Advanced application features Over-the-air firmware updates
XBee® SX 868 RF Module User Guide
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Send the contents of the .ebin file to the target device using general purpose memory WRITE
commands. Erase the entire GPM prior to beginning an upload of an .ebin file. The contents of the
.ebin file should be stored in order in the appropriate GPM memory blocks. The number of bytes that
are sent in an individual GPM WRITE frame is flexible and can be catered to the user application.
Example
The example firmware version has an .ebin file of 55,141 bytes in length. Based on network traffic, we
determine that sending a 128 byte packet every 30 seconds minimizes network disruption. For this
reason, you would divide and address the .ebin as follows:
GPM_BLOCK_NUM GPM_START_INDEX GPM_NUM_BYTES .ebin bytes
0 0 128 0 to 127
0 128 128 128 to 255
0 256 128 256 to 383
0 384 128 384 to 511
1 0 128 512 to 639
1 128 128 640 to 767
- - - -
- - - -
- - - -
107 0 54784 to 54911
107 128 54912 to 55039
107 256 101 55040 to 55140
Verify the new application
For an uploaded application to function correctly, every single byte from the .ebin file must be
properly transferred to the GPM. To guarantee that this is the case, GPM VERIFY functions exist to
ensure that all bytes are properly in place. The FIRMWARE_VERIFY function reports whether or not the
uploaded data is valid. The FIRMWARE_VERIFY_AND_INSTALL command reports if the uploaded data
is invalid. If the data is valid, it begins installing the application. No installation takes place on invalid
data.
Install the application
When the entire .ebin file is uploaded to the GPM of the target node, you can issue a FIRMWARE_
VERIFY_AND_INSTALL command. Once the target receives the command it verifies the .ebin file
loaded in the GPM. If it is valid, then the device installs the new firmware. This installation process can
take up to eight seconds. During the installation the device is unresponsive to both serial and RF
communication. To complete the installation, the target module resets. AT parameter settings which
have not been written to flash using the WR command will be lost.
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