AN205404 FM3 MB9AA30N Series Bluemoon-EVB_LCD.pdf

AN205404
FM3 MB9AA30N Series Bluemoon-EVB_LCD
Associated Part Family: MB9AA30N Series
This application note describes LCD sample codes, designed to operate the 8 COM segment LCD driver modules in
bluemoon EVB and also gives descriptions of how to use these sample codes.
Contents
1
2
3
Introduction .................................................................. 1
1.1 Purpose .............................................................. 1
1.2 Document Overview ............................................ 1
LCD Introduction.......................................................... 2
2.1 LCD Driver Principle ........................................... 2
2.2 Configuration of LCD Controller .......................... 3
Hardware Introduction ................................................. 4
3.1 LCD Controller Overview .................................... 4
1
Introduction
1.1
Purpose
3.2 Bluemoon EV Board Hardware ........................... 5
Firmware Introduction .................................................. 5
4.1 Firmware Overview ............................................. 5
4.2 Application Interface ........................................... 6
5 Usage Notice ............................................................... 8
6 Additional Information .................................................. 9
Document History............................................................ 10
4
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.
www.cypress.com
Document No. 002-05404 Rev. *A
1
FM3 MB9AA30N Series Bluemoon-EVB_LCD
2
LCD Introduction
LCD working principles
2.1
LCD Driver Principle
2.1.1
LCD Principle
Figure 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.
2.1.2
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 avoid
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. Terms Used for LCD Controller
www.cypress.com
Document No. 002-05404 Rev.*A
2
FM3 MB9AA30N Series Bluemoon-EVB_LCD
2.2
Configuration of LCD Controller
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 3. LCD Controller Block Diagram
www.cypress.com
Document No. 002-05404 Rev.*A
3
FM3 MB9AA30N Series Bluemoon-EVB_LCD
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 4
shows.
Figure 4. Divider Resistor Connection
Internal resistor
External resistor
The internal divider resistor consists of 10 K and 100 K resistors. The value of these divider resistors we should base
on the detail LCD parameters.
VR is an external variable resistor, connect it to adjust the voltage at pin VV4.
www.cypress.com
Document No. 002-05404 Rev.*A
4
FM3 MB9AA30N Series Bluemoon-EVB_LCD
3.2
Bluemoon EV Board Hardware
The VR and divider resistors effect to adjust LCD brightness base on VCC. Bluemoon EV board used 3.3 V or 5 V
power supply, so uses internal divider resistors to generate LCD drive voltage, as Figure 5 shows:
When power supply is 5 V, we used internal 10 K resistors.
When power supply is 3.3 V, we used internal 100 K resistors.
We can get the power supply voltage via MCU LVD function.
Figure 5. Bluemoon EVB Divider Resistor Connection
4
Firmware Introduction
LCD firmware introduction
4.1
Firmware Overview
All the parameters and functions are introduced as follow.
Table 1. Parameters List
Name
Description
Remarks
ComMap[]
LCD comx actual connect to which MCU comx
N/A
SegMap[]
LCD segx actual connect to which MCU segx
N/A
LCD_DigitBitMap[][]
Display content map base on LCD which is used bluemoon evb
N/A
LcdDisplayBuffer
LCD display buffer
N/A
PowerSupply
Current EV Board power supply
N/A
Table 2. Functions List
Prototype
Function Description
Remarks
void LcdComPin_Int(uint8_t)
Base on actual hardware connect init the com pin
N/A
void LcdSegPin_Int(void)
Base on actual hardware connect init the segment
pin
N/A
void LCD_Init(void)
Init LCD controller
N/A
void LcdDisp(void)
Display the buffer data to LCD
N/A
void LcdWriteData(uint8_t, uint8_t, uint8_t)
Write data to LCD display buffer
N/A
void LcdWriteColon(uint8_t)
Write colon to LCD display buffer
N/A
void ShowWhichPlaceBlink(uint8_t, uint8_t,
uint8_t)
Appoint a place, the display is blink
N/A
void Lvd_Init(void)
Init MCU LVD
N/A
www.cypress.com
Document No. 002-05404 Rev.*A
5
FM3 MB9AA30N Series Bluemoon-EVB_LCD
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.
