just enough information to program a blackfin

Just enough information to program a Blackfin

Familiarization assignment for the Analog Devices’ VisualDSP++Integrated Development Environment

M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller

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Reminder – Tutorial tomorrow -- Thursday

Lab. Section 1 will meet in ICT320 and 318 to choose lab. partners and test equipment

This will help to get ahead on the assignments

Am looking for about 6 people to switch lab. sections to balance lab. sizesSEE ME BEFORE SWITCHING


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Tackled today

Recipe for Just in time knowledge Need a dollop of “C++” code A smizzen of knowledge to build the

simplest possible Blackfin assembly language for-loop { } and while { }

A pinch of Window’s Experience And a bowl to put the ingredients in (a

computer account with password) and somebody else to do all the clean-up (a partner) and a desk in Labs ICT318 and 320.


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VisualDSP++ IDE

Analog Devices’ integrated development environment (IDE) has been used in the following courses

Blackfin – ADSP-BF533 ENCM415 – Assembly language and interfacing (2004) ENCM491 – Real Time Systems (2003) ENEL619.23 -- High speed embedded system architectures

(2004) TigerSHARC – ADSP-TS201

ENCM515 – Comparative Processor Architectures for DSP (Since 1999)

ENEL619.23 -- High speed embedded system architectures (2004)


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Just enough to know If time today will do a demo.

Build a directory U:/ENCM415/Assignment Remember to insert the BF533 board power plug (check that lights

on board flash) Activate VisualDSP Log into a station and use Analog devices

CONFIGURATOR to set up a “BF533 session” to connect to the hardware Use VisualDSP++ and activate a Blackfin BF533 session – lights should

pause

Build a Blackfin Project, add to your directory Add your C++ files to the project Compile, Link and Run using the equivalent commands as with Microsoft

Visual Basic, Visual Studio etc

Add your ASM files to the project Compile, Link and Run using the equivalent commands as with Microsoft


Don’t forget to add some tests so that you know the code is working


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Analog Devices CONFIGURATOR


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Run VisualDSP – Add New Project


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WRITE main.cpp, ADD to Project


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Then BUILD (which causes a LOAD)

Build and load


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Then Debug | Run the code


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Prepare for Assignment – C++ result


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C++ Version of assignment


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Assignment talks about “auto-increment”. Here is how to “try” to get compiler to do it


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Prepare main( ) to call assembly codeand CHECK the results


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We thought we needed the function Assignment1_ASMversion( )

However the linker is worried about not finding _Assignment1_ASMversion__Fv

Build WITHOUT ADDING assembly code fileError message is VERY SPECIAL


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Standard Format“Assembly code” stub

Header info

Prologue

Code toreturn value

Epilogue


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Result using “Assembly code” stub

Exactly the result we expected


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Keyword – R0 – 32-bit Data Register

R0 = 7; // This returns value 7 …

Assembly code comment

End of line marker

32 bit data register -- R0, R1, R2, R3, R4, R5, R6, R7


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Keyword – P0 – 32-bit pointer Register

32 bit pointer register -- P0, P1, P2, P3, P4


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Keyword 32-bit Frame pointer

32 bit Frame pointer -- FP

As on many processors LINK and UNLINK instructions

involve hidden operations on FP and SP (stack pointer)

More on that in a later class


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Keyword – Memory operations

32 bit memory read [ ] – long-word access R0 = [FP + 4];

If FP contains the value 0x20000000 then fetch the 32-bit value starting at memory location 0x20000004 and place in data register R0


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16 bit memory read W[ ] –word access R1.H = W[FP + 28];

If FP contains the value 0x20000000 then fetch the 16-bit value starting at memory location 0x20000028 and place in data register R1.H which is the UPPER part of the register R1 (R1.H and R1.L)


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8 bit memory reads are also possible B[FP + 4];


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Perhaps time for a working example


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Programmer’s model

32 bit data register R0, R1, R2, R3, R4, R5, R6, R7

16 bit data register R0.H, R1.H, R2.H, R3.H ……. R7.H R0.L, R1.L, R2.L, R3.L ………. R7.L

32 bit Pointer register P0, P1, P2, P3, P4

NO 16 bit Pointer registers 32 bit Frame Pointer -- FP 32 bit Stack Pointer -- SP


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Memory access MUST be done via a Pointer register

32-bit Memory access Place value 0x2000 into register P1 THEN R0 = [P1] accesses (reads) the 32-bit value at

0x2000 and leaves P1 unchanged (P1 still equals 0x2000)

R0 = [P1 + 4] accesses (reads) the 32-bit value at 0x2004 and leaves P1 unchanged (P1 still equals 0x2000)

R0 = [P1++] accesses (reads) the 32-bit value at 0x2000 and autoincrements P1 by the size of a long word (4 bytes) (P1 NOW equals 0x2004)


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Memory access MUST be done via a Pointer register

16-bit Memory access Place value 0x4000 into register P2 THEN R0 = W[P2] accesses (reads) the 16-bit value

at 0x4000 and leaves P2 unchanged (P2 still equals 0x4000)

R0 = W[P2 + 4] accesses (reads) the 16-bit value at 0x4004 and leaves P2 unchanged (P2 still equals 0x4000)

R0 = W[P2++] accesses (reads) the 16-bit value at 0x4000 and autoincrements P2 by the size of a word (2 bytes) (P2 NOW equals 0x2002)


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Just enough to know If time today will do a demo.

Build a directory U:/ENCM415/Assignment Remember to insert the BF533 board power plug (check that lights

on board flash) Activate VisualDSP Log into a station and use Analog devices

CONFIGURATOR to set up a “BF533 session” to connect to the hardware Use VisualDSP++ and activate a Blackfin BF533 session – lights should

pause

Build a Blackfin Project, add to your directory Add your C++ files to the project Compile, Link and Run using the equivalent commands as with Microsoft


Add your ASM files to the project Compile, Link and Run using the equivalent commands as with Microsoft


Don’t forget to add some tests so that you know the code is working

just enough information to program a blackfin

Documents

blackfin bf533 session

blackfin project

bf533 board power plug

microsoft visual basic

hardwareuse visualdsp

time knowledge

c files

visual studio etcadd