determining pulse width

Just had a read of the document about implementing IR2175 interface with a TI dsp. This is the plan:

1. connect the current sensor to both an external interrupt pin and the capture pin.

2. configure an interrupt routine related to that interrupt pin to read both values from the capture stack and do the pulse width calculations.

To do this, i need to learn how to implement interrupt routines and possibly write user defined functions.

here are some possible useful quotes from the help files:

Scheduling and Timing

A timer interrupt is used to run generated code in real time on the C2000 DSP. Each iteration of the model solver is run after an interrupt has been posted and serviced by an interrupt service routine (ISR). The code generated for the C28x uses CPU_timer0. The code generated for the C24x uses an Event Manager (EV) timer, which you can select.

intro text

Executing code generated from Real-Time Workshop on a particular target requires that Real-Time Workshop generate target code that is tailored to the specific hardware target. Target-specific code includes I/O device drivers and interrupt service routines (ISRs). Generated source code must be compiled and linked using CCS so that it can be loaded and executed on a TI DSP. To help you to build an executable, the Embedded Target for TI C2000 DSP uses the Link for Code Composer Studio to start the code building process within CCS. Once you download your executable to your target and run it, the code runs wholly on the target. You can access the running process only from the CCS debugging tools or across a link using Link for Code Composer Studio Development Tools.

Each of the existing blocks have ISR routines in them. The capture block uses an interrrupt based on the sample time to output the values in the stack. I need to make a block that outputs the values in the stack when an external interrupt goes off.

Types of S-Functions

to start with, it seems that the easiest type of s-function to use is a Noninlined S-Functions. This may not be the most efficient code, however it is an obvious place to start.