.net barcode scanner sdk Figure 5-1 An overview of the Propeller memory banks in Software

Make Quick Response Code in Software Figure 5-1 An overview of the Propeller memory banks

Figure 5-1 An overview of the Propeller memory banks
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The Various ProPeller MeMories
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have to worry about what is happening where, or why. However, knowing a little bit about what is going on in the system will help you to be a better programmer. As you read this chapter, keep in mind that all eight cogs are absolutely identical in every way. Upon startup, Cog 0 is started and begins executing the first method in the top object, but after that all cogs are equal. The important thing you need to keep in mind, as you read, is the assigning of memory space for new cogs as they are launched to execute Spin code. This is not overly difficult at your current stage of the learning process for now we can just over-assign the amount of space needed and things will be okay. Once we get the program running, we can lower the amount of memory assigned to each cog a little bit at a time until the program starts to malfunction. Then we can back off a couple longs and everything will be fine. Once the code is set, you can use an object in the Propeller Tool (PT) for determining stack space needs more accurately. Things get more complicated when you start writing rather long programs (and start turning cogs on and off and keeping track of what is going on in which cog). As far as opening a new cog goes, asking for a new cog is all you need to do because they are all identical, so it does not matter which one starts next. Two KB of dedicated RAM is organized as 512 32-bit longs in each cog, called cog RAM. This is the cog s own personal RAM. This is where the Spin Interpreter is copied to from main RAM (or where Propeller Assembly code is copied to and executed) and for immediate use within the cog for internal calculations and dedicated special-purpose registers and general programming requirements. Only the cog this RAM is in can access this RAM, meaning that the cogs are insulated from each other. The only exception is the ability of one cog to pause or shut down another cog and to specify the program that the new cog is to run. All the cogs share an external 32KB of hub RAM, which is addressable as bytes, words, or longs. For our purposes, the basic use of the shared RAM is to allow the cogs to communicate among one another by sharing access to variables each of them create in this space and to hold the downloaded application. All shared variables are declared in the VAR section of this memory. If you want to share a constant, declare it in VAR and then set it to the value you want to share (from time to time, if it changes). Thirty-two input/output (I/O) pins can be accessed by all eight cogs at all times. The first cog started controls the initial clock frequency. The clock speed related registers are set in this cog at the top of the main program, along with the constants. These values are used by the main program and all objects and methods that may be called from the main program. Even if a called object sets its own oscillator speed, that speed will be overwritten by the initial frequency specified at startup in the first cog. After startup, any active cog can change the operating frequency. Setting a low clock frequency is an easy way to save energy in portable devices while they are in an inactive or dormant mode. Eight bits are used as locks to prevent memory access conflicts between the various cogs. These global bits are accessed with hub commands and are available to each cog when it has control of the system (during its turn on the hub). The lock bits are defined by the system and are used for multiple cog access control of shared memory. If more than one cog is writing to more than one 4-byte long in the shared memory at one time,
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