nuttx/drivers/lcd README
========================

This is the README.txt file for the drivers/lcd/ directory.

Contents
========

- LCD Header files
include/nuttx/lcd/lcd.h
struct lcd_dev_s
- Binding LCD Drivers
- Examples: /drivers/lcd/
- Examples: configs/
- graphics/

LCD Header files
================

include/nuttx/lcd/lcd.h

Structures and APIs needed to work with LCD drivers are provided in
this header file. This header file also depends on some of the same
definitions used for the frame buffer driver as provided in
include/nuttx/video/fb.h.

struct lcd_dev_s

Each LCD device driver must implement an instance of struct lcd_dev_s.
That structure defines a call table with the following methods:

- Get information about the LCD video controller configuration and the
configuration of each LCD color plane.

int (*getvideoinfo)(FAR struct lcd_dev_s *dev,
FAR struct fb_videoinfo_s *vinfo);
int (*getplaneinfo)(FAR struct lcd_dev_s *dev, unsigned int planeno,
FAR struct lcd_planeinfo_s *pinfo);

- The following are provided only if the video hardware supports RGB
color mapping:

int (*getcmap)(FAR struct lcd_dev_s *dev,
FAR struct fb_cmap_s *cmap);
int (*putcmap)(FAR struct lcd_dev_s *dev,
FAR const struct fb_cmap_s *cmap);

- The following are provided only if the video hardware supports a
hardware cursor:

int (*getcursor)(FAR struct lcd_dev_s *dev,
FAR struct fb_cursorattrib_s *attrib);
int (*setcursor)(FAR struct lcd_dev_s *dev,
FAR struct fb_setcursor_s *settings);

- Get the LCD panel power status (0: full off - CONFIG_LCD_MAXPOWER:
full on). On backlit LCDs, this setting may correspond to the
backlight setting.

int (*getpower)(struct lcd_dev_s *dev);

- Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER:
full on). On backlit LCDs, this setting may correspond to the
backlight setting.

int (*setpower)(struct lcd_dev_s *dev, int power);

- Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST) */

int (*getcontrast)(struct lcd_dev_s *dev);

- Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST)

int (*setcontrast)(struct lcd_dev_s *dev, unsigned int contrast);

Binding LCD Drivers
===================

LCD drivers are not normally directly accessed by user code, but are
usually bound to another, higher level device driver. In general, the
binding sequence is:

1. Get an instance of struct lcd_dev_s from the hardware-specific LCD
device driver, and
2. Provide that instance to the initialization method of the higher
level device driver.

Examples: /drivers/lcd/
=======================

Re-usable LCD drivers reside in the drivers/lcd directory:

LCDs:
----
mio283qt2.c. This is a driver for the MI0283QT-2 LCD from Multi-Inno
Technology Co., Ltd. This LCD is based on the Himax HX8347-D LCD
controller.

mio283qt9a.c. This is a driver for the MI0283QT-9A LCD from Multi-Inno
Technology Co., Ltd. This LCD is based on the Ilitek ILI9341 LCD
controller.

ssd12989.c. Generic LCD driver for LCDs based on the Solomon Systech
SSD1289 LCD controller. Think of this as a template for an LCD driver
that you will probably have to customize for any particular LCD
hardware. (see also configs/hymini-stm32v/src/ssd1289.c below).

st7567.c. LCD Display Module, ST7567, Univision Technology Inc. Used
with the LPCXpresso and Embedded Artists base board.

memlcd.c. Sharp Memory LCD Suite, LS013B7DH01, LS013B7DH03, etc.
There are some more different models, they are basically controlled
by similar logics, thus this driver can be extended. Example usage:

ra8875.c. RAiO Technologies RA8875 LCD controller. Contributed by
Marten Svanfeldt.

OLEDs:
-----
p14201.c. Driver for RiT P14201 series display with SD1329 IC
controller. Based on the SD1329 controller. This OLED is used with
older versions of the TI/Luminary LM3S8962 Evaluation Kit. Example
usage

configs/lm3s6965-ek/src
configs/lm3s8962-ek/src

ug-2864ambag01.c. OLED Display Module, UUG-2864AMBAG01, Univision
Technology Inc. Based on the SH1101A controller. Example usage:

configs/stm32f4discovery
configs/zp214xp

ug-9664hswag01.c. OLED Display Module, UG-9664HSWAG01, Univision
Technology Inc. Based on the SSD1305 controller. Used with the
LPC Xpresso and Embedded Artists base board. Example usage:

configs/lpcxpresso-lpc1768

ssd1306.c. OLED Display Modules based on the SSD1306 controllers.
This includes the UG-2864HSWEG01 and UG2832HSWEG04, Both from Univision
Technology Inc. The latter is used with the OLED1 module that comes
with the Atmel SAM4l Xplained Pro board. Example usage:

configs/stm32f4discovery
configs/sam4l-xplained

Segment LCDS (SLCDs):
---------------------

pcf8574_lcd_backpack.c: See pcf8574_lcd_backpack_readme.txt.

