6/2/2015 labs in encm415. laboratory 2 pf control, copyright m. smith, ece, university of calgary,...

04/18/23 Labs in ENCM415. Laboratory 2 PF control, Copyright M. Smith, ECE, University of Calgary, Canada

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Temperature Sensor

Laboratory 2 Part 2 – Developing the Programmable Flags Interface

Oscillator out

GND

+5V


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Tackled today What is the final laboratory product?

Each Laboratory re-uses the code from the previous laboratory

Test driven development Tests enable you to check that you code meets the “customer

requirements”

Lab. 2 details Flash Memory interface – parallel port to control system mode

display (LED) Programmable Flags – parallel port for temperature sensor and

system mode control (switches) Code needed (Re-used and new)


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Lab. 2 Part 1Blackfin BF533

Evaluation board

Assembly codeUseFixTimeASM( )

ActivateFlashASM()WriteLEDASM( )

ResetPFASM( )ReadPF8to11ASM( )

ReadPFButtonsASM( )

“C++” codeUseFixTime( )

ConvertTemperature( )FlashLED( )

Determine HighTime( ) Determine LowTime( )MeasureTemperature( )

Volume Control(Thermal sensor)

Frequency Control(Thermal sensor)

LCD screen(Notes and Tempo)

Mode control(Switches)

Mode information(LEDs)

Audio In(Synthesizer)

Audio Out(Ear-phones)

PF Pins(Programmable

Flags)

Timer Interrupt

Flash MemoryParallel Port

SPI – SerialParallel Interface

CODECInputAnd

Output


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Need to control in Lab. 2

Two stages Output – Lab. 2 Part 1

Activate Flash memory parallel interface – External device to ADSP-BF533

Use Flash parallel interface to control LEDs – part of user interface

Input – Lab. 2 Part 2 Activate programmable flag (PF) interface – Internal part of

ADSP-BF533 Use PF pins + switches to control program – part of user

interface Use PF pins + temperature sensor – input transducer –

sensor


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Lab. 2 Part 2Blackfin BF533

Evaluation board

Assembly codeUseFixTimeASM( )

ActivateFlashASM()WriteLEDASM( )

ResetPFASM( )ReadPF8to11ASM( )

ReadPFButtonsASM( )

“C++” codeUseFixTime( )

ConvertTemperature( )FlashLED( )

Determine HighTime( ) Determine LowTime( ) MeasureTemperature( )

Volume Control(Thermal sensor)

Frequency Control(Thermal sensor)

LCD screen(Notes and Tempo)

Mode control(Switches)

Mode information(LEDs)

Audio In(Synthesizer)

Audio Out(Ear-phones)

PF Pins(Programmable

Flags)

Timer Interrupt

Flash MemoryParallel Port

SPI – SerialParallel Interface

CODECInputAnd

Output


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Laboratory interface

PF Interface

SPIInterface

GNDPins

FlashMemoryInterface

Logic Lab station

LEDS

SWITCHESTEMP

SENSORTMP03


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Code Interface

Customer Test Suite CustomerTestPFInterface.doj

Code interface ushort ResetPF8to11ForInputASM(bool activeHigh);

ushort ReadPF8to11ASM(void);ushort ReadButtonsASM(void);void FlashLEDAndWasteTimeDemo(void);

unsigned int WaitTillHigh( ) , unsigned int WaitTillLow( )unsigned MeasureHighTime( ), unsigned MeasureLowTime( ) temperature4 MeasureTemperature(const unsigned short)

Step 1 Develop the ASM stubs so that you can compile, link, and run the tests linked to

PFtest.doj (These stubs can be built by cut-and-pasting from the file containing UseFixedTimeASM( ) )

Since only stubs – expect that all the tests will fail. This is just a test that the calls and the interface are correct.


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Temperature Sensor

ANALOG DEVICESTMP03

Temperature Sensor

+5V

GROUND

SIGNAL TO BLACKFIN

HIGH LOW


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ConvertTemperature(LOW, HIGH, CorF)

Need to know how long the temperature sensor is lowunsigned MeasureLowTime( )

Need to know how long the temperature sensor is highunsigned MeasureHighTime( )

Need to develop two routines ushort WaitTillLow( ) – this returns the time until

the temperature sensor voltage level goes low ushort WaitTillHigh( ) – this returns the time until

the temperature sensor voltage level goes low These routines use the routine UseFixedTime( )

you developed in Lab. 1


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Pseudo code for ushort WaitTillLow( ) ushort WaitTillLow( ) {

ushort count = 0; ushort value;

value = Read VoltageLevel of Temperature Sensor ( );

while (value = = High Voltage) { count++; UseFixedTime( SOMEVALUE); // Use this routine to use up fixed time value = Read VoltageLevel of Temperature Sensor ( ); }

return count;}

HIGH LOW


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WRONGPseudo code for unsigned MeasureLowTime( )

ushort MeasureLowTime( ) {


WaitTillLow( ); count = WaitTillHigh( ); return count;}

HIGH LOW

RIGHT ANSWERIF START MEASURING HERE

WRONG ANSWERIF START MEASURING HERE


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RIGHTPseudo code for unsigned MeasureLowTime( )



