SPI clock comment for M0 #59
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This is only a comment addition to help troubleshooting. Modern chips are fine with 25 MHz SPI clock, but the older M0 needs 12 MHz or less with the FeatherWings TFTs microSD cards. ``` +---------------------+--------+--------+--------+ | Chip | 25 MHz | 12 MHz | 8 MHz | +---------------------+--------+--------+--------+ | Feather M0 WINC1500 | x | o | o | | Feather ESP32 V2 | o | o | o | | Feather M0 Express | x | o | o | +---------------------+--------+--------+--------+ ```
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@mikeysklar can we just change it to be 12MHz? thats plenty fast |
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There is a comment in the code that ESP32 requires 25 MHz SPI. I'll try a few boards just to confirm everything runs @ 12 MHz. |
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12 MHz SPI speed worked fine with the ESP32-V2 and M0-Basic. Closing this PR which was only a comment change and will submit a new one to include @BlitzCityDIY changes to example code today. |
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This is only a comment addition to help troubleshooting. Modern chips are fine with 25 MHz SPI clock, but the older M0 needs 12 MHz or less with the FeatherWings TFTs microSD cards.
Changing the default example clock from 25 --> 12 helped resolve a forum issue with the Feather M0 <--> FeatherWing 3.5" HX8357.
Most of the breakouts use 10 MHz for wire length accomidation.