feat(freertos): Make trace facility configurable

This commit makes configUSE_TRACE_FACILITY and configUSE_STATS_FORMATTING_FUNCTIONS
configurable in kconfig.

Closes #495

Author: wujiangang

components/freertos/Kconfig

@@ -76,4 +76,21 @@ config ENABLE_FREERTOS_SLEEP
 
         The module is not working now, so if users want to make it work, they should do this themselves. 
 
+config FREERTOS_USE_TRACE_FACILITY
+    bool "Enable FreeRTOS trace facility"
+    default n
+    help
+        If enabled, configUSE_TRACE_FACILITY will be defined as 1 in FreeRTOS.
+        This will allow the usage of trace facility functions such as
+        uxTaskGetSystemState().
+
+config FREERTOS_USE_STATS_FORMATTING_FUNCTIONS
+    bool "Enable FreeRTOS stats formatting functions"
+    depends on FREERTOS_USE_TRACE_FACILITY
+    default n
+    help
+        If enabled, configUSE_STATS_FORMATTING_FUNCTIONS will be defined as 1 in
+        FreeRTOS. This will allow the usage of stats formatting functions such
+        as vTaskList().
+
 endmenu

components/freertos/port/esp8266/include/freertos/FreeRTOSConfig.h

@@ -59,8 +59,7 @@
 #define configMINIMAL_STACK_SIZE	( ( unsigned short ) 768 )
 //#define configTOTAL_HEAP_SIZE		( ( size_t ) ( 17 * 1024 ) )
 #define configMAX_TASK_NAME_LEN		( 16 )
-#define configUSE_TRACE_FACILITY	0
-#define configUSE_STATS_FORMATTING_FUNCTIONS 0
+
 #define configUSE_16_BIT_TICKS		0
 #define configIDLE_SHOULD_YIELD		1
 
@@ -137,5 +136,13 @@ NVIC value of 255. */
 #define configUSE_QUEUE_SETS 1
 #endif
 
+#ifdef CONFIG_FREERTOS_USE_TRACE_FACILITY
+#define configUSE_TRACE_FACILITY        1       /* Used by uxTaskGetSystemState(), and other trace facility functions */
+#endif
+
+#ifdef CONFIG_FREERTOS_USE_STATS_FORMATTING_FUNCTIONS
+#define configUSE_STATS_FORMATTING_FUNCTIONS    1   /* Used by vTaskList() */
+#endif
+
 #endif /* FREERTOS_CONFIG_H */