c# create barcode image 11: Firmware in Objective-C

Draw Denso QR Bar Code in Objective-C 11: Firmware

CHAPTER 11: Firmware
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The place you ll want to watch yourself is the SRAM data memory. When you re moving data around, 256 bytes can be a little tight. This 256 has got to handle all your flags, counters, variables, etc. All you have to do is to declare a 100-byte string variable and you ve eaten up nearly half your memory. Another little gotcha is that SRAM is not always purely contiguous. By that, I mean it may be broken up into banks of smaller amounts, typically 128 or 64 bytes. Again, watch out for string and array variables. Try to be frugal. How do you program your part Similar to the Xcode environment that Apple provides for developing Objective-C for the Mac and iPhone OS, Microchip provides the MPLAB IDE shown in Figure 11 2. MPLAB contains a desktop environment where you can edit files (program your code) or upload memory from your part to inspect your program and data areas. Everything is done as a project. You can configure a project using a wizard to specify which part you re using and which compiler. MPLAB allows other compilers to be used, not just HI TECH C. MPLAB works with various programmers and debugging tools. Programming is just a pushbutton away. During setup, you specify which programmer and debugger you plan to use. Some programmers, such as the PICkit 2 that comes with most of the entry-level evaluation kits, offer some amount of debugging in the form of a single breakpoint where you can have your program stop.
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Figure 11 2. Microchip s MPLAB Integrated Development Environment
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CHAPTER 11: Firmware
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Any decent IDE you use will offer a number of tutorials that will walk you through each step of the process. You ll create a project, add source files, compile, program your part, and debug your code. Most IDEs from parts manufacturers are free, but they ll only work on parts from them. More general IDEs are available that work across part types, but you ll have to pay a premium for them. NOTE: A very important thing to remember is that IDEs such as MPLAB are project based and each project should be kept in its own folder. Let me repeat that because it is that important. Keep your projects in separate folders. Never modify a project then just save it to a new name. Copy the whole folder and work on the copy. Lock anything you want to keep. The reason is that the IDE typically only saves the new project name. If you have several source files such as name1.c, name2.c, and so on, any changes to those files will be saved in the same source file meaning that you ve overwritten the good stuff. Once you re familiar with using the IDE and compiling your code, you ll want to download that program to your controller to see if it works. The first thing you ll have to do is to connect the programmer to the evaluation board. You can see the PICkit 2 connected to a Microchip evaluation board in Figure 11 3. In many cases, the evaluation boards come with multiple parts to try out. The board in Figure 11 3 actually has three different PIC controllers. Each controller will have a port for you to connect the programmer. It may or may not be clear which port goes to which part. A common error when you cannot program your part from the IDE is that you ve connected the programmer to the wrong port. Many IDEs do not give messages telling you that programming has completed successfully. What you ll see is the lack of an error message. Check your IDE manual carefully to determine what indicators it gives you. After a part is programmed, the program will immediately begin executing, usually from the start of your main() function. What I like to do is to flash an LED to indicate that the program has begun. Turn on an LED for a half a second or so, then turn it off. This lets you know your program is working and you can begin testing.
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