July 2017
Beginner to intermediate
352 pages
7h 30m
English
Content preview from Making Things Smart
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Appendix C. Espruino Assembler
As mentioned in Chapter 2, Espruino’s Web IDE has a built-in assembler.
Assembly language is a textual representation of the actual instructions that the computer executes. The ARM microcontroller in the Espruino boards executes what is called Thumb code. This is a special cut-down version of ARM assembly code that is more limited, but takes up half the code space per instruction (16 bits versus 32 bits).
A very simple Thumb function might look like this:
mov r0, #42 bx lr
This function consists of two 16-bit instructions (so it is just 4 bytes long). The first instruction loads register r0 with the number 42, and the second instruction returns from the function. If you didn’t have this, then the microcontroller ...
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