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Success burning a PIC 4550 using a Raspberry pi with the burnLVP python project.

See https://github.com/danjperron/burnLVP

Since a Pi GPIO has 3.3 V signals and 5V supply is required for bulk-erase of chip, we need a converter betw 3.3V and 5V.

Needs to be bi-directional for the data-pin. A single transistor circuit level shifter worked, as described in http://electronics.stackexchange.com/questions/82104/single-transistor-level-up-shifter or http://elinux.org/RPi_GPIO_Interface_Circuits. Also worth a look is http://tansi.info/rp/interfacing5v.html

See schecmatic below :

connections for burning 4550 from pi. Level conversion is needed.