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Spi engine

superhector2000superhector2000 Posts: 1
edited 2010-02-02 16:09 in Propeller 1
Hello all,

I need help with configuring my propeller Stick to be able to read from a IMU in SPI protocol. I need to write to this sensor 6 bytes and at the same time read 6 bytes but I'm not able to do this simultaneously. The reason to do it like this is the SPI protocol.

Thanks,

Hector.

Comments

  • JonnyMacJonnyMac Posts: 9,550
    edited 2010-02-02 16:09
    You should be able to do something like this:

    pub spi(bOut) | bIn 

  bIn~
  repeat 8
    outa[noparse][[/noparse]MOSI] := bOut & %1                     ' output bit, LSBFIRST
    bOut >>= 1                                  ' prep for next cycle
    outa[noparse][[/noparse]CLK]~~                                 ' CLK high
    bIn := (bIn >> 1) | (ina[noparse][[/noparse]MISO] << 7)        ' get bit, LSBFIRST
    outa[noparse][[/noparse]CLK]~                                  ' CLK low

  return bIn

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    Jon McPhalen
    Hollywood, CA
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