Add clock_configure_mhz function #2244
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Trades off accuracy (only gets to +/- 1MHz) for reduced code size as it doesn't need 64 bit division
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As per new code in #2225 we should catch cases where the divider between 1 and 2. |
kilograham
reviewed
Feb 7, 2025
| * \ingroup hardware_clocks | ||
| * | ||
| * This function differs from clock_configure in that it does not configure the clocks as accurately, | ||
| * but therefore doesn't need to bring in 64-bit division functions, reducing the code size. |
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reducing code size if 64-bit division is not otherwise used by the application
I guess that means you can't overclock the Pico to 66 GHz? 🤣 |
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This adds a
clock_configure_mhzfunction, which trades off accuracy compared toclock_configure(only gets to +/- 1MHz) for reduced code size as it doesn't need 64 bit division.It takes the source and target frequencies in MHz as 16-bit numbers, to ensure they fit within the 32-bit division.
This is useful for example if you want to calibrate the ROSC using an XOSC and then run off the ROSC, in which case you don't need a very accurate frequency as the ROSC frequency isn't accurate.