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Re: PIC or AVR
I Think you live in egypt, if so then using 8051 core will not help you much as the 8051 based MCUs found in egypt are mostly 89c51 and 89c52 which have very few peripherals. On the other hand you can find PIC or AVR core MCUs with lots of peripherals. I don't know what are the...
Try this one
http://usmartx.sourceforge.net/ <- this is non preemptive os
or this link
**broken link removed**
And my favorite is freertos which bobcat1 mentioned earlier.
Salam,
Shereef
ezshereef
Salam,
Take care that you can't send DTMF on mobile lines, that is to say if you played a DTMF at the mic of one side of the call and received it from the other side it will not be interpreted as a DTMF. as throwaway18 said the DTMF signals are sent on the mobile network as digital...
Re: helpppppppp
What do you mean by current technology? it's better to explain what you mean by current technology to help ppl help you.
also you can look here in EDAboard you'll find lots of great projects
Your problem is that your chip is waiting for the external oscilator to start working :D it doesn't work anymore from the internal oscilator. You can attach a crystal to the chip and program the fuse bits to internal oscilator again, then you can remove the crystal again.
Shereef
embedded system work in egypt
Hi all,
I think it will be a great chance to start a community for Embedded Engineers in Egypt we can share knowledge, experience, tools, projects and best of all to have new friends with same interests. As you all know embedded system is a passion more than it is...
Re: free rtos
hi manickam
a very good free rtos is found at
www.freertos.org
you can find the source code and very good documentation. Also it has many ports and porting it to other MCUs than the supported ones is easy.as for the rtlinux you didn't mention what do u want about it ... any way...
since you want to build a programmer by your own i suggest you to start with the STK200 for the AVR microcontrollers.
http://elm-chan.org/works/avrx/stk200.png
the STK200 is an in system programmer it needs very little hardware and you can use different SW to program with it ... like AVR-dude...
Hi rooftop,
Why do you prefer SPI than Serial communincation (RS-232)? i think you would give us some explanation for your preference, for sure we will appreciate it alot.
Re: Interrupt
sphinx is absolutely right in this ....
after all use interrupts to set only configurations to tell your main SW that the event has occurred
calling functions inside ISRs is not good at all SPECIALLY like the functionality that you have here which is a while(1) loop, ISRs...
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