PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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PV198 – One-chip Controllers
LCD Display

PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
Content
1.LCD Display usage
2.LCD 1602A
3.Driver
4.Application
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PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
LCD Display usage
§Printers
§Routers
§Industrial equipment
§Consumer equipment, including some washing machines
§Much more...
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LCD 1602A – Overview
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
§LCD 1602A display driver
§HD44780U Display Controller – Datasheet
§4 bits connection
§Connection via GPIO pins (7 outputs)
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LCD 1602A – Message
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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LCD 1602A – Scheme
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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LCD 1602A – Scheme
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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MK66FN2M0 MCU
FRDM-K66F board
GND
5V
DAC0_OUT
LCD_RS
LCD_RW
LCD_E
LCD_DB4
LCD_DB5
LCD_DB6
LCD_DB7
LCD 1602A
HD44780U Display Controller
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2
3
4
5
6
7
8
9
10
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12
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VSS
VDD
V0
RS
R/W
E
DB0
DB1
DB2
DB3
DB4
DB5
DB6
DB7
GND
P5V_USB
DAC0_OUT
PTA27
PTA26
PTA4
PTA6
PTA7
PTA8
PTA9
We will use DAC output instead of potentiometer and different pins

LCD 1602A – Driver
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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§Support of the 4-bit communication initialization
§SysTick timer usage for delays
§Basic command and data transfer functions
§Does not read busy flag – uses delays instead

LCD 1602A – Driver Interface
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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§The LCD driver requires to define the following identifiers in the Pins tool for GPIO output pins:
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•LCD_RS
•LCD_RW
•LCD_E
•LCD_DB4
•LCD_DB5
•LCD_DB6
•LCD_DB7

LCD 1602A – Driver Interface
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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§The following LCD driver functions are provided:
§void LCD_4BitsInit(uint32_t systick_clk_freq, bool cursor_on, bool cursor_blinking)
§void LCD_Clear()
§void LCD_Home()
§void LCD_SetPosition(uint8_t x, uint8_t y)
§void LCD_PutChar(uint8_t character)
§void LCD_Print(char s[])
§void LCD_SendCommand(uint8_t command)
§void LCD_SendData(uint8_t data, MessageType_t messageType)
§SysTick timer is used for implementation of delay
Our task is to implement this function

Application
§LCD driver initialization
§RTC peripheral initialization
§Real date and time display demo
§Do note the pins are different  than on the image :)
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PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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Application
PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
•Initialization sequence of the LCD driver
BOARD_InitPins();
LCD_4BitsInit(BOARD_BOOTCLOCKRUN_CORE_CLOCK, false, false);
•Runtime usage of the driver (example):
LCD_SetPosition(0, 0);
LCD_Print(“a string”);


Initialization of GPIO pins (wired interface) with the generated code from the Pins tools
Initialization of the LCD driver (using core clock frequency and without cursor)
Displaying “a string” on the LCD screen at position 0,0 (the first column and first line)
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Application
§Implement function according to message format picture:
§void LCD_SendData(uint8_t data, MessageType_t messageType)
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•Bonus:
§Display floating text on the display
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PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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Homework
§Generate something else on the LCD string. (Be creative)
§The automatic tests check for initialization and if there is something on the screen
§Avoid adding drivers, will break the project.
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PV198 – One-chip Controllers, LCD Display / Dávid Danaj, Marek Neužil
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