#include "mbed.h"

Serial pc(USBTX, USBRX);
SPI spi(p5, p6, p7); // mosi, miso, sclk
int adcsel=0;
 
int main() {
    spi.format(8,1);
    spi.frequency(750000);
    pc.baud(115200);
 
    wait_ms(112);    //55ms:NG 56ms:OK
    spi.write(0x06);//reset
    wait_us(32);    //15us:NG 16us:OK
    spi.write(0x43);// write register 00h-03h
    spi.write(0x81);// AIN0-GND GAIN:1 PGA:off
    spi.write(0x80);// 330sps nomalmode single temp:off burn:off
    spi.write(0xc0);// ref:AVDD
    spi.write(0x02);// DOUT/DRDY
 
    spi.write(0x08);// START
    while(1){
        int rch0,rch1,rch2;
        if (!(LPC_GPIO0->FIOPIN & (1UL << 8))) {//pin6 input
            spi.write(0x10);          // Data Read Command
            rch0 = spi.write(0xff);          // NOP:ffh
            rch1 = spi.write(0xff);
            rch2 = spi.write(0xff);
            if(rch0>0x7f){
                rch0-=0x80;
            }else{
                rch0+=0x80;
            }
//            pc.printf("%02X%02X%02X%d\n", rch0, rch1, rch2,adcsel);
            pc.printf("%02X%02X%02X%d\r\r\r\r\r\r\n", rch0, rch1, rch2,adcsel);
            spi.write(0x40);     // write register 00h
            switch(adcsel){
                case 0:
                    spi.write(0x91);  // AIN1-GND GAIN:1 PGA:off
                    adcsel=1;
                    break;
                case 1:
                    spi.write(0xa1);  // AIN2-GND GAIN:1 PGA:off
                    adcsel=2;
                    break;
                case 2:
                    spi.write(0x81);  // AIN0-GND GAIN:1 PGA:off
                    adcsel=0;
                    break;
            }
            spi.write(0x08);     //start
        }
    }
}