Yoji KURODA / AD7490

Analog Devices 16 channels, 1MSPS, 12bit ADC with SPI interface

You are viewing an older revision! See the latest version

Homepage

Analog Devices' AD7490 A/D converter chip is a great choice to increase ADC channels to mbed. I wrote a C++ class library, which allows multiple chips on the same SPI serial bus line.

#include "mbed.h"
#include "AD7490.h"

DigitalOut myled(LED1);

int main() {

    // set up SPI interface. 
    // should be set before call AD7490 constructer
    SPI spi(p11,p12,p13);
    spi.format(16,0);
    spi.frequency(1000000);

    // construct AD7490 instances
    AD7490 ad1(spi, p9);
    AD7490 ad2(spi, p10);

    // start ad conversion with sequential mode
    ad1.sequential();
    ad2.sequential();

    short ad_data[32];
    while(1) {

        myled = 1;
        ad1.read(&ad_data[ 0]);
        ad2.read(&ad_data[16]);
        myled = 0;

        for(int i=0; i<32; i++)
            printf("ch[%2d]: %d\n", i, ad_data[i]);
        puts("");
        
        wait(1);
    }
}
All wikipages