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Discussion Groups | Analog Devices DSPs | Re: AW: SHARC Circular Buffers in C, Software Interrupts
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
AW: SHARC Circular Buffers in C, Software Interrupts - Christoph Ripcke - Aug 19 12:39:00 2002
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Hi Jaime, all you want to know is written in manuals but here's a short hint. circular buffers (buffer 7 example): { register unsigned int *I7 asm ( "i7" ); // index register unsigned int *L7 asm ( "l7" ); // length of buffer register unsigned int *B7 asm ( "b7" ); // base address of buffer register unsigned int *M7 asm ( "m7" ); // modifier to use /* * what U want to do */ } make sure that the compiler won't use the registers you use. In the compiler setting tabs you can list those registers. For user software interrupts have a look at library function interrupt(f,s), signal and raise. Last two are used for triggering software itnerrupts. regards Christoph -----Originalnachricht----- Von: jaime_aranguren An: Gesendet: 18.08.2002 17:03 Betreff: [adsp] SHARC Circular Buffers in C, Software Interrupts Hello, Could please anyone give me information on how to use Circular Buffers in C for the SHARC? Also need guidance on how to setup and use User Software Interrupts (in C) for the SHARC. Using VDSP++ 2.0 for SHARC. Thanks a lot -- ---------------------------------------------------- Jaime Andrés Aranguren Cardona _____________________________________ /groups.php3 |
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Re: SHARC Circular Buffers in C, Software Interrupts - bhaskar_thiagarajan - Aug 19 18:44:00 2002
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I have asked this question on this group before. The response I got indicate that the C compiler does not have any support for Circular Buffers. The macros (in macros.h) that let you do this are antique and may not work as advertised. Christoph's suggestion is pretty much inline assembly and isn't direct support in C. You are better off writing an assembly function for the routine or, implement a modulo buffer in C - it won't be as elegant and certainly doesn't use the hardware features, but may be more readable Cheers Bhaskar --- In adsp@y..., Christoph Ripcke <CRipcke@m...> wrote: > Hi Jaime, > > all you want to know is written in manuals but here's a short hint. > > circular buffers (buffer 7 example): > > { > register unsigned int *I7 asm ( "i7" ); // index > register unsigned int *L7 asm ( "l7" ); // length of buffer > register unsigned int *B7 asm ( "b7" ); // base address of buffer > register unsigned int *M7 asm ( "m7" ); // modifier to use > > /* > * what U want to do > */ > } > > make sure that the compiler won't use the registers you use. In the compiler > setting tabs you can list those registers. > For user software interrupts have a look at library function interrupt(f,s), > signal and raise. Last two are used for triggering software itnerrupts. > > regards > Christoph > -----Originalnachricht----- > Von: jaime_aranguren > An: adsp@y... > Gesendet: 18.08.2002 17:03 > Betreff: [adsp] SHARC Circular Buffers in C, Software Interrupts > > Hello, > > Could please anyone give me information on how to use Circular > Buffers in C > for the SHARC? > > Also need guidance on how to setup and use User Software Interrupts > (in C) > for the SHARC. > > Using VDSP++ 2.0 for SHARC. > > Thanks a lot > > -- > > ---------------------------------------------------- > Jaime Andrés Aranguren Cardona > jaime.aranguren@i... > jaime.aranguren@c... > > _____________________________________ > /groups.php3 |
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Re: AW: SHARC Circular Buffers in C, Software Interrupts - Jaime Andres Aranguren Cardona - Aug 19 19:11:00 2002
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Hello, Thanks for the reply. Which manuals do you refer to? The Appendix D of the legacy tools? In macros.h there are only plain C macros, not real hardware support for circular buffers. So, what could it be the performance improvement??? Furthermore, as some registers can't be used by the compiler, that could damage performance making it even worse. Please, furhter examples, explanations and "personal design success stories" are very welcomed. I must clarify, I am working with ADSP-21160M, if it maybe makes a difference. Best wishes, JaaC Christoph Ripcke wrote:Hi Jaime, all you want to know is written in manuals but here's a short hint. circular buffers (buffer 7 example): { register unsigned int *I7 asm ( "i7" ); // index register unsigned int *L7 asm ( "l7" ); // length of buffer register unsigned int *B7 asm ( "b7" ); // base address of buffer register unsigned int *M7 asm ( "m7" ); // modifier to use /* * what U want to do */ } make sure that the compiler won't use the registers you use. In the compiler setting tabs you can list those registers. For user software interrupts have a look at library function interrupt(f,s), signal and raise. Last two are used for triggering software itnerrupts. regards Christoph -----Originalnachricht----- Von: jaime_aranguren An: Gesendet: 18.08.2002 17:03 Betreff: [adsp] SHARC Circular Buffers in C, Software Interrupts Hello, Could please anyone give me information on how to use Circular Buffers in C for the SHARC? Also need guidance on how to setup and use User Software Interrupts (in C) for the SHARC. Using VDSP++ 2.0 for SHARC. Thanks a lot -- ---------------------------------------------------- Jaime Andrés Aranguren Cardona _____________________________________ /groups.php3 _____________________________________ /groups.php3 Jaime Andrés Aranguren Cardona |
