Download Assembly Language Programming : ARM Cortex-M3 by Vincent Mahout PDF

By Vincent Mahout

ISBN-10: 1118562127

ISBN-13: 9781118562123

ISBN-10: 1118565975

ISBN-13: 9781118565971

ISBN-10: 1848213298

ISBN-13: 9781848213296

ARM designs the cores of microcontrollers which equip so much "embedded platforms" according to 32-bit processors. Cortex M3 is the sort of designs, lately constructed by means of ARM with microcontroller purposes in brain. To conceive a very optimized piece of software program (as is frequently the case on the planet of embedded platforms) it is usually essential to understand how to application in an meeting language. This publication explains the Read more...

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Assembly Language Programming : ARM Cortex-M3

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Extra info for Assembly Language Programming : ARM Cortex-M3

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3). The assembler gives us the hexadecimal code 2511. Let us look at the ARM documentation here: the five most significant bits code the opcode, bits 8 to 10 code the register number (16-bit coding is only possible for registers R0 to R7) and the immediate value is coded on the 8 least significant bits. By taking 101 as the code for R5, we find the expected code, knowing that 0010010100010001 = 0x2511. 3. 2. An awkward case What happens if the immediate value, which we assume is unsigned in this example, exceeds 255?

The following example uses these different directives with different bases and several 38 Assembly Language Programming forms of literal expressions. 3 shows the memory mapping resulting from this example, taking 0x20000000 as the base address. 3. Mapping of the example of reservations with initialization In the example, three padding bytes are added by the assembler to allow proper alignment of the data. A byte was placed at 0x20000009 because HalfW was placed at an even address (0x2000000A) and two bytes were added at 0x2000000E because the two least significant bits of the Word address were at 0 (0X20000010).

Various and varied directives ASSERT Logic_Exp The Proper use of Assembly Directives 45 The above directive allows us to display a message (such as an error message) during the second assembly phase (an assembler takes several passes to carry out its work). If Logic_Exp is false: name CN expr allows us to rename a register in a possible coprocessor: { label } DCFSU fpliteral{,fpliteral}… which allows us to reserve initialized memory space for floating points. This implies that the program has access to floating-point calculation libraries and/or that a floating-point arithmetic unit type coprocessor is attached to the Cortex-M3 structure.

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