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Other Chapters. From the text by Valvano: Introduction to Embedded Systems: Interfacing to the Freescale 9S12. Chapter 8 Seril and Parallel Port Interfacing. 8.1 General Introduction Mechanical Design of Physical Components

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Other Chapters

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  1. Other Chapters From the text by Valvano: Introduction to Embedded Systems: Interfacing to the Freescale 9S12

  2. Chapter 8 Seril and Parallel Port Interfacing • 8.1 General Introduction • Mechanical Design of Physical Components • Analog and digital electronics used to connect the physical components. • Low level software that transforms the mechanical and electrical devices into objects that perform the desired tasks.

  3. 8.2 Serial Communications Interface, SCI • 8.2.1 RS232 Protocol • 8.2.2 Transmitting in Asynchronous Mode • 8.2.3 Receiving in Asynchronous Mode • 8.2.4 9S12 Details • SCI Baud Rate can be set using the SCI0BD • SCI control register is SCI0BD • Table 8.4 has more details • Program 8.1 shows initialization

  4. 8.3 Synchronous Peripheral Interface, SPI • Low-bandwidth protocol, up to 100,000 bps • 8.3.1 SPI Fundamentals • 8.3.2 SPI Details • 8.3.3 9s12DPS512 Module Routing Register (for port pin configurations) • 8.3.4 8-bit DAC (external)

  5. 8.4 Scanned Keyboards • A scanned interface has switches placed in a row/column matrix

  6. 8.5 Parallel Port LCD Interface with the HD44780 • LCD Displays are widely used and have replaced most of the “LED” interfaces.

  7. 8.6 Binary Actuators • 8.6.1 Interface • Relays, solenoids, and DC Motors have similar electrical interfaces. • There is a coil that the computer drives (or not drives) current through. • 8.6.2 Electromagnetic and Solid-state Relays

  8. 8.7 Pulse-Width Modulation • Duty cycle of a fixed frequency digital output wave is changed to provide power in a variable manner.

  9. 8.8 Stepper Motors • A motor controls the rotational position, instead of the rotational speed.

  10. Ch. 9 Interrupt Programming and Real-Time Systems • 9.1 I/O Synchronization • Software Latency • Real-Time System Definition • A system that can guarantee a worst case latency. • Software Response Time is small and bounded. • 9.2 Interrupt concepts • “An interrupt is the automatic transfer of software execution in response to a hardware event that is asynchronous with the software execution.” • 9.3 Key Wakeup Interrupts • A wakeup is an interrupt request on the rising/falling of an external input signal.

  11. Ch.9 (cont.) • 9.4 Periodic Interrupt Programming • 9.5 Real-Time Interrupt (RTI) • 9.6 Timer Overflow, Output Compare, and Input Capture • 9.7 Pulse Accumulator • 9.8 Direct Memory Access • 9.9 Hardware Debugging Tools (Logic Analyzer and In-Circuit Emulator or ICE) • 9.10 Profiling • A debugging process that collects the time history of strategic variables.

  12. Chapter 10 Numerical Calculations • 10.1 Fixed-Point Numbers • 10.2 Extended Precision Calculations • 10.3 Expression Evaluation • 10.4 IEEE Floating-Point Numbers

  13. Ch. 11 Analog I/O Interfacing • 11.1 Approximating Continuous Signals in the Digital Domain • 11.2 Digital to Analog Conversion • 11.3 Music Generation • 11.4 Analog to Digital Conversion • 11.5 Multiple Access Circular Queues • 11.6 Real-Time Data Acquisition • 11.7 Control Systems

  14. Ch. 12 Communication Systems • 12.1 Introduction • 12.2 Reentrant programming and Critical Sections • A program segment is reentrant if it can be concurrently executed by two (or more) threads. • 12.3 Interthread Communication and Synchronization • 12.4 Serial Port Interface Using Interrupt Synchronization • 12.5 Distributed Systems

  15. Ch.12 (cont.) • 12.6 Design and Implementation of a Controller Area Network (CAN) • CAN is a high-integrity serial data communication bus that is used for real-time applications. • Speeds up to 1Mbps • 12.7 Inter-Integrated Circuit (I2C) Interface • 2-wire interface (speeds up to 100-400 kpbs)—Version 1 • Version 2—speeds up to 2.4 Mbps. (not supported by 9S12) • 12.8 Wireless Communication (page 470)

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