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Re: Re: SHARC Circular Buffers in C, Software Interrupts - Jaime Andres Aranguren Cardona - Aug 19 19:40:00 2002
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Hello, Thanks for the advice. I have some questions. - After asking several times, what has been your approach? Could you please illustrate about that? - Does Christoph's suggestion help to improve performance? - I am aware that ciruclar buffers usage demands for register reserving to avoid usage by the C compiler. How does that affect performance? Could you please share experiences? A final clarification: I am using ADSP-21160M (SIMD DSP), if it is relevant. Cheers, JaaC bhaskar_thiagarajan wrote:I have asked this question on this group before. The response I got indicate that the C compiler does not have any support for Circular Buffers. The macros (in macros.h) that let you do this are antique and may not work as advertised. Christoph's suggestion is pretty much inline assembly and isn't direct support in C. You are better off writing an assembly function for the routine or, implement a modulo buffer in C - it won't be as elegant and certainly doesn't use the hardware features, but may be more readable Cheers Bhaskar --- In adsp@y..., Christoph Ripcke wrote: > Hi Jaime, > > all you want to know is written in manuals but here's a short hint. > > circular buffers (buffer 7 example): > > { > register unsigned int *I7 asm ( "i7" ); // index > register unsigned int *L7 asm ( "l7" ); // length of buffer > register unsigned int *B7 asm ( "b7" ); // base address of buffer > register unsigned int *M7 asm ( "m7" ); // modifier to use > > /* > * what U want to do > */ > } > > make sure that the compiler won't use the registers you use. In the compiler > setting tabs you can list those registers. > For user software interrupts have a look at library function interrupt(f,s), > signal and raise. Last two are used for triggering software itnerrupts. > > regards > Christoph > -----Originalnachricht----- > Von: jaime_aranguren > An: adsp@y... > Gesendet: 18.08.2002 17:03 > Betreff: [adsp] SHARC Circular Buffers in C, Software Interrupts > > Hello, > > Could please anyone give me information on how to use Circular > Buffers in C > for the SHARC? > > Also need guidance on how to setup and use User Software Interrupts > (in C) > for the SHARC. > > Using VDSP++ 2.0 for SHARC. > > Thanks a lot > > -- > > ---------------------------------------------------- > Jaime Andrés Aranguren Cardona > jaime.aranguren@i... > jaime.aranguren@c... > > _____________________________________ > /groups.php3 _____________________________________ /groups.php3 Jaime Andrés Aranguren Cardona |
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AW: Re: SHARC Circular Buffers in C, Software Interrupts - Christoph Ripcke - Aug 20 10:22:00 2002
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Hi Bhaskar, I don not recommend inline assembly, I recommend to hold hand on how the compiler uses the CPU registers. the only "inline" is the guidance for the compiler to name register to make it readable. After the register var declaration you can continue with plain C and make it as readable as you like to. regards Christoph P.S.: I know it was silly to declare length and modify register and pointers. Best regards from copy 'n paste -----Originalnachricht----- Von: bhaskar_thiagarajan An: Gesendet: 19.08.2002 20:44 Betreff: [adsp] Re: SHARC Circular Buffers in C, Software Interrupts I have asked this question on this group before. The response I got indicate that the C compiler does not have any support for Circular Buffers. The macros (in macros.h) that let you do this are antique and may not work as advertised. Christoph's suggestion is pretty much inline assembly and isn't direct support in C. You are better off writing an assembly function for the routine or, implement a modulo buffer in C - it won't be as elegant and certainly doesn't use the hardware features, but may be more readable Cheers Bhaskar --- In adsp@y..., Christoph Ripcke <CRipcke@m...> wrote: > Hi Jaime, > > all you want to know is written in manuals but here's a short hint. > > circular buffers (buffer 7 example): > > { > register unsigned int *I7 asm ( "i7" ); // index > register unsigned int *L7 asm ( "l7" ); // length of buffer > register unsigned int *B7 asm ( "b7" ); // base address of buffer > register unsigned int *M7 asm ( "m7" ); // modifier to use > > /* > * what U want to do > */ > } > > make sure that the compiler won't use the registers you use. In the compiler > setting tabs you can list those registers. > For user software interrupts have a look at library function interrupt(f,s), > signal and raise. Last two are used for triggering software itnerrupts. > > regards > Christoph > -----Originalnachricht----- > Von: jaime_aranguren > An: adsp@y... > Gesendet: 18.08.2002 17:03 > Betreff: [adsp] SHARC Circular Buffers in C, Software Interrupts > > Hello, > > Could please anyone give me information on how to use Circular > Buffers in C > for the SHARC? > > Also need guidance on how to setup and use User Software Interrupts > (in C) > for the SHARC. > > Using VDSP++ 2.0 for SHARC. > > Thanks a lot > > -- > > ---------------------------------------------------- > Jaime Andrés Aranguren Cardona > jaime.aranguren@i... > jaime.aranguren@c... > > _____________________________________ > /groups.php3 _____________________________________ /groups.php3 |
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