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Add 'SUMP Logic Analyzer mode'

Triss 2021-07-30 17:14:21 +00:00
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SUMP-Logic-Analyzer-mode.md Normal file

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Mode 4 provides a SUMP/OLS-compatible logic analyzer interface, usable with sigrok/PulseView etc.
## Pinout
### Raspberry Pico
On the Raspberry Pico, 16 channels are available:
| Pin number | Usage | Usage | Pin number |
|:---------- |:-------------- | --------------:| ----------:|
| GP0 | stdio UART TX | | VBUS |
| GP1 | stdio UART RX | | VSYS |
| GND | <ground> | <ground> | GND |
| GP2 | | | 3V3 EN |
| GP3 | | | 3V3 OUT |
| GP4 | | | ADC VREF |
| GP5 | | | GP28 / ADC2|
| GND | <ground> | <ground> | GND / AGND|
| GP6 | Channel 0 | | GP27 / ADC1|
| GP7 | Channel 1 | | GP26 / ADC0|
| GP8 | Channel 2 | | RUN |
| GP9 | Channel 3 | Test PWM signal| GP22 |
| GND | <ground> | <ground> | GND |
| GP10 | Channel 4 | Channel 15 | GP21 |
| GP11 | Channel 5 | Channel 14 | GP20 |
| GP12 | Channel 6 | Channel 13 | GP19 |
| GP13 | Channel 7 | Channel 12 | GP18 |
| GND | <ground> | <ground> | GND |
| GP14 | Channel 8 | Channel 11 | GP17 |
| GP15 | Channel 9 | Channel 10 | GP16 |
| <end>| <bottom> | <bottom> | <end>|
The implementation has been lifted from [picoprobe-sump](https://github.com/perexg/picoprobe-sump), for which we thank the author a lot.
## Usage
### sigrok-cli
```
sigrok-cli --driver=ols:conn=/dev/ttyACM0 --config samplerate=50Mhz --samples 256 --channels 0-1
```
### PulseView
Select the "Openbench Logic Sniffer" as probe type, select serial connection, where the device should show up. Any baudrate should work.
Alternatively,
```
pulseview --driver=ols:conn=/dev/ttyACM0
```