Over the last year or so we’ve noticed a definite uptick in the number of folks using OpenOCD on the Raspberry Pi. It’s a cheap and convenient solution for poking around with various microcontrollers and embedded devices, but not always the most elegant.
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Old MCUs from vendors like ATMEL and MICROCHIP, like the PIC16F and Atmega family, tend to have a special programming interface to program internal flash. For example, Atmega used SPI pins (MISO, MOSI, SCK) and PIC used two pins (PGC, PGD)— one as a clock and another as a bi-directional data line.
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JTAG is a physical hardware interface that makes it possible, among other things, to extract the firmware image from electronic devices.
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In JTAG Debugging the ESP32 with FT2232 and OpenOCD I have used a FTDI FT2232 breakout board to JTAG debug with OpenOCD. With an adapter board on top of the TDI FT2232 the wiring is much easier and simpler to use:
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