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Just enough information to program a Blackfin Familiarization assignment for the Analog Devices’ VisualDSP++ Integrated Development Environment
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller2 / 27 This will help to get ahead on the assignments
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller3 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller4 / 27 VisualDSP++ IDE Analog Devices’ integrated development environment (IDE) has been used in the following courses Blackfin – ADSP-BF533 ENCM415 – Assembly language and interfacing (2004) ENSF413 – Switching to Blackfin for 2008 ENCM491 – Real Time Systems (2003) ENCM511 – New project oriented microcontroller course (2008) ENEL619.23 -- High speed embedded system architectures (2004) ENEL583/589 – Many 4 th year team projects (2004) TigerSHARC – ADSP-TS201 ENCM515 – Comparative Processor Architectures for DSP (Since 1999) ENEL619.23 -- High speed embedded system architectures (2004)
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller5 / 27 Just enough to know If time today will do a demo. Build a directory :/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 assembly ASM files to the Blackfin project Compile, Link and Run using the equivalent commands as with Microsoft Visual Basic, Visual Studio etc Don’t forget to add some tests so that you know the code is working
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller6 / 27 Analog Devices CONFIGURATOR
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller7 / 27 Run VisualDSP – Add New Project
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller8 / 27 WRITE main.cpp, ADD to Project
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller9 / 27 Then BUILD (which causes a LOAD) Build and load
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller10 / 27 Then Debug | Run the code
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller11 / 27 Prepare for Assignment – C++ result
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller12 / 27 C++ Version of an assignment
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller13 / 27 “auto-increment” of a pointer. Here is how to “try” to get compiler to do it
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller14 / 27 Prepare main( ) to call assembly code and CHECK the results
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller15 / 27 We thought we needed to build the function Assignment1_ASMversion( ) However the linker is worried about not finding _Assignment1_ASMversion__Fv Build WITHOUT ADDING assembly code file Error message is VERY SPECIAL
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller16 / 27 Standard Format “Assembly code” stub assignment1ASM.asm Header info Prologue Code to return value Epilogue A “stub” provides “just enough code” not to crash the development system. It acts as a “test” for the correct call from “main()”
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller17 / 27 Result using “Assembly code” stub Exactly the result we expected
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller18 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller19 / 27 Keyword – P0 – 32-bit pointer Register 32 bit pointer register -- P0, P1, P2, P3, P4 Careful – when not in the assembler, the linker may give errors which mention p0 which stands for processor 0. The blackfin hardware can come in multi-core version (p0 and p1 for BF561) or multi-processor version.
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller20 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller21 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller22 / 27 Keyword – Memory operations 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller23 / 27 Keyword – Memory operations 8 bit memory reads are also possible B[FP + 4];
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller24 / 27 Perhaps time for a working example
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller25 / 27 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 (“address”) P0, P1, P2, P3, P4 NO 16 bit Pointer (“address”) registers You need to have 32 pointers to access 16-bit values stored ANYWHERE in the memory 32 bit Frame Pointer -- FP 32 bit Stack Pointer -- SP
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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller26 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller27 / 27 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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M. Smith -- ENCM415 Assembly Language and Interfacing on the Blackfin ADSP-BF533 microcontroller28 / 27 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 Visual Basic, Visual Studio etc Don’t forget to add some tests so that you know the code is working
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