add LiquidCrystal lua module (#2974)

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seregaxvm 2020-04-18 17:35:14 +03:00 committed by Marcel Stör
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# LiquidCrystal Module
| Since | Origin / Contributor | Maintainer | Source |
| :----- | :-------------------- | :---------- | :------ |
| 2019-12-01 | [Matsievskiy Sergey](https://github.com/seregaxvm) | [Matsievskiy Sergey](https://github.com/seregaxvm) | [liquidcrystal.lua](../../lua_modules/liquidcrystal/liquidcrystal.lua) [i2c4bit.lua](../../lua_modules/liquidcrystal/lc-i2c4bit.lua) [gpio4bit.lua](../../lua_modules/liquidcrystal/lc-gpio4bit.lua) [gpio8bit.lua](../../lua_modules/liquidcrystal/lc-gpio8bit.lua) |
This Lua module provides access to [Hitachi HD44780](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf) based LCDs. It supports 4 bit and 8 bit GPIO interface, 4 bit [PCF8574](https://www.nxp.com/docs/en/data-sheet/PCF8574_PCF8574A.pdf) based I²C interface.
!!! note
This module requires `bit` C module built into firmware. Depending on the interface, `gpio` or `i2c` module is also required.
## Program example
In this example LED screen is connected using I²C GPIO expander.
Program defines five custom characters and prints text.
```lua
backend_meta = require "lc-i2c4bit"
lc_meta = require "liquidcrystal"
-- create display object
lc = lc_meta(backend_meta{sda=1, scl=2}, false, true, 20)
backend_meta = nil
lc_meta = nil
-- define custom characters
lc:customChar(0, {0,14,31,31,4,4,5,2})
lc:customChar(1, {4,6,5,5,4,12,28,8})
lc:customChar(2, {14,31,17,17,17,17,17,31})
lc:customChar(3, {14,31,17,17,17,17,31,31})
lc:customChar(4, {14,31,17,17,31,31,31,31})
lc:customChar(5, {14,31,31,31,31,31,31,31})
lc:clear() -- clear display
lc:blink(true) -- enable cursor blinking
lc:home() -- reset cursor position
lc:write("hello", " ", "world") -- write string
lc:cursorMove(1, 2) -- move cursor to second line
lc:write("umbrella", 0, 32, "note", 1) -- mix text strings and characters
lc:cursorMove(1, 3)
lc:write("Battery level ", 2, 3, 4, 5)
lc:home()
lc:blink(false)
for i=1,20 do print(lc:read()) end -- read back first line
lc:home()
for _, d in ipairs(lc:readCustom(0)) do print(d) end -- read back umbrella char
for _, d in ipairs(lc:readCustom(1)) do print(d) end -- read back note char
```
### Require
```lua
i2c4bit_meta = require("lc-i2c4bit")
gpio4bit_meta = require("lc-gpio4bit")
gpio8bit_meta = require("lc-gpio8bit")
lc_meta = require("liquidcrystal")
```
### Release
```lua
package.loaded["lc-i2c4bit"] = nil
package.loaded["lc-gpio4bit"] = nil
package.loaded["lc-gpio8bit"] = nil
package.loaded["liquidcrystal"] = nil
```
## Initialization
Liquidcrystal module is initialized using closure, which takes backend object as an argument.
### I²C backend
Loading I²C backend module returns initialization closure.
It configures I²C backend and returns backend object.
