Component: Bluetooth (EB024, Generic AT) (Wireless)
| Author | Matrix Ltd. |
| Version | 1.2 (Release) |
| Category | Wireless |
Contents
Bluetooth (EB024, Generic AT) component
Low level routines for controlling a standard AT Bluetooth interface. Also available in the form of the EB024 Bluetooth E-block.
Examples
Making a device discoverable
Example program to set up the Bluetooth module to be discoverable with a pair key. Any data received is then output onto the LCD component. You can connect to the Bluetooth device using a PC with Bluetooth connection and using software such as Flowcode 6, RealTerm or HyperTerminal. Alternatively you can connect using a smart phone running a terminal emulator app or via another embedded Bluetooth board.
Bluetooth Discover
Script 1 contains the AT commands to setup the Bluetooth device to be discoverable with pair key "1234".
Searching for a device
Example program to scan for local discoverable Bluetooth devices. For each device found the MAC address is displayed on to the LCD.
Bluetooth Inquiry
Connecting to a device
Example program to connect to a specific Bluetooth device address and send data to the device.
Bluetooth Connect
The device MAC address is specified using the "CreateCommandString" and "SendCommand" macros.
Downloadable macro reference
StringRead
Returns the ASCII value of character idx of the Response string.
Parameters
- BYTE idx
- Needs to be a equal to or less than the string length of the response in order to retrieve a valid character.
Return value
SendScript
Sends Script idx
Note that the general property Number of Scripts needs to be set so that it allows the scripts to be accessed and sent.
Returns 0 for success and 1 for error
Parameters
- BYTE idx
- Refers to the Script page to send (1-4).
Return value
SendCommand
Sends the command buffer.
Returns 1 for success in sending the command.
Returns 0 for errors.
Parameters
- BYTE ExpectEcho
- Remote module automatically echos back data: 1 = On (Expect echo), 0 = off
- BYTE SendCR
- Automatically adds \n to the end of the command data: 1 = append CR, 0 = no CR.
Return value
CreateCommandString
Assigns a string of characters to the Command buffer.
Returns 1 for success in adding the characters to the buffer.
Returns 0 for errors, including Buffer overflow.
Parameters
- <- STRING Data
- This parameter may be returned back to the caller
Return value
StringReceive
Checks for a response string.
Returns the length of the response string if one is present otherwise returns 0.
Parameters
- This macro has no parameters
Return value
CreateCommand
Adds a single characters to the end of the Command buffer.
Returns 1 for success in adding the characters to the buffer.
Returns 0 for errors, including Buffer overflow.
Parameters
- BYTE Character
- ASCII value or single character,
Return value
Send_byte
No additional information
Parameters
- BYTE ByteVal
Return value
- This call does not return a value
WaitForResponse
Waits for a response message of type response_code for timeout ms.
Returns: 0 for a Response of type response_code
255 (0xFF) for a timeout or invalid response
Response string length for any Response not of type response_code
Parameters
- BYTE response_code
- 1:OK / 2:ERROR / 3:CONNECT / 4:NO CARRIER / 5:AUDIO / 6:PAIR / 7:RING
- BYTE timeout
- The timeout value will need to set to allow sufficient time for the response to arrive.
Return value
Initialise
Required to be used whenever the Bluetooth component is used in a program.
Initialises the Bluetooth component ready for use.
Parameters
- This macro has no parameters
Return value
- This call does not return a value
Simulation macro reference
This component does not contain any simulation macros
Property reference
Channel
This property is of type Fixed list of ints and can be referenced with the variable name CHANNEL.
UART Comms Channel
Flow Control
This property is of type Fixed list of ints and can be referenced with the variable name FLOWEN.
Determines if flow control is enabled or not
Baud Rate
This property is of type Fixed list of ints and can be referenced with the variable name BAUD_LIST.
UART baud rate, specified by Bluetooth module - normally 9600 is the default
Command Buffer Size
This property is of type Unsigned integer and can be referenced with the variable name CommandBufferSize.
Maximum number of bytes that can be stored in the outgoing command buffer.
Response Buffer Size
This property is of type Unsigned integer and can be referenced with the variable name ResponseBufferSize.
Maximum number of bytes that can be stored in the incoming response buffer.
Script Count
This property is of type Fixed list of ints and can be referenced with the variable name SCRIPTS.
Controls how many AT scripts are stored into non-volatile memory
Script 1
This property is of type Multiple lines of text and can be referenced with the variable name SCRIPT1.
Data to send for script 0, each command should be terminated with a carriage return
TX
This property is of type Single digital pin and can be referenced with the variable name TX.
UART transmit pin
RX
This property is of type Single digital pin and can be referenced with the variable name RX.
UART receive pin
Data Source
This property is of type Fixed list of ints and can be referenced with the variable name DataSource.
Simulation data source
Injector
This property is of type Fixed list of ints and can be referenced with the variable name Injector.
Injector component to connect as data end point
