Replacing the Teensy 3.2 with 4.0 in the GQRP SCD Sudden Digital VFO
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Place holder for GQRP SCD Digital VFO Post The chip shortage has struck down the Teensy 3.2 which was used in the GQRP Digital VFO here: https://www.gqrp.com/suddenvfo.htm Obviously that's a problem. However, there is light at the end of the tunnel, the Teensy 4.0 is pin compatible so could be a drop in replacement. I downloaded the 'sketch' and tried to compile it, which failed with what looked like potentially simple to resolve errors and a *lot* of warnings about unused and uninitialised variables. The information below shows the changes I made to the V0_13 sketch and get a successful compile. Compiled for Teensy 4 using Arduino IDE: Version: 2.1.0 Date: 2023-04-19T15:31:10.185Z CLI Version: 0.32.2 Errors with unmodified sketch when compiled for Teensy 4 "Sorry, i2c_t3 only works on Teensy LC and 3.x. Use Wire for Teensy 4.0, 4.1, MicroMod." To fix: Change every instance of i2c_t3.h to wires.h In: SCD_2021_V0__13.ino Si5351.h Si5351.cpp To mop up s