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High frequencies with small changes possible? #14

Answered by khoih-prog
peterbmarks asked this question in Q&A
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Hi @peterbmarks

Is the accuracy of the frequency a limitation of the PIO on the 2040?

That sounds interesting project, but your concern, IMHO, is more accurate than what the RP2040 can provide.

The TOP register to control PWM is only 16-bit, giving 64K resolution can't provide the 1.4648 Hz increments in MHz range (nearly 32-bit resolution)

I suggest you use the hardware solution, such as Si570 programmable crystal oscillator, as described in Standalone Multiband WSPR
beacon transmitter (MEPT)

The following is a design of a standalone MEPT beacon used for WSPR broadcasts [2]. It is
based on a Si570 programmable crystal oscillator (silabs.com) which is controlled by means of an
AVR atti…

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