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You can connect via the serial monitor and send ‘?’ to get a list of commands available. This allows some diagnostics when the board isn’t working with the OLS client. Sending ‘4’ does a 4MHz capture and ‘2’ dumbs the data buffer for example. Recommended to use this with the simulated signal via a timer. See the bottom of the setup() function and change the ‘#if 0’ to ‘#if 1’ to enable it. Also, fix a long standing bug that broke 2MHz captures and the ATmega168. (improper #if defined check)
74 lines
3.2 KiB
Plaintext
74 lines
3.2 KiB
Plaintext
SUMP compatible logic analyzer for Arduino
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==========================================
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This Arduino sketch implements a SUMP protocol compatible with the standard
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SUMP client as well as the alternative client from here:
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http://www.lxtreme.nl/ols/
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The alternative client version is highly recommended. Download version
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"ols-0.9.7" or newer for built-in device profiles.
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This SUMP protocol compatible logic analyzer for the Arduino board supports
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5 channels consisting of digital pins 8-12, which are the first 5 bits (0-4)
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of PORTB. Arduino pin 13 / bit 5 is the Arduino LED, bits 6 & 7 are the
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crystal oscillator pins.
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Uncomment CHAN5 below if you want to use the LED pin as an input and have
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6 channels.
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On the Arduino Mega board 8 channels are supported and 7k of samples.
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Pins 22-29 (Port A) are used by default.
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To use this with the original or alternative SUMP clients,
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use these settings:
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Sampling rate: 4MHz (or lower) (no 2MHz on ATmega168)
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Channel Groups: 0 (zero) only
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Recording Size:
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ATmega168: 532 (or lower)
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ATmega328: 1024 (or lower)
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ATmega2560: 7168 (or lower)
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Noise Filter: doesn't matter
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RLE: disabled (unchecked)
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Triggering is still a work in progress, but generally works for samples
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below 1MHz. 1MHz works for a basic busy wait trigger that doesn't store
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until after the trigger fires.
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Please try it out and report back.
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Older Notes
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===========================================================================
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NOTE: With v0.11 you can now sample at 4MHz & 2MHz rates in addition to the
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previous 1MHz and lower rates. This is done via unrolled loops which
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makes the source code huge and the binary takes much more of the flash.
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v0.11 is just slightly to big for an ATmega168's flash. You can comment
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out either captureInline2mhz() or captureInline4mhz() and it will fit.
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[ The code automatically skips the 2MHz code now, this isn't needed. ]
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NOTE: v0.09 switched the channels BACK to pins 8-13 for trigger reliability.
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Please report any issues. Uncomment USE_PORTD for pins 2-7.
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NOTE: The device profiles should be included with this code. Copy them to the
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'plugins' directory of the client. The location varies depending on the
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platform, but on the mac it is here by default:
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/Applications/LogicSniffer.app/Contents/Resources/Java/plugins
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[ These are included in ols-0.9.7 or newer so do not copy them. ]
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NOTE: If you are using the original SUMP client, then you will get a
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"device not found" error.
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You must DISABLE the Arduino auto reset feature to use this logic analyzer
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code. There are various methods to do this, some boards have a jumper,
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others require you to cut a trace. You may also install a *precisely*
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120 Ohm resistor between the reset & 5V piins. Make sure it is really
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120 Ohm or you may damage your board. It is much easier to use the
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alternative SUMP client referenced above.
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[ This is not needed with ols-0.9.7 or newer. ]
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[ DO NOT use this resistor unless absolutely necessary on old clients. ]
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NOTE: This master branch now supports Arduino 1.0 only.
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Checkout branch logic_analyzer_v0_5 for Arduino 22 support.
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Release: v0.13 February 7, 2015.
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