Overview 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 LEDs (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 LEDs (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 FLAG Data 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 0s to bits
  8, 9, 10, 11 leave other bits unchanged
  (READ/AND/WRITE operations)
• FIO_INEN input enable register write 1s to
  bits 8, 9, 10, 11 leave other bits unchanged
  (READ/OR/WRITE operations)
• Other GPIO registers write 0s 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 0s
• WHILE button 2 is pressed add a gargle
  operation sometimes transmit 0s
• 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 controller  DrSmithAudioController.d
  xe