MB9AA30N SERIES BLUEMOON-EVB_LCD 32-BIT MICROCONTROLLER APPLICATION NOTE. Fujitsu Semiconductor Design (Chengdu) Co., Ltd.

Transcription

1 Fujitsu Semiconductor Design (Chengdu) Co., Ltd. Application Note MCU-AN E BIT MICROCONTROLLER MB9AA30N SERIES BLUEMOON-EVB_LCD APPLICATION NOTE ARM and Cortex-M3 are the trademarks of ARM Limited in the EU and other countries.

2 Revision History Revision History Version Date Updated by Approved by Modifications Abel Ma First Draft This manual contains 13 pages. Specifications are subject to change without notice. For further information please contact each office. All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with sales representatives before ordering. The information, such as descriptions of function and application circuit examples, in this document are presented solely for the purpose of reference to show examples of operations and uses of FUJITSU SEMICONDUCTOR device; FUJITSU SEMICONDUCTOR does not warrant proper operation of the device with respect to use based on such information. When you develop equipment incorporating the device based on such information, you must assume any responsibility arising out of such use of the information. FUJITSU SEMICONDUCTOR assumes no liability for any damages whatsoever arising out of the use of the information. Any information in this document, including descriptions of function and schematic diagrams, shall not be construed as license of the use or exercise of any intellectual property right, such as patent right or copyright, or any other right of FUJITSU SEMICONDUCTOR or any third party or does FUJITSU SEMICONDUCTOR warrant non-infringement of any third-party's intellectual property right or other right by using such information. FUJITSU SEMICONDUCTOR assumes no liability for any infringement of the intellectual property rights or other rights of third parties which would result from the use of information contained herein. The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for use accompanying fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for use requiring extremely high reliability (i.e., submersible repeater and artificial satellite). Please note that FUJITSU SEMICONDUCTOR will not be liable against you and/or any third party for any claims or damages arising in connection with above-mentioned uses of the products. Any semiconductor devices have an inherent chance of failure. You must protect against injury, damage or loss from such failures by incorporating safety design measures into your facility and equipment such as redundancy, fire protection, and prevention of over-current levels and other abnormal operating conditions. Exportation/release of any products described in this document may require necessary procedures in accordance with the regulations of the Foreign Exchange and Foreign Trade Control Law of Japan and/or US export control laws. The company names and brand names herein are the trademarks or registered trademarks of their respective owners. Copyright 2012 Fujitsu Semiconductor Design (Chengdu) Co., Ltd. All rights reserved. MCU-AN E-10 Page 2

3 Contents Contents REVISION HISTORY... 2 CONTENTS INTRODUCTION Purpose Document Overview LCD INTRODUCTION LCD Driver Principle LCD Principle Terms Used For LCD controller Configuration of LCD Controller HARDWARE INTRODUCTION LCD Controller Overview Bluemoon EV Board Hardware FIRMWARE INTRODUCTION Firmware Overview Application Interface LcdComPin_Int(uint8_t) LcdSegPin_Int() LCD_Init() LcdDisp() LcdWriteData(uint8_t, uint8_t, uint8_t) LcdWriteColon(uint8_t) ShowWichPlaceBlink(uint8_t, uint8_t, uint8_t) Lvd_Init() USAGE NOTICE ADDITIONAL INFORMATION APPENDIX List of Figures and Tables MCU-AN E-10 Page 3

4 Chapter 1 Introduction 1 Introduction 1.1 Purpose This application note describes LCD sample codes, designed to operate the 8 COM segment LCD driver modules in bluemoon EVB which is build up in MB9AA30N series MCU. Added to that is the descriptions of how to use this sample code and some notices. Certainly, user can use it for other type LCD. 1.2 Document Overview The rest of document is organized as the following: Chapter 2 explains LCD Introduction. Chapter 3 explains Hardware Introduction. Chapter 4 explains Firmware Introduction. MCU-AN E-10 Page 4

5 Chapter 2 LCD Introduction 2 LCD Introduction LCD working principles 2.1 LCD Driver Principle LCD Principle Figure 2-1: COM and SEG signal layout Example in a LCD symbol Each symbol on LCD is controlled by no less than 1 common signal and 1 segment signals. The ON or OFF status of which symbol is determined by both common and segment outputs Terms Used For LCD controller LCD clock drives the LCD controller, Cycle of AC waveform which drives LCD. By its nature, LCD causes deterioration to its LCD elements if DC driver because the LCD elements are affected by chemical changes. To a this situation, the LCD controller incorporates AC waveform generator to generate AC waveform consisting of 2 frames: an odd frame and an even frame(inverted odd frame), allowing driving the LCD. Figure 2-2: Terms Used For LCD controller MCU-AN E-10 Page 5

6 2.2 Configuration of LCD Controller Chapter 2 LCD Introduction The LCD controller consists of the following blocks, which are divided functionally into a controller section that generates the segment and common signals based on the content of display RAM and a driver section that drives the LCD. Figure 2-3: LCD Controller Block Diagram MCU-AN E-10 Page 6