#### Syntax
`function({[sda=sda_pin] [, scl=scl_pin] [, busid=id] [, busad=address] [, speed = spd] [, rs = rs_pos] [, rw = rw_pos] [, en = en_pos] [, bl = bl_pos] [, d4 = d4_pos] [, d5 = d5_pos] [, d6 = d6_pos] [, d7 = d7_pos]})`
!!! note
In most cases only `sda` and `scl` parameters are required
#### Parameters
- `sda`: I²C data pin. If set to `nil`, I²C bus initialization step via [`i2c.setup`](https://nodemcu.readthedocs.io/en/master/modules/i2c/#i2csetup) will be skipped
- `scl`: I²C clock pin. If set to `nil`, I²C bus initialization step via [`i2c.setup`](https://nodemcu.readthedocs.io/en/master/modules/i2c/#i2csetup) will be skipped
- `busid`: I²C bus ID. Defaults to `0`
- `busad`: chip I²C address. Defaults to `0x27` (default PCF8574 address)
- `speed`: I²C speed. Defaults to `i2c.SLOW`
- `rs`: bit position assigned to `RS` pin in I²C word. Defaults to 0
- `rw`: bit position assigned to `RW` pin in I²C word. Defaults to 1
- `en`: bit position assigned to `EN` pin in I²C word. Defaults to 2
- `bl`: bit position assigned to backlight pin in I²C word. Defaults to 3
- `d4`: bit position assigned to `D4` pin in I²C word. Defaults to 4
- `d5`: bit position assigned to `D5` pin in I²C word. Defaults to 5
- `d6`: bit position assigned to `D6` pin in I²C word. Defaults to 6
- `d7`: bit position assigned to `D7` pin in I²C word. Defaults to 7
#### Returns
- backend object
#### Example
```lua
backend_meta = require "lc-i2c4bit"
backend = backend_meta{sda=1, scl=2 ,speed=i2c.FAST}
```
### GPIO 4 bit backend
Loading GPIO 4 bit backend module returns initialization closure.
It configures GPIO 4 bit backend and returns backend object.
#### Syntax
`function({[, rs = rs_pos] [, rw = rw_pos] [, en = en_pos] [, bl = bl_pos] [, d4 = d4_pos] [, d5 = d5_pos] [, d6 = d6_pos] [, d7 = d7_pos]})`
#### Parameters
- `rs`: GPIO pin connected to `RS` pin. Defaults to 0
- `rw`: GPIO pin connected to `RW` pin. If set to `nil` then `busy`, `position` and `readChar` functions will not be available. Note that `RW` pin must be pulled to the ground if not connected to GPIO
- `en`: GPIO pin connected to `EN` pin. Defaults to 1
- `bl`: GPIO pin controlling backlight. It is assumed, that high level turns backlight on, low level turns backlight off. If set to `nil` then backlight function will not be available
- `d4`: GPIO pin connected to `D4` pin. Defaults to 2
- `d5`: GPIO pin connected to `D5` pin. Defaults to 3
- `d6`: GPIO pin connected to `D6` pin. Defaults to 4
- `d7`: GPIO pin connected to `D7` pin. Defaults to 5
#### Returns
- backend object
#### Example
```lua
backend_meta = require "lc-gpio4bit"
backend = backend_meta{rs=0, rw=1, en=4, d4=5, d5=6, d6=7, d7=8}
```
### GPIO 8 bit backend
Loading GPIO 8 bit backend module returns initialization closure.
It configures GPIO 8 bit backend and returns backend object.
#### Syntax
`function({[, rs = rs_pos] [, rw = rw_pos] [, en = en_pos] [, bl = bl_pos] [, d0 = d0_pos] [, d1 = d1_pos] [, d2 = d2_pos] [, d3 = d3_pos] [, d4 = d4_pos] [, d5 = d5_pos] [, d6 = d6_pos] [, d7 = d7_pos]})`
#### Parameters
- `rs`: GPIO pin connected to `RS` pin. Defaults to 0
- `rw`: GPIO pin connected to `RW` pin. If set to `nil` then `busy`, `position` and `readChar` functions will not be available. Note that `RW` pin must be pulled to the ground if not connected to GPIO
- `en`: GPIO pin connected to `EN` pin. Defaults to 1
- `bl`: GPIO pin controlling backlight. It is assumed, that high level turns backlight on, low level turns backlight off. If set to `nil` then backlight function will not be available
- `d0`: GPIO pin connected to `D0` pin. Defaults to 2
- `d1`: GPIO pin connected to `D1` pin. Defaults to 3
- `d2`: GPIO pin connected to `D2` pin. Defaults to 4
- `d3`: GPIO pin connected to `D3` pin. Defaults to 5
- `d4`: GPIO pin connected to `D4` pin. Defaults to 6
- `d5`: GPIO pin connected to `D5` pin. Defaults to 7
- `d6`: GPIO pin connected to `D6` pin. Defaults to 8
- `d7`: GPIO pin connected to `D7` pin. Defaults to 9
#### Returns
- backend object
#### Example
```lua
backend_meta = require "lc-gpio8bit"
backend = backend_meta{rs=15, rw=2, en=5, d0=23, d1=13, d2=33, d3=32, d4=18, d5=19, d6=21, d7=22}
```
### Liquidcrystal initialization
Loading Liquidcrystal module returns initialization closure.
