Cypress CE219490 Manuel utilisateur

CE219490 – PSoC 6 MCU Ramping LED

using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 1

Objective

This example demonstrates the flexibility of Smart I/O in PSoC®6 MCU, by implementing an LED ramping effect exclusively in

hardware with no CPU usage beyond initialization.

Requirements

Tool: ModusToolbox™IDE 1.1

Programming Language: C

Associated Parts: All PSoC 6 MCU parts

Related Hardware: PSoC 6 BLE Pioneer Kit, PSoC 6 WiFi-BT Pioneer Kit, PSoC6 WiFi-Prototyping Kit

Overview

This example uses a PWM resource and Smart I/O in PSoC 6 MCU to implement a ramping LED, where an LED gradually

cycles through increasing and decreasing brightness levels. There is no CPU usage except for the initialization of PWM and

Smart I/O.

Hardware Setup

This example uses the kit’s default configuration. See the kit guide to ensure the kit is configured correctly.

Note: The PSoC 6 BLE Pioneer kit and the PSoC 6 WiFi-BT Pioneer kit ship with KitProg2. ModusToolbox only works with

KitProg3. Before using this code example, make sure that the kit is upgraded to KitProg3. See ModusToolbox Help >

ModusToolbox IDE Documentation > User Guide; section PSoC 6 MCU KitProg Firmware Loader. If you do not upgrade, you

will see an error like “unable to find CMSIS-DAP device” or “KitProg firmware is out of date”.

Software Setup

None.

Operation

Follow the instructions that came with your kit to make sure that your kit is connected to your PC

1. Connect the kit to your PC using the provided USB cable.

2. Import the application into a new workspace. See KBA225201.

3. Build the application. Choose Project > Build All.

4. Program the PSoC 6 MCU device. In the project explorer, select the mainapp project. In the Quick Panel, scroll to the

Launches section and click the Program (KitProg3) configuration. Program configurations also build the code.

5. Using a jumper wire, connect P9[4] to P13[7].

You can observe the ramping effect on the LED connected to P13[7] on the kit.

Debugging

You can debug the example to step through the code. Use the Debug (KitProg3) configuration. If you are unfamiliar with how

to start a debug session with ModusToolbox IDE, see KBA224621.

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 2

Design and Implementation

This design consists of a PWM resource and a Smart I/O resource, both creating square waves of slightly different frequencies.

These square waves are routed through an exclusive-OR (XOR) gate within the Smart I/O resource, yielding a signal with a

gradually changing duty cycle. The rate of change is proportional to the difference between the output square wave frequencies.

The signal is then output to I/O4 of the Smart I/O port 9. Driving LED with this signal results in a “ramping” effect, where the LED

gradually get brighter and dimmer alternately.

The PWM is driven by a 10-kHz clock with a period of 399 counts and a compare value of 200 counts. This gives a 50 percent

duty cycle square wave with a 40-ms period. The Smart I/O is clocked at 99 Hz using a divided clock sourced from CLK_PERI.

This input clock is divided by 4 using the lookup tables (LUTs) of the Smart I/O resource to produce a square wave with a

40.4-ms period.

To generate a square wave signal with a time period close to 40 ms, a 99-Hz clock is divided by 4 using a synchronous sequential

circuit, which is realized using the LUTs of the Smart I/O resource.

To implement a divide-by-4 sequential circuit, consider the state transition values shown in Table 1:

Table 1. State Transition Table for a Divide-by-4 Sequential Circuit

CLK

Present State

Next State

From this state transition table, you can observe that Q0 is half the frequency of Clk_SmartIO and Q1 is 1/4th frequency of

Clk_SmartIO. This sequential logic can be implemented using the LUTs of the Smart I/O resource.

Figure 1 shows the implementation of this logic using LUT 2 and LUT 3. In addition, the divided clock is XORed with the PWM

output using LUT 4 to generate a signal with the duty cycle gradually increasing and decreasing over time. The output of LUT 4

is driven to I/O 4 output.

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 3

Figure 1. LUT Configuration and Timing Diagram

SET

CLR

99 Hz

LUT2

SET

CLR

LUT3 LUT4

chip 4 (TCPWM line) I/O 4 (LED)

99 Hz

LUT2

output

LUT3

Output

(99/4 Hz)

LUT4

output

chip 4

PWM

output

D0 D1

Q0 Q1

Resources and Settings

Table 2 lists the ModusToolbox resources used in this example, and how they are used in the design. For pin usage and

configuration, open the Pins tab of the design.modus file.

