				// Set UART pins(TX, RX, RTS, CTS ) RTS and CTS nor wired, dummy
-				ESP_ERROR_CHECK(uart_set_pin(uart_num, GPIO_NUM_37, GPIO_NUM_38, GPIO_NUM_33, GPIO_NUM_34));
+				// Set UART pins(TX, RX, RTS, CTS ) RX, RTS and CTS nor wired, dummy
+				ESP_ERROR_CHECK(uart_set_pin(uart_num, GPIO_NUM_36, GPIO_NUM_38, GPIO_NUM_33, GPIO_NUM_34));
+				gpio_set_direction(GPIO_NUM_37, GPIO_MODE_INPUT);     // TX: high impedance
+				gpio_pullup_dis( GPIO_NUM_37 );                       
 			}else{
 				ESP_LOGI(FNAME,"Serial pins normal, TX disable" );
 				ESP_ERROR_CHECK(uart_set_pin(uart_num, GPIO_NUM_9, GPIO_NUM_38, GPIO_NUM_33, GPIO_NUM_34));