Bluetooth Z8 Project Report

Transcription

1 Bluetooth Z8 Yao Chen 1 1. Introduction Bluetooth Z8 Project Report For CSci297 Embedded System Yao Chen chenyao927@gmail.com April 22, 2008 This project intends to implement an information transaction between Zilog Z8 Encore! Microcontroller Unit and a cell phone via Bluetooth connection. Once the communication is established, user is allowed to send a command from cell phone to the Z8 to request some information, e.g the temperature. The Z8 MCU is supposed to be used as a countdown alarm and string displayer as well. Figure 1: Z8 Encore! MCU Connection

2 Bluetooth Z8 Yao Chen 2 2. Components Generally, there are five basic components for this project: 1) Z8 Encore! Microcontroller Unit; 2) Bluetooth Module; 3) Temperature Sensors; 4) Speaker; 5) Java and Bluetooth supported cell phone. Figure 2: SparkFun Bluetooth Module Figure 3: Temperature Sensors The Bluetooth module used in this project is manufactured by SparkFun Electronics and the Bluetooth component is Philips BGB203. The temperature sensors used here are ADC and I2C sensors.

3 Bluetooth Z8 Yao Chen 3 3. Project Description 3.1 Functionality: 1) Z8 Side a) Z8 has physical connections with Bluetooth module, temperature sensors and speaker; b) Z8 reads temperature data from both two sensors; c) Z8 is implemented as a countdown timer. When the time is up, the speaker sounds as an alarm; d) Z8 displays string with LED arrays; 2) Cell Phone Side a) Cell phone runs J2ME application to discover the devices in the certain range with Bluetooth; b) Cell phone connects to the target device; 3) Communication a) Cell phone detects the Bluetooth module that links to Z8 MCU and asks for connection by sending a passkey 0000 ; b) Z8 receives the passkey and reminds user there is a connection request which is supposed to be answered by pressing switch 1 (sending answer key Z8BT ); c) When connection is established, cell phone is supposed to send a string or a command to Z8; d) Z8 displays strings with LED arrays or answers the requests from cell phone. Figure 4: Connection Negotiation 3.2 Developing Technologies 1) Z8 Encore! Family IDE version 4.10 ( )

4 Bluetooth Z8 Yao Chen 4 Used to develop and debug the program on Z8. 2) Java JDK 1.6 Sun Java compiler, used to compile the program on cell phone. 3) Sun Wireless Tool Kit (WTK) 2.5 Emulator, used to compile and debug the J2ME application for mobile devices. 4) Sun Netbeans IDE 6 Developing tool for J2ME application. 4. Hardware 4.1 Overview Physical Connection Wireless Connection Figure 5: Overview of implementation Nokia N93i: GSM mobile phone; CLDC 1.0/MIDP 2.0 J2ME support; Bluetooth support; Typically, all Java runtime environment supported mobile devices meet the requirement of this project. Zilog Z8 Encore: Z8F bit microprocessor; UART interface for Bluetooth communications;

5 Bluetooth Z8 Yao Chen 5 GPIO pins; ADC and I2C interfaces for temperature sensors; SparkFun Bluetooth Module: Philips BGB203 Bluetooth Component; UART interface, baud rate at 9600; Plug-and-play Bluetooth class 1 System-in-a-Package (SiP); Peripheral pins 1.8 and 3.3 V; LM34 Temperature Sensor: Analog data output; Calibrated directly in degrees Fahrenheit; Linear mv/ F scale factor; Rated for full 50 to +300 F range; Operates from 5 to 30 volts; TMP175 Temperature Sensor: 27 Address ; Digital Output: Two-Wire Serial Interface; Resolution: 9- to 12-Bits, User-Selectable; Wide Supply Range: 2.7V to 5.5V. 4.2 Pin Connection Detail Table 1: Pin Connection Detail Module SparkFun Bluetooth ADC Sensor I2C Sensor Speaker Zilog Z8 VDD Power supply VCC (3V) GND Ground GND RX Receive register Port D bit 5 (Transmit register) TX Transmit register Port D bit 4 (Receive register) RTS Request to send Loop to disable hardware flow CTS Clear to send control VDD Power supply VDD (5V) Vout Output of analog Port B bit 1 (Analog pin 1) signal GND Ground GND VDD Power supply VDD (5V) SCL Serial clock signal Port A bit 6 (SCL) SDA Serial data signal Port A bit 7 (SDA) GND Ground GND Pin 1 Pin 2 2 pins for speaker s high and low PC0 PC1

