CI: Add UART test (#8801)

Author: lucasssvaz

cores/esp32/esp32-hal-uart.c

@@ -329,7 +329,7 @@ bool uartSetPins(uint8_t uart_num, int8_t rxPin, int8_t txPin, int8_t ctsPin, in
     UART_MUTEX_UNLOCK();  
 
     if (!retCode) {
-        log_e("UART%d set pins failed.");
+        log_e("UART%d set pins failed.", uart_num);
     }
     return retCode;
 }
@@ -958,7 +958,7 @@ unsigned long uartDetectBaudrate(uart_t *uart)
 }
 
 /*
-    These functions are for testing puspose only and can be used in Arduino Sketches
+    These functions are for testing purpose only and can be used in Arduino Sketches
     Those are used in the UART examples
 */
 
@@ -968,15 +968,17 @@ unsigned long uartDetectBaudrate(uart_t *uart)
     This code "replaces" the physical wiring for connecting TX <--> RX in a loopback
 */
 
-// gets the right TX SIGNAL, based on the UART number
+// gets the right TX or RX SIGNAL, based on the UART number from gpio_sig_map.h
 #if SOC_UART_NUM > 2
-#define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : (uartNumber == UART_NUM_1 ? U1TXD_OUT_IDX : U2TXD_OUT_IDX))
+  #define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : (uartNumber == UART_NUM_1 ? U1TXD_OUT_IDX : U2TXD_OUT_IDX))
+  #define UART_RX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0RXD_IN_IDX : (uartNumber == UART_NUM_1 ? U1RXD_IN_IDX : U2RXD_IN_IDX))
 #else
-#define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : U1TXD_OUT_IDX)
+  #define UART_TX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0TXD_OUT_IDX : U1TXD_OUT_IDX)
+  #define UART_RX_SIGNAL(uartNumber) (uartNumber == UART_NUM_0 ? U0RXD_IN_IDX : U1RXD_IN_IDX)
 #endif
 /*
-   Make sure UART's RX signal is connected to TX pin
-   This creates a loop that lets us receive anything we send on the UART
+   This function internally binds defined UARTs TX signal with defined RX pin of any UART (same or different).
+   This creates a loop that lets us receive anything we send on the UART without external wires.
 */
 void uart_internal_loopback(uint8_t uartNum, int8_t rxPin)
 {
@@ -1008,4 +1010,4 @@ int uart_send_msg_with_break(uint8_t uartNum, uint8_t *msg, size_t msgSize)
   return uart_write_bytes_with_break(uartNum, (const void *)msg, msgSize, 12);
 }
 
-#endif /* SOC_UART_SUPPORTED */
+#endif /* SOC_UART_SUPPORTED */

tests/uart/test_uart.py

@@ -0,0 +1,2 @@
+def test_uart(dut):
+    dut.expect_unity_test_output(timeout=120)