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Hi, Can you Help me about this problem: I want to have a second software uart But written in "C" and modified to work with INT0 or INT1 for detect receiver incoming data.. Maybe this i true way : www.atmel.com/.../doc3ab877f2ec329.pdf , but this code is assembler. Thanks and The Best Wishes !
Your bullet 2 is borked. You claim "is no big problem to do", but software UARTs are most definitely problematic to do. You still haven't told us what you think happens with timing in case you have other interrupts active when your software UART does its thing. What if you get an interrupt to pick up a character on the other UART when you were about to toggle the TX line of your software UART?
You shouldn't talk about "must" without actually giving a convincing argument that it is a must.
Hi again, First sorry for word "must"! I wrote that word because anybody give me suggestion instead of decision. I know microcontrollers that have mor than 1 hardware UART (i.e ARM has 4 ,infinium xc2000 has 6 and mor than), but I have situation that "have to" make software UART (with INT0 or INT1 reciving data input) for 8051 series. About "You still haven't told us what you think happens with timing in case you have other interrupts active when your software UART does its thing" for the first time I will try with interrupt priority! Thanks and have a nice day!
Does your processor support interrupts both for low-to-high and high-lo-low signal changes?
How will you time your transmissions - when to emit the start bit, the data bits and the stop bit(s)?
Yes my processor (AT89C51RD2 or AT89C55WD) has INT0 and INT1 external interrupts that supports high to low and lo to high interrupt. About transmission times for start bit , stop bits data bits on all 8051 has 3 timers and one can manage these times.
P.S Solution for my problem it's : smartdata.usbid.com/.../an446.pdf but I can't merge to work together with KEIL c51 IDE.
I can't merge to work together with KEIL c51 IDE. WHY NOT?
Erik
Because I've never been programing assembler for 8051 cpu.
Most people who complain are beginners, do not know even 1% of the programming language, do not know what it means to machine code, do not know anything Assembler or C do not even know how to find their own bugs (not even know how to program), in short, they want everything on a silver platter without minimal effort and still complain.
Honestly, do me a favor! Enter a programming course, wait a couple of decades, and return to the forum to discuss about it or even complain about something.
Regards to all, and thank those who burn their neurons for all us poor mortels.
Wait a couple of decades? You can manage lots of tasks after some months - bright students soars while the less bright spend time harvesting solutions on the net.
The decades are needed to get disillusioned by the state of mankind ;)
Most people who complain are beginners, do not know even 1% of the programming language, do not know what it means to machine code, do not know anything Assembler or C do not even know how to find their own butts
Because I've never been programing assembler for 8051 cpu
the purpose of this forum is to help others solve a specific detail of a problem, not "teach how to use Keil"
Ok ,never mind! Thanks for all answer and join! If I made this solution working,I'll post some code.
The Best Wishes!