General Purpose Flash Memory General Purpose Flash Memory commands
XBee®/XBee-PRO SX RF Module User Guide
174
Field name Command-specific description
GPM_CMD_ID Should be set to ERASE_RESPONSE (0x81).
GPM_STATUS A 1 in the least significant bit indicates an error occurred. All
other bits are reserved at this time.
GPM_BLOCK_NUM Matches the parameter passed in the request frame.
GPM_START_INDEX Matches the parameter passed in the request frame.
GPM_NUM_BYTES The number of bytes in the GPM_DATA field. For this command,
this field will be set to 0.
GPM_DATA No data bytes are specified for this command.
Example
To erase flash block 42 of a target radio with serial number of 0x0013a200407402ac format an ERASE
packet as follows (spaces added to delineate fields):
7E 001C 11 01 0013A200407402AC FFFE E6 E6 0023 C105 00 C0 01 00 002A 0000 0200 37
Assuming all transmissions were successful, the following API packets would be output the source
node's serial interface:
7E 0007 8B 01 FFFE 00 00 00 76
7E 001A 91 0013A200407402AC FFFE E6 E6 0023 C105 C1 81 00 002A 0000 0000 39
WRITE (0x02) and ERASE_THEN_WRITE (0x03)
The WRITE command writes the specified bytes to the GPM location specified. Before writing bytes to
a GPM block it is important that the bytes have been erased previously. The ERASE_THEN_WRITE
command performs an ERASE of the entire GPM block specified with the GPM_BLOCK_NUM field prior
to doing a WRITE.
Field name Command-specific description
GPM_CMD_ID Should be set to WRITE (0x02) or ERASE_THEN_WRITE (0x03).
GPM_OPTIONS There are currently no options defined for this command. Set this
field to 0.
GPM_BLOCK_NUM Set to the index of the GPM block that should be written.
GPM_START_INDEX Set to the byte index within the GPM block where the given data
should be written.
GPM_NUM_BYTES Set to the number of bytes specified in the GPM_DATA field.
Only one GPM block can be operated on per command. For this
reason, GPM_START_INDEX + GPM_NUM_BYTES cannot be
greater than the GPM block size. The number of bytes sent in an
explicit API frame (including the GPM command fields) cannot
exceed the maximum payload size of the device. The maximum
payload size can be queried with the NP command.
GPM_DATA The data to be written.
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