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      greg replied to the thread SPI library on T4.0.
      Thanks all! Upgraded to latest Arduino and Teensyduino. It all works as expected. Unrelated to Teensy, I did realize I can not use MCP4151 or any other DigiPot I could find to replace an analog pot on a 3v-12v adjustable power voltage reg...
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      greg replied to the thread SPI library on T4.0.
      Thanks, guys. Sorry, to clarify, I am on Arduino 1.8.19 This is what I see in the verbose compile output: Using library SPI at version 1.0 in folder: C:\Dev\arduino-1.8.19\hardware\teensy\avr\libraries\SPI Just wanted to make sure the above...
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      Hi, Trying to get an MCP4151 digital pot ((https://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf) working with T4 to control a resistor on an adjustable voltage reg, thus making it programmatically settable. 6 hours of poking around...
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