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i want to output a sync signal which has 1s period. and i used timer for the time controling, now i encount the output problem, if i use such kind of expression > if gpio1==0 write gpio1=1 else write gpio1==0 end then it will occupy the cpu, and the output sync will not be exactly 1s, so i dont know that if your guys have better way to change the output logic lever every 1 second
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Are you using a timer interrupt, i.e. is your sample code above called from within the interrupt service routine? Furthermore, are you using the eZdspC5505 USB stick from TI? If so, you might have a look at the adaptive filter example. In this example, the XF bit (which is connected to the LED of the board) is toggled via the timer. You can find the adaptive filter example somewhere on the TI site (under google code base or something like that - I can provide you with the correct link if you need it, but currently the TI site seems to be down, so I can't check where the project is, exactly). Furthermore, it is a bit difficult to find out what you want to do. Perhaps you could include your code in the next post, or simply describe your project a bit more precisely. Cheers and regards, Michael
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first, thanks, that is definite not the sample code which i write in composer, it is just a logic expression, i will look for the project in Ti's website cheers and regards Tom
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Found that link to that audio filter example: http://c5505-ezdsp.googlecode.com/files/USB_Stick_...
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I have a further question, my timer works fine now, but there are still some other problem, i want timer output retanguler signal for the period of 1s, but my timer only interrupt for the first time, then doing nothing, i set the timer as autoload, and IRQ_clear after the interrupt of the timer, so i wana know that if there are any other thing can cause timer only load the period number for the first time
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If your interupt is generated once but then never again, try this:
Add
CSL_FINST(CSL_RTC_REGS->RTCINTFL, RTC_RTCINTFL_SECFL, SET);
to your interrupt callback function.
This macro is defined in cslr.h, which is included automatically when
you include e.g. csl.h. It writes a 1 to the flag for a "second"
interrupt (of course only if your interrupt is a periodic interrupt
which occurs every second - if not, you need to adapt that macro).
Have a look at csl_rtc_example.c (from an example project which is
included in the csl folder) to see the mentioned code in an actual
prgram.
Let me know if that helped!
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Attached files:thanks for your answer in my case,i use timer to output the pulse, and i attched my c file here.
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