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Realizacja systemów wbudowanych (embeded systems) w strukturach PSoC (Programmable System on Chip)

Embeded systems

Architektura układów PSoC (Cypress)

Możliwości bloków cyfrowych i analogowych

Narzędzia programistyczno-uruchomieniowe

Wykorzystano materiały firmy Cypress

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Ogólna struktura układów PSoC (Cypress)

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Ogólna struktura układów PSoC (Cypress)

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Obudowy, końcówki

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Charakterystyka grup układów PSoC

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Zasoby systemowe układów PSoC

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Switch-mode Pump (przekształtnik podwyższający)

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Schemat systemu cyfrowego

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Możliwości konfiguracyjne bloków cyfrowych

PWMs (8 to 32 bit)

PWMs with Dead band (8 to 24 bit)

Counters (8 to 32 bit)

Timers (8 to 32 bit)

UART 8 bit with selectable parity

SPI master and slave

I2C slave, master, multi-master (1 available as a System Resource)

Cyclical Redundancy Checker/Generator (8 to 32 bit)

IrDA (up to 4)

Pseudo Random Sequence Generators (8 to 32 bit)

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Blok cyfrowy

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Organizacja części analogowej

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Organizacja części analogowej

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Blok analogowy ciągły

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Blok analogowy SC

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Wzmacniacz pomiarowy z 2 bloków ciągłych

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Wzmacniacz pomiarowy z bloków ciągłych i SC

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(regulator wentylatora)

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Narzędzia projektowe: PSoC Designer

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Narzędzia projektowe: PSoC Express

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PSoC Express : podstawowe pojęcia

Key Concepts

Drivers: Input and output drivers ....encapsulate the parameters and behavior

of various input and output devices... . Interface drivers allow your design to

communicate with an external device (currently via I2C) to implement control or

status functionality.

Valuators: Valuator elements provide the means to internally store data values.

Valuators also enable the design to convert a value from one type to another or

perform almost any intermediate processing or conditioning of data within a

PSoC design. A valuator is often used between an input and an output driver

to implement the desired behavioral logic.

Transfer Functions: ... In PSoC Express we use this term to refer to the

behavioral definition of an element that has an output. A transfer function

defines the output value of the associated design element based on the state

of other elements in the design and the type of transfer function selected.

Output drivers and valuators have an associated transfer function that defines

their behavior.

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PSoC Express : wysoki poziom abstrakcji

A central advantage of the PSoC Express design philosophy is that of hardware

abstraction; ... The PSoC Express input and output drivers handle the details of the

hardware allowing you to concentrate on the behavioral design of your project. Let’s look

at how this abstraction works with respect to a simple pushbutton...What does “On”

mean in our design, and how we will represent it?

1. Pressed (on) always means logic “0.” (?)

2. Pressed always means logic “1.” (?)

3. It doesn’t matter. (?)

The correct answer is 3, because whenever we use the pushbutton in our design, we

always use the symbolic states “On” and “Off.” The actual electrical state of the hardware

is translated into the symbolic state by the device driver (not by us). In both cases (1 or

2) the same behavioral definition for the LED can apply, specifically:

if (Input1 state is On)

then (set LED state to On)

else (set LED state to Off)

Conclusion: the drivers handle the hardware details and designs become easier to create,

verify, and re-use.

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PSoC Express : prosty przykład

First Example: Pushbutton and LED

Objectives

ƒ Select and place one input and one output driver in a design.

ƒ Demonstrate using a transfer function to determine the behavior of an output

based on the state of an input.

ƒ Use the built-in PSoC Express simulation mode to test the design

.

Design Elements

ƒ Input Driver - Pushbutton

ƒ Output Driver - LED (On/Off)

ƒ Transfer Function - Table Lookup

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PSoC Express : prosty przykład

Second Example: Potentiometer and Blinkable LED Using PriorityEncoder

Objective

ƒ Control the state of an On/Off/Blinking LED based on the position setting of

a potentiometer.

ƒ ..the creation of the logical expressions to define an output driver Priority Encoder

transfer function

ƒ Build the project – select a device, assign I/O pins and generate the HEX file

ƒ Use PSoC Programmer to program a target device.

Design Elements

ƒ Input Driver - Potentiometer

ƒ Output Driver - LED (On/Off with Blink)

ƒ Transfer Function - Priority Encoder

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PSoC Express: wejścia (przycisk,potencjometr)

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PSoC Express: wyjścia LED (On,Off; On,Off,Blink)

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PSoC Express: (przykład 1)

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PSoC Express: selectingTransfer Function

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PSoC Express: selectingTransfer Function

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PSoC Express: definingTransfer Function

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PSoC Express: defining Priority Encoder

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PSoC Express: simulation mode

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PSoC Express: wybór chipu, przypisanie końcówek

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PSoC Express: Project Builder

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PSoC Express: Programmer