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Merge pull request #238 from mattetti/ma-lcd-custom-chars

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let devs set and use custom LCD characters
This commit is contained in:
Ron Evans 2015-10-11 08:03:25 -07:00
commit a260141918
2 changed files with 50 additions and 1 deletions
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5
examples/edison_grove_lcd.go
View File

@ -23,7 +23,10 @@ func main() {
screen.Clear()
screen.Home()
screen.SetRGB(0, 255, 0)
screen.Write("goodbye\nhave a nice day")
// set a custom character in the first position
screen.SetCustomChar(0, i2c.CustomLCDChars["smiley"])
// add the custom character at the end of the string
screen.Write("goodbye\nhave a nice day " + string(byte(0)))
gobot.Every(500*time.Millisecond, func() {
screen.Scroll(false)
})

46
platforms/i2c/jhd1313m1_driver.go
View File

@ -1,6 +1,7 @@
package i2c
import (
"fmt"
"time"
"github.com/hybridgroup/gobot"
@ -42,6 +43,31 @@ const (
var _ gobot.Driver = (*JHD1313M1Driver)(nil)
// CustomLCDChars is a map of CGRAM characters that can be loaded
// into a LCD screen to display custom characters. Some LCD screens such
// as the Grove screen (jhd1313m1) isn't loaded with latin 1 characters.
// It's up to