lcd_include.hpp File Reference

header file holding lcd controller specific information like its timing parameter, commands More...

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Macros
#define	MAX_LCD_X   15
	Max cursor x coodirnate, limited by the horizontal length of the LCD.
#define	MAX_LCD_Y   1
	Max cursor y coordinate, limited by the vertical len of LCD.
#define	COM_TIME_SCALER   7000
	too low and there might be problem as the lcd controller may not catch up More...
#define	LCD_WARM_UP_TIME_NANOSEC   49000000
	nanosec to wait for the LCD when it first wakes up
#define	LCD_FIRST_INIT_TIME_NANOSEC   4500000
	time to wait after first lcd contact
#define	LCD_SECOND_INIT_TIME_NANOSEC   150000
	time to wait after second lcd contact
#define	LCD_PULSE_WIDTH_NANOSEC   200 * COM_TIME_SCALER
	duration that the EN pin is stable high
#define	LCD_MIN_CYCLE_TIME_NANOSEC   410 * COM_TIME_SCALER
	Min time in nanosec between two rising edge of EN pin.
#define	LCD_DATA_SETUP_TIME_NANOSEC   45 * COM_TIME_SCALER
	time to hold data stable pre write transaction
#define	LCD_DATA_HOLD_TIME_NANOSEC   15 * COM_TIME_SCALER
	time to hold data stable during transaction for write
#define	LCD_ADDR_SETUP_TIME_NANOSEC   35 * COM_TIME_SCALER
	target More...
#define	LCD_ADDR_HOLD_TIME_NANOSEC   15 * COM_TIME_SCALER
	indcate target More...
#define	TIVA_MAX_RISE_TIME   13
	TIVA C max rise time for square wave if using 8mA drive strength.
#define	TIVA_MAX_FALSE_TIME   14
	TIVA C max fall time for square wave if using 8mA drive strength.
#define	LCD_DATA_WRITE_WAIT_NANOSEC   TIVA_MAX_RISE_TIME + LCD_PULSE_WIDTH_NANOSEC - (LCD_DATA_SETUP_TIME_NANOSEC)
	wait time after a write during a transaction, combines many other timing section
#define	LCD_DATA_READ_DELAY_NANOSEC   800
	nominal amount of time that the data output by the lcd controller will be available
#define	LCD_STARTUP_COMMAND   0b110000
	command to be written during the lcd wakeup
#define	LCD_BEGIN_COMMAND   0b100000
	command to be written to initiate the first configuration transaction for the lcd
#define	LCD_CLEAR_COMMAND   0b1
	command to clear the lcd ram and move cursor to (0,0)
#define	LCD_RETURN_HOME_COMMAND   0b10
	command to set cursor back at (0,0) without clearing data
#define	LCD_JUMP_LINE_COMMAND   0xc0
	command to jump to the beginning of the next line on lcd
#define	LCD_BUSY_BIT   7
	the busy bit in the data returned from reading the lcd program data
#define	LCD_ADDR_COUNTER_MASK   0x7f
	bit mask for address counter in data received from the lcd controller program memory
#define	LCD_MEMUSED_PER_x8_CHAR   8
	how many bytes does one custom char pattern use

Detailed Description

header file holding lcd controller specific information like its timing parameter, commands

Author

Khoi Trinh

Date

2018-09-23

Macro Definition Documentation

#define COM_TIME_SCALER   7000

too low and there might be problem as the lcd controller may not catch up

will be multiplied with timing parameters to prolong the duration, adjust as needed,

#define LCD_ADDR_HOLD_TIME_NANOSEC   15 * COM_TIME_SCALER

indcate target

time to hold the RS, R/W line stable during transaction to properly

#define LCD_ADDR_SETUP_TIME_NANOSEC   35 * COM_TIME_SCALER

target

time to hold the RS, R/W line stable b4 transaction to properly indcate