4.2.1
LcdComPin_Int(uint8_t)
Prototype
void LcdComPin_Int(uint8_t mode)
mode: 4 – 4 com mode
Parameter
8 – 8 com mode
other is invalid
4.2.2
4.2.3
4.2.4
Return
void
Description
Base on actual hardware connect init the com pin
Remark
N/A
LcdSegPin_Int()
Prototype
void LcdSegPin_Int(void)
Parameter
void
Return
void
Description
Base on actual hardware connect init the segment pin
Remark
N/A
LCD_Init()
Prototype
void LCD_Init(void)
Parameter
void
Return
void
Description
Init LCD controller
Remark
N/A
LcdDisp()
Prototype
void LcdDisp(void)
Parameter
void
Return
void
Description
Display the buffer data to LCD
Remark
N/A
www.cypress.com
Document No. 002-05404 Rev.*A
6
FM3 MB9AA30N Series Bluemoon-EVB_LCD
4.2.5
LcdWriteData(uint8_t, uint8_t, uint8_t)
Prototype
void LcdWriteData(uint8_t dat, uint8_t place, uint8_t point)
dat: needs display data
Parameter:
Place: place of display
Point: if display radix point 1:yes other: no
4.2.6
4.2.7
Return
void
Description
Write data to LCD display buffer
Remark
N/A
LcdWriteColon(uint8_t)
Prototype
void LcdWriteColon(uint8_t place)
Parameter:
place: display place
Return
void
Description
Write colon to LCD display buffer
Remark
N/A
ShowWichPlaceBlink(uint8_t, uint8_t, uint8_t)
Prototype
void ShowWhichPlaceBlink(uint8_t WhichPlace, uint8_t ReplaceDate1, uint8_t ReplaceDate2)
Place: place of blink display
Parameter:
ReplceDate1: need replace data in place
ReplceDate2: need replace data in place+1
4.2.8
Return
void
Description
A point a place, the display is blink
Remark
Spread Function
L vd _ I n i t ( )
Prototype
void Lvd_Init(void)
Parameter:
void
Return
void
Description
LVD initialization, detected voltage fall 4V, LVD interrupt
Remark
Spread Function
www.cypress.com
Document No. 002-05404 Rev.*A
7
FM3 MB9AA30N Series Bluemoon-EVB_LCD
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
100 kΩ through software. An external divider resistor can also be used instead.

LVD Function
The bluemoon EV Board allows 3.3 V or 5 V voltage power supply and the LCD controller auto- adapt power, so
should used LVD function.
www.cypress.com
Document No. 002-05404 Rev.*A
8
FM3 MB9AA30N Series Bluemoon-EVB_LCD
6
Additional Information
For more information on Cypress products, please visit the following website:
http://www.cypress.com/cypress-microcontrollers
www.cypress.com
Document No. 002-05404 Rev.*A
9
FM3 MB9AA30N Series Bluemoon-EVB_LCD
Document History
Document Title: AN205404 – FM3 MB9AA30N Series Bluemoon-EVB_LCD
Document Number: 002-05404
Revision
ECN
Orig. of
Change
Submission
Date
**
-
CHMA
10/30/2012
Initial release
*A
5281405
CHMA
05/26/2016
Migrated Spansion Application Note MCU-AN-510120-E-10 to Cypress format.
www.cypress.com
Description of Change
Document No. 002-05404 Rev.*A
10
FM3 MB9AA30N Series Bluemoon-EVB_LCD
Worldwide Sales and Design Support
Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find
the office closest to you, visit us at Cypress Locations.
