support frequency=0
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@ -97,7 +97,7 @@ public:
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sm_config_set_out_shift(&c, out_shift_right, auto_pull, pull_threshold);
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double div = clock_get_hz(clk_sys) / frequency;
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double div = frequency ? clock_get_hz(clk_sys) / frequency : 1.0;
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sm_config_set_clkdiv(&c, div);
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pio_sm_init(pio, sm, offset, &c);
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