DocID026337 Rev 1

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AN4491

Description

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Description

The updater is an independent program that resides within the BlueNRG device. It allows

changing of the BlueNRG firmware, by receiving a new version via serial port (SPI), and

reprogramming the Flash memory. The updater cannot change itself.

The updater is allocated in a section of the NVM (non-volatile-memory) of the device (Flash

or ROM). When the updater is in Flash, the first sector is used, i.e. 2 KB.

Figure 1. Flash within the BlueNRG, divided into 3 blocks: updater, firmware, data

As a separate program, the updater is be able to work without the BlueNRG firmware. Even

if the BlueNRG firmware is corrupted, or if the 62 KB firmware region and/or 2 KB IFR Flash

are completely empty, the updater is still able to turn on the system, wait to receive new

firmware, and then update the Flash. So it can safeguard the system and bring it back to a

known working state.