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By Shane Avery
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Extra info for Programming and Customizing the Multicore Propeller Microcontroller
Example text
When the statement cognew(LED_Flash(16, 30, 5), @StackA) is executed, a new cog starts up to run the LED_Flash method (with the parameters 16, 30, and 5). The second parameter of cognew, @StackA, directs the new cog to its assigned workspace. The @ operator returns the address of the variable it’s attached to, so the new cog locates its workspace in the memory starting at the address of StackA. As Main executes, it starts three other cogs, each running LED_Flash with different parameters and using different workspaces; then Main runs out of code, causing the first cog (the application cog) to terminate.
Figure 2-14 shows an example of this in action. 1. SomeMethod calls LED_Flash with parameters. 2. The parameter values are “copied” into LED_Flash’s parameter variables. 3. LED_Flash references those values via their parameter names. Figure 2-14 Method call with parameters. 30 INTRODUCTION TO PROPELLER PROGRAMMING To the method, the parameters are local variables for its own use. It can read them and manipulate them without affecting anything outside of itself. In our new method, the two lines following the declaration are a different type of comment; a multiline comment.
The real delay between any two occurrences of our looped event is the time it took to start the loop iteration, plus the time to perform the event, plus our “idealized” loop delay. For our application, timing accuracy isn’t vital, but for many applications, accurate timing is a must. For example, code like the following causes a cumulative error in the moment the I/O pin toggles compared with the ideal moment in time, as seen in Fig. 2-21. Note that the Count, Duration, and Pin symbols are long variables.