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Add function to get the currently selected ADC channel #451

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Merged
kilograham merged 1 commit into from
May 27, 2021
Merged

Add function to get the currently selected ADC channel #451

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9 changes: 9 additions & 0 deletions src/rp2_common/hardware_adc/include/hardware/adc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,15 @@ static inline void adc_select_input(uint input) {
hw_write_masked(&adc_hw->cs, input << ADC_CS_AINSEL_LSB, ADC_CS_AINSEL_BITS);
}

/*! \brief Get the currently selected ADC input channel
* \ingroup hardware_adc
*
* \return The currently selected input channel. 0...3 are GPIOs 26...29 respectively. Input 4 is the onboard temperature sensor.
*/
static inline uint adc_get_selected_input(void) {
return (adc_hw->cs & ADC_CS_AINSEL_BITS) >> ADC_CS_AINSEL_LSB;
}

/*! \brief Round Robin sampling selector
* \ingroup hardware_adc
*
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