tests: uart_async_api: Support atsamd21_xpro board

This commit adds the asynchronous UART API testing support on the SAM D21 Xplained Pro board. The SERCOM1 module is used as the secondary loop-back UART, which is required to run this test. Note that no external UART loop-back connection is necessary to run this test, because the SERCOM1 UART TX and RX pads are configured to be internally connected. Signed-off-by: Stephanos Ioannidis <[email protected]>
zephyrproject-rtos · Apr 23, 2020 · efa0e4b · efa0e4b
1 parent 6a55334
commit efa0e4b
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diff --git a/tests/drivers/uart/uart_async_api/boards/atsamd21_xpro.overlay b/tests/drivers/uart/uart_async_api/boards/atsamd21_xpro.overlay
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+&sercom1 {
+	/* Internally loop-back TX and RX on PAD0 */
+	rxpo = <0>;
+	txpo = <0>;
+
+	/* Configure DMA channels for async operation */
+	dmas = <&dmac 0 3>, <&dmac 1 4>;
+	dma-names = "rx", "tx";
+};
diff --git a/tests/drivers/uart/uart_async_api/src/test_uart.h b/tests/drivers/uart/uart_async_api/src/test_uart.h
@@ -23,6 +23,8 @@
 #define UART_DEVICE_NAME DT_UART_0_NAME
 #elif defined(CONFIG_BOARD_NRF9160DK_NRF9160)
 #define UART_DEVICE_NAME DT_UART_1_NAME
+#elif defined(CONFIG_BOARD_ATSAMD21_XPRO)
+#define UART_DEVICE_NAME DT_LABEL(DT_NODELABEL(sercom1))
 #else
 #define UART_DEVICE_NAME CONFIG_UART_CONSOLE_ON_DEV_NAME
 #endif