Merge pull request #10328 from kjbracey-arm/stdio_serial_option

Add option to disable default UART console

Author: Cruz Monrreal

platform/mbed_lib.json

@@ -12,12 +12,12 @@
         },
 
         "stdio-buffered-serial": {
-            "help": "Use UARTSerial driver to obtain buffered serial I/O on stdin/stdout/stderr. If false, unbuffered serial_getc and serial_putc are used directly.",
+            "help": "(Applies if target.console-uart is true.) Use UARTSerial driver to obtain buffered serial I/O on stdin/stdout/stderr. If false, unbuffered serial_getc and serial_putc are used directly.",
             "value": false
         },
 
         "stdio-baud-rate": {
-            "help": "Baud rate for stdio",
+            "help": "(Applies if target.console-uart is true.) Baud rate for stdio",
             "value": 9600
         },
 

platform/mbed_retarget.cpp

@@ -261,7 +261,7 @@ MBED_WEAK FileHandle *mbed::mbed_override_console(int fd)
 
 static FileHandle *default_console()
 {
-#if DEVICE_SERIAL
+#if MBED_CONF_TARGET_CONSOLE_UART && DEVICE_SERIAL
 #  if MBED_CONF_PLATFORM_STDIO_BUFFERED_SERIAL
     static UARTSerial console(STDIO_UART_TX, STDIO_UART_RX, MBED_CONF_PLATFORM_STDIO_BAUD_RATE);
 #   if   CONSOLE_FLOWCONTROL == CONSOLE_FLOWCONTROL_RTS
@@ -274,7 +274,7 @@ static FileHandle *default_console()
 #  else
     static DirectSerial console(STDIO_UART_TX, STDIO_UART_RX, MBED_CONF_PLATFORM_STDIO_BAUD_RATE);
 #  endif
-#else // DEVICE_SERIAL
+#else // MBED_CONF_TARGET_CONSOLE_UART && DEVICE_SERIAL
     static Sink console;
 #endif
     return &console;

targets/targets.json

@@ -15,6 +15,10 @@
         "bootloader_supported": false,
         "static_memory_defines": true,
         "config": {
+            "console-uart": {
+                "help": "Target has UART console on pins STDIO_UART_TX, STDIO_UART_RX. Value is only significant if target has SERIAL device.",
+                "value": true
+            },
             "console-uart-flow-control": {
                 "help": "Console hardware flow control. Options: null, RTS, CTS, RTSCTS.",
                 "value": null