File content as of revision 3:5010d20e681f:

#include "mbed.h"
#define FRAMEDELIMITER 0x7E
#include "rtos.h"

// 4269
DigitalOut resetswitch(p8);
Serial xbee(p13, p14);
Serial pc(USBTX, USBRX);
DigitalOut myled(LED1);

int CalculateChecksum()
{
    // Does not include frame delimiter and lenght
    return 1;
}

int CalculateLenght()
{
    // Calculate the number of bytes in the frame data
    return 1;
}

void printhexa(char c)
{
    char msb = c >> 4;
    char lsb = c & 0xF;
    
    if (msb < 10)
        msb += 0x30;
    else
        msb += 0x37;
        
    if (lsb < 10)
        lsb += 0x30;
    else
        lsb += 0x37;
    
    pc.putc('0');
    pc.putc('x');
    pc.putc(msb);
    pc.putc(lsb);
    pc.putc(' ');
}

void GetATResponse()
{
    char start = xbee.getc(); // = FRAMEDELIMITER
    //assert
    char len_msb = xbee.getc();
    char len_lsb = xbee.getc();
    
    int len = ((int) len_msb << 4) + (int) len_lsb;
    char frame_data[len];
    int i = 0;
    pc.printf("%d : ", len);
    while (i < len)
    {
        if (xbee.readable())
        {   
            frame_data[i] = xbee.getc();
            printhexa(frame_data[i]);
            i++;
        }
    }
    
    char checksum = xbee.getc();
    // Verify checksum
    pc.printf(" checksum = ");
    printhexa(checksum);
    pc.printf("\r\n");
}

void ReadSerial()
{
    // 00 13 A2 00 
    // 40 3E 09 63
    char cmdtosend[8];
    int i = 0;
    
    cmdtosend[0] = FRAMEDELIMITER;
    cmdtosend[1] = 0x00;
    cmdtosend[2] = 0x04;
    cmdtosend[3] = 0x08;
    cmdtosend[4] = 0x52;
    cmdtosend[5] = 'S'; // 0x53
    cmdtosend[6] = 'L'; // 0x48
    cmdtosend[7] = 0xFF - (cmdtosend[3]+cmdtosend[4]+cmdtosend[5]+cmdtosend[6]);
    
    while (i < 8)
    {
        xbee.putc(cmdtosend[i]);
        i++;
    }
    
    wait(0.5);
    i = 0;
    cmdtosend[0] = FRAMEDELIMITER;
    cmdtosend[1] = 0x00;
    cmdtosend[2] = 0x04;
    cmdtosend[3] = 0x08;
    cmdtosend[4] = 0x52;
    cmdtosend[5] = 'S'; // 0x53
    cmdtosend[6] = 'H'; // 0x48
    cmdtosend[7] = 0xFF - (cmdtosend[3]+cmdtosend[4]+cmdtosend[5]+cmdtosend[6]);
    
    while (i < 8)
    {
        xbee.putc(cmdtosend[i]);
        i++;
    }
}

void AtCommand(char FirstChar, char SecondChar, char *OptionalParam = NULL, int ParamLen = 0)
{
    // Frame Type 0x08
    // Two char as parameters
    
    char cmdtosend[10];
    char sum = 0;
    int cmdlength = 8;
    int i = 0;
    
    cmdtosend[0] = FRAMEDELIMITER;
    cmdtosend[1] = 0x00;
    cmdtosend[2] = 0x04 + ParamLen;
    cmdtosend[3] = 0x08;
    cmdtosend[4] = 0x52;
    cmdtosend[5] = FirstChar;
    cmdtosend[6] = SecondChar;
    
    // Ajouter les parametres au message
    if(OptionalParam != NULL)
    {   
        i = 0;
        cmdlength += ParamLen;
        
        while (i < ParamLen)
        {
            pc.putc((OptionalParam)[i]);
            cmdtosend[7 + i] = (OptionalParam)[i];
            i++;
        }
        pc.printf("\r\n");
    }
    
    // Calculate checksum
    i = 3;
    while (i < (cmdlength - 1))
    {
        sum += cmdtosend[i];
        i++;
    }
    cmdtosend[cmdlength - 1] = 0xFF - sum;
    
    // Envoyer la commande sur UART
    i = 0;
    while (i < cmdlength)
    {
        xbee.putc(cmdtosend[i]);
        i++;
    }
}


void xbee_reader()
{
    while(1)
    {
        if (xbee.readable())
        {
            GetATResponse();
        }
        wait(0.001);   
    }
}

void tick()
{
    myled = !myled;   
}

int main() {
    Thread thread(xbee_reader);
    Ticker ticker;
    ticker.attach(&tick, 1);
    pc.printf("\r\n");
    resetswitch = 0;
    wait(0.4);
    resetswitch = 1;
    
    wait(3);

    char Params[2] = {'a', 'b'};

    ReadSerial();
    wait(0.5);
    AtCommand('O', 'I');
    wait(0.5);
    AtCommand('I', 'I', &Params[0], 2);
    wait(0.5);
    AtCommand('O', 'I');
    wait(0.5);
    
    
    while(1) {
    }
}