File content as of revision 0:416329806e55:

// Demo Program for Labmbed Board

#include "mbed.h"
#include "TextLCD.h"

TextLCD lcd(p15, p16, p17, p18, p19, p20); // LCD: RS, E, D4-D7
SPI spi(p5, p6, p7);                       // SPI: MOSI, MISO, SCLK (MISO not used with LCD)
DigitalOut lat(p8);
I2C i2c(p9, p10);                          // I2C: SDA, SCL

int led_bits = 0;                          // global LED status used for readback
const int tmp102addr = 0x92;               // TMP102 temperature I2C address


void initleds() {
    lat = 0;                               // latch must start low
    spi.format(16,0);                      // SPI 16 bit data, low state, high going clock
    spi.frequency(1000000);                // 1MHz clock rate
}

void setleds(int ledall) {
    led_bits = ledall;
    spi.write((led_bits & 0x03ff) | ((led_bits & 0xa800) >> 1) | ((led_bits & 0x5400) << 1));
    lat = 1;                               // latch pulse start 
    lat = 0;                               // latch pulse end
}

void setled(int ledno, int ledstate) {
    ledno = ((ledno - 1) & 0x0007) + 1;    // limit led number
    ledno = (8 - ledno) * 2;               // offset of led state in 'led_bits'
    ledstate = ledstate & 0x0003;          // limit led state
    ledstate = ledstate << ledno;
    int statemask = 0x0003;
    statemask = ((statemask << ledno) ^ 0xffff);
    led_bits = ((led_bits & statemask) | ledstate);
    setleds(led_bits);
}

int readled(int ledno) {
    ledno = ((ledno - 1) & 0x0007) + 1;    // limit led number
    ledno = (8 - ledno) * 2;               // offset of led state in 'led_bits'
    int ledstate = led_bits;
    ledstate = ledstate >> ledno;
    return (ledstate & 0x0003);    
}

int readleds() {
    return led_bits;
}

//int readswitch(int switchno) {
//}

//int readswitches(int switchno) {
//}

//int readkey(int keyno) {
//}

//int readkeyrow(int keyrow) {
//}

//int readkeys() {
//}

float readtemp() {
    char cmd[2];
    cmd[0] = 0x01;
    cmd[1] = 0x00;
    i2c.write(tmp102addr, cmd, 2);
    wait(0.5);
    cmd[0] = 0x00;
    i2c.write(tmp102addr, cmd, 1);
    i2c.read(tmp102addr, cmd, 2);
    return (float((cmd[0]<<8)|cmd[1]) / 256.0);    
}

int main() {
    
    initleds();
  
    while(1) {

    setled (5,2);
    setled (6,1);
    setled (7,3);
    
    int led = readled(6);
    lcd.printf("                \n");
    lcd.printf("LED6 = %d\n", led);
    wait(3);
    
    setleds(0x5555);
    led = readleds();
    lcd.printf("                \n");
    lcd.printf("LEDs = %d\n", led);
    wait(3);
    
    float temp = readtemp();
    lcd.printf("                \n");   
    lcd.printf("Temp = %f\n", temp);
    wait(3);
    
    }
}