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Fix assert in adc_set_round_robin() (#698)

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The mask passed in shouldn't already be shifted by ADC_CS_RROBIN_LSB
(16) otherwise the shift in the call to hw_write_masked() would shift
all of the bits off the end of the mask, hence we should be asserting
not against ADC_CS_RROBIN_BITS (0x1f0000) but against the number of ADC
channels available.
This commit is contained in:
bobsayshilol 2022-01-19 15:34:18 +00:00 committed by GitHub
parent 96afce8ece
commit 25a3b36793
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1 changed files with 1 additions and 1 deletions
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src/rp2_common/hardware_adc/include/hardware/adc.h
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@ -106,7 +106,7 @@ static inline uint adc_get_selected_input(void) {
* \param input_mask A bit pattern indicating which of the 5 inputs are to be sampled. Write a value of 0 to disable round robin sampling.
*/
static inline void adc_set_round_robin(uint input_mask) {
invalid_params_if(ADC, input_mask & ~ADC_CS_RROBIN_BITS);
valid_params_if(ADC, input_mask < (1 << NUM_ADC_CHANNELS));
hw_write_masked(&adc_hw->cs, input_mask << ADC_CS_RROBIN_LSB, ADC_CS_RROBIN_BITS);
}