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esp_bt_controller_mem_release() function
Release the Controller memory as per the mode This function releases the BSS, data and other sections of the Controller to heap. The total size is about 70 KB. If you never intend to use Bluetooth in a current boot-up cycle, calling `esp_bt_controller_mem_release(ESP_BT_MODE_BTDM)` could release the BSS and data consumed by both Classic Bluetooth and BLE Controller to heap. If you intend to use BLE only, calling `esp_bt_controller_mem_release(ESP_BT_MODE_CLASSIC_BT)` could release the BSS and data consumed by Classic Bluetooth Controller. You can then continue using BLE. If you intend to use Classic Bluetooth only, calling `esp_bt_controller_mem_release(ESP_BT_MODE_BLE)` could release the BSS and data consumed by BLE Controller. You can then continue using Classic Bluetooth.
Syntax
Implemented in ![]()
bt.c:1397
Return value
- ESP_OK: Success - ESP_ERR_INVALID_STATE: Invalid Bluetooth Controller state - ESP_ERR_NOT_FOUND: Requested resource not found
Notes
1. This function is optional and should be called only if you want to free up memory for other components. 2. This function should only be called when the Controller is in `ESP_BT_CONTROLLER_STATUS_IDLE` status. 3. Once Bluetooth Controller memory is released, the process cannot be reversed. This means you cannot use the Bluetooth Controller mode that you have released using this function. 4. If your firmware will upgrade the Bluetooth Controller mode later (such as switching from BLE to Classic Bluetooth or from disabled to enabled), then do not call this function.