feat(uart): avoid electrical noise before setting pins

Author: SuGlider

tests/validation/uart/uart.ino

@@ -368,6 +368,7 @@ void change_pins_test(void) {
     // internal loopback creates a BREAK on ESP32 and ESP32-S2
     // setting it before changing the pins solves it
     uart_internal_loopback(config.uart_num, NEW_RX1);
+    delay(5); // wait for internal circuit to settle
     config.serial.setPins(NEW_RX1, NEW_TX1);
     TEST_ASSERT_EQUAL(NEW_RX1, uart_get_RxPin(config.uart_num));
     TEST_ASSERT_EQUAL(NEW_TX1, uart_get_TxPin(config.uart_num));
@@ -379,6 +380,7 @@ void change_pins_test(void) {
       // internal loopback creates a BREAK on ESP32 and ESP32-S2
       // setting it before changing the pins solves it
       uart_internal_loopback(config.uart_num, next_uart.default_rx_pin);
+      delay(5); // wait for internal circuit to settle
       config.serial.setPins(next_uart.default_rx_pin, next_uart.default_tx_pin);
       TEST_ASSERT_EQUAL(uart_get_RxPin(config.uart_num), next_uart.default_rx_pin);
       TEST_ASSERT_EQUAL(uart_get_TxPin(config.uart_num), next_uart.default_tx_pin);
@@ -456,6 +458,7 @@ void periman_test(void) {
     // internal loopback creates a BREAK on ESP32 and ESP32-S2
     // setting it before changing the pins solves it
     uart_internal_loopback(config.uart_num, config.default_rx_pin);
+    delay(5); // wait for internal circuit to settle
     config.serial.setPins(config.default_rx_pin, config.default_tx_pin);
 
     log_d("Trying to send message using UART%d with I2C disabled", config.uart_num);