Manuals / Freescale Semiconductor / Computer Equipment / Computer Hardware

Freescale Semiconductor S08 manual PC Control Mode, 2. Firmware Flow PWM Adjustment

Models: S08

1 46

Download 46 pages 43.71 Kb

Page 24

Figure 3-2. Firmware Flow: PWM Adjustment

Firmware Description

PWM value input to one channel

Auto White balance?

No

Yes

Prompt for green channel PWM input and calculate the two remaining channels’ PWM values according to existing color temperature

Get the other two channel values from user input

Adjust PWM width in next PWM cycle

Figure 3-2. Firmware Flow: PWM Adjustment

3.2 PC Control Mode

Every time the MCU is powered up, the firmware detects the status of SW1. The LED lighting control box is operated in PC control mode if SW1 is not being pressed.

In this mode, you control the LED output through the host PC. The MCU uses the serial communication interface (SCI) module to communicate to the COM port of the host PC.

After entering this mode, the MCU sends out a number of string characters to the PC COM port. These strings are the contents of the user interface menu displayed in the PC screen. This user interface menu guides you on how to control the LED box by different function keys. The MCU also sends out existing PWM control parameters to the host for display. For examples, parameters such as existing RGB PWM output values, white balance mode, and PWM frequency are displayed. Figure 3-3shows the PC screen for the user control menu.

LED Lighting Control using the MC9S08AW60, Rev. 1

24	Freescale Semiconductor

Image 24

Freescale Semiconductor S08 manual PC Control Mode, 2. Firmware Flow PWM Adjustment

Contents

LED Lighting Control Using the MC9S08AW60 Designer Reference ManualS08 Microcontrollers freescale.comPage LED Lighting Control using the MC9S08AW60 Revision HistoryDesigner Reference Manual Revision History LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorTable of Contents Demo SetupChapter IntroductionAppendix A Schematics Appendix B Bill of Materials 1.2 Features Chapter Introduction1.1 Introduction 1.3 System Overview 1.4 MC9S08AW60Figure 1-1 . System Block Diagram Table 1-1. Devices in the MC9S08AW60/48/32/16 SeriesFeature LED Lighting Control using the MC9S08AW60, RevTable 1-2. Peripherals Available per Package Type MC9S08AW60Introduction LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Hardware Description 2.1 IntroductionAW60 Control Board Figure 2-1. Light-Box Demo2.2 DEMO9S08AW60LED Features 2.3 DEMO9S08AW60LED LayoutFigure 2-2. DEMO9S08AW60LED Top Side 2.5 Power 2.6 Reset Switch2.4 Development Support 2.7 Clock Source2.9.1 Pushbutton Switches 2.9.2 LED Indicators2.9 User Options 2.9.3 ADC Interface2.9.4 Other I/O Connectors Table 2-5. IIC PortTable 2-6. SCI Port Table 2-7. SPI PortTable 2-8. PWM Port Table 2-9. LED Light Box InterfaceTable 2-10. Sensor Interface Type A Table 2-12. Temperature Sensor Input Table 2-11. Sensor Interface Type HTable 2-13. User Assignable Input 2.10 LED Driving Board Table 2-13. User Assignable Input Continued2.11 LED Driver Design Procedures 2.11.1 RGB LED ChipFigure 2-3. DC-to-DC Boost Converter and Linear LED Driver 2.11.2 Current Sense Resistor 2.11.3 Boost ConverterFigure 2-4. Equations for Boost Converter Hardware Description LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Firmware Description 3.1 IntroductionFigure 3-1. Firmware Flow Main Program 3.2 PC Control Mode Figure 3-2. Firmware Flow PWM AdjustmentFigure 3-3. User Interface Menu 3.3 Standalone Mode 3.4 Firmware Files Main.cMenu.c SCI.cFirmware Description LED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorChapter Demo Setup 4.2 Hardware and Software Setup4.2.1 Hardware Setup 4.2.2 PC Software SetupFigure 4-1. Echo Typed Characters Setting Demo SetupLED Lighting Control using the MC9S08AW60, Rev 4.3 Demo Examples 4.3.1 Demo 1 - Demonstration DisplayFigure 4-2. LED Control Menu 4.3.2 Demo 2 - Preset Colors Display 4.3.3 Demo 3 - Auto White Balance Control4.3.4 Demo 4 - PWM Output Frequency Control 4.3.5 Demo 5 - Full Manual Control4.5 Troubleshooting 4.4 Program the MCU FlashRepeat the PC software setup procedures again Appendix A Schematics LED Lighting Control using the MC9S08AW60, RevLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorAppendix B Bill of Materials LED Lighting Control using the MC9S08AW60, RevLED Lighting Control using the MC9S08AW60, Rev Table 4-1 BOM for AW60 Control BoardPart Description QuantityTable 4-2 BOM for LED Driving Board Part DescriptionValue DesignatorsLED Lighting Control using the MC9S08AW60, Rev Freescale SemiconductorPage How to Reach Us Home PageE-mail USA/Europe or Locations Not Listed