It requires backend object and returns LCD object.
#### Syntax
`function(backend, onelinemode, eightdotsmode, column_width)`
#### Parameters
- `backend`: backend object
- `onelinemode`: `true` to use one line mode, `false` to use two line mode
- `eightdotsmode`: `true` to use 5x8 dot font, `false` to use 5x10 dot font
- `column_width`: number of characters in column. Used for offset calculations in function `cursorMove`. If set to `nil`, functionality of `cursorMove` will be limited. For most displays column width is `20` characters
#### Returns
screen object
#### Example
```lua
lc_meta = require "liquidcrystal"
lc = lc_meta(backend, true, true, 20)
```
## liquidcrystal.autoscroll
Autoscroll text when printing. When turned off, cursor moves and text stays still, when turned on, vice versa.
#### Syntax
`liquidcrystal.autoscroll(self, on)`
#### Parameters
- `self`: `liquidcrystal` instance
- `on`: `true` to turn on, `false` to turn off
#### Returns
- sent data
#### Example
```lua
liquidcrystal:autoscroll(true)
```
## liquidcrystal.backlight
Control LCDs backlight. When using GPIO backend without `bl` argument specification function does nothing.
#### Syntax
`liquidcrystal.backlight(self, on)`
#### Parameters
- `self`: `liquidcrystal` instance
- `on`: `true` to turn on, `false` to turn off
#### Returns
- backlight status
#### Example
```lua
liquidcrystal:backlight(true)
```
## liquidcrystal.blink
Control cursors blink mode.
#### Syntax
`liquidcrystal.blink(self, on)`
#### Parameters
- `self`: `liquidcrystal` instance
- `on`: `true` to turn on, `false` to turn off
#### Returns
- sent data
#### Example
```lua
liquidcrystal:blink(true)
```
## liquidcrystal.busy
Get busy status of the LCD. When using GPIO backend without `rw` argument specification function does nothing.
#### Syntax
`liquidcrystal.busy(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- `true` if device is busy, `false` if device is ready to receive commands
#### Example
```lua
while liquidcrystal:busy() do end
```
## liquidcrystal.clear
Clear LCD screen.
#### Syntax
`liquidcrystal.clear(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:clear()
```
## liquidcrystal.cursorLeft
Move cursor one character to the left.
#### Syntax
`liquidcrystal.cursorLeft(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:cursorLeft()
```
## liquidcrystal.cursorMove
Move cursor to position. If `row` not specified, move cursor to address `col`.
!!! note
Note that column and row indexes start with 1. However, when omitting `row` parameter, cursor addresses start with 0.
#### Syntax
`liquidcrystal.cursorMove(self, col, row)`
#### Parameters
- `self`: `liquidcrystal` instance
- `col`: new cursor position column. If `row` not specified, new cursor position address
- `row`: new cursor position row or `nil`
#### Returns
- sent data
#### Example
```lua
liquidcrystal:cursorMove(5, 1)
liquidcrystal:cursorMove(10, 4)
liquidcrystal:cursorMove(21)
```
## liquidcrystal.cursor
Control cursors highlight mode.
#### Syntax
`liquidcrystal.cursor(self, on)`
#### Parameters
- `self`: `liquidcrystal` instance
- `on`: `true` to turn on, `false` to turn off
#### Returns
- sent data
#### Example
```lua
liquidcrystal:cursor(true)
```
## liquidcrystal.cursorRight
Move cursor one character to the right.
#### Syntax
`liquidcrystal.cursorRight(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:cursorRight()
```
## liquidcrystal.customChar
Define new custom char. Up to 8 custom characters with indexes 0 to 7 may be defined in eight dot mode.
They are accessed via `write` function by index.
In ten dot mode only 4 custom characters may be used.