7 Chapter 3 Hardware Introduction 3 Hardware Introduction LCD hardware connection introduction 3.1 LCD Controller Overview The LCD drive voltage is generated by divider resistors, includes internal or external divider resistors, as Figure 3-1 shows Internal resistor External resistor Figure 3-1: Divider Resistor Connection The internal divider resistor consists of 10K and 100K resistors. The value of these divider resistors we should base on the detail LCD parameters. V R is an external variable resistor, connect it to adjust the voltage at pin VV Bluemoon EV Board Hardware The V R and divider resistors effect to adjust LCD brightness base on VCC. Bluemoon EV board used 3.3V or 5V power supply, so uses internal divider resistors to generate LCD drive voltage, as Figure 3-2 shows: When power supply is 5V, we used internal 10K resistors. When power supply is 3.3V, we used internal 100K resistors. We can get the power supply voltage via MCU LVD function. Figure 3-2: Bluemoon EVB Divider Resistor Connection MCU-AN E-10 Page 7

8 Chapter 4 Firmware Introduction 4 Firmware Introduction LCD firmware introduction 4.1 Firmware Overview All the parameters and functions are introduced as follow. Table 4-1: Parameters List Name s ComMap[] LCD comx actual connect to which MCU comx SegMap[] LCD segx actual connect to which MCU segx LCD_DigitBitMap[][] Display content map base on LCD which is used bluemoon evb LcdDisplayBuffer LCD display buffer PowerSupply Current EV Board power supply Table 4-2: Functions List Function s LcdComPin_Int(uint8_t) LcdSegPin_Int() Base on actual hardware connect init the com pin Base on actual hardware connect init the segment pin LCD_Init() Init LCD controller LcdDisp() Display the buffer data to LCD LcdWriteData(uint8_t, uint8_t, uint8_t) Write data to LCD display buffer LcdWriteColon(uint8_t) Write colon to LCD display buffer ShowWhichPlaceBlink(uint8_t, uint8_t, uint8_t) Appoint a place, the display is blink Lvd_Init() Init MCU LVD MCU-AN E-10 Page 8

9 Chapter 4 Firmware Introduction 4.2 Application Interface All the functions about LCD will be introduced as below, include the function prototype, input parameter(s), return value(s), and the function description LcdComPin_Int(uint8_t) Parameter LcdComPin_Int(uint8_t mode) mode: 4 4 com mode 8 8 com mode other is invalid Base on actual hardware connect init the com pin LcdSegPin_Int() Parameter LcdSegPin_Int() Base on actual hardware connect init the segment pin LCD_Init() Parameter LCD_Init() Init LCD controller LcdDisp() Parameter LcdDisp() Display the buffer data to LCD MCU-AN E-10 Page 9

10 Chapter 4 Firmware Introduction LcdWriteData(uint8_t, uint8_t, uint8_t) Parameter: LcdWriteData(uint8_t dat, uint8_t place, uint8_t point) dat: needs display data Place: place of display Point: if display radix point 1:yes other: no Write data to LCD display buffer LcdWriteColon(uint8_t) Parameter: LcdWriteColon(uint8_t place) place: display place Write colon to LCD display buffer ShowWichPlaceBlink(uint8_t, uint8_t, uint8_t) Parameter: ShowWhichPlaceBlink(uint8_t WhichPlace, uint8_t ReplaceDate1, uint8_t ReplaceDate2) Place: place of blink display ReplceDate1: need replace data in place ReplceDate2: need replace data in place+1 A point a place, the display is blink Spread Function Lvd_Init() Parameter: Lvd_Init() LVD initialization, detected voltage fall 4V, LVD interrupt Spread Function MCU-AN E-10 Page 10

11 Chapter 5 Usage Notice 5 Usage Notice The usage notice LCD Initialization Sometime the LCD segment pin is not connected corresponding to MCU segment pin (for example: LCD seg11 is used MCU seg19 pin in bluemoon EV Board). So before initialization LCD controller, user should check array ComMap[] and SegMap[][] to insure its accuracy. Driver Resistors The LCD controller has an LCD drive voltage divider resistor whose resistor value can be selected from 10kΩ or 100kΩ through software. An external divider resistor can also be used instead. LVD Function The bluemoon EV Board allows 3.3V or 5V voltage power supply and the LCD controller auto- adapt power, so should used LVD function. MCU-AN E-10 Page 11

12 Chapter 6 Additional Information 6 Additional Information For more Information on FUJITSU semiconductor products, visit the following websites: English version address: Chinese version address: MCU-AN E-10 Page 12

13 Chapter 7 Appendix 7 Appendix 7.1 List of Figures and Tables Table 4-1: Parameters List... 8 Table 4-2: Functions List... 8 Figure 2-1: COM and SEG signal layout Example in a LCD symbol... 5 Figure 2-2: Terms Used For LCD controller... 5 Figure 2-3: LCD Controller Block Diagram... 6 Figure 3-1: Divider Resistor Connection... 7 Figure 3-2: Bluemoon EVB Divider Resistor Connection... 7 MCU-AN E-10 Page 13