c# create barcode image Chip Configuration in Objective-C

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Chip Configuration
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The last point I want to make about your software is that you usually need to configure your chip as the very first part of your source code. Each processor out there has a variety of ways it can be configured. Some processors have the capability to protect the program memory so your competitors can t read it. Why would you ever want it not to be protected If you can t read it then you can t debug it, so until you have an absolute final code build, leave the memory unprotected. Most chips will also have a watchdog timer, or WDT. This timer runs in the background and when it rolls over (goes from all 1s to all 0s) it generates a WDT interrupt. The WDT interrupt may be very specific in that you don t create a WDT routine to use. So what happens When the WDT interrupt is generated the program counter is set to zero to force a processor reset. This is great to keep your code from hanging up. Unfortunately, it adds complexity to your code in that you ll need to manually reset the WDT before if overflows. Another common feature is master clear, MCLR. This is basically a reset line that you can use to reset your system. This may or may not be a good thing to have on an accessory. Think of it this way, if you provide a master reset, say, a little recessed button somewhere, then you ve said to your customers, Hey, this thing might hang up ; not a good start at establishing confidence. But what if it does hang up It s an accessory! Even the dumbest of users will disconnect then reconnect it to the iPhone to try and fix the problem (well, probably most of them). Since you ve designed it that way to reset when first connected to the iPhone dock connector you don t really need a separate reset. What else The specific things you need to configure will, of course, depend on the particular part you re using. For example, when you use the PIC16 series, you can use a number of different oscillator options. An oscillator is basically a continuous series of 1s and 0s that drive the clock input of your processor. Without an oscillator or clock input, your processor doesn t run. So you have to have it.
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CHAPTER 11: Firmware
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A PIC16, like most embedded processor chips, has an option of an internal oscillator. It s not extremely accurate, but for most cases it works fine. One thing to keep in mind, every aspect of your processor s timing is derived from this clock. If you have a specific baud rate your RS232 port needs to use, check the spec to see (1) if the clock rate you select can be divided to create that rate, and (2) if the amount of error is acceptable. What does it look like to configure the processor Here s an example configuration statement from one of my projects: __CONFIG( INTOSC & NOMCLR &NOWDT & UNPROTECT); This statement is specific to a certain PIC processor and the HI TECH C compiler. Note that the CONFIG command starts with two underscores, not one. The command specifies that you ll use the internal oscillator. There is no master clear line, the watchdog timer is not enabled, and you are not using memory protection. Also, note the semicolon at the end of the statement. All compilers work a little differently so make sure to study how to set this up. Not getting the configuration set up correctly is one of the easiest mistakes you ll make.
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Summary
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I ve tried to cover the most common issues that you ll need to address when creating the firmware for your accessory. First off, you ll more than likely want to have a Windows-based PC at your disposal for design work and firmware development. Though you could run your compiler and development environment on Windows running on a Mac, you ll find that running them on the machines they were intended for will eliminate uncertainty when problems arise. Using any of the major embedded processors, you ll likely have a choice when it comes to compilers. Try out the free ones first, but don t skimp when it comes to choosing a final compiler. While the cost difference could be as much as several hundred dollars, one compiler could save you 50% in terms of memory utilization. The several hundred dollars you might save could be easily eaten up if you need to switch processors because your compiler wasn t efficient enough. All embedded processors that you might use for accessory development come in evaluation versions that include the processor on a prototyping board, IDE and compiler tools, and lessons to get you started. This structured introduction could save you weeks of time in coming up to speed on a particular type of device. It s a must have for the beginning embedded systems developer. The firmware you wind up developing to run on your embedded processor can be constructed as a superloop using interrupts to set local program variables. Then, inside the superloop, simple if-then statements can be used to test the variables to see what processing needs to be done. It s simple and crude, but works well for the types of simple, embedded systems used in accessory design.
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