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programmer can determine which cog will execute which portions of the application. All cogs are physically identical. Can Cog 0 be turned off Yes. Upon startup, Cog 0 is loaded with the Spin Interpreter and starts fetching and executing application code tokens from main RAM. This application code can include a command to start a Spin or Assembly process in another cog with COGNEW or COGINIT and then shut itself down with COGSTOP(0). Cog 0 can be restarted by code running in another cog. Can any cog start or stop any other cog Yes, by using COGSTOP and specifying the target cog ID. A common strategy when starting another cog is to store its ID for use in a future COGSTOP command when it s time to stop it. Can a cog shut itself down Yes. In Spin, any cog can simply use the COGSTOP(COGID) command in a method. In Assembly, it may look something like this (assuming MyID is an available register):
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Cogid MyID Cogstop MyID 'get our cog id 'terminate this cog
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Do I have to indent the lines under PUB or PRI for those lines to be part of the method No. Indenting the lines that are part of the method just makes it easier to read. Indenting is necessary to define other types of code blocks, such as REPEAT and IF. What do I have to write in my code to indicate the end of a method Nothing! You do not have to end a method with any specific command or with a blank line. The compiler knows that a method is complete when it finds the beginning of the next block declaration (CON, DAT, OBJ, PRI, PUB, or VAR) or when it reaches the end of the program listing. In sample code listings, you will probably see one or two blank lines between methods just because they are easier to read that way. Can a cog launch an assembly routine into itself Yes, it can, using COGID to identify itself (if the cog is not known) and COGINIT. If the cog was initially running Spin code, the Spin Interpreter in cog RAM will be overwritten with 496 longs from main memory, starting with the address where the desired assembly routine begins. What do I have to write in my code to indicate the end of an Assembly routine Most Assembly routines are infinite loops and don t need any end-of-routine indicator. In the rare case where you need to make an Assembly routine terminate at the end of its operation, you need to instruct it to shut down the cog that is running it. You can do this with the Assembly versions of COGID and COGSTOP. It may look something like this (assuming MyID is an available register):
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Cogid MyID Cogstop MyID 'get our cog id 'terminate this cog
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If you do not do this, you may run into strange behavior, and here s why: When an Assembly routine is launched, the cog fills its RAM with 496 longs from the main RAM, beginning at the AsmAddress specified in the COGNEW or COGINIT command. If your routine is less than 496 longs, the cog will also be slurping up whatever is in adjacent memory, which could be data, variables, or even another Assembly routine from the same DAT block. If your Assembly routine is not an endless loop, and it does not terminate by identifying its cog and shutting itself down, at the end of the routine the cog will keep going and try to execute this slurped-up data. This usually results in undesirable, and sometimes unpredictable, behavior. Since the Propeller has eight cogs, does this mean I can have up to eight object files in my Propeller application No! There is no direct relationship between objects and cogs. Applications are limited by the size of the Propeller chip s main RAM, which is 32KB (kilobytes), and not by the number of object files that make up the application. An application may consist of a single object, or many objects, as long as the total size of the application is less than 32KB. An application, whether made from one object or many objects, may execute with one, two, or up to eight cogs, depending only on the collective objects requests to launch cogs. So how many processes can the Propeller chip handle at once You can have up to eight processes executing at any one time. This does not limit your application to eight objects, eight Spin methods, or eight assembly routines, just eight processes executing code at the same time. Some processes may need to perform continuously, such as the main program loop or code that is parsing a constant stream of data. Other processes, such as those checking a slow-changing sensor or updating a message displayed on a monitor, may only need to happen once in a while, and when these are done, the cog s resources can be freed up for another process. Each cog also has two counter modules that can each handle a separate high-speed repetitive process in 32 different operation modes, monitoring or controlling up to two I/O pins each. Where does my application code live on the Propeller chip The application you write in the Propeller Tool will reside, in its binary form, in the Propeller s main RAM, not in cog RAM. Spin code is executed by the Spin Interpreter, running in a cog s RAM, which fetches and executes chunks of code, called tokens, from the PUB and PRI blocks of the application in main RAM. Assembly code is actually loaded from the application in main RAM into cog RAM and executed directly, which is why it is so much faster. How do the cogs run Spin code What does the Spin Interpreter do 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, called tokens, from the main RAM. Execution begins with the first method in the application s top object. Cog 0 fetches one or more tokens, executes the related code, then gets more tokens and continues. Whenever the application launches a new cog with COGNEW SpinMethod or COGINIT SpinMethod, that new cog also
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