Fix build with IDF 4 based Arduino cores

Author: h2zero

src/nimble/esp_port/port/include/esp_nimble_mem.h

@@ -13,13 +13,52 @@
 extern "C" {
 #endif
 
+#if ESP_IDF_VERSION_MAJOR >= 5
 // #pragma message "This file should be replaced with bt_osi_mem.h, used here for compatibility"
 
 #include "bt_osi_mem.h"
 #define nimble_platform_mem_malloc bt_osi_mem_malloc
 #define nimble_platform_mem_calloc bt_osi_mem_calloc
 #define nimble_platform_mem_free bt_osi_mem_free
 
+#else
+
+#include "esp_attr.h"
+#include "esp_heap_caps.h"
+#include "nimconfig.h"
+#include "../include/esp_nimble_mem.h"
+
+IRAM_ATTR void *nimble_platform_mem_malloc(size_t size)
+{
+#ifdef CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_INTERNAL
+    return heap_caps_malloc(size, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
+#elif CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_EXTERNAL
+    return heap_caps_malloc(size, MALLOC_CAP_SPIRAM|MALLOC_CAP_8BIT);
+#elif CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_IRAM_8BIT
+    return heap_caps_malloc_prefer(size, 2, MALLOC_CAP_INTERNAL|MALLOC_CAP_IRAM_8BIT, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
+#else
+    return malloc(size);
+#endif
+}
+
+IRAM_ATTR void *nimble_platform_mem_calloc(size_t n, size_t size)
+{
+#ifdef CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_INTERNAL
+    return heap_caps_calloc(n, size, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
+#elif CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_EXTERNAL
+    return heap_caps_calloc(n, size, MALLOC_CAP_SPIRAM|MALLOC_CAP_8BIT);
+#elif CONFIG_BT_NIMBLE_MEM_ALLOC_MODE_IRAM_8BIT
+    return heap_caps_calloc_prefer(n, size, 2, MALLOC_CAP_INTERNAL|MALLOC_CAP_IRAM_8BIT, MALLOC_CAP_INTERNAL|MALLOC_CAP_8BIT);
+#else
+    return calloc(n, size);
+#endif
+}
+
+IRAM_ATTR void nimble_platform_mem_free(void *ptr)
+{
+    heap_caps_free(ptr);
+}
+
 #ifdef __cplusplus
 }
 #endif