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Thread: TC1782 12 bit SPI

  1. #1
    Beginner Beginner PinGNU is on a distinguished road
    Join Date
    Jun 2017

    TC1782 12 bit SPI


    I am trying to use a 16bit dac with 24bit SPI interface AD5689R_5687R
    I am using the 1782 SSC1 interface selecting 12bit MSB mode.
    I am not using the SLSO pins just an independent chip select

    I tried in the end random numbers and get an output but can not the relationship with the register
    This might be a general SPI question as I normally use a 8bit or a 16bit register to write to SPI what happens when I use a 24bit do I do 3x 8bit or 2x 12bit

    I do need to switch back to a 16bit device afterwards
    SSC1_SSOC.reg = 0x00000000; disable 16bit spi device
    SSC1_CON.bits.BM = 0xB; // transfer data width is 12 bit
    ChipSelect(12); //select device
    IO_vResetPin( IO_P0_15 ); // P_CSEL_OE
    SSC1_vSendData(first 12bit value);
    while(SSC1_STAT.bits.BSY); // BSY is set while a transfer is in progress
    SSC1_vSendData(2nd 12bit value);
    while(SSC1_STAT.bits.BSY); // BSY is set while a transfer is in progress
    IO_vSetPin( IO_P0_15 ); // P_CSEL_OE SYNC line high
    SSC1_CON.bits.BM = 0xF; // transfer data width is 16 bit for maindac
    SSC1_SSOC.reg = 0x00002000; // load SSC1 slave select output control reenable SLS0O5


  2. #2
    Advanced Advanced cwunder is on a distinguished road
    Join Date
    Feb 2015
    You could use 8-bit transfer and perform three of them. If you keep the transmit buffer full it will look like one continuous transfer which means you can use the automatic chip select.

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