Table 2. ModusToolbox Resources

Resource

Alias

Purpose

Timer Counter PWM (TCPWM)

PWM

Generates 25 Hz, 50% duty cycle square wave

Smart I/O

SmartIO

Implements divide-by-4 sequential circuit

Digital Output Pin

Pin_LED

Provides visual feedback using the LED

Figure 2 highlights the non-default settings for the TCPWM.

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 4

Figure 2. TCPWM Configuration

Figure 3 through Figure 5 illustrate the steps for configuring Smart I/O.

Figure 3. Enabling Smart I/O

Click to Launch the

SmartIO Configurator

Enable the Smart I/O Port 9

Enable Pin P9[4]

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 5

Figure 4. Smart I/O Routing Configuration

Figure 5. LUT Configuration

LUT Output Mapping

Figure 5 depicts the LUT2 configuration settings. Similarly, configure LUT3 and LUT 4 with the settings shown in Table 3.

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 6

Table 3. Smart I/O LUT Configuration

LUT#

Mode

LUT inputs

LUT

Output

Mapping

Description

TR2

TR1

TR0

LUT2

Sequential (gated) output

LUT2

0x01

Implements a logic NOT operation

LUT3

Sequential (gated) output

LUT3

LUT2

0x81

Implements a logic XNOR operation

LUT4

Combinatorial output

LUT3

Chip 4

0x42

Implements a logic XOR operation

Figure 6 and Figure 7 show the Peripheral-Clock configuration for Smart I/O and TCPWM resources respectively.

Figure 6. Peripheral-Clock Configuration for Smart I/O

Figure 7. Peripheral-Clock Configuration for TCPWM

Reusing This Example

This example is designed for the supported kits. To port the design to a different PSoC 6 MCU device, right-click an application

project and choose Change Device. If changing to a different kit, you may need to reassign pins.

Table 4. Device and Pin Mapping Table across PSoC 6 MCU Kits

Kit Name

Device Used

LED

CY8CKIT-062-BLE

CY8C6347BZI-BLD53

P13[7]

CY8CKIT-062-WiFi-BT

CY8C6247BZI-D54

P13[7]

CY8CPROTO-062-4343W

CY8C624ABZI-D44

P13[7]

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 7

In some cases, a resource used by a code example (for example, an IP block) is not supported on another device. In that case,

the example will not work. If you build the code targeted at such a device, you will get errors. See the device datasheet for

information on what a particular device supports.

Related Documents

For a comprehensive list of PSoC 6 MCU resources, see KBA223067 in the Cypress community.

Application Notes

AN210781 –Getting Started with PSoC 6 MCU

with Bluetooth Low Energy (BLE) Connectivity

Describes PSoC 6 MCU with BLE Connectivity devices.

AN215656 –PSoC 6 MCU: Dual-CPU System

Design

Describes the dual-CPU architecture in PSoC 6 MCU, and shows how to build a simple

dual-CPU design

Code Examples

Visit the Cypress GitHub site for a comprehensive collection of code examples using ModusToolbox IDE

Device Documentation

PSoC 6 MCU: PSoC 63 with BLE Datasheet

PSoC 6 MCU: PSoC 63 with BLE Architecture Technical Reference Manual

Development Kits

CY8CKIT-062-BLE PSoC 6 BLE Pioneer Kit

CY8CKIT-062-WiFi-BT PSoC 6 WiFi-BT Pioneer Kit

CY8CPROTO-062-4343W PSoC 6 Wi-Fi BT Prototyping Kit

Tool Documentation

ModusToolbox IDE

The Cypress IDE for IoT designers

Cypress Resources

Cypress provides a wealth of data at www.cypress.com to help you to select theright device, and quickly and effectively integrate

the device into your design.

For the PSoC 6 MCU devices, see KBA223067 in the Cypress community for a comprehensive list of PSoC 6 MCU resources

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 8

Document History

Document Title: CE219490 –PSoC 6 MCU Ramping LED using Smart I/O

Document Number: 002-25568

Revision

ECN

Orig. of

Change

Submission

Date

Description of Change

6373851

VKVK

11/02/2018

New code example

6482040

VKVK

02/11/2019

Updated the project with ModusToolbox 1.1

PSoC 6 MCU Ramping LED using Smart I/O

www.cypress.com Document No. 002-25568 Rev.*A 9

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