rp2/machine_adc: Only initialise the ADC periph if not already enabled.
Otherwise it resets the ADC peripheral each time a new ADC object is constructed, which can reset other state that has already been set up. See issue #6833. Signed-off-by: Damien George <damien@micropython.org>
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@ -78,7 +78,10 @@ STATIC mp_obj_t machine_adc_make_new(const mp_obj_type_t *type, size_t n_args, s
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}
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}
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// Initialise the ADC peripheral if it's not already running.
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if (!(adc_hw->cs & ADC_CS_EN_BITS)) {
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adc_init();
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}
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if (ADC_IS_VALID_GPIO(channel)) {
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// Configure the GPIO pin in ADC mode.
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