VCO_test

VCO_test

#include "mbed.h"
SPI spi(p5, p6, p7); // mosi, miso, sclk
DigitalOut cs(p8); //SYNC* pin labeled as cs 
DigitalOut LDAC(p9); //LDAC* pin
DigitalOut CLR(p10); //CLR* pin
DigitalOut Reset(p11); //Reset* pin

void write(char reg1, char reg2, char reg3);
void setup_DAC();

int main()
{
    setup_DAC();
    while(1)
    {      
        write(0x10, 0x00, 0x00); //programs DAC to change to the voltage corresponding to 14, CC, CD
    }       
}


void write(char reg1, char reg2, char reg3)
{
    cs = 1;
    LDAC = 1;
    cs = 0;
    spi.write(0x20); //Sets the control register
    spi.write(0x00); //DACTRI, OPGND, SDOSIS, LINCOMP = 0
    spi.write(0x12); //RBUF, BIN/2sC = 1
    wait_us(1);
    cs = 1;
    wait_us(1);
    LDAC = 0;
    wait_us(1);
        
    cs = 1;
    LDAC = 1;
    cs = 0;
    spi.write(0x40); //Sets the control register
    spi.write(0x00); //LDAC*, CLR*, RESET* = 0
    spi.write(0x00); //Still setting control register
    wait_us(1);
    cs = 1;
    wait_us(1);
    LDAC = 0;
    wait_us(1);
        
    cs = 1;
    LDAC = 1;
    cs = 0;
    spi.write(reg1); //Sets the control register
    spi.write(reg2); //LDAC*, CLR*, RESET* = 0
    spi.write(reg3); //Still setting control register
    wait_us(1);
    cs = 1;
    wait_us(1);
    LDAC = 0;
    wait_us(1);   
    return;
}
    
void setup_DAC()
{
    //mbed_reset();
    spi.format(8,1); //set words sent to DAC to 8 bits, and sclk to mode 1
    spi.frequency(10000); //set sclk frequency
    Reset = 0;
    wait_us(1);
    Reset = 1;
    LDAC = 0;
    CLR = 1;   
    return; 
}