pwm 18f2431

[mackrackit]

You do not need interrupts. You should be able to read it just as you would an ADC or other hardware things. The interrupt option is just that with hardware that might be helpful.

I will try to get a chance to read through the data sheet later. I have some of these chips on order now. So maybe in a week or so I will be asking you questions.

[robertpeach]

ok thanks mack

unfortunately i still dont understand much about these interupts and how they can help me, but ill keep searching around and looking at example codes.

haha ill be as much help as possible but dont expect much!

[robertpeach]

sorry again to post here, but since i dont actually have the program yet to play with since it hasnt arrived, i cant actually trial and error anything im doing... or any basic language im picking up.

one thing i am interested in is just reading values that would be saved at a certain filename. ive looked up the filenames in the datasheets etc..

to use my specific data value would i have to convert it to var? and then use it in my calculation algorithm.

READ F69H, w0.BYTE.o 'cap1 value written to word0 byte 0
READ F67H, W0.BYTE.1 'cap2 value written to word0 byte 1
READ F65H, W0.BYTE.2 'cap3 value written to word0 byte 2

is this an incorrect way of accessing my data? im sorry i cant actually test it myself as of yet...

[mackrackit]

You have lost me.
Where is the file being saved? Are you meaning save the data to eeprom?

This page has several samples.
http://www.melabs.com/resources/samples.htm

[robertpeach]

sorry im quite bad at explaining, but ill try my best. ill check that site out as well thanks

basically its being saved in the thing called SRAM, if im correct. which is similar to normal ram but its for special functions. Basically its just implemented as static ram. with an address of F69H for CAP1BUFH, which is the place where "capture 1 register highbyte", the place where the measurement (period in my case) has been stored temporarily, till it is overwritten by the next measurement.

[robertpeach]

ok its easier than i thought... u can just right the file address in your calculation.... e.g. (F69H)/5

am i right... or wrong again? sorry picbasicpro should be here today for me to learn from trial and error... looking at example codes and old manuals on the internet only goes so far

[mackrackit]

From Micros web site

Static RAM or SRAM
Static Random Access Memory. Program memory you can Read/Write on the target board that does not need refreshing frequently.

Calling it SRAM is a little misleading.

In your case I think you have the idea. You are talking about program variables. Variables to be used inside the program. Not permanent storage.

You have for the 18Fs four variable sizes to pick from
bit, byte, word, long

near the begining of your code you will have something like

F69H  VAR  BYTE

Then you can use F69H as in your example.
The value will be erased at power down.