They are numbered from 0 to 7 with half of them being aliases to each other (0 to 1, 2 to 3 etc).
!!! note
Upon redefinition of a custom character all its instances will be updated automatically.
This function resets cursor position to home if `liquidcrystal.position` function is not available.
There are web services ([1](https://omerk.github.io/lcdchargen/), [2](https://www.quinapalus.com/hd44780udg.html)) and [desktop applications](https://pypi.org/project/lcdchargen/) that help create custom characters.
#### Syntax
`liquidcrystal.customChar(self, index, bytes)`
#### Parameters
- `self`: `liquidcrystal` instance
- `index`: custom char index in range from 0 to 7
- `bytes`: array of 8 bytes in eight bit mode or 11 bytes in ten bit mode (eleventh line is a cursor line that can also be used) that defines new char bitmap line by line
#### Returns
`nil`
#### Example
```lua
liquidcrystal:customChar(5, {14,31,31,31,31,31,31,31})
liquidcrystal:write(5)
```
## liquidcrystal.display
Turn display on and off. Does not affect display backlight. Does not clear the display.
#### Syntax
`liquidcrystal.display(self, on)`
#### Parameters
- `self`: `liquidcrystal` instance
- `on`: `true` to turn on, `false` to turn off
#### Returns
- sent data
#### Example
```lua
liquidcrystal:display(true)
```
## liquidcrystal.home
Reset cursor and screen position.
#### Syntax
`liquidcrystal.home(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:home()
```
## liquidcrystal.leftToRight
Print text left to right (default).
#### Syntax
`liquidcrystal.leftToRight(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:leftToRight()
```
## liquidcrystal.position
Get current position of the cursor. Position is 0 indexed. When using GPIO backend without `rw` argument specification function does nothing.
#### Syntax
`liquidcrystal.position(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- 0 indexed position of the cursor
#### Example
```lua
local pos = liquidcrystal:position() -- save position
-- some code
liquidcrystal:cursorMove(pos) -- restore position
```
## liquidcrystal.read
Return current character numerical representation.
When using GPIO backend without `rw` argument specification function does nothing.
#### Syntax
`liquidcrystal.read(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- numerical representation of the current character
#### Example
```lua
liquidcrystal:home() -- goto home
local ch = liquidcrystal:read() -- read char
liquidcrystal:cursorMove(1, 2) -- move to the second line
for i=ch,ch+5 do lc:write(i) end -- print 6 chars starting with ch
```
## liquidcrystal.readCustom
Return custom char byte array.
When using GPIO backend without `rw` argument specification function returns zeros.
#### Syntax
`liquidcrystal.readCustom(self, index)`
#### Parameters
- `self`: `liquidcrystal` instance
- `index`: custom char index in range from 0 to 7
#### Returns
- table of size 8 in eight dot mode or 11 in ten dot mode. Each 8 bit number represents a character dot line
#### Example
```lua
lc:customChar(0, {0,14,31,31,4,4,5,2}) -- define custom character
for _, d in ipairs(lc:readCustom(0)) do print(d) end -- read it back
```
## liquidcrystal.rightToLeft
Print text right to left.
#### Syntax
`liquidcrystal.rightToLeft(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:rightToLeft()
```
## liquidcrystal.scrollLeft
Move text to the left.
#### Syntax
`liquidcrystal.scrollLeft(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:scrollLeft()
```
## liquidcrystal.scrollRight
Move text to the right.
#### Syntax
`liquidcrystal.scrollRight(self)`
#### Parameters
- `self`: `liquidcrystal` instance
#### Returns
- sent data
#### Example
```lua
liquidcrystal:scrollRight()
```
## liquidcrystal.write
Print text.
