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Hello, I am trying to initialise the CAN interface on a C164 - I need to set the XPEN bit, and clear the CAN1DIS bit in the SYSCON register. However, I am using C, and thus C_STARTUP_CODE is loaded into RAM, which contains the EINIT instruction (which locks down access to SYSCON). Therefore, EINIT has already been executed by the time my main() starts, and so I cannot access this register. I'm having trouble interpreting the machine code on the reset vectors too, so I can't just put a JumpToHere, JumpToThere, sequence in. Any help would be much appreciated.
Sorry, cancel that last comment re: RS232.
During build-time, it seems like the only file the build-process needs is one called C167S.LIB, and putting deliberate errors into the START*.A66 files does nothing. When I open C167S.LIB, I can see the text "C_STARTUP_CODE", so I assume I have to change the source of this file, and then compile it (?) again. The EINIT command it definitely contained within this C_STARTUP stuff, as I can see from the .M66 file. Perhaps the settings for SYSCON are too?