More trueposition commands #7
Conversation
Signed-off-by: Michal Demin <[email protected]>
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I have RE'd the firmware from the GPSDO and i have updated the documentation for the commands. There are few i don't know what they are doing. And i don't feel like reversing advanced math in NIOS assembler :-). |
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Most interesting commands are $EBG and $F, which can be used to communicate with the GPS module. Beware that the serial line speed is 9600. GPS module to FPGA communication switches to 38400, but there is no command to change baudrate on the other communication port. There is third serial port, but this one is debug only - so called jtag_uart - NIOS speciality, accessible over JTAG only. |
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Good to see more commands added to the list. Disassembly is the definitive method. ( I got what I did the slow way, by just looking at strings in a firmware dump posted online, and guessing at meanings) |
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strings in the firmware are just reply strings, command handler is very dumb, it checks 3 bytes of command .... GETPOS is same as GxxPxS, so i had to find the command handler function to get all commands :) ... good thing that the code is not huge |
Signed-off-by: Michal Demin <[email protected]>
Signed-off-by: Michal Demin [email protected]