• Bernd Porr's avatar
    usbdux: usbduxsigma: fixed timing issues between ADC and DAC · 75cc3ef8
    Bernd Porr authored
    When sync ADC and the DAC was running at the same time the ADC
    showed spikes in the signal. This happened when just before the
    DRDY from the ADC was triggered a DAC interrupt was dealt with.
    ADC and DAC share the same SPI bus and priority is now given the
    ADC. The DAC values are now first stored in a buffer and
    are only send to the DAC once the ADC has finished
    converting all channels (start = 0) so that the SPI bus is
    definitely quiet for about 100us.
    Signed-off-by: default avatarBernd Porr <mail@berndporr.me.uk>
    Signed-off-by: default avatarKyle McMartin <kyle@kernel.org>
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