Later tasks of Lab. 1
For more details – see the Lab. 1 web-site
There will be a 20 min prelab quiz (based on
Assignment 1 and 2) at the start of the lab. session
Print out the Lab. 1 web-pages for use as
reference during the lab. period
There will be a short 15-minute in-class
quiz at the start of the lab. period – don’t
be late
Quiz will be based on knowledge
demonstrated during assignments 1 and
2
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Task 1
Download audio-talk-through program
 If you have not already done so, download and expand
ENCM415Directory.zip file so that you have the correct directory.
structure and test driven development environment needed for
Laboratory 1.
 Download and expand the files in CPP_Talkthrough.zip into your
Lab1 directory.
 Add the CPP_Talkthrough project in your Lab. 1 directory to the
VisualDSP environment -- 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 CPP_Talkthrough.dxe executable and check that the talk
through program is working.
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Task 2 -- Convert ProcessDataCPP( ) to
ProcessDataASM () – Assign. 2 Q3
 In talkthrough.h. add a prototype for your assembly code function
Process_DataASM;
 In ISR.cpp change to
// call function that contains user code
#if 0
Process_DataCPP(); // Use the C++ version
#else
Process_DataASM(); // C assembly code routines especially developed
for Lab. 1
#endif
 Right-click on ProcessDataCPP.cpp entry. Use "FILE OPTIONS“ to exclude
linking
 Use PROJECT | clean project
 Add your ProcessDataASM.asm file to the project, recompile and link.
Check that your code works
 More details on the Lab. 1 web pages
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Set up for Tasks 1 and Task 2
AUDIO-IN
AUDIO-OUT
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How we are building the volume controller
SWITCHES ON FRONT PANEL
LED LIGHTS ON FRONT PANEL
PROGRAMMABLE FLAGS
LED-CONTROLREGISTER
FIO_FLAG_D Register
EBIU INTERFACE
int ReadSwitches( )
void WriteLED(int )
YOUR PROGRAM RUNNING ON THE BLACKFIN
ProcessDataASM( ) subroutine
IPOD
CD
A/D
A/D D/A Interrupt routine
D/A
EAR
PHONES
6 /27
Special “power-connector” for Blackfin
interface on logic lab. station
7 /27
Special “power-connector” for Blackfin
interface on logic lab. station
8 /27
Connect 50-pin cable to Blackfin
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Connect 50-pin cable to logic lab
 Make sure that
all 50-pin
connections are
secure and
proper.
 Power up the
logic lab.
station and
check that is
working
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Task 3 – Initialize the Programmable flag
interface – 16 I/O 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 Blackfin internal registers
 Most important ones
 FIO_DIR – Data DIRection – 0 for input ****
 FIO_INEN – INterface ENable
 FIO_FLAG_D – Programmable FLAG Data register
11 /27
Task 4 – Demonstration stream
 Final laboratory requirements
Wait for button1 (SW1 – PF8) to be pressed and released (ReadButtonASM() ),
then play the sound at half-volume.
Wait for button2 (SW2 – PF9) to be pressed and released, play the sound at normal
volume
Each time button3 (SW3 – PF10) is pressed and released, transfer a known value
from an array to the LED display (WriteLEDASM( ) ) and check that the expected
value is displayed (ReadLEDASM( ) )
Wait for button4 t (SW4 – PF11) o be pressed and released, quit the program (turn
off the sound and stop the processor)
 Build Initialize_ProgrammableFlagsASM ( )
 Modify main( ) and ProcessDataASM( ) so that button-operation and
volume operation works
 MUST HAVE 50 pin cable connected between logic board and
Blackfin
 Logic board power supply must be turned on
12 /27
Task 4 – Application stream
 Final laboratory requirements
 SW1 connected to PF8 -- Mute button (This task)
 SW2 connected to PF9 -- Gargle button (Task 5)
 SW3 connected to PF10 -- Volume up (Task 7)
 SW4 connected to PF11 -- Volume down (Task 7)
 Build Initialize_ProgrammableFlagsASM ( )
 Modify main( ) and ProcessDataASM( ) so that MUTE-operation
works
 MUST HAVE 50 pin cable connected between logic board and
Blackfin
 Logic board power supply must be turned on
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Task – Gargling operation – Application
stream
 Need to add a simple counter that increments by 1 every
1/44000 s
 Use the counter to turn the sound off and on every ½ s
 Gargling sound is produced.
