Over-view of Lab. 1

1. Over-view of Lab. 1 See the Lab. 1 web-site and the lecture notes for more details

2. Radio controlled – voice activatedrobotic car “term” project • Set-up the processor to control the board A/D and D/A; allows capture and play-back sound. • Set-up the processor so that we can read general purpose input lines (GPIO -- switches) so we send various different commands. • Use DSP part of Blackfin processor to run (canned – meaning provided) frequency analysis program to recognize voice commands • Use the analysis of the sounds to output control values to a radio transmitter and control the car.

3. Main Code – pseudo code for the “voice controlled car” main( ) { Launch the Analog Devices audio “echo” program – a background interrupt-driven task that is given to you – you will modify this code InitFlashASM( ); // Activate the system Flash memory without // stopping audio program which uses the Flash interface too InitializePFInterfaceASM( ); // Activate the Push-button controller Launch “VDK multi-threads” to control various processes // The VDK O/S is provided as part of the VDSP IDE Thread 1 – Store batches of sound for analysis Thread 2 – Analyze previous stored sound for “commands” Thread 3 – Use previous commands to send commands to control the car Thread 4 – Check evaluation buttons for “options” Thread 5 etc

4. Another possible project We want to build a audio controller • Audio in captured using audio A/D (CODEC) • Audio out generated using audio D/A (CODEC) • Manipulate the sound quality • Push buttons to control audio controller operations – e.g. graphics equalizer • LED lights to display operation results and sound volume level (dancing lights)

5. Main Code – pseudo code for the “audio controller” main( ) { Launch the Analog Devices audio “echo” program – a background interrupt-driven task that is given to you – you will modify this code InitFlashASM( ); // Activate the system Flash memory without stopping // the audio program which uses the Flash interface too InitializePFInterfaceASM( ); // Activate the Push-button controller Wait for button1 to be pressed and released (ReadButtonASM() ), then play the sound at half-volume. Wait for button2 to be pressed and released, play the sound at normal volume When button3 is pressed -- Generate the extremely fascinating (but completely useless) dancing lights which change with the audio stream volume level Wait for button4 to be pressed and released, quit the program (turn off the sound and stop the processor) }

6. Lab. 1 – Key project interfacingMicrocontroller I/O demonstration • Your group must come into the laboratory class prepared to be able to demonstrate all of the following by the end of class period • You will make use of some of the code developed during the assignments. (Note assignments may be due AFTER the laboratory) • Initialize the Flash LED display interface (so that it works) • Write a value to the LED display • Read, and use, a value stored in the LED display, so you can test that you are getting the correct answer • Initialize the push-button controller interface • Read, and use, a value provided by the push-button controller. • Demonstrate tests to show that these operations work as required • OPTIONAL “ENCM415 Project club” :- Each laboratory will provide you with enough interface information to get a component of the voice-activated radio control car to work – if you want to put in another couple of hours work writing the necessary C++ code to make the interfaces operate correctly.

7. Task – Does my ADSP-BF533 board work?Download audio-talk-through program • If you have not already done so, download and expand ENCM415Directory2007.zip file (used in assignment 1) so that you have the correct directory. structure and test driven development environment needed for Laboratory 1. • Download and expand the files in 07CPP_Talkthrough.zip into your AudioDemo directory. • Build an AudioDemo Blackfin project in your AudioDemo directory and add the (provided) files into the project -- compile and link. • Download the executable (.dxe) file onto the BF533 processor. • Hook up your CD or IPOD output to the CJ2 stereo input. • Hook up your ear-phones to the CJ3 stereo output. • Run the AudioDemo.dxe executable and check that the talk through program is working. • This task demonstrated your ability to build VDSP Blackfin projects and run the code. The AudioDemo code (running in a thread environment) forms the basis of the (optional) voice-activate radio-controlled car project.

8. Tasks • Basic Task – develop the LED interface • Initialize the Flash memory using the Blackfin external bus interface unit (EBIU) (ASM) • Initialize the Flash memory controller of the Blackfin Evaluation Board LED’s (ASM) • Task (mainly in C++) that use the LED interface • Develop a simple counter (in C++) and display value • Write a C++ routine to write morse code values into an array • Write a routine to transfer the morse code values to the LED’s (first in C++, then ASM) • homepage.ntlworld.com/dmitrismirnov/morse-tab1.JPG

9. Task – Initialize the Programmable flag interface – 16 GPIO lines on the Blackfin • Warning – could burn out the Blackfin processor if done incorrectly • You need to set (store a known value to) a number of internal registers in the Blackfin processor core. • Other processors need equivalent GPIO control methods • Most important registers • FIO_DIR – Data DIRection – 0 for input **** • FIO_INEN – INterface ENable • FIO_FLAG_D – Programmable FLAGData register

10. Why do you need to know how to do read (load) and write (store) on internal registers? • Flag Direction register (FIO_DIR) • Used to determine if the PF bit is to be used for input or output -- WARNING SMOKE POSSIBLE ISSUE • Need to set pins PF11 to PF8 for input, leave all other pins unchanged as they may in use by other “threads” (Later Labs)

11. Registers used to control PF pins • Flag Input Enable Register • Only activate the pins you want to use (saves power in telecommunications situation) • Need to activate pins PF11 to PF8 for input, leave all other pins unchanged

12. Registers used to control PF pins • Flag Data register (FIO_FLAG_D) • Used to read the PF bits (1 or 0) • Need to read pins PF11 to PF8, ignore all other pins values

13. Task – Setting up the programmable flag interface • Follow the instructions carefully • FIO_DIR – direction register – write 0’s to bits 8, 9, 10, 11 – leave other bits unchanged (READ/AND/WRITE operations) • FIO_INEN – input enable register – write 1’s to bits 8, 9, 10, 11 – leave other bits unchanged (READ/OR/WRITE operations) • Other GPIO registers write 0’s to bits 8, 9, 10, 11 – leave other bits unchanged (READ/AND/WRITE operations) • There is a test program that will enable you to check your code – provide a screen dump of test result.

14. Task – Read the switches on the front panel • Transfer the information to the LEDs so you can demonstrate correct operations • Build Initialize_ProgrammableFlagsASM ( ) • MUST HAVE 50 pin cable connected between logic board and Blackfin for the switch values to be read correctly – otherwise always reads “1” • Logic board power supply must be turned on (or will read 1 always) • What we could do – “Simple optical transmitter” • Place a “light sensitive detector” in front of the LED on a “second” station. • Use the output of the detector as the input instead of the switch • Capture the light code signals • Print out the “morse” code transmissions on the screen of the “first” station – very basic optical transmission

15. int ReadGPIOFlags( )

16. If we wanted to get fancy we could do the following to the Talkthrough program (Task 1) • WHILE button 1 is pressed – add a mute operation – transmit 0’s • WHILE button 2 is pressed – add a gargle operation – sometimes transmit 0’s • IF both pressed – then mute operation takes precedence • After release of buttons (either order) normal operation of that button

17. If we wanted to get fancy we could do the following to the Talkthrough program Gargling operation • Need to add a simple counter that increments by 1 every 1/44000 s (each time that an audio sample is obtained) • Use the counter to turn the sound off and on every ½ s • Gargling sound is produced. • For more details – see Lab. 1 from 2006. Note that some of the function names changed between 2006 and 2007

18. Task -- Tests • There will be software tests (E-TDD) to allow you to demonstrate that your code works correctly • Note there are test executables (.dxe) available to test out your equipment • This code can be used to test the switches and the LED interface on your board.SwitchToLED.dxe • This is the final version of my code for the “fancy” audio controllerDrSmithAudioController.dxe