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Freescale Semiconductor S08 manual 3. User Interface Menu

Models: S08

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Figure 3-3. User Interface Menu

PC Control Mode

Figure 3-3. User Interface Menu

When the MCU receives a control command or PWM input data from the PC, the firmware interprets the information to take the corresponding actions. It may update the output PWM values in next PWM duty or delivery of the corresponding LED control parameter back to the PC. Three timer channels in the timer 1 module are configured to edge-aligned PWM operation mode. This generates the PWM signals for the RGB color channels.

By the proper control of the RGB channel PWM, the LED box can provide different lighting effects.

If you select the white balance mode to AUTO, the LED output gives a white color output. The firmware retains control of the RGB PWM ratio based on the preset white color. You can adjust the output brightness by pressing the + or − key in the host PC keyboard. Alternatively, you can input a green channel PWM value and the firmware calculates the blue and red PWM values to give the resultant intensity.

A demonstration display feature is available. After enabling this feature, the firmware adjusts RGB PWM so the light box switches among different preset colors, delivery fade in and fade out lighting effects, etc.

You can also set the PWM to different frequencies. At a lower PWM frequency, such as 30 Hz, the flicking phenomenon is more noticeable. This phenomenon can be minimized or removed by setting the PWM frequency to a higher value.

There are examples at the end of this section showing how to control the LED box through the host PC.

LED Lighting Control using the MC9S08AW60, Rev. 1

Freescale Semiconductor

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Freescale Semiconductor S08 manual 3. User Interface Menu

Contents

Designer Reference Manual LED Lighting Control Using the MC9S08AW60S08 Microcontrollers freescale.comPage Revision History LED Lighting Control using the MC9S08AW60Designer Reference Manual Freescale Semiconductor Revision History LED Lighting Control using the MC9S08AW60, RevDemo Setup Table of ContentsChapter IntroductionAppendix A Schematics Appendix B Bill of Materials Chapter Introduction 1.2 Features1.1 Introduction 1.4 MC9S08AW60 1.3 System OverviewFigure 1-1 . System Block Diagram Table 1-1. Devices in the MC9S08AW60/48/32/16 SeriesLED Lighting Control using the MC9S08AW60, Rev FeatureTable 1-2. Peripherals Available per Package Type MC9S08AW60Freescale Semiconductor Introduction LED Lighting Control using the MC9S08AW60, Rev2.1 Introduction Chapter Hardware DescriptionAW60 Control Board Figure 2-1. Light-Box Demo2.3 DEMO9S08AW60LED Layout 2.2 DEMO9S08AW60LED FeaturesFigure 2-2. DEMO9S08AW60LED Top Side 2.6 Reset Switch 2.5 Power2.4 Development Support 2.7 Clock Source2.9.2 LED Indicators 2.9.1 Pushbutton Switches2.9 User Options 2.9.3 ADC InterfaceTable 2-5. IIC Port 2.9.4 Other I/O ConnectorsTable 2-6. SCI Port Table 2-7. SPI PortTable 2-9. LED Light Box Interface Table 2-8. PWM PortTable 2-10. Sensor Interface Type A Table 2-12. Temperature Sensor Input Table 2-11. Sensor Interface Type HTable 2-13. User Assignable Input Table 2-13. User Assignable Input Continued 2.10 LED Driving Board2.11.1 RGB LED Chip 2.11 LED Driver Design ProceduresFigure 2-3. DC-to-DC Boost Converter and Linear LED Driver 2.11.3 Boost Converter 2.11.2 Current Sense ResistorFigure 2-4. Equations for Boost Converter Freescale Semiconductor Hardware Description LED Lighting Control using the MC9S08AW60, Rev3.1 Introduction Chapter Firmware DescriptionFigure 3-1. Firmware Flow Main Program Figure 3-2. Firmware Flow PWM Adjustment 3.2 PC Control ModeFigure 3-3. User Interface Menu 3.3 Standalone Mode Main.c 3.4 Firmware FilesMenu.c SCI.cFreescale Semiconductor Firmware Description LED Lighting Control using the MC9S08AW60, Rev4.2 Hardware and Software Setup Chapter Demo Setup4.2.1 Hardware Setup 4.2.2 PC Software SetupDemo Setup Figure 4-1. Echo Typed Characters SettingLED Lighting Control using the MC9S08AW60, Rev 4.3.1 Demo 1 - Demonstration Display 4.3 Demo ExamplesFigure 4-2. LED Control Menu 4.3.3 Demo 3 - Auto White Balance Control 4.3.2 Demo 2 - Preset Colors Display4.3.4 Demo 4 - PWM Output Frequency Control 4.3.5 Demo 5 - Full Manual Control4.4 Program the MCU Flash 4.5 TroubleshootingRepeat the PC software setup procedures again LED Lighting Control using the MC9S08AW60, Rev Appendix A SchematicsFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevLED Lighting Control using the MC9S08AW60, Rev Appendix B Bill of MaterialsTable 4-1 BOM for AW60 Control Board LED Lighting Control using the MC9S08AW60, RevPart Description QuantityPart Description Table 4-2 BOM for LED Driving BoardValue DesignatorsFreescale Semiconductor LED Lighting Control using the MC9S08AW60, RevPage Home Page How to Reach UsE-mail USA/Europe or Locations Not Listed