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      Paul L replied to the thread I2C startup issue.
      Problem resolved. I decided to shotgun the problem and just start removing components. The issue was caused by one of the daughter boards in my system. So while I don’t know the root cause yet, I plan to leave the offending board unplugged and...
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      Paul L replied to the thread I2C startup issue.
      I connected a thicker ground wire to the ground between 3.3v and 5V, then to the first ground pin on the other side, then to the another ground, one at a time with no success. Installed a new Teensy 4.1, with the same result. Measure the...
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      Paul L replied to the thread I2C startup issue.
      maybe “start up” wasn’t the right word. The issue happens at the start of every one second loop. Another thing I noticed is that SDA looks fine, only SCL has the ramping issue, as shown below:
      • IMG_2903.jpeg
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      Paul L replied to the thread I2C startup issue.
      I'm using 2K pull up resistors. This simplified code exhibits the same issue, though I'm not sure it's the code (though I've been wrong before): #include <Arduino.h> #include <i2c_device.h> enum class Switch_Digital : uint16_t { Address =...
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      I’m having communication errors with the first I transmission. If I immediately send the same message again it is fine. I noticed that the signal isn’t pulled down properly at first. Here is a screenshot: I’ve checked for grounding issues...
      • IMG_2901.jpeg
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      Paul L replied to the thread Project: SPI_MSTransfer.
      EDIT: SPI communication is working. There may be somthing else going on non-teensy related. The warnings below sent me down the rabbit hole. SPI communication stopped working on my project, even after I reverted the code back to a known...
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