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11 FIRMWARE UPGRADE
110 Copernicus GPS Receiver
4. Establish a serial port connection to the target in the Monitor mode.
Once the target enters the monitor mode, it changes the GPS receiver’s serial
port settings to 38400 baud (port A) or 4800 baud (port B), 8 data bits, 1 stop
bit, and no parity. To establish communication to the target in the monitor
mode, the local host’s settings must be changed to the same value, and the ENQ
packet sent to the target. The target will respond with ACK to indicate the
communication has been established. Refer to Section ENQ, ACK, NAK for
details on this packet.
5. Change baud rate for faster loading.
If the local host’s hardware can support higher baud rates, it is better to change
the baud rate to maximum possible for the fastest loading time. First send
“Change Baud” Monitor Mode packet 0x86 to the target with the desired baud
rate. See page 113 for details on this packet. Wait 0.5 seconds to let the packet
be transmitted, change the local baud rate to the same settings, and send ENQ
packet to the target. The target will respond with ACK at the new baud rate to
indicate the communication has been established.
6. Erase firmware section.
Before the firmware can be programmed, the GPS firmware section in Flash
must be erased. The “Erase Firmware Section” Monitor Mode packet 0x8F
must be sent to the target. The target will respond with ACK when the section
is erased. See page page 113 for details on this packet.
7. Send size and start address of the firmware.
In this step, the size and start (base) address of the firmware is sent to the target
using the “Start Firmware Programming” Monitor Mode packet 0x8B. This
packet initiates the firmware loading process. The target will respond with
ACK as soon as this packet is received. See page 114 for details on this packet.
8. Send firmware data.
Once the “Start Firmware Programming” packet is sent, the target expects a
stream of 2-byte words. The host must send this data one word at a time, with
the most significant byte of each word sent first. There is no protocol
formatting for this data stream. For faster loading, data can be sent up to 200
bytes at a time. Note that whatever the size, it must be a multiple of 2 bytes.
See Appendix A for example source code, which shows how this is done. Once
the target received and programmed all of the data into Flash, it will send ACK
to indicate success. If NAK is received, an error occurred, and the process must
be repeated from Step 6.
9. Restart the target.
Once firmware loading is complete, the “Restart Target” Monitor Mode packet
0x8C should be issued to reset the GPS receiver. Upon reset, the new firmware
will start up. See page 115 for details on this packet.