Dual Tone Multi-Frequency (DTMF) Generation with TI-DSP TMS320C6713 Processor

Transcription

1 Dual Tone Multi-Frequency (DTMF) Generation with TI-DSP TMS320C6713 Processor Objective The goals of this lab are to gain familiarity with TI DSP code composer studio and the TI-DSP Starter Kit (DSK). These goals can be accomplish by: Programming the 4 dip switches, Controlling the leds with dip switches, Output through onboard codec. Walk-through 1. Power up the TI-DSP evaluation module. 2. Make sure the speaker is connected to the headphone jack. 3. Reset the board, by pressing the on-board reset button, there will be running LEDs and also an available beep as an indication that the on-board sound CODEC is working fine. 4. Perform the 6713 DSK Diagnostic Utility to verify the functionality of the DSK. 5. Make sure all the DSK passed all the diagnostics. Figure 1: 6713 DSK Diagnostic Utility.

2 Part 1 1. Create a folder called myprojects on the desktop. The location of the myprojects folder. Figure 2: Code composer Studio. 2. Run the C6713 DSK Code Composer Studio (C6713 DSK CCS). 3. Go to Project New, create a project called dtmf. 4. Make sure the Project Type is Executalble (.out) and Target is TMS329C67XX. 5. Download the needed files from 6. Once the project is created, go to Project Add files to project, add the DSK6713 Board Support Library (BSL)file. This library will simplify the communication with the board using C language. The file is located at C:\ti\c6000\dsk6713\lib\dsk6713bsl.lib. More information about this library can be found in Help TMS320C6713 DSK Software Board Support Library. 7. Next, include the dtmf.cdb file from the webpage. This configuration file will setup all the DSP/BIOS correctly for the use of this lab. 8. Finally, you can create a new file and begin the laboratory assignment. Remember to save the file as dtmf.c and include it to the project in order for it to run.

3 Figure 3: After including all necessary files. Compiling into Machine Language 1. After writing the code, the next step is to compile the code to machine language. Go to Project Build. 2. The Build command will compile all the files that are include in this project and make an executable file for the DSP. 3. Compiler results are shown at the bottom of the window. Rebuild All Compiler windows Figure 4: Compiler Comments.

4 4. Loading Program into DSP Processor 1. Finally, to run the program, load the program into the DSP. Go to File Load Program. Load the executable file (.out) that the compiler generated (generally in the Debug directory of the project). Figure 5: Load Program. 2. The run the file loaded into the DSP. Go to Debug Run. Run Figure 6: Program running.

5 Laboratory Assignment Task 1 First part of the laboratory is to program the each dip switch to control their respectively numbered led (e.g. dip switch # 1 controls led #1, etc). HAVE YOUR TA VERIFY YOUR WORK TO THIS POINT (initials) Task 2 DTMF tones are used in telephone for tone dialing. Each key on a keypad has a distinct sound made up of two single-frequency tones. One tone represents the column and the other tone represents the row as shown in Figure 7. For example if you push the 2 key, you get two tones one at 1336Hz because it is in column 2 and one at 697 Hz because it is in row 1. Therefore, when a number is dial on a dial tone phone, the actual detection of the number dial is through detection of what tones that are being dialed. Figure 7: DTMF frequencies. In task 2, you are required to generate the all the 12 buttons/keys on a conventional dial-tone phone. You are going to program the dip switches to generate different DTMF tone. The dip switches will act as binary bit which correspond to Table 1. Binary Symbol Binary Symbol * # Table 1: Dip switch condition and symbol. The dip switches and LEDs are labeled from 0 3. Therefore, your program will reflect that the least significant bit correspond to dip switch # 3 and led # 3. Hint : Basically, the DSP must (1) read the input from the dip switches, (2) determined which switch is pressed, (3) generate the standard touch-tone frequencies for that switch combination corresponding to Table 1 and finally, output the tones through the connected speaker. HAVE YOUR TA VERIFY YOUR WORK TO THIS POINT (initials)