File content as of revision 0:25cb75cafbb8:

#include "mbed.h"
#include "m3pi.h"

m3pi m3pi;

Serial dev(p28,p27);
DigitalOut led1(LED1);

const int BUFF_LENGTH = 8;

uint8_t rx_buf[BUFF_LENGTH];
char str_buf[BUFF_LENGTH];

void dev_recv() {
    
    // toggle the LED whenever a data transmission is received
    led1 = !led1;
    
    int i = 0;
    for (i=0; i < BUFF_LENGTH; i++) {
        // let buffer empty if it's not ready to be read yet
        if (!dev.readable()) {
            wait(0.1f);
        }
        
        // if still nothing to read after waiting, must have received
        // less than BUFF_LENGTH bytes
        if (!dev.readable()) {
            break;
        }
        
        uint8_t b = dev.getc();
        rx_buf[i] = b;
        str_buf[i] = (char)b;
    }
    
    m3pi.cls();
    m3pi.locate(0,0);
    
    // print the buffer contents as ASCII on the first line
    m3pi.print(str_buf, i);
    
    // print the buffer length on the second line
    m3pi.locate(0, 1);
    char str[BUFF_LENGTH] = "";
    sprintf(str, "%d", i);
    m3pi.printf(str);
    
}

int main() {
    dev.baud(9600);
    dev.attach(&dev_recv, Serial::RxIrq);
    m3pi.locate(0, 1);
    m3pi.printf("BT LE");

    while(1) {
        sleep();
    }
}