add pio example for 7_segment display#375

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mjcross wants to merge 4 commits intoraspberrypi:developfrom

mjcross:add-pio-7_segment

Commits on May 5, 2023

add pio example for 7_segment display
mjcross
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Commits on Jun 1, 2023

limit SM clock divider to 16bit max
mjcross
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Reverse edit to wrong file
mjcross
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limit SM clock divider to 16bit max (correct file this time)
mjcross
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