WaitTillHigh( ); WaitTillLow( );

count = WaitTillHigh( ); return count;}

HIGH LOW




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Code Interface



ushort ReadPF8to11ASM(void);void FlashLEDAndWasteTimeDemo(void);

unsigned int WaitTillHigh( ) , unsigned int WaitTillLow( )

unsigned MeasureHighTime( ), unsigned MeasureLowTime( )

temperature4 MeasureTemperature(const unsigned short)


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Laboratory interface

PF Interface

SPIInterface

GNDPins

FlashMemoryInterface

SWITCHESTEMP

SENSORTMP03

Switches used to selectCentigrade or Fahrenheit

or when to stop the program


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Programmable Flags

Series of 16 lines that connect DIRECTLY to the Blackfin CORE processor – input, output or inactive PF11 – used to read the temperature sensor voltage PF10 – used to signal “quit” the program (+5V is quit) PF09 – used to signal choice of “Centigrade / Fahrenheit

(+5V is centigrade) PF08 – used to signal “read new temperature” (one reading

every time the switch is set to +5V – not multiple readings. Other PF pins are in use (some as input and some as output)

to control the video and audio devices etc on the board. These bit values must be left UNCHANGED


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Registers used to control PF pins

ushort ResetPF8to11ForInputASM(bool activeHigh);

• Flag Direction register (FIO_DIR) Used to determine if the PF bit is to be used for input or output If handled incorrectly – can burn out the processor

Flag Input Enable Register Only activate the pins you want to use (saves power in

telecommunications situation) Flag Polarity Register (FIO_POLAR) Flag Interrupt Sensitivity Register (FIO_EDGE) Flag Mask Interrupt Registers (8 of these) Warning – there is a latency of 3 system clock cycles before any

changes in PF pins can be detected by the processor (important for very fast signals (200 MHz)


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Flag Direction register (FIO_DIR) Used to determine if the PF bit is to be used for input or

output Need to set pins PF11 to PF8 for input, leave all other pins

unchanged


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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


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Flag Polarity Register (FIO_POLAR) Set pins PF11 to PF8 for active HIGH, leave all

other pins unchanged


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Typical code

Set index register P0 to point to memory mapped register

Read the value of the register Make bits 11, 10, 9, 8 zero but leave all other bits

unchanged (AND MASK operation) Set bits 11, 10, 9, 8 to the correct values but leave all

other bits unchanged (OR MASK operation) Write back the value of the register Remember the wrong values into the register can

cause the processor core to be destroyed – so check your code carefully


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Example code using masksP0.H = hi(FIO_POLAR)P0.L = lo(FIO_POLAR) // Get the address into P0

R1 = W[P0] (Z); // Read the 16-bit FIO_POLAR Register // Why use R1 and not R0?

#define PF8to11_PolarClearMask 0xF0FFR2 = PF8to11_PolarClearMask (Z)R1 = R2 & R1 // Now PF8 to PF11 = 0, nothing else changes

// R0 (in-param) contains whether active High or active low is needed#define PF8toPF11_ActiveHIGH 0x0000#define PF8toPF11_ActiveLOW 0x0F00CC = R0 = = 1IF CC R2 = PF8toPF11_ActiveHIGHIF !CC R2 = PF8toPF11_ActiveLOWR1 = R1 | R2; // Set PF8 to PF11, nothing else changesW[P0] = R1.L // Reset the registerSSYNC


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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


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ushort ReadPF8to11ASM(void);

This routine reads the value of all the pins

Discard (mask out) all the values other than PF8 to PF11

Shift the bit values down by 8 bits so that the 4 bits PF8 to PF11 form a 4-bit number (Bits 3,2, 1, 0) that you can use as a value


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Tackled Today -- Code Interface



ushort ReadPF8to11ASM(void);ushort ReadButtonsASM(void);void FlashLEDAndWasteTimeDemo(void);

unsigned int WaitTillHigh( ) , unsigned int WaitTillLow( )

unsigned MeasureHighTime( ), unsigned MeasureLowTime( ),

temperature4 MeasureTemperature(const unsigned short)


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Problems -- key for mid-term and finalwhen dealing with switching levels



WaitTillHigh( ); WaitTillLow( );

count = WaitTillHigh( ); return count;}

HIGH LOW




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Sample mid-term problem

To come


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Information taken from Analog Devices On-line Manuals with permission http://www.analog.com/processors/resources/technicalLibrary/manuals/

Information furnished by Analog Devices is believed to be accurate and reliable. However, Analog Devices assumes no responsibility for its use or for any infringement of any patent other rights of any third party which may result from its use. No license is granted by implication or otherwise under any patent or patent right of Analog Devices. Copyright Analog Devices, Inc. All rights reserved.

6/2/2015 labs in encm415. laboratory 2 pf control, copyright m. smith, ece, university of calgary,...

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