53 lines
1.4 KiB
Markdown
53 lines
1.4 KiB
Markdown
Picoprobe with the logic analyzer implementation based on the SUMP protocol
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===========================================================================
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Supported features:
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- up to 16 probes (gpio 6-21 by default)
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- 200kB RAM for samples
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- RLE encoding
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- test mode (external pattern)
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* probe 0 and 1 - 10Mhz PWM
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* probe 1 and 2 - 1Mhz PWM
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* probe 3 and 4 - 1kHz PWM
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* probe 8 and 9 - 1kHz PWM (swapped levels)
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- test pin (gpio 22) - 5Mhz 50%/50% PWM for probe tests (activated only when sampling)
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Limits:
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- 50Mhz sampling rate when compiled with the TURBO_200MHZ define (otherwise 31.25Mhz)
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- basic triggers are implemented (functional up to 10Mhz - TODO: PIO support)
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This protocol is supported in sigrok as openbench-logic-sniffer:
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```
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pulseview --driver=ols:conn=/dev/ttyACM1
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sigrok-cli --driver=ols:conn=/dev/ttyACM1 --config samplerate=50Mhz \
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--config pattern=External --samples 256 --channels 0-1
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```
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Compile:
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```
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mkdir build
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cd build
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TURBO_200MHZ=1 PICO_SDK_PATH=/opt/pico-sdk cmake ..
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```
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Compile RAM code (debug):
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```
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mkdir build
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cd build
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TURBO_200MHZ=1 PICO_SDK_PATH=/opt/pico-sdk cmake -DPICO_NO_FLASH=1 -DCMAKE_BUILD_TYPE=Debug ..
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```
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Misc:
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- picoprobe reset pin is on gpio 28 (instead 6) now
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[Link to protocol](https://www.sump.org/projects/analyzer/protocol) |
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[Link to libsigrok](https://github.com/sigrokproject/libsigrok/tree/master/src/hardware/openbench-logic-sniffer)
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