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This is the PIC18F25K50 firmware for Prog, a programmer for selected Microchip PIC16F, PIC18F and PIC32F microcomputers.The programmer is a PIC18F25K50 with associated circuitry that connects to a PC over USB and to the PIC to be programmed.It is controlled from the PC using theProg-Win command line utility, which readsHEX files. Typically the HEX file would have been generated by one of the(free) Microchip compilers.

+----------------+       +-------------+        +------------------------------+| Windows PC     |       | Programmer  |--Vdd-->| PIC16/18/32 to be programmed ||                |       |             |--Gnd-->|                              ||  prog-win.exe <---USB->| PIC25K50    |<-PGD-->|                              ||                |       | MAX680      |--PGC-->|                              |+----------------+       +-------------+  etc.. +------------------------------+

Note that the picture above illustrates the Prog chicken-and-egg problem; without access to a preprogrammed PIC18F25K50 youneed the programmer to program the programmer PIC.

The following PICs have been tested:

• PIC16F:
  • PIC16F628A
  • PIC16F648A
• PIC18F:
  • PIC18F2450
  • PIC18F2550
  • PIC18F4550
  • PIC18F25K50
  • PIC18F1330
• PIC32MX
  • PIC32MX150F128
  • PIC32MX220F032
  • PIC32MX250F128

...but any device using any of the five programming specifications should work. The specifications are Microchip documents:

• PIC16: DS41196E "PIC16F6xx/A EEPROM Programming Specification". This firmware implements the high-voltage In-Circuit Serial Programming (ICSP) specification.
• PIC18: DS39622F "Flash Microcontroller Programming Specification", DS41630B (with the same title) and DS39752B (with the same title). This firmware implements the high-voltage In-Circuit Serial Programming (ICSP) specification.
• PIC32: DS66145J "PIC32MX Flash Programming Specification". This firmware implements the 4-wire JTAG interface (not the 2-wire In-Circuit Serial Programming (ICSP) specification).

The following devices are covered by the specs:

• PIC16F627A
• PIC16LF627A
• PIC16F628A
• PIC16LF628A
• PIC16F648A
• PIC16LF648A
• PIC18F1230
• PIC18F1330
• PIC18F2221
• PIC18F2321
• PIC18F2410
• PIC18F2420
• PIC18F2450
• PIC18F24K50
• PIC18LF24K50
• PIC18F2455
• PIC18F2480
• PIC18F2510
• PIC18F2515
• PIC18F2520
• PIC18F2525
• PIC18F2550
• PIC18F25K50
• PIC18LF25K50
• PIC18F2580
• PIC18F2585
• PIC18F2610
• PIC18F2620
• PIC18F26K50
• PIC18LF26K50
• PIC18F2680
• PIC18F4221
• PIC18F4321
• PIC18F4410
• PIC18F4420
• PIC18F4450
• PIC18F45K50
• PIC18F4455
• PIC18F4480
• PIC18F4510
• PIC18F4515
• PIC18F4520
• PIC18F4525
• PIC18F4550
• PIC18LF45K50
• PIC18F4580
• PIC18F4585
• PIC18F4610
• PIC18F4620
• PIC18F46K50
• PIC18LF46K50
• PIC18F4680
• All PIC32MX devices

This repo is configured for MPLAB-X v3.55 (the free IDE from Microchip) and XC v1.41 (a C compiler with a free option).It uses the Microchip MCC v1.35.

The pins to connect to the device to be programmed are (in addition to GND):

The PIC18F25K50 connects to the PC over a USB cable. A MAX680 is used to pumpa 5V supply to the required Vpp 10V for PIC16 and PIC18. Only half of the MAX680is used; there's no need for a -10V.

For pure PIC32 programming the MAX680 and associated circuitry can be omitted.

Various bypass caps are not shown below; see the PIC18F25K50 documentation.

Windows 7 and up contain a generic USB driver sufficient for Prog. When the programmeris connected to the Windows PC and a driver is asked for, nominate the "windows driver"directory in this repo. This will trigger Windows to read the prog.inf file and usingthe information within configure the Prog hardware as a generic USB device. Oncesuccessful, the Prog-Win command line utility is used to work with the programmer.

There is currently no support for programming data EEPROM (read: semi-static RAM). There's no technical reason for why it could not be added, I just never needed it.

Sometimes, and in particular with long (>100mm) leads between the programmer and the chip to be programmed, the verification step may fail. Another try often helps. Shorter leads does too.

• Support for data EEPROM.