TLDR: Setup the circuit and run python program.py program.asm.
Provides an Arduino sketch and python script to program a PIC 16F627A from an asm file. May work with other chips that implement the same programming interface (628A/648A).
Only tested with linux, and likely to need at least minor tweaks to work with other platforms.
The arduino code's heavily based upon Soranne/Ronan Gaillard's PIC programming project, available at http://forum.arduino.cc/index.php?topic=92929.0. Note: the serial interface is NOT compatible with Soranne's client-side windows program, although it shouldn't be too hard to modify either to be so though.
See lights.asm for an example assemly file.
gpasm and gplink are required, and are available in the gputils on debian and variants.
See circuit.svg and circuit.jpg for a circuit diagram and photograph(the LEDs are not required for programming).
Connections:
- Pin 6 on arduino to RB6 on pic
- Pin 5 on arduino to RB7 on pic
- Pin 8 on arduino to VDD on pic
- Pin 7 on arduino to RB4 on pic
- Pin 3 on arduino to VPP on pic through a diode (allowing current from arduino -> pic, but not other way round)
- Pin 2 on arduino connected to gate of a n-channel MOSFET. Source connected to ground. Drain connected to 12V supply through a 1k resistor, and also VPP on pic through a diode (allowing current from arduino -> pic, but not other way round).
- Ground on arduino to VSS on PIC and ground of 12V supply.
Run
python program.py <filename> <serial port>
where <filename> is the name of the ASM/HEx file and <serial port> is the optional name of the serial port the Arduino is connected to.
The following commands are available through the serial interface
- b = Erase all program memory on chip (bulk erase)
- c = Move program counter to config memory (R to reset back to program memory)
- w = Write next word from serial to current program location
- r = Read word at current location and print over serial
- x = Put PIC into execution mode & run current program (R to reset back to programming mode)
- i = Increment program counter
- R = Reset PIC back to program memory, PC=0 & programming mode (same as on initial startup