6 Bluetooth Z8 Yao Chen Hardware Diagram VCC (3V) VDD GND VDD (5V) SparkFun BT RX TX RTS CTS PB1 (ALG1) PD5 (TXD1) PD4 (RXD1) Temperature Sensors ADC VDD ADC VOUT ADC GND I2C VDD I2C SCL I2C SDA I2C GND PA6 (SCL) PA7 (SDA) Zilog Z8 Speaker Pin1 Pin2 PC0 PC1 5. Software Figure 6: Hardware Diagram 5.1 Z8 Side The program starts with waiting for connection request. When there is a request being received, the program verifies the request string. If the string is correspondent to the default, Z8 sends an answer to cell phone to establish the connection. Then receiver of UART1 keeps waiting for the data. When the string is received, program checks the string whether a command or a string received. If the data starts with command mark ~, validate the following bytes to find out if it is a valid command or not. If it is a string, display it on the LED.

7 Bluetooth Z8 Yao Chen 7 Startup Initialization Connection Established NO Not a Request Wait for request Receive String Check request Valid Request Send answer Wait for input Check input Temperature Request Countdown Request String Help Error Read Temperature Start Timer and alarm Display String Display Error Send Temperature Send Instruction Send Receipt Send Instruction Send Error Message Figure 7: Z8 Software Implementation

8 Bluetooth Z8 Yao Chen Cell Phone Side Startup Main Midlet Debug Form Destroy Device List Debug Form Send Request Debug Form History Log User GUI Receive Listen Send Cmd Debug Form Figure 8: J2ME Software Implementation 5.3 Programming Detail ZDS Project BluetoothZ8.zdsproj: Table 2: Files of ZDS Project File Description Implementation ADC.c function.c GPIO.c I2C.c Initialize and read from ADC temperature sensor. Validate the type of receiving string; Send temperature information. Initialize the LED array; Initialize the switch 1; Initialize the speaker; Switch 1 s interrupt. Initialize and read from I2C temperature sensor. ADC_init(); ADC_read(); check_string(); send_temp(); float_to_char(); read_num(); char_to_int(); gpio_init(); sio_init(); speaker_init(); isr_sw1(); I2C_init(); I2C_read();

9 Bluetooth Z8 Yao Chen 9 interrupt.c LED.c Initialize Timer1 for PWM output on speaker. Functions for LED display. timer1_init(); isr_timer1(); enable_mute(); disable_mute(); led_all_off(); etc. main.c Main file to startup the program. main(); timer.c Initialization and interrupt of timer 0 timer0_init(); which is countdown timer. isr_timer0; uart_init(); uart.c Initialize the UART registers and receive interrupt; Functions for sending string. isr_uart1_rx(); send_string(); send_byte(); etc. J2ME project Bluetooth&Z8: Table 3: Files of J2ME Project File Description Agent.java Class for connecting the remote Bluetooth module and sending or receiving data. Conn.java Class for establishing connection. Debug.java Form of debugging report. DeviceList.java List of found devices. Logger.java Form for displaying receiving data and history operations. MainUI.java Form of user s GUI. Z8BT.java Main Midlet of project. 5.4 Implementation Detail Command Syntax: ~ <command><configuration><parameter> <command>: required; <configuration>: required when set Z8 as a countdown timer; <parameter>: optional. Mobile Device Logger: Previous command is: ~<command><configuration><parameter> Response: <response>

10 Bluetooth Z8 Yao Chen 10 Command Set of Project: Table 4: Command Set Implementation Cmd Description Z8 LED Mobile Device Display received ~H Request help from Z8. HELP help information or ~h on logger form. ~T or ~t ~C or ~c Request all Temp data and differential value. Optional configure: -A or a: from ADC sensor. -I or i: from I2C sensor. Set Z8 as countdown alarm. Required configure: -A or a: automatically start timer. -M or m: manually start timer by user. <parameter> should be greater than 0. Specific Temp data or differential Temp value. Display integer value of <parameter>. When time is up, speaker sounds to remind user. Display received Temp information on logger form. Display operations required to start or stop alarm on logger form. 6. Summary This project is a highly practical example for integrating the software and hardware technologies. The concept of this project is not only focusing on the temperature capturing, but also many utilities in the regular life. I really hope it can be helpful for the public services in the future.

11 Bluetooth Z8 Yao Chen 11 Appendix - Photo Figure 9: Overview of Project Figure 10: Debug Report

12 Bluetooth Z8 Yao Chen 12 Figure 11: Device List Figure 12: Connection negotiation

13 Bluetooth Z8 Yao Chen 13 Figure 13: Request ADC Temperature Information Figure 14: Set a Manual Countdown Timer

14 Bluetooth Z8 Yao Chen 14 Figure 15: Instructions of Help