Examples: configs/
==================

There are additional LCD drivers in the configs//src directory
that support additional LCDs. LCD drivers in the configuration directory
if they support some differ LCD interface (such as a parallel interface)
that makes then less re-usable:

SSD1289 Drivers:

configs/hymini-stm32v/src/ssd1289.c. See also drivers/lcd/ssd1298.c
above.
configs/stm32f4discovery/src/stm32_ssd1289.c. This examples is the
bottom half for the SSD1289 driver at drivers/lcd/ssd1289.c
configs/hymini-stm32v/src/ssd1289.c. See also drivers/lcd/ssd1298.c
above.
configs/shenzhou/src/stm32_ssd1289.c

kwikstik-k40:

configs/kwikstik-k40/src/k40_lcd.c. Don't waste your time. This is
just a stub.

HX8346:

configs/sam3u-ek/src/sam_lcd.c. The SAM3U-EK development board features
a TFT/Transmissive color LCD module with touch-screen, FTM280C12D,
with integrated driver IC HX8346.

HX8347:

configs/pic32mx7mmb/src/pic32_mio283qt2.c. This driver is for the MI0283QT-2
LCD from Multi-Inno Technology Co., Ltd. This LCD is based on the Himax
HX8347-D LCD controller.

ILI93xx and Similar:

configs/stm3210e-eval/src/stm32_lcd.c. This driver supports the following
LCDs:

1. Ampire AM-240320LTNQW00H
2. Orise Tech SPFD5408B
3. RenesasSP R61580

configs/stm3220g-eval/src/stm32_lcd.c and configs/stm3240g-eval/src/smt32_lcd.c.
AM-240320L8TNQW00H (LCD_ILI9320 or LCD_ILI9321) and
AM-240320D5TOQW01H (LCD_ILI9325)

configs/shenzhou/src/stm32_ili93xx.c. Another ILI93xx driver.
config/sam4e-ek/src/sam_ili9325.c. ILI9325 driver
config/sam4e-ek/src/sam_ili9341.c. ILI9341 driver

ILI9488

configs/samv71-xult/src/sam_ili9488.c
include/nuttx/lcd/ili9488.h

R61505U

configs/hymini-stm32v/src/stm32_r61505u.c

Sharp Memory LCD:

configs/maple/src/stm32_lcd.c

OLEDs:

configs/stm32f4discovery/src/stm32_ug2864ambag01.c
configs/stm32f4discovery/src/stm32_ug2864hsweg01.c
configs/sam4l-xplained/src/sa,_ug2832hsweg04.c
configs/zp214xpa/src/lpc2148_ug2864ambag01.c

LCD controllers built-into the MCU:

arch/arm/src/lpc17xx/lpc17_lcd.c and configs/open1788/src/lpc17_lcd.c.
RGB LCD display panel.
configs/stm32ldiscovery/src/stm32_lcd.c. 1x6 segment LCD with bars
using the segment LCD controller built-into the STM32L15X.

Alphnumeric/segment LCD Displays:

configs/skp16c26/src/m16c_lcd.c. Untested alphanumeric LCD driver.
configs/pcblogic-pic32mx/src/pic32mx_lcd1602.c. LCD1602 is based on the
Hitachi HD44780U LCD controller. This version of the driver
uses the PIC32MX PMP interface to control the LCD. As of this
writing, has *NOT* been verified (mostly because I get bewildered
by all of the jumper wires). See include/nuttx/lcd/hd4478ou.h
for more information about LCD1602.
configs/sure-pic32mx/src/pic32_lcd1602.c. Another LCD1602 segment
LCD. This is a bit-bang version of the driver and appears to
be fully functional. This version of the LCD1602 driver has
been verified and is working fine.
configs/stm32ldiscovery/src/stm32_lcd.c. 1x6 segment LCD with bars
using the segment LCD controller built-into the STM32L15X.

TFT Panel Drivers:

configs/open1788/src/lpc17_lcd.c and arch/arm/src/lpc17xx/lpc17_lcd.c
configs/sama5d3x-ek/src and configs/sama5d4-ek/src: Use
arch/arm/src/sama5/sam_lcd.c

graphics/
=========

See also the usage of the LCD driver in the graphics/ directory.