integrate barcode scanner in asp.net Add the Two Parameters together and put the Result back onto the Stack Push 4 Onto the Stack in Software

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Add the Two Parameters together and put the Result back onto the Stack Push 4 Onto the Stack
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Compared to the ideal case shown above of 12 instructions, the PIC18 can execute the same statement in 15 instructions, for an increase of 25 percent which is actually
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very good for any processor. For the mid-range PIC microcontroller architecture, using the push, pop, and offset push code described above would require 36 instructions, or 200 percent more. The other issue with high level languages like C that the low-end and mid-range PIC microcontrollers are not well suited for is pointers. As I ve indicated elsewhere in this book, pointers are dif cult to implement and, for most people, this is not a bad thing. The PIC18 has multiple FSR registers, which means that the stack pointer FSR can be left alone while another FSR register is used to provide the pointer function. This microcontroller processor architecture, with its large (up to 4,096 bytes) contiguous data memory space, allows for pointer use quite easily and ef ciently. Structures and unions in C require an additional FSR as well for accessing speci c elements of the data types. Again, I would recommend avoiding the low-end and midrange PIC microcontrollers for C applications that have these programming constructs. In typical C development environments, a large amount of heap space is made available. This is typically used for the statement data stack (which I have described above), but it is also used for providing space for automatic variables, including structures and unions. In all the PIC microcontroller architectures, this space is very limited and space should not be allocated, to avoid problems with the data stack running out of space. If you have worked with C and are familiar with how it works, you should be comfortable with the concept that it is almost impossible to use without pointers. Simple statements like printf, as in the following example:
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printf( Failure, Expect 0x0%04X Actual 0x0%40X , Expected, Actual);
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use pointers in them even though they are not explicitly noted. In the printf example above, everything within the double quotes ( ) is stored in memory and the pointer to this string is passed to the printf library routine. In a typical C implementation for a Harvard processor, the string in quotes is copied from program memory and stored into register memory and a pointer to it returned. Implementing this type of statement in a PIC microcontroller causes a double whammy to the application developer. The string takes up quite a bit of space in both the program memory and register memory, neither of which has much to spare. In PIC microcontroller compilers, this code should never use a pointer, although it may be reasonable to do it in the PIC18Cxx because of its large, at register space. Instead, the string in quotes should be kept in program memory, and a pointer to the string passed to the printf function should indicate that the string is not in register memory. When selecting a C compiler for the PIC microcontroller, make sure that it provides a basic interrupt handler procedure header. In this book, you will see me use the interrupt data type, which indicates that the interrupt handler code is within the procedure.
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interrupt InterruptHandler() { : // } // End InterruptHandler
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Put in Interrupt Handler Code Here
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The start of the interrupt handler procedure should save all the possible context registers by pushing them onto the stack (and popping them off). Pushing the context registers onto the stack will allow nested interrupt handlers or, in the case of the PIC18, multiple handlers to execute. Note that when implementing an interrupt handler in the mid-range chips, the w and STATUS register contents will have to be stored in a temporary register rst to avoid problems with the stack. A sample mid-range PIC microcontroller C interrupt handler starting code that pushes the context registers onto the stack could be:
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InterruptHandler movwf _w movf STATUS, w bcf STATUS, RP0 movwf _status movf _w incf FSR, f movwf INDF movf _status incf FSR, f movwf INDF movf PCLATH, w incf FSR, f movwf INDF clrf PCLATH
; ; ;
Save w and STATUS before placing on stack Make Sure Execution in Bank 0 Now, Save w onto the stack
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