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adc: adc_read() not check for error (#1575) v2 #1599

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adc: adc_read() not check for error (#1575) v2 #1599

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Commits on Jan 2, 2024

  1. adc: adc_read() not check for error (raspberrypi#1575) v2 

    Implementation of adc_read() not check for errors in the ADC_CS register.
    
-  change the return type from uint16_t to int32_t
-  check for ADC_CS_READY_BITS and error ADC_CS_ERR_BITS or ADC_CS_ERR_STICKY_BITS    
- return the ADC value (12bits) or the negative value of
ADC_CS_ERR_BITS or ADC_CS_ERR_STICKY_BITS depending on the error
    @ruehlchris
    ruehlchris authored Jan 2, 2024
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