AN4486 datasheet(11/29 Pages) STMICROELECTRONICS

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AN4486

OTA bootloader service description

DocID026293 Rev 2

11/29

Where:

VECTOR_TABLE_BASE_DFU_OFFSET = 0x3000 (DFU size).

VECTOR_TABLE_BASE_RESET_MANAGER_OFFSET = 0x800 (Reset Manager size).

2.3

OTA bootloader service manager (standalone OTA

bootloader application)

A simpler approach coming from the BLE OTA service architecture described in Figure 2:

"BLE OTA service bootloader", consist of using a basic OTA Service Manager application

which only includes the BLE OTA service & characteristics.

Figure 4: BLE OTA Service Manager Flash layout

(1 ) It assumes DFU.hex application is on Flash base address 0x8000000.

The BLE OTA Service Manager architecture includes the following components:



Reset manager



This should start after reset and pass control to the latest updated & valid BLE

application.



OTA Service Manager



This contains only the BLE OTA service & characteristics and provides the OTA

bootloader capability to any BLE application.



New BLE application



This is the application image downloaded through the OTA Service Manager.



It does not require that the OTA bootloader service be included.



In order to use this capability, the BLE application must activate the OTA Service

Manager (a specific API Switch_To_OTA_Service_Manager_Application()

function is provided within btl.c file).



It is always placed at fixed Flash address: 0x8006800 .

2.3.1

Reset Manager

Refer to Section 2.2.1: "Reset Manager".

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