HM11 Class Reference

API for the HM-11 4.0 Bluetooth Low Energy Module. More...

Detailed Description

• ID: hm11
• Name: Bluetooth Low Energy Module
• Other Names: Grove BLE
• Other Chips: HM-10, HM-12
• Category: wifi
• Manufacturer: seeed
• Connection: uart
• Link: http://wiki.seeed.cc/Bluetooth_V4.0_HM_11_BLE_Module/

The driver was tested with the Grove BLE module. It's an HM-11 BLE 4.0 module based on a TI CC2541 chip. It operates using a standard 'AT' command set. See the datasheet for a full list of available commands and their possible responses:

http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf

It is connected via a UART at 9,600 baud.

    // Instantiate a HM11 BLE Module on UART 0

    upm::HM11 ble(0);

    // make sure port is initialized properly.  9600 baud is the default.
    if (!ble.setupTty(B9600)) {
        cerr << "Failed to setup tty port parameters" << endl;
        return 1;
    }

    printUsage(argv[0]);

    if (argc > 1) {
        cout << "Sending command line argument (" << argv[1] << ")..." << endl;
        sendCommand(ble, argv[1]);
    } else {
        // query the module address
        char addr[] = "AT+ADDR?";
        cout << "Querying module address (" << addr << ")..." << endl;
        sendCommand(ble, addr);

        upm_delay(1);

        // query the module address
        char pin[] = "AT+PASS?";
        cout << "Querying module PIN (" << pin << ")..." << endl;
        sendCommand(ble, pin);

        // Other potentially useful commands are:
        //
        // AT+VERS? - query module version
        // AT+ROLE0 - set as slave
        // AT+ROLE1 - set as master
        // AT+CLEAR - clear all previous settings
        // AT+RESET - restart the device
        //
        // A comprehensive list is available from the datasheet at:
        // http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf
    }

Public Member Functions
	HM11 (int uart)
	~HM11 ()
bool	dataAvailable (unsigned int millis)
int	readData (char *buffer, int len)
int	writeData (char *buffer, int len)
bool	setupTty (speed_t baud=B9600)

Protected Member Functions
int	ttyFd ()

Constructor & Destructor Documentation

HM11

(

int

uart

)

HM11 object constructor

Parameters

uart	Default UART to use (0 or 1)

~HM11

(

)

HM11 object destructor

Member Function Documentation

bool dataAvailable

(

unsigned int

millis

)

Checks to see if there is data available for reading

Parameters

millis

Number of milliseconds to wait; 0 means no waiting

Returns

True if there is data available for reading

int readData	(	char *	buffer,
		int	len
	)

Reads any available data into a user-supplied buffer. Note: the call blocks until data is available for reading. Use dataAvailable() to determine whether there is data available beforehand, to avoid blocking.

Parameters

buffer	Buffer to hold the data read
len	Length of the buffer

Returns

Number of bytes read

int writeData	(	char *	buffer,
		int	len
	)

Writes the data in the buffer to the device

Parameters

buffer	Buffer to hold the data read
len	Length of the buffer

Returns

Number of bytes written

bool setupTty

(

speed_t

baud = B9600

)

Sets up proper tty I/O modes and the baud rate. For this device, the default baud rate is 9,600 (B9600).

Parameters

baud	Desired baud rate.

Returns

True if successful

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The documentation for this class was generated from the following files:

• src/hm11/hm11.hpp
• src/hm11/hm11.cxx