Hi
I am trying to set up a real-time program in microseconds instead of
milliseconds. I am using dynamic C. I see that they have delays in
Milliseconds. (Ex. (DelayMs) ). And also I can access the system
clock using MS_TIMER. Does anyone know of anyway to access the
system clock in microseconds? I attempted simply dividing by 1000
but I would need to use a long double for this and Dynamic C appears
to give a compile error when using long double.
Thanks
Programming in Microseconds...?
Started by ●April 20, 2004
Reply by ●April 20, 20042004-04-20
Make sure you know what to expect from Rabbit. At 22MHz, simple processor
instructions can last several microseconds, so you may have to use pure
assembly language, and program delays with counting clock cycles.
See previus post "Is rabbit too slow" - it's good starting point as what to
expect.
-----Original Message-----
From: carmengillette [mailto:gillet37@gill...]
Sent: Wednesday, April 21, 2004 3:48 AM
To: rabbit-semi@rabb...
Subject: [rabbit-semi] Programming in Microseconds...? Hi
I am trying to set up a real-time program in microseconds instead of
milliseconds. I am using dynamic C. I see that they have delays in
Milliseconds. (Ex. (DelayMs) ). And also I can access the system
clock using MS_TIMER. Does anyone know of anyway to access the
system clock in microseconds? I attempted simply dividing by 1000
but I would need to use a long double for this and Dynamic C appears
to give a compile error when using long double.
Thanks
Yahoo! Groups Links
instructions can last several microseconds, so you may have to use pure
assembly language, and program delays with counting clock cycles.
See previus post "Is rabbit too slow" - it's good starting point as what to
expect.
-----Original Message-----
From: carmengillette [mailto:gillet37@gill...]
Sent: Wednesday, April 21, 2004 3:48 AM
To: rabbit-semi@rabb...
Subject: [rabbit-semi] Programming in Microseconds...? Hi
I am trying to set up a real-time program in microseconds instead of
milliseconds. I am using dynamic C. I see that they have delays in
Milliseconds. (Ex. (DelayMs) ). And also I can access the system
clock using MS_TIMER. Does anyone know of anyway to access the
system clock in microseconds? I attempted simply dividing by 1000
but I would need to use a long double for this and Dynamic C appears
to give a compile error when using long double.
Thanks
Yahoo! Groups Links
Reply by ●April 20, 20042004-04-20
George is right, I did a project to determine the count from 3-phase power zero-crossing and I had to do all of the code in assembly and count the clocks, keeping all of the jumps equal in length for every possible execution path.
What I ended up doing is to run three separate PIC MPU (one on each phase) which ran at 40 MHZ and programmed these devices in assembly, which freed up the rabbit for doing all of the user interfacing and calculating offsets for the PIC’s to used all interconnected via RS232C.
I learned a long time ago that pre-processing saves a lot of development time and the PIC’s are not expensive to implement.
You could use all ZWorld Cores, overkill but possible!
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-----Original Message-----
From: George Georgiev
[mailto:g...@sbcglobal.net]
Sent: Tuesday, April 20, 2004 7:55
PM
To: r...@yahoogroups.com
Subject: RE: [rabbit-semi]
Programming in Microseconds...?
Make sure you know what to expect from Rabbit. At 22MHz, simple
processor
instructions can last several microseconds, so you
may have to use pure
assembly language, and program delays with
counting clock cycles.
See previus post "Is rabbit too slow" -
it's good starting point as what to
expect.
-----Original Message-----
From: carmengillette
[mailto:g...@hotmail.com]
Sent: Wednesday, April 21, 2004 3:48
AM
To: r...@yahoogroups.com
Subject: [rabbit-semi] Programming in
Microseconds...?
Hi
I am trying to set up a real-time program in
microseconds instead of
milliseconds. I am using dynamic C. I
see that they have delays in
Milliseconds. (Ex. (DelayMs) ). And
also I can access the system
clock using MS_TIMER. Does anyone know of
anyway to access the
system clock in microseconds? I attempted
simply dividing by 1000
but I would need to use a long double for this and
Dynamic C appears
to give a compile error when using long
double.
Thanks
Yahoo! Groups Links
