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the possibility exists that an access conflict will occur if the hub transfers control to the next cog in the middle of a transfer meaning that there is a possibility of reading and writing to the shared memory in a conflicting way. The lock bits allow us to control the read/write interactions and ensure orderly program flow. (See the related discussion in the PT Help section for more information on this. We will not use the lock bits in any of the programs in this book.) The main memory (not the cog memory) consists of a total of 64KB of memory divided between 32KB of RAM and 32KB of ROM. All the cogs share the block of 32KB of main ROM. This ROM contains the Spin Interpreter, the mathematics support tables, the bitmaps for the characters for the Parallax font, and so on. For all practical purposes, we as beginners do not have to worry about this part of the memory at this time its operation is transparent to us. The interpreter is downloaded into each cog. When it is the cog s turn, its interpreter fetches tokens from the main RAM and executes them. The 32KB section of shared RAM on the Propeller chip is accessible (shared) by all eight cogs. If a cog needs to bring something to the attention of another cog, the relevant information has to be placed in this area of the memory. If certain flags are needed to alert a cog about a change in memory, it has to be placed in this part of the memory. Any information that has to be shared or accessed by more than one cog has to be placed in the shared RAM under VAR.
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Assigning Memory for a New Cog
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When you want to launch a new cog, you have to make an estimate of how much stack space (in main memory) it will need and then assign an estimated number of longs that represent the operational space for the new cog. At our current level of programming, we can say that five to ten longs are enough for short methods and that 30 to 35 will handle a good-sized method. None of the methods in this book take up more than 50 longs. All the stack space we assign for the various cogs is in main RAM. The memory for a new cog is assigned as shown in Figure 5-2.
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A New Cog Can Be Started to Run a Private or Public Method
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Once you understand the basic information in Figure 5-2, take a look at Figure 5-3, which shows an expanded version of how a new cog is launched and how the various variables play out. For more examples of the opening of cogs, see the program listing in Parts II and III of this book. The programs tend to get progressively more difficult, so it is important to start with the shorter, simpler programs if you are having difficulty understanding the code. It is important to understand exactly what each line of code does before you move on to the more complicated code.
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The Various ProPeller MeMories
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Figure 5-2
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Figure 5-3
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The how and why of Shared MeMory
The parallel processing environment has some special requirements as regards the memory provided for the system. We can reasonably expect that there will be a need for some shared memory that each of the processors in the parallel environment can access as needed. We can also reasonably expect that there is some memory assigned to each cog that does not need to have any input from any sources outside the cog. That is exactly how the memory is organized within the Propeller system. The main hub memory is shown diagrammatically in Figure 6-1. This is the application memory the memory that will contain the variables, stacks, data, and code for the program you write. The first half of the memory is RAM, and the last half is ROM.
figure 6-1 Propeller hub main memory map (from page 31 of Propeller Manual [Ver. 1.1])
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