M263: Support configurability for USB/STDIO UART pins

-   STDIO_UART and STDIO_UART_TX/STDIO_UART_RX
-   USB_UART and USBTX/USBRX

Author: ccli8

targets/TARGET_NUVOTON/TARGET_M261/PeripheralNames.h

@@ -19,6 +19,7 @@
 #define MBED_PERIPHERALNAMES_H
 
 #include "cmsis.h"
+#include "PinNames.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -80,7 +81,16 @@ typedef enum {
     UART_4 = (int) NU_MODNAME(UART4_BASE, 4, 0),
     UART_5 = (int) NU_MODNAME(UART5_BASE, 5, 0),
     // NOTE: board-specific
-    STDIO_UART  = UART_0
+#if defined(MBED_CONF_TARGET_USB_UART)
+    USB_UART    = MBED_CONF_TARGET_USB_UART,
+#else
+    USB_UART    = NC,
+#endif
+#if defined(MBED_CONF_TARGET_STDIO_UART)
+    STDIO_UART  = MBED_CONF_TARGET_STDIO_UART
+#else
+    STDIO_UART  = USB_UART
+#endif
 
 } UARTName;
 

targets/TARGET_NUVOTON/TARGET_M261/PinNames.h

@@ -113,10 +113,26 @@ typedef enum {
     // Other board-specific naming
 
     // UART naming
-    USBTX = PB_13,
-    USBRX = PB_12,
+#if defined(MBED_CONF_TARGET_USB_UART_TX)
+    USBTX           = MBED_CONF_TARGET_USB_UART_TX,
+#else
+    USBTX           = NC,
+#endif
+#if defined(MBED_CONF_TARGET_USB_UART_RX)
+    USBRX           = MBED_CONF_TARGET_USB_UART_RX,
+#else
+    USBRX           = NC,
+#endif
+#if defined(MBED_CONF_TARGET_STDIO_UART_TX)
+    STDIO_UART_TX   = MBED_CONF_TARGET_STDIO_UART_TX,
+#else
     STDIO_UART_TX   = USBTX,
+#endif
+#if defined(MBED_CONF_TARGET_STDIO_UART_RX)
+    STDIO_UART_RX   = MBED_CONF_TARGET_STDIO_UART_RX,
+#else
     STDIO_UART_RX   = USBRX,
+#endif
     SERIAL_TX = D1,
     SERIAL_RX = D0,
 

targets/targets.json

@@ -14732,6 +14732,30 @@
             "IAR"
         ],
         "config": {
+            "usb-uart": {
+                "help": "Configure USB_UART. USB_UART and USB_UART_TX/USB_UART_RX must be consistent.",
+                "value": null
+            },
+            "usb-uart-tx": {
+                "help": "Configure USBTX. USB_UART and USBTX/USBRX must be consistent.",
+                "value": null
+            },
+            "usb-uart-rx": {
+                "help": "Configure USBRX. USB_UART and USBTX/USBRX must be consistent.",
+                "value": null
+            },
+            "stdio-uart": {
+                "help": "Configure STDIO_UART. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART defaults to USB_UART.",
+                "value": null
+            },
+            "stdio-uart-tx": {
+                "help": "Configure STDIO_UART_TX. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART_TX defaults to USBTX.",
+                "value": null
+            },
+            "stdio-uart-rx": {
+                "help": "Configure STDIO_UART_RX. STDIO_UART and STDIO_UART_TX/STDIO_UART_RX must be consistent. STDIO_UART_RX defaults to USBRX.",
+                "value": null
+            },
             "gpio-irq-debounce-enable": {
                 "help": "Enable GPIO IRQ debounce",
                 "value": 0
@@ -14799,7 +14823,12 @@
         "device_name": "M263KIAAE",
         "detect_code": [
             "1310"
-        ]
+        ],
+        "overrides": {
+            "usb-uart": "UART_0",
+            "usb-uart-tx": "PB_13",
+            "usb-uart-rx": "PB_12"
+        }
     },
     "NUCLEO_G071RB": {
         "inherits": [