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gets a copy of the Spin Interpreter in its own cog RAM. The new cog then starts fetching and executing tokens from the application in main RAM too, starting at the point indicated in the SpinMethod argument of the COGNEW or COGINIT command. So, at any given time, there can be up to eight cogs using their own copies of the Spin Interpreter to fetch and execute tokens from the application. How do the cogs run Propeller Assembly code Once the Propeller chip has run its boot-up procedure, the Spin Interpreter stored in the main ROM is copied to Cog 0 s RAM. This Spin Interpreter fetches chunks of the application code from the main RAM and executes it. When that code is a COGNEW AsmAddress or COGINIT AsmAddress command, the Propeller starts the designated cog, and that cog loads its cog RAM with 496 consecutive longs of data from main RAM, starting at the AsmAddress location. (This overwrites any code or data that may have been in the target cog s RAM.) The cog then executes the Assembly code directly. Can I launch a new cog from an Assembly routine Yes, you can, using the Assembly version of COGINIT. You can specify a target cog by ID, or request the next available cog. How long does it take to launch an Assembly routine into a cog Approximately 512 16 (1/clock speed) seconds. How are Spin methods similar to subroutines in other languages How are they different Spin methods are like subroutines in that they contain the instructions to perform a specific process, and can be used over and over again as needed. Unlike subroutines in languages such as BASIC, methods can be passed parameters that is, a set of temporary values used in the execution of that instance of the subroutine without having to define variables or constants globally in the program. What s the difference between global and local variables Global variables are declared with a VAR declaration and are available for use by all the methods within that object. Local variables are declared in the method declaration and can only be used in the method where they are defined. All variables, whether global or local, exist in main RAM; local does not mean the variable exists only in a certain cog s RAM.
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Note The programs that the Propeller runs may be stored permanently in an I2C external EEPROM, but not inside the Propeller. If you do not include an EEPROM chip in your design, you will not have a standalone system. The Propeller will have to be loaded with your program every time you want to use it if there is no EEPROM or if there is no program in the EEPROM.
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As you can well imagine, it takes more than one memory bank to run a parallel processing system. How does the Propeller system organize its memory banks, and how are they used What do we have access to and what is the best way to set up our programming strategies This and other related ideas are introduced in this chapter. We can better understand what we are talking about in this chapter by taking a look at Figure 5-1. Study this figure for a few seconds to get a firm idea of how the overall system is set up before we start talking about it. We need to be aware of a number of memory banks and special memory locations in the Propeller chip so that we can program it in the most efficient way possible and with as few memory-related problems as possible. Most of the memory functions are handled automatically by the nature of the architecture, and we as beginners don t
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