Textbook in PDF format

Introduction to ARM Assembler is a 200-page booklet focused on the use and construction of the computer software tool known as Raspbery Pi. It includes an extensive array of computer tools aimed at interfacing the Raspbery Pi software to a hardware computer.
Preface
Raspberry Pi Assembler
ARM Registers
Memory
Debugging
Branching
Control structures
Addressing modes
Arrays and structures
Functions
Searching and Sorting
Recursion and the Stack
Conditional Execution
Floating-Point Numbers
Real Computations
Pointers
System Calls
Local data
Inline Assembler in C Code
Thumb
Additional Topics
ASCII Standard Character Set
Integers
Matrix Multiplication (R.F.I.)
Subword Data
GPIO
Index