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Add function to get the currently selected channel (#451)

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This is most useful in combination with round-robin sampling to avoid
having to track it manually.
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Jonathan Reichelt Gjertsen 2021-05-27 14:25:40 +02:00 committed by GitHub
parent a531123080
commit 5ad072af5b
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1 changed files with 9 additions and 0 deletions
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9
src/rp2_common/hardware_adc/include/hardware/adc.h
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@ -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
*