PSoC® Solutions
Products
ARM® Cortex® Microcontrollers
cypress.com/arm
PSoC 1 | PSoC 3 | PSoC 4 | PSoC 5LP
Automotive
cypress.com/automotive
Cypress Developer Community
Clocks & Buffers
cypress.com/clocks
Interface
cypress.com/interface
Lighting & Power Control
cypress.com/powerpsoc
Memory
cypress.com/memory
PSoC
cypress.com/psoc
Touch Sensing
cypress.com/touch
USB Controllers
cypress.com/usb
Wireless/RF
cypress.com/wireless
Forums | Projects | Videos | Blogs | Training | Components
Technical Support
cypress.com/support
PSoC is a registered trademark and PSoC Creator is a trademark of Cypress Semiconductor Corporation. All other trademarks or registered trademarks
referenced herein are the property of their respective owners.
Cypress Semiconductor
198 Champion Court
San Jose, CA 95134-1709
Phone
Fax
Website
: 408-943-2600
: 408-943-4730
: www.cypress.com
© Cypress Semiconductor Corporation, 2012-2016. This document is the property of Cypress Semiconductor Corporation and its subsidiaries, including
Spansion LLC (“Cypress”). This document, including any software or firmware included or referenced in this document (“Software”), is owned by
Cypress under the intellectual property laws and treaties of the United States and other countries worldwide. Cypress reserves all rights under such
laws and treaties and does not, except as specifically stated in this paragraph, grant any license under its patents, copyrights, trademarks, or other
intellectual property rights. If the Software is not accompanied by a license agreement and you do not otherwise have a written agreement with
Cypress governing the use of the Software, then Cypress hereby grants you a personal, non-exclusive, nontransferable license (without the right to
sublicense) (1) under its copyright rights in the Software (a) for Software provided in source code form, to modify and reproduce the Software solely for
use with Cypress hardware products, only internally within your organization, and (b) to distribute the Software in binary code form externally to end
users (either directly or indirectly through resellers and distributors), solely for use on Cypress hardware product units, and (2) under those claims of
Cypress’s patents that are infringed by the Software (as provided by Cypress, unmodified) to make, use, distribute, and import the Software solely for
use with Cypress hardware products. Any other use, reproduction, modification, translation, or compilation of the Software is prohibited.
TO THE EXTENT PERMITTED BY APPLICABLE LAW, CYPRESS MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARD
TO THIS DOCUMENT OR ANY SOFTWARE OR ACCOMPANYING HARDWARE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. To the extent permitted by applicable law, Cypress reserves the right to
make changes to this document without further notice. Cypress does not assume any liability arising out of the application or use of any product or
circuit described in this document. Any information provided in this document, including any sample design information or programming code, is
provided only for reference purposes. It is the responsibility of the user of this document to properly design, program, and test the functionality and
safety of any application made of this information and any resulting product. Cypress products are not designed, intended, or authorized for use as
critical components in systems designed or intended for the operation of weapons, weapons systems, nuclear installations, life-support devices or
systems, other medical devices or systems (including resuscitation equipment and surgical implants), pollution control or hazardous substances
management, or other uses where the failure of the device or system could cause personal injury, death, or property damage (“Unintended Uses”). A
critical component is any component of a device or system whose failure to perform can be reasonably expected to cause the failure of the device or
system, or to affect its safety or effectiveness. Cypress is not liable, in whole or in part, and you shall and hereby do release Cypress from any claim,
damage, or other liability arising from or related to all Unintended Uses of Cypress products. You shall indemnify and hold Cypress harmless from and
against all claims, costs, damages, and other liabilities, including claims for personal injury or death, arising from or related to any Unintended Uses of
Cypress products.
Cypress, the Cypress logo, Spansion, the Spansion logo, and combinations thereof, PSoC, CapSense, EZ-USB, F-RAM, and Traveo are trademarks or
registered trademarks of Cypress in the United States and other countries. For a more complete list of Cypress trademarks, visit cypress.com. Other
names and brands may be claimed as property of their respective owners.
www.cypress.com
Document No. 002-05404 Rev.*A
11
Similar pages