Hi i'm a french student in high school with my classroom we work on a robot project using the psoc 5.

With my group we work on the shifting of the robot ,so we need to determinate its speed.We use as sensor a optical shaft encoder of a vex kit (the output waves form is square).

Our frequency range to measure is 0hz -400hz ,we use for test the pwm output

We use a counter and and a isr  as the topic  frequency using a counter.The main problem is we don't know how update the flag variable with the isr.

i will post in several days our program .

I hope you can help us best regards from France.

Declare a flag variable, global, before main().

unsigned char flag = 0;

main(){}

ISR file

extern unsigned char flag;

..

..

myisr( ) {

     flag = 1;

}

I do not know the typing of "extern" or is it "external", look that up in GNU

Regards, Dana.

You even do not need to modify the external file in PSoC3/5, there are macros to declare and define your own interrupt functions in c with CY_ISR_PROTO(IntFunc) and CY_ISR(IntFunc). Have a look into the "System User Guide" to be found under the "Help" in Creator 2.2.

... and: the storage-class-name is "extern" in c and "external" in assembly. Easy to mix up. (If I haven't already)

Bob

You can always place component and ISR module which will create placeholder

files to put your ISR code into.

Regards, Dana.

 why are you using cypress psoc for speed measurement and opticalsensor ? so many other techniques are there?

@YVRAO

maybe because of its universality? Interfaces?? Ease of use???

 projetsin

once attach your program