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Interrupt problem MBF200 fingerprint sensor

Discussion in 'Electronic Design' started by Johannes Schöller, Jul 30, 2006.

  1. Hi,
    I have a problem with the interrupt on the MBF200 fingerprint sensor.
    As stated in the datasheet
    (www.fujitsu.com/downloads/MICRO/fma/pdf/mbf200_ds.pdf) a interrupt
    should occur if the sensor is touched and the appropriate bits in the
    ICR are set. Interface mode is SPI. Trying to set the bits IE0 and IP0
    in the ICR does not cause an interrupt at all, setting the bits IE0, IP0
    and IT0 causes an interrupt immediately after the last bit of the ICR is
    sent an the CS line goes up, regardless of touching the sensor and the
    value of the THR. Trying to acknowledge the interrupt by writing the ISR
    bit IR0 does not change anything, the interrupt never appears again.
    Everything else works fine, reading the image, setting the registers,...

    I'd appreciate if someone could help me with a hint or a codesnip.
    Best regards,
    Johannes Schöller
     
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