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Altera_Forum
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7 years ago

Need SPI core variant advice - Altera FPGA development kit '3-wire DAC'

I need to write to the 3 pin SPI DAC on Intel Max10 FPGA Development Kit from C using NIOS soft processor. There are several SPI IP varieties to choose from in Platform Designer. I'm not su...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

I have successfully used SPI (3 Wire Serial) to drive slow ADCs and DACs with both NIOSII/C program and HPS/Linux.

depending on your dac type you can have different code. Mine was simple: 

int DACSetVoltage(float V, int DACnr)
{
    int value = DACVoltage2Bit(V); // this is my function that converts float value to binary corresponding to DAC type and reference voltage used.
    alt_u8 array;
    array = value>>8;
    array = value & 0xff;
    return alt_avalon_spi_command(DAC_SPI_BASE, DACnr, 2, array, 0, 0, 0);
}