William San Filippo created MYNEWT-390:

             Summary: NRF HAL GPIO was not returning 1 for hal_gpio_read when 
pin input was high
                 Key: MYNEWT-390
                 URL: https://issues.apache.org/jira/browse/MYNEWT-390
             Project: Mynewt
          Issue Type: Bug
    Affects Versions: v0_9_0
            Reporter: William San Filippo
            Assignee: William San Filippo
             Fix For: v1_0_0_beta1

The HAL gpio API to read an input pin should return 0 if the pin is low and 1 
if the pin is high. The nrf (both 51 and 52) was returning a non-zero value if 
the pin was high but not 1 unless pin 0 was being read. It was returning 1 
left-shifted by the pin number. This API should return only 0 or 1 (not zero 
and non-zero).

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