How can the IO3 port of the rak4631/4630 output the system clock signal？
I don’t think that is possible.
If I do not output the system clock, but use the software code to output a clock at the IO3 pin that is lower than the system clock frequency, do you have any suggestions or solutions?
By software you will be very limited in the frequency and it will only work while nothing else is running in the application.
Please explain what you want to do with the clock output on a GPIO.
In the circuit, the ADC clock pin is connected to the IO pin of RAK4631, so I want to output an 8MHz clock through the IO3 pin as the ADC clock.
In my opinion that is not possible.
Why is the clock of an ADC connected to a GPIO? Makes no sense.
What ADC is that? Chip?
ADC is Microchip Technology Inc. 's MCP3564. Can I use a software timer to generate a clock of MHz magnitude
Can I pin fly wire to IO3 in I2C1_CLK instead of IO3 output clock？
I2C CLK is only active during I2C data transmission.
From the datasheet of the MCP3564, it should not require an external clock, you can run it with its internal clock.
But I don’t know that chip, you have to find out by yourself.
Anyway, creating a 4 or 8 MHz clock from an GPIO will not work. If you need an external 8Mhz clock, you need to provide it from a TCXO or similar clock generator.
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