esp_wifi: Add API to get available internal heap size

components/esp32/esp_adapter.c

@@ -555,7 +555,7 @@ wifi_osi_funcs_t g_wifi_osi_funcs = {
     ._task_get_max_priority = task_get_max_priority_wrapper,
     ._malloc = malloc,
     ._free = free,
-    ._get_free_heap_size = esp_get_free_heap_size,
+    ._get_free_heap_size = esp_get_free_internal_heap_size,
     ._rand = esp_random,
     ._dport_access_stall_other_cpu_start_wrap = esp_dport_access_stall_other_cpu_start_wrap,
     ._dport_access_stall_other_cpu_end_wrap = esp_dport_access_stall_other_cpu_end_wrap,

components/esp32/include/esp_system.h

@@ -130,6 +130,16 @@ uint32_t system_get_time(void)  __attribute__ ((deprecated));
   */
 uint32_t esp_get_free_heap_size(void);
 
+/**
+ * @brief  Get the size of available internal heap.
+ *
+ * Note that the returned value may be larger than the maximum contiguous block
+ * which can be allocated.
+ *
+ * @return Available internal heap size, in bytes.
+ */
+uint32_t esp_get_free_internal_heap_size(void);
+
 /** @cond */
 /**
   * @brief  Get the size of available heap.

components/esp32/system_api.c

@@ -338,6 +338,11 @@ uint32_t esp_get_free_heap_size( void )
     return heap_caps_get_free_size( MALLOC_CAP_DEFAULT );
 }
 
+uint32_t esp_get_free_internal_heap_size( void )
+{
+    return heap_caps_get_free_size( MALLOC_CAP_8BIT | MALLOC_CAP_DMA | MALLOC_CAP_INTERNAL );
+}
+
 uint32_t esp_get_minimum_free_heap_size( void )
 {
     return heap_caps_get_minimum_free_size( MALLOC_CAP_DEFAULT );