barcode reader project in asp.net MACRO DEVELOPMENT in Software

Painting Quick Response Code in Software MACRO DEVELOPMENT

MACRO DEVELOPMENT
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else nop ; No Difference in Pages endif if (((($ + 2) & 0x00800) ^ (Label & 0x00800)) != 0) if ((($ + 2) & 0x00800) == 0) bsf PCLATH, 4 ; Label in Pages 1 else bcf PCLATH, 4 ; Label in Pages 0 endif else nop ; No Difference in endif goto (Label & 0x07FF) | ($ & 0x01800) ; endm
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Before using this macro, I would create a simple application that would test it in a variety of different situations to ensure that it worked as I expect. When designing this application, I would spend some time creating a table listing the different test cases with expected outcomes such as the ones in Table 10.6. This table only lists a few of the possible starting points and destinations that are possible. Note that the second case should produce an error because the starting address is one address away from the destination, and the macro takes up three instructions. In this case, the macro will attempt to write instructions over the instructions already placed at address 0x800. The more time you can spend debugging your macros, the better. In Table 10.6, I have only listed a few of the different test cases (ideally, cases should be created in which each of the PCLATH bits is set and reset), and no registers or bits that aren t part of the jumps are not affected. The macro is designed to work without changing the w register or the W, C, or DC bits these values should be checked before and after each invocation of the lgoto macro to make sure that this is the case. Spending time up front debugging
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TABLE 10.6
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TABLE DEVELOPED TO TEST THE OPERATION OF THE lgoto MACRO STARTING VALUES FINAL VALUES
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TEST CASE
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STARTING PC
PCLATH
ADDRESS
PCLATH
1 2 3 4 5
0x0800 0x0800 0x0800 0x0010 0x10AA
0x000 0x7FF 0x7FD 0x200 0x010
0b00 0b00 0b00 0b01 0b00
0x0800 Error 0x0800 0x0010 0x10AA
0x000 Error 0x000 0x010 0x0AA
0b01 Error 0b01 0b00 0b10
DEBUGGING MACROS
the macros will avoid the need to go back later when your code isn t behaving properly and you are trying to understand why some cases work properly and others don t. The key to debugging macros is being able to observe what changes the macro code made and whether or not they are appropriate for use in the application. This may seem to be identical to the testing done on the macro, but there is a subtle and very important difference: In macro testing, you are creating test cases and comparing the changes made to speci c registers to verify the operation of the macro. When you are observing the changes made by a macro in an application, you have to understand what the purpose of the macro was and whether or not the changes that were generated were appropriate for that point in the application. If you were debugging the lgoto macro, you might want to check to see what the execution address is after the macro s code has executed and if any other registers changed inadvertently. Ideally, you should not be setting a breakpoint at the expected destination (because there is a chance that execution would end up there at some point) but instead single-stepping through the macro s statements to make sure that there is no jump to an unexpected address. It can take some ingenuity to test the operation of the macro by seeing how it works in the application. An important key to debugging macros is being able to read what has been added to the application. When macros are expanded into the source code, the new instructions can be dif cult to see and work through. For example, when macros execute, the conditional statements (if, ifdef, ifndef, and while) may or may not be displayed depending on the operation. I think of the regular instructions of a macro statement to be print or echo statements, and they are copied into the source as is (except in the case where one of the parameter strings is present in the instruction or on the line or the assembler calculator is used to produce a speci c value). To illustrate these points, I have created conditional assembly statements for a macro:
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