File content as of revision 0:a17db953c0b2:

#include "mbed.h"
#define MAX 4
 
Serial xbee(PA_9, PA_10); // tx, rx
AnalogIn ain_0(PA_5);
AnalogIn ain_1(PA_6);
AnalogIn ain_2(PA_4);
AnalogIn ain_3(PA_7);

DigitalIn sw_0(PB_3);
DigitalIn sw_1(PB_5);
DigitalIn sw_2(PB_4);

DigitalOut myled(PA_8);

Ticker adc_timer;
Ticker Tr_timer;
Ticker led_timer;
char data[MAX] = {0};
unsigned int sw = 0;
volatile int RECEVED = 0;

void transmit(void)
{
    if(sw == 0)
    {
        xbee.putc('R');
    }
    else if(1 <= sw && sw <= MAX)
    { 
        xbee.putc(data[sw-1]);
    }
}

void switching(void)
{
    if(sw == 0)
    {
        sw = 1;
    }
    else if(sw > 0)
    {
        if(++sw > MAX){
            sw = 0;
        }
    }
}

void receve(void)
{
    RECEVED = 1;
}
    
void adcRead(void){
    /*ステッピングモーター*/
    data[0] = ain_0 * 255;
    
    /*EX球*/
    data[1] = ain_1 * 255;
    
    /*天の川*/
    data[2] = ain_2 * 255;
    
    data[3] = ain_3 * 255;
}

void led_off(void)
{
    static int cnt = 0;
    if(RECEVED == 1)
    {
        myled = 1;
        RECEVED = 0;
        cnt = 0;
    }
    else if(++cnt > 50)
    {
        myled = 0;
        RECEVED = 0;
    }
}

int main() {
    sw_0.mode(PullUp);
    sw_1.mode(PullUp);
    sw_2.mode(PullUp);
    xbee.baud(9600);
    xbee.format(8, Serial::None, 1);
    xbee.attach(&switching, Serial::TxIrq);//送信完了時に割り込み
    xbee.attach(&receve, Serial::RxIrq);//受信割り込み
    Tr_timer.attach_us(&transmit, 30000);//送信
    adc_timer.attach_us(&adcRead, 20000);//ADC用
    led_timer.attach_us(&led_off, 10000);//通信確認led用
    while(1)__WFI();
}