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Discussion Groups | Analog Devices DSPs | Doubt - Blackfin Serial Port
Technical discussions related to Analog Devices DSPs (including Blackfin, TigerSHARC, SHARC and ADSP-21xx DSPs).
Doubt - Blackfin Serial Port - Vikas Chandra Rao - May 11 8:48:00 2004
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Dear Sir/Madam,
We are using BF531 DSP for our
application. We want to use serial port(SPORT1) as a counter. So, we have given
an external clock for TSCLK1 pin. We want to divide it by 8 and give the output to TFS1
pin. We have made the register settings as follows. Still we are not able to get any output
from TFS1 pin. Can you please let me know how exactly should we do it? Should we pass any data
to the data register(SPORT1_TX) also? Will any
interrupt be caused by SPORT1 for this operation.
SPORT1_TFSDIV = 7;
SPORT1_RCR1 = 0x0200; SPORT1_RCR2 = 0x000F; SPORT1_TCR2 = 0x0003; SPORT1_TCR1 = 0x0201; Thanks & Regards,
Vikas.
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memory corruption - Liyju Janardhan - May 19 5:23:00 2004
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Hi, I am working on adsp-20160 processor, vdsp++ 3.0. In my application I am calling an assembly routine from C program. The assmebly function which I am calling is not an leaf function. There a call for another assmebly function from that function. For example I am using this statement: call fir(db); in the assembly routine. When I comment this statement everything is work fine. But when I uncomment it, some of the data array is getting corrupted. I am using some of call-preserved registers, but before using I am saving it and restore it back before returing. There are few interrupt which is acting during the execution of the function. Here I am using interrupt() function which save all scratch register and loop stack. My question is, (1)When I am saving and restoring I0 register do I need to do the same with the corresponding B0 and L0 registers. (2)What care should be taken with the registers when using interrupts? Please help Regards Liyju __________________________________ |
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Re: memory corruption - Mike Rosing - May 19 16:46:00 2004
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On Tue, 18 May 2004, Liyju Janardhan wrote: > My question is, (1)When I am saving and restoring I0 > register do I need to do the same with the > corresponding B0 and L0 registers. Yes. > (2)What care should be taken with the registers when > using interrupts? The simplest thing to do is to use the alternate register set in interrupts. So you set one or 2 bits in MODE1 when entering, clear them when leaving and your main program can use the primary registers with out interference. It's a very fast way to do context changes and you don't have to worry about how long it takes - it's just 2 cycles of overhead no matter how many registers you use. Patience, persistence, truth, Dr. mike |
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Re: memory corruption - Liyju Janardhan - May 21 13:04:00 2004
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My main program is C language, aslo all my isr is also written in C. C runtime model does not use alternate registers. As I have written a function in assembly which I am calling from my C program. And this assembly function is calling another assembly routine which is causing the problem of memory corruption. I have solved the problem by using a leaf fuction. I guess I can use the alternate register in my assembly function and my main program will be free to use the primary registers. Thanks for the help. Regards Liyju --- Mike Rosing <> wrote: > On Tue, 18 May 2004, Liyju Janardhan wrote: > > > My question is, (1)When I am saving and restoring > I0 > > register do I need to do the same with the > > corresponding B0 and L0 registers. > > Yes. > > > (2)What care should be taken with the registers > when > > using interrupts? > > The simplest thing to do is to use the alternate > register set > in interrupts. So you set one or 2 bits in MODE1 > when > entering, clear them when leaving and your main > program can > use the primary registers with out interference. > It's a > very fast way to do context changes and you don't > have to > worry about how long it takes - it's just 2 cycles > of overhead > no matter how many registers you use. > > Patience, persistence, truth, > Dr. mike > > _____________________________________ > /groups.php3 > > Yahoo! Groups Links __________________________________ |
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