fix(test): Fix uart test pin swapping

Author: lucasssvaz

tests/validation/uart/uart.ino

@@ -63,28 +63,33 @@ public:
     serial.end();
   }
 
+  void reset_buffers() {
+    recv_msg = "";
+    peeked_char = -1;
+  }
+
   void transmit_and_check_msg(const String &msg_append, bool perform_assert = true) {
+    reset_buffers();
     delay(100);
     serial.print("Hello from Serial" + String(uart_num) + " " + msg_append);
     serial.flush();
     delay(100);
     if (perform_assert) {
       TEST_ASSERT_EQUAL_STRING(("Hello from Serial" + String(uart_num) + " " + msg_append).c_str(), recv_msg.c_str());
+      log_d("UART%d received message: %s\n", uart_num, recv_msg.c_str());
     }
   }
 
   void onReceive() {
     char c;
-    recv_msg = "";
     size_t available = serial.available();
-    if (available != 0) {
+    if (peeked_char == -1) {
       peeked_char = serial.peek();
     }
     while (available--) {
       c = (char)serial.read();
       recv_msg += c;
     }
-    log_d("UART%d received message: %s\n", uart_num, recv_msg.c_str());
   }
 };
 
@@ -354,31 +359,24 @@ void change_pins_test(void) {
     esp_rom_gpio_connect_out_signal(config.default_rx_pin, SIG_GPIO_OUT_IDX, false, false);
   }
 
-  log_d("Swapping UART pins");
+  log_d("Swapping UART pins and testing transmission");
 
   if (TEST_UART_NUM == 1) {
-    Serial1.setPins(NEW_RX1, NEW_TX1);
-    TEST_ASSERT_EQUAL(NEW_RX1, uart_get_RxPin(1));
-    TEST_ASSERT_EQUAL(NEW_TX1, uart_get_TxPin(1));
+    UARTTestConfig& config = *uart_test_configs[0];
+    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));
+
+    uart_internal_loopback(config.uart_num, NEW_RX1);
+    config.transmit_and_check_msg("using new pins");
   } else {
     for (int i = 0; i < TEST_UART_NUM; i++) {
       UARTTestConfig& config = *uart_test_configs[i];
       UARTTestConfig& next_uart = *uart_test_configs[(i + 1) % TEST_UART_NUM];
       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);
-      config.begin(115200);
-    }
-  }
 
-  log_d("Re-enabling UART loopback");
-
-  if (TEST_UART_NUM == 1) {
-    uart_internal_loopback(1, NEW_RX1);
-  } else {
-    for (int i = 0; i < TEST_UART_NUM; i++) {
-      UARTTestConfig& config = *uart_test_configs[i];
-      UARTTestConfig& next_uart = *uart_test_configs[(i + 1) % TEST_UART_NUM];
       uart_internal_loopback(config.uart_num, next_uart.default_rx_pin);
       config.transmit_and_check_msg("using new pins");
     }