#### Syntax
`liquidcrystal.write(self, ...)`
#### Parameters
- `self`: `liquidcrystal` instance
- `...`: strings or char codes. For the list of available characters refer to [HD44780 datasheet](https://www.sparkfun.com/datasheets/LCD/HD44780.pdf#page=17)
#### Returns
`nil`
#### Example
```lua
liquidcrystal:write("hello world")
liquidcrystal:write("hello yourself", "!!!", 243, 244)
```

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local gpio, bit = gpio, bit
return function(bus_args)
local rs = bus_args.rs or 0
local rw = bus_args.rw
local en = bus_args.en or 1
local bl = bus_args.backlight
local d4 = bus_args.d4 or 2
local d5 = bus_args.d5 or 3
local d6 = bus_args.d6 or 4
local d7 = bus_args.d7 or 5
for _, d in pairs({rs,rw,en,bl}) do
if d then
gpio.mode(d, gpio.OUTPUT)
end
end
local function setGPIO(mode)
for _, d in pairs({d4, d5, d6, d7}) do
gpio.mode(d, mode)
end
end
setGPIO(gpio.OUTPUT)
local function send4bitGPIO(value, rs_en, rw_en, read)
local function exchange(data)
local rv = 0
if rs then gpio.write(rs, rs_en and gpio.HIGH or gpio.LOW) end
if rw then gpio.write(rw, rw_en and gpio.HIGH or gpio.LOW) end
gpio.write(en, gpio.HIGH)
for i, d in ipairs({d4, d5, d6, d7}) do
if read and rw then
if gpio.read(d) == 1 then rv = bit.set(rv, i-1) end
else
gpio.write(d, bit.isset(data, i-1) and gpio.HIGH or gpio.LOW)
end
end
gpio.write(en, gpio.LOW)
return rv
end
local hi = bit.rshift(bit.band(value, 0xf0), 4)
local lo = bit.band(value, 0xf)
if read then setGPIO(gpio.INPUT) end
hi = exchange(hi)
lo = exchange(lo)
if read then setGPIO(gpio.OUTPUT) end
return bit.bor(bit.lshift(hi, 4), lo)
end
-- init sequence from datasheet
send4bitGPIO(0x33, false, false, false)
send4bitGPIO(0x32, false, false, false)
-- Return backend object
return {
fourbits = true,
command = function (screen, cmd)
return send4bitGPIO(cmd, false, false, false)
end,
busy = function(screen)
if rw == nil then return false end
return bit.isset(send4bitGPIO(0xff, false, true, true), 7)
end,
position = function(screen)
if rw == nil then return 0 end
return bit.clear(send4bitGPIO(0xff, false, true, true), 7)
end,
write = function(screen, value)
return send4bitGPIO(value, true, false, false)
end,
read = function(screen)
if rw == nil then return nil end
return send4bitGPIO(0xff, true, true, true)
end,
backlight = function(screen, on)
if (bl) then gpio.write(bl, on and gpio.HIGH or gpio.LOW) end
return on
end,
}
end

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local gpio, bit = gpio, bit
return function(bus_args)
local rs = bus_args.rs or 0
local rw = bus_args.rw
local en = bus_args.en or 1
local bl = bus_args.backlight
local d0 = bus_args.d0 or 2
local d1 = bus_args.d1 or 3
local d2 = bus_args.d2 or 4
local d3 = bus_args.d3 or 5
local d4 = bus_args.d4 or 6
local d5 = bus_args.d5 or 7
local d6 = bus_args.d6 or 8
local d7 = bus_args.d7 or 9
for _, d in pairs({rs,rw,en,bl}) do
if d then
gpio.mode(d, gpio.OUTPUT)
end
end
local function setGPIO(mode)
for _, d in pairs({d0, d1, d2, d3, d4, d5, d6, d7}) do
gpio.mode(d, mode)
end
end
setGPIO(gpio.OUTPUT)
local function send8bitGPIO(value, rs_en, rw_en, read)
local function exchange(data)
local rv = 0
if rs then gpio.write(rs, rs_en and gpio.HIGH or gpio.LOW) end
