File content as of revision 1:3b74123e6d7a:

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

TextLCD lcd(p25, p26, p24, p23, p22, p21); // RS, E, DB4, DB5, DB6, DB7

/*-- AT command and parameters --*/
uint8_t atISCmd[] = {'I', 'S'};      // Forces a read of all enabled digital and analog input lines
uint8_t atDBCmd[] = {'D', 'B'};      // Received Signal Strength
uint8_t cmdVal0[] = {0};             // Clear RSSI regisger

/*-- Create instanse of Xbee object --*/
XBee xbee(p13, p14);
XBeeAddress64 remoteAddress(0x0013A200, 0x406B7111);    // Specify your XBee address

/*-- Create instanse of Command and Response object --*/
// Remot ATIS command to read ADC value (ADC3 is enabled by X-CTU tool)
RemoteAtCommandRequest remoteSampleRequest(remoteAddress, atISCmd);
// Local ATDB command to read signal strength (RSSI)
AtCommandRequest atDB(atDBCmd);
// Local ATDB0 command to clear RSSI
AtCommandRequest atDB0(atDBCmd, cmdVal0, sizeof(cmdVal0));
// Create instanse to handle command response
AtCommandResponse response = AtCommandResponse();
RemoteAtCommandResponse remoteResp = RemoteAtCommandResponse();


/* Receive command response packet
 * If OK response recieved, return pointer to the Response Data Frame
 */
uint8_t* GetResponse() {
    // Read response
    if (xbee.readPacket(5000)) {
        // Got a response! Check if response is AT command respose
        if (xbee.getResponse().getApiId() == AT_COMMAND_RESPONSE) {
            xbee.getResponse().getAtCommandResponse(response);
            if ( response.getStatus() == AT_OK ) 
                return response.getValue();
        } else  if (xbee.getResponse().getApiId() == REMOTE_AT_COMMAND_RESPONSE) {
            xbee.getResponse().getRemoteAtCommandResponse(remoteResp);
            if ( remoteResp.getStatus() == AT_OK ) {
               // Debug print
                printf("Response Data:");
                   for (int i = 0; i < remoteResp.getValueLength(); i++)
                   printf("%02X ", remoteResp.getValue()[i]);
                printf("\n");
                
                return remoteResp.getValue();
            } else {
                printf("Remote Command Error:0x%X\n", response.getStatus());
            }
        }
    }

    return 0;
}


/* Get ADC data
 * Data frame structure of ATIS
 * Offset
 *   0   : Number of Samples (Always 1)
 *   1-2 : Digital Channel Mask
 *   3   : Analog Channel Mask
 *   4-5 : Digital Samples (Omit if no DIO enabled)
 *   6-7 : First ADC Data
 */
uint16_t getAnalog(uint8_t *FrameData, int ADC) {
    // ADC data feild starts 4 bytes offest, if no DIO enabled
    uint8_t start = 4;

    // Contains Digital channel?
    if (FrameData[1] > 0 || FrameData[2] > 0) {
        // make room for digital i/o
        start+=2;
    }

    // start depends on how many ADCs before this ADC are enabled
    for (int i = 0; i < ADC; i++) {
        // Is Analog channel Enabled ?
        if ( (FrameData[3] >> i) & 1 ) {
            start+=2;
        }
    }

    return (uint16_t)((FrameData[start] << 8) + FrameData[start + 1]);
}


int main() {
    unsigned int loop = 0;

    xbee.begin(9600);
    lcd.printf("RSSI:");
    lcd.locate(0, 1);
    lcd.printf("ADC :");
    printf("\nStart.\n");

    while (true) {
        uint8_t *responseVal;
        uint8_t rssiVal = 0;
        uint16_t adcVal = 0;

        // Send ATDB command (Read RSSI register from local Xbee)
        xbee.send(atDB);
        responseVal = GetResponse();
        if ( responseVal != 0 )
            rssiVal = responseVal[0];
        lcd.locate(5, 0);
        if (rssiVal == 0)
            lcd.printf("No Signal");
        else
            lcd.printf("-%ddBm   ", rssiVal);

        // Clear RSSI register, because Xbee hold RSSI value of last received packet even after radio disconneded
        xbee.send(atDB0);
        GetResponse();

        // Read ADC3 value by sending ATIS command
        xbee.send(remoteSampleRequest);
        responseVal = GetResponse();
        if ( responseVal != 0 ) {
            adcVal = getAnalog(responseVal, 3); // Assume ADC3 is enabled
        }
        lcd.locate(5, 1);
        if (adcVal == 0)
            lcd.printf("-     ");
        else
            lcd.printf("%d", adcVal);
    
        printf("Loop:%d\n", loop++);
        wait(1.0);
    }
}