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#include "mbed.h”

SPI ser_port(A6, A5, A4); // mosi, miso, sclk
DigitalOut red_led(D11); //red led
DigitalOut chip_select(D3); //this acts as “slave select”
char switch_word; //word we will send
char recd_val; //value return from slave

int main()
{
    ser_port.format(8,0); //8-bit data, Mode 0
    ser_port.frequency(1000000); // Clock frequency is set to 1MHz
    while (1)
    {
        switch_word=0xA0;
        chip_select = 0; //select slave
        recd_val=ser_port.write(switch_word); //send switch_word
        //and rec. data
        chip_select = 1;
        wait(0.01); //wait 10 ms
        red_led=0;
        if (recd_val==0xA0)
        red_led=1;
    }
}

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#include "mbed.h”
SPISlave ser_port(A6, A5, A4, D3); // mosi, miso, sclk, ssel
DigitalOut red_led(D11); //red led
char slave_word; //word the slave will send
char recd_val; //value received from the master

int main()
{
//If no formatting is made then default is applied
while (1)
{
    slave _word=0xA0;
    if(ser_port.receive()) //test for data Tx 
    {
        recd_val = ser_port.read(); //read from master
        ser_port.reply(switch_word); //send reply
    }
}
    red_led=0; //preset LED to 0
    if (recd_val==0xA0)
        red_led=1;
}

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#include "mbed.h"

I2C i2c_port(D0, D1); //Configure a serial port, SDA,SCL
DigitalOut red_led(p25); //red led
char master_word; //word we will send
char recd_val; //value return from slave
const int device_addr = 0x52; //I2C slave address

int main()
{
    while (1)
    {
        master_word=0xA0;
        //send a single byte of data, in a correct I2C package
        i2c_port.start(); // start condition
        i2c_port.write(device_addr); //send the device address
        i2c_port.write(master_word); //send 1-byte of data
        i2c_port.stop(); //stop condition

        wait(0.002);
        //receive a single byte of data, in correct I2C package
        i2c_port.start();
        i2c_port.write(addr|0x01);
        recd_val=i2c_port.read(addr);
        i2c_port.stop();
        if (recd_val==0xA0)
            red_led=1;
    }
}

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#include "mbed.h”

I2CSlave slave(D0, D1); // SDA, SCL
DigitalOut red_led(D11); //red led
char slave_word; //word the slave will send
char recd_val; //value received from the master

int main()
{
    slave.address(0x52); //set the slave address
    while (1)
    {
        slave _word=0xA0;
        slave.write(slave_word);//load the word that will be sent
        //check to see if slave was addressed
        int i = slave.receive();
        if (i == 3)
            recd_val = slave.read(); }
        if (recd_val==0xA0)
            red_led=1;
    }
}

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#include "mbed.h"
AnalogIn Ain(D3);
Serial pc(USBRX,USBTX);

int main(){
    double V;
    while(1){
    pc.printf("----Digital Voltmeter----");
    V = 3.3f*Ain;
    pc.printf("The measured voltage is %.2f", V);
    }
}