if rw then gpio.write(rw, rw_en and gpio.HIGH or gpio.LOW) end
gpio.write(en, gpio.HIGH)
for i, d in ipairs({d0, d1, d2, d3, d4, d5, d6, d7}) do
if read and rw then
if gpio.read(d) == 1 then rv = bit.set(rv, i-1) end
else
gpio.write(d, bit.isset(data, i-1) and gpio.HIGH or gpio.LOW)
end
end
gpio.write(en, gpio.LOW)
return rv
end
if read then setGPIO(gpio.INPUT) end
value = exchange(value)
if read then setGPIO(gpio.OUTPUT) end
return value
end
-- Return backend object
return {
fourbits = false,
command = function (screen, cmd)
return send8bitGPIO(cmd, false, false, false)
end,
busy = function(screen)
if rw == nil then return false end
return bit.isset(send8bitGPIO(0xff, false, true, true), 7)
end,
position = function(screen)
if rw == nil then return 0 end
return bit.clear(send8bitGPIO(0xff, false, true, true), 7)
end,
write = function(screen, value)
return send8bitGPIO(value, true, false, false)
end,
read = function(screen)
if rw == nil then return nil end
return send8bitGPIO(0xff, true, true, true)
end,
backlight = function(screen, on)
if (bl) then gpio.write(bl, on and gpio.HIGH or gpio.LOW) end
return on
end,
}
end

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local i2c, bit = i2c, bit
return function(bus_args)
local busid = bus_args.id or 0
local busad = bus_args.address or 0x27
local speed = bus_args.speed or i2c.SLOW
local rs = bus_args.rs or 0
local rw = bus_args.rw or 1
local en = bus_args.en or 2
local bl = bus_args.backlight or 3
local d4 = bus_args.d4 or 4
local d5 = bus_args.d5 or 5
local d6 = bus_args.d6 or 6
local d7 = bus_args.d7 or 7
-- Convenience I2C setup if a pin configuration is given
if bus_args.sda ~= nil and bus_args.scl ~= nil then
i2c.setup(busid, bus_args.sda, bus_args.scl, speed)
end
-- The onus is on us to maintain the backlight state
local backlight = true
local function send4bitI2C(value, rs_en, rw_en, read)
local function exchange(data, unset_read)
local rv = data
i2c.start(busid)
i2c.address(busid, busad, i2c.TRANSMITTER)
i2c.write(busid, bit.set(data, en))
if read then
i2c.start(busid)
i2c.address(busid, busad, i2c.RECEIVER)
rv = i2c.read(busid, 1):byte(1)
i2c.start(busid)
i2c.address(busid, busad, i2c.TRANSMITTER)
if unset_read then data = bit.bor(bit.bit(rs),
bit.bit(rw),
backlight and bit.bit(bl) or 0) end
i2c.write(busid, bit.set(data, en))
end
i2c.write(busid, bit.clear(data, en))
i2c.stop(busid)
return rv
end
local lo = bit.bor(bit.isset(value, 0) and bit.bit(d4) or 0,
bit.isset(value, 1) and bit.bit(d5) or 0,
bit.isset(value, 2) and bit.bit(d6) or 0,
bit.isset(value, 3) and bit.bit(d7) or 0)
local hi = bit.bor(bit.isset(value, 4) and bit.bit(d4) or 0,
bit.isset(value, 5) and bit.bit(d5) or 0,
bit.isset(value, 6) and bit.bit(d6) or 0,
bit.isset(value, 7) and bit.bit(d7) or 0)
local cmd = bit.bor(rs_en and bit.bit(rs) or 0,
rw_en and bit.bit(rw) or 0,
backlight and bit.bit(bl) or 0)
hi = exchange(bit.bor(cmd, hi), false)
lo = exchange(bit.bor(cmd, lo), true)
return bit.bor(bit.lshift(bit.isset(lo, d4) and 1 or 0, 0),
bit.lshift(bit.isset(lo, d5) and 1 or 0, 1),
bit.lshift(bit.isset(lo, d6) and 1 or 0, 2),
bit.lshift(bit.isset(lo, d7) and 1 or 0, 3),
bit.lshift(bit.isset(hi, d4) and 1 or 0, 4),
bit.lshift(bit.isset(hi, d5) and 1 or 0, 5),