 You need to have a signed demo sheet from a 2nd or 4th
year student. Bonus if not from department
 Plan ahead – remember that mute button overrides
gargle operation
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Gargle and Mute – Application stream
int main( ) {
InitializeSwitchInterface( );
InitializeLEDInterface( );
#define SWITCHBITS 0x0F00
// Check Lab. 1 for “exact name needed”
// Looking in MIPs notes about
//
using a mask and the
//
AND bit-wise operation
//
to select “desired bits”
while (1) {
// Forever loop
int switch_value = ReadProgrammableFlagsASM( );
// if switch 1 is on – set volatile mute_on = 1;
//
other wise set mute_on = 0;
// Variables used by modified ProcessSoundASM()
// if switch 2 is on – set volatile cause_gargle = 1;
//
other wise set cause_gargle = 0
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Application stream
Task code --- mute button
File “interruptservice.cpp”
PSEUDO CODE
extern volatile boolean mute_on;
void Process_DataASM(void);
extern volatile boolean mute_on;
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
void Process_DataASM(void) {
if (mute_on = = FALSE)
MakeTheSound( );
}
Process_DataASM( );
// Make the sound occur
…….. // Lots of more good stuff;
}
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WORRY ABOUT WHAT EX_INTERRUPT_HANDLER( ) MEANS IN LAB. 2
Task code – Gargle – Application stream
File “interruptservice.cpp”
void Process_DataASM(void) {
if (mute_on = = FALSE)
extern volatile boolean mute_on;
extern volatile boolean cause_gargle;
extern volatile int gargle_on;
void Process_DataASM(void);
}
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
Some how we want to do the following
Process_DataASM( );
// Make the sound occur
…….. // Lots of more good stuff;
}
if (gargle_on == 0)
MakeTheSound( );
Is cause_gargle is true – no sound for ½ s and
then sound for ½ s
Do this by changing gargle_on from 1 to 0 to 1 at
½ s intervals?
How? Will the code ALWAYS still work after
“both buttons” are released, only work 50%
of the time
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WORRY ABOUT WHAT EX_INTERRUPT_HANDLER( ) MEANS IN LAB. 2
Profound Procrastination Programming
– Application stream
File “interruptservice.cpp”
File “interruptservice.cpp”
extern volatile boolean mute_on;
extern volatile boolean cause_gargle;
extern volatile int gargle_on;
void Process_DataASM(void);
extern volatile boolean mute_on;
extern volatile boolean cause_gargle;
extern volatile int gargle_on;
void Process_DataASM(void);
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
Process_DataASM( );
// Make the sound occur
if (cause_gargle == TRUE)
TurnGargleOnThenOff( )
else gargle_on = 0;
…….. // Lots of more good stuff;
Process_DataASM( );
// Make the sound occur
}
…….. // Lots of more good stuff;
}
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WORRY ABOUT WHAT EX_INTERRUPT_HANDLER( ) MEANS IN LAB. 2
Profound Procrastination Programming
– Application stream
This interrupt routine is executed every
1 / 44000 s
For 22000 of those times we want
gargle_on
For the next 220 of those times we want
the gargle off
File “interruptservice.cpp”
extern volatile boolean mute_on;
extern volatile boolean cause_gargle;
extern volatile int gargle_on;
void Process_DataASM(void);
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
So we develop a counter
if (cause_gargle == TRUE)
TurnGargleOnThenOff( )
else gargle_on = 0;
Process_DataASM( );
// Make the sound occur
…….. // Lots of more good stuff;
}
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WORRY ABOUT WHAT EX_INTERRUPT_HANDLER( ) MEANS IN LAB. 2
Profound Procrastination Programming
– Application stream
extern volatile int gargle_on;
void TurnGargleOnThenOff( ) {
static long int count = 0;
count = count + 1;
if (count >= 22000) {
count = 0;
File “interruptservice.cpp”
extern volatile boolean mute_on;
extern volatile boolean cause_gargle;
extern volatile int gargle_on;
void Process_DataASM(void);
EX_INTERRUPT_HANDLER(Sport0_RX_ISR)
{
…….. /// Lots of good stuff
if (cause_gargle == TRUE)
TurnGargleOnThenOff( )
else gargle_on = 0;
gargle_on = 1 – gargle_on);
}
Process_DataASM( );
// Make the sound occur
}
Check web-pages to see if
TurnGargleOnThenOff( ) is to be
written in assembly code or in
C++
…….. // Lots of more good stuff;
}
20 /27
WORRY ABOUT WHAT EX_INTERRUPT_HANDLER( ) MEANS IN LAB. 2
Task 6 – LED interface and Dancing
Lights
LED interface setup code provided
Check that you can read switches and
make the values appear on the LED
Then – writing in “C++” code (interfaced to
your assembly code) – display the
amplitude (absolute value) of the sound
21 /27
LED interface and Dancing Lights
 LED interface setup code provided
 Demo stream
Transfer values from a known array to the LED
 Application stream
 Writing in “C++” code (interfaced to your assembly
code) – display the amplitude (absolute value) of the
sound – will need to store 32 values in an array and
generate (running) average
22 /27
Solving Lab. 1 Task Dancing lights
– Application stream
Many different ways – you and your
partner work one out
One of the ways is to “call a C++ function”
from inside your assembly code routine
ProcessDataASM( ).
How to do that was handled in Assignment 2
and also provided in detail on the web-pages
23 /27
Task Application stream – Volume control
 Writing in C++, develop the final volume control
 Note there are test codes 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 Lab.
1. DrSmithLab1Final.dxe
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Information of the marks and what needs
to be handed in
 Hand in at the start of the Thursday tutorial
 Sec. 1 – 6th October
 Sec. 2 – 13th October (Same day as planned prelab. 2 quiz)
 Note Lab.1
 Section 1 is first session – Sept 26th
 Section 2 is second session – Oct. 3rd
 THERE ARE NO LABS ON THE MONDAY OF
THANKSGIVING
 Note Lab. 2
 Section 2 is first session – Oct. 17th
 Section 1 is second session – Oct 24th
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