freertos: HAVE_FREERTOS_INCLUDE_PREFIX if FreeRTOS headers are in 'freertos' folder, update esp32 config to use it

CHANGELOG.md

@@ -12,6 +12,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - gatt_client: emit query complete event for signed write operation
 - btstack_tlv_flash_bank: support targets where a value cannot be overwritten with zero. When ENABLE_TLV_FLASH_EXPLICIT_DELETE_FIELD
   is defined, an explicit delete field is used to indicate an invalid entry.
+- FreeRTOS: use freertos/.. prefix to include FreeRTOS headers if HAVE_FREERTOS_INCLUDE_PREFIX is defined
 
 ### Fixed
 - SM: Use provided authentication requirements in slave security request

doc/manual/docs/how_to.md

@@ -51,6 +51,12 @@ Embedded platform properties:
 HAVE_EMBEDDED_TIME_MS              | System provides time in milliseconds
 HAVE_EMBEDDED_TICK                 | System provides tick interrupt
 
+FreeRTOS platform properties:
+
+\#define                           | Description
+-----------------------------------|------------------------------------
+HAVE_FREERTOS_INCLUDE_PREFIX       | FreeRTOS headers are in 'freertos' folder (e.g. ESP32's esp-idf)
+
 POSIX platform properties:
 
 \#define                            | Description

platform/freertos/btstack_run_loop_freertos.c

@@ -50,14 +50,22 @@
 #include "btstack_linked_list.h"
 #include "btstack_debug.h"
 #include "btstack_run_loop_freertos.h"
+#include "hal_time_ms.h"
 
-// #include "hal_time_ms.h"
-uint32_t hal_time_ms(void);
+// some SDKs, e.g. esp-idf, place FreeRTOS headers into an 'freertos' folder to avoid name collisions (e.g. list.h, queue.h, ..)
+// wih this flag, the headers are properly found
 
+#ifdef HAVE_FREERTOS_INCLUDE_PREFIX
 #include "freertos/FreeRTOS.h"
 #include "freertos/task.h"
 #include "freertos/queue.h"
 #include "freertos/event_groups.h"
+#else
+#include "FreeRTOS.h"
+#include "task.h"
+#include "queue.h"
+#include "event_groups.h"
+#endif
 
 typedef struct function_call {
     void (*fn)(void * arg);

port/esp32/components/btstack/include/btstack_config.h

@@ -10,6 +10,7 @@
 #define HAVE_MALLOC
 #define HAVE_BTSTACK_STDIN
 #define HAVE_FREERTOS_TASK_NOTIFICATIONS
+#define HAVE_FREERTOS_INCLUDE_PREFIX
 
 // BTstack features that can be enabled
 #define ENABLE_BLE