bit.lshift(bit.isset(hi, d6) and 1 or 0, 6),
bit.lshift(bit.isset(hi, d7) and 1 or 0, 7))
end
-- init sequence from datasheet
send4bitI2C(0x33, false, false, false)
send4bitI2C(0x32, false, false, false)
-- Return backend object
return {
fourbits = true,
command = function (screen, cmd)
return send4bitI2C(cmd, false, false, false)
end,
busy = function(screen)
local rv = send4bitI2C(0xff, false, true, true)
send4bitI2C(bit.bor(0x80, bit.clear(rv, 7)), false, false, false)
return bit.isset(rv, 7)
end,
position = function(screen)
local rv = bit.clear(send4bitI2C(0xff, false, true, true), 7)
send4bitI2C(bit.bor(0x80, rv), false, false, false)
return rv
end,
write = function(screen, value)
return send4bitI2C(value, true, false, false)
end,
read = function(screen)
return send4bitI2C(0xff, true, true, true)
end,
backlight = function(screen, on)
backlight = on
local rv = bit.clear(send4bitI2C(0xff, false, true, true), 7)
send4bitI2C(bit.bor(0x80, rv), false, false, false)
return on
end,
}
end

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@ -0,0 +1,183 @@
local bit = bit
-- metatable
local LiquidCrystal = {}
LiquidCrystal.__index = LiquidCrystal
-- commands
local LCD_CLEARDISPLAY = 0x01
local LCD_RETURNHOME = 0x02
local LCD_ENTRYMODESET = 0x04
local LCD_DISPLAYCONTROL = 0x08
local LCD_CURSORSHIFT = 0x10
local LCD_FUNCTIONSET = 0x20
local LCD_SETCGRAMADDR = 0x40
local LCD_SETDDRAMADDR = 0x80
-- flags for display entry mode
-- local LCD_ENTRYRIGHT = 0x00
local LCD_ENTRYLEFT = 0x02
local LCD_ENTRYSHIFTINCREMENT = 0x01
-- local LCD_ENTRYSHIFTDECREMENT = 0x00
-- flags for display on/off control
local LCD_DISPLAYON = 0x04
-- local LCD_DISPLAYOFF = 0x00
local LCD_CURSORON = 0x02
-- local LCD_CURSOROFF = 0x00
local LCD_BLINKON = 0x01
-- local LCD_BLINKOFF = 0x00
-- flags for display/cursor shift
local LCD_DISPLAYMOVE = 0x08
local LCD_CURSORMOVE = 0x00
local LCD_MOVERIGHT = 0x04
local LCD_MOVELEFT = 0x00
-- flags for function set
local LCD_8BITMODE = 0x10
local LCD_4BITMODE = 0x00
local LCD_2LINE = 0x08
local LCD_1LINE = 0x00
local LCD_5x10DOTS = 0x04
local LCD_5x8DOTS = 0x00
function LiquidCrystal:autoscroll(on)
if on then
self._displaymode = bit.bor(self._displaymode, LCD_ENTRYSHIFTINCREMENT)
else
self._displaymode = bit.band(self._displaymode, bit.bnot(LCD_ENTRYSHIFTINCREMENT))
end
return self:_command(bit.bor(LCD_ENTRYMODESET, self._displaymode))
end
function LiquidCrystal:blink(on)
if on then
self._displaycontrol = bit.bor(self._displaycontrol, LCD_BLINKON)
else
self._displaycontrol = bit.band(self._displaycontrol, bit.bnot(LCD_BLINKON))
end
return self:_command(bit.bor(LCD_DISPLAYCONTROL, self._displaycontrol))
end
function LiquidCrystal:clear() return self:_command(LCD_CLEARDISPLAY) end
function LiquidCrystal:cursorLeft()
return self:_command(bit.bor(LCD_CURSORSHIFT, LCD_CURSORMOVE, LCD_MOVELEFT))
end
function LiquidCrystal:cursorMove(col, row)
return self:_command(bit.bor(LCD_SETDDRAMADDR, col + (row and (self._offsets[row] - 1) or 0)))
end
function LiquidCrystal:cursor(on)
if on then
self._displaycontrol = bit.bor(self._displaycontrol, LCD_CURSORON)
else
self._displaycontrol = bit.band(self._displaycontrol, bit.bnot(LCD_CURSORON))
end
return self:_command(bit.bor(LCD_DISPLAYCONTROL, self._displaycontrol))
end
