Design of RP2 Probe

The CPU RP2 Probe may be used to probe the DUT. Depending on the use case, one of the following firmwares may be used:

• picoprobe: debugprobe_on_pico.uf2/board_pico_config.h

• yapicoprobe: https://github.com/rgrr/yapicoprobe

• sigrok: https://github.com/pico-coder

• ula: https://github.com/dotcypress/ula

• Logicanalyzer: https://github.com/gusmanb/logicanalyzer

Assignment of the firmware features to the solder pads

GPIO	picoprobe	yapicoprobe	sigrok	ula channel (idx1)	logicanalyzer channel (idx1)
0	✗	✗	✗	ch 1	✗
1	✗	swd dir	✗	ch 2	✗
2	swd clk	swd clk	✗	ch 3	ch 1
3	swd dio	swd dio	✗	ch 4	ch 2
4	uart tx	uart tx	✗	ch 5	ch 3
5	uart rx	uart rx	✗	ch 6	ch 4
6	✗	swd reset	✗	ch 7	ch 5
7-9	✗	✗	✗	ch 8	ch 6-8
10-17	✗	digital 1-8	✓ (to be verified)	ch 11-16	ch 9-16
18-20	✗	✗	✗	✗	ch 17-19
21,22	✗	✗	✗	✗	ch 20,21
26-28	✗	analog 1-3	✓ (to be verified)	✗	ch 22-24

Notes

• GPIO 21,22 have no pads. Rationale: Limit pads to #24.

• Other firmware which might be used:

  • Bluetag: https://github.com/Aodrulez/blueTag

  • Micropython

Level shifter

Bereits verdrahtet:

• uart RX: DUT -> Probe

• uart TX: Probe -> DUT

• swd CLK: Probe -> DUT

• swd DIO: Probe <-> DUT

logicanalyzer * 4 channel DUT