micropython-issp

Now you can program a Cypress PSoC1 device from a PyBoard!

Overview

To program a PSoC1 device, in general follow these steps:

1. Prepare hardware. Refer to Cypress's ISSP Programming Specification document for the required connections. At the very least, you need 2 GPIOs for SCLK and SDATA, and one additional GPIO either connected to XRES or controlling the target's power. Make sure to use 5V-tolerant GPIO pins if the target is powered by 5V.

2. Edit issp.py to match the hardware resources used.

3. On a computer, use intelhex.py to convert the .hex file produced by PSoC Designer into a binary file.

4. Copy issp.py and the binary program file to the PyBoard.

5. Connect the PyBoard to the target device and your computer. Open a REPL terminal to the PyBoard.

6. Put the target in programming mode using either issp.reset() or issp.power_cycle_init, and verify its silicon ID with issp.read_id_word().

7. Read program data into memory, and program it into the target with issp.program() or issp.patch().

8. Verify the result with issp.verify().