function LiquidCrystal:cursorRight()
return self:_command(bit.bor(LCD_CURSORSHIFT, LCD_CURSORMOVE, LCD_MOVERIGHT))
end
function LiquidCrystal:customChar(index, bytes)
local pos = self:position()
self:_command(bit.bor(LCD_SETCGRAMADDR,
bit.lshift(bit.band(self._eightdots and index or bit.clear(index, 0),
0x7), 3)))
for i=1,(self._eightdots and 8 or 11) do self:_write(bytes[i] or 0) end
self:cursorMove(pos)
end
function LiquidCrystal:display(on)
if on then
self._displaycontrol = bit.bor(self._displaycontrol, LCD_DISPLAYON)
else
self._displaycontrol = bit.band(self._displaycontrol, bit.bnot(LCD_DISPLAYON))
end
return self:_command(bit.bor(LCD_DISPLAYCONTROL, self._displaycontrol))
end
function LiquidCrystal:home() return self:_command(LCD_RETURNHOME) end
function LiquidCrystal:leftToRight()
self._displaymode = bit.bor(self._displaymode, LCD_ENTRYLEFT)
return self:_command(bit.bor(LCD_ENTRYMODESET, self._displaymode))
end
function LiquidCrystal:readCustom(index)
local pos = self:position()
local data = {}
self:_command(bit.bor(LCD_SETCGRAMADDR,
bit.lshift(bit.band(self._eightdots and index or bit.clear(index, 0),
0x7), 3)))
for i=1,(self._eightdots and 8 or 11) do data[i] = self:read() end
self:cursorMove(pos)
return data
end
function LiquidCrystal:rightToLeft()
self._displaymode = bit.band(self._displaymode, bit.bnot(LCD_ENTRYLEFT))
self:_command(bit.bor(LCD_ENTRYMODESET, self._displaymode))
end
function LiquidCrystal:scrollLeft()
return self:_command(bit.bor(LCD_CURSORSHIFT, LCD_DISPLAYMOVE, LCD_MOVELEFT))
end
function LiquidCrystal:scrollRight()
return self:_command(bit.bor(LCD_CURSORSHIFT, LCD_DISPLAYMOVE, LCD_MOVERIGHT))
end
function LiquidCrystal:write(...)
for _, x in ipairs({...}) do
if type(x) == "number" then
self:_write(x)
end
if type(x) == "string" then
for i=1,#x do
self:_write(string.byte(x, i))
end
end
end
end
return function (backend, onelinemode, eightdotsmode, column_width)
local self = {}
setmetatable(self, LiquidCrystal)
-- copy out backend functions, to avoid a long-lived table
self._command = backend.command
self.busy = backend.busy
self.position = backend.position
self._write = backend.write
self.read = backend.read
self.backlight = backend.backlight
-- defaults
self._displaycontrol = 0
self._displaymode = 0
self._eightdots = eightdotsmode
self._offsets = {0, 0x40}
if column_width ~= nil then
self._offsets[3] = 0 + column_width
self._offsets[4] = 0x40 + column_width
end
self:_command(bit.bor(LCD_FUNCTIONSET,
bit.bor(
backend.fourbits and LCD_4BITMODE or LCD_8BITMODE,
onelinemode and LCD_1LINE or LCD_2LINE,
eightdotsmode and LCD_5x8DOTS or LCD_5x10DOTS)))
self:_command(bit.bor(LCD_ENTRYMODESET, self._displaymode))
self:display(true)
self:clear()
return self
end

View File

@ -54,6 +54,7 @@ pages:
- 'hdc1000': 'lua-modules/hdc1000.md' - 'hdc1000': 'lua-modules/hdc1000.md'
- 'httpserver': 'lua-modules/httpserver.md' - 'httpserver': 'lua-modules/httpserver.md'
- 'imap': 'lua-modules/imap.md' - 'imap': 'lua-modules/imap.md'
- 'liquidcrystal': 'lua-modules/liquidcrystal.md'
- 'lm92': 'lua-modules/lm92.md' - 'lm92': 'lua-modules/lm92.md'
- 'mcp23008': 'lua-modules/mcp23008.md' - 'mcp23008': 'lua-modules/mcp23008.md'
- 'redis': 'lua-modules/redis.md' - 'redis': 'lua-modules/redis.md'