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<Screenshot 2024-07-08 at 11.06.29 AM.png>(From https://www.arduino.cc/reference/en/language/functions/communication/wire/endtransmission/)
With that context, I am seeing the following:
- without anything connected to the i2c bus, the script simply checks all the addresses, sees no errors or devices, and reports “no i2c devices”
- with an i2c cable connecting to an i2c device the script reports an error on every single address. I’ve tried two different devices as well as different cables.
I measured the voltage on the i2c connector and it is 3.3V (for the red and black power wires.)
In some places I see mention of a pull up resistor but I am pretty sure I have not needed that in the past.
Any theory/suggestions?
Thanks!
PIto
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Best Regards,
-- Sergei
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<Screenshot 2024-07-08 at 11.06.29 AM.png>(From https://www.arduino.cc/reference/en/language/functions/communication/wire/endtransmission/)With that context, I am seeing the following:- without anything connected to the i2c bus, the script simply checks all the addresses, sees no errors or devices, and reports “no i2c devices”- with an i2c cable connecting to an i2c device the script reports an error on every single address. I’ve tried two different devices as well as different cables.I measured the voltage on the i2c connector and it is 3.3V (for the red and black power wires.)In some places I see mention of a pull up resistor but I am pretty sure I have not needed that in the past.Any theory/suggestions?Thanks!PIto
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--Best Regards,-- Sergei--
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2. Use a more advanced I2C library - https://github.com/Richard-Gemmell/teensy4_i2c - it has a "Wire" wrapper if you don't want to do anything unusual.
My code is here, just in case: https://github.com/slgrobotics/Misc/blob/master/Arduino/Sketchbook/Teensy_PCA9685/PCA9685Emulation.cpp
// Teensy 4.0 Wire: SDA: 18 SCL: 19// Wire1: SDA: 17 SCL: 16
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void setup() { Serial.begin(38400); pinMode(8, INPUT_PULLUP); } void loop() { if (digitalRead(8) == HIGH) { Serial.println("Button is not pressed..."); } else { Serial.println("Button pressed!!!"); } delay(250); }
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> How about testing the SCL and SDA pins directly (as generic GPIO, LED Blink sketch) to see if they are alive?
Sounds interesting… But how would I do that?
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Pito...As a firmware programmer working on driver routines for the last 39 years I can't stress the importance of a logic analyzer.They are under $20.00 on ebay...some as low as $10.00...Stop wasting time with guessing and look at the signal.Daniel
On Wednesday, July 10, 2024 at 5:21:36 PM UTC-7 Dan wrote:
Pito...As a firmware programmer working on driver routines for the last 39 years I can't stress the importance of a logic analyzer.They are under $20.00 on ebay...some as low as $10.00...Stop wasting time with guessing and look at the signal.Daniel
As a systems engineering generalist for the past 30-ish years, I'm gonna cut a few milliseconds quicker to the chase and suggest this:
https://www.crowdsupply.com/excamera/i2cdriverThey also make one for SPI:
https://www.crowdsupply.com/excamera/spidriver
Those look really nice! More tools to order! Thanks.
sdw
Does it do everything a full-on Logic Analyzer or Oscilloscope does ?--No, it does not. It has no frequency range settings, it doesn't have triggers or sampling. It doesn't store presets.
What it does do though is enumerate the I2C devices plugged into it, gives you a little graph of the pulse-train and the voltage and current being used.Which tells you right away if the problem is with the device itself, or with your code or wiring.
Get the Analyzer like Dan is suggesting and then set aside a weekend to figure out how to really use it *after* you've solved your current I2C problem.
'dillo
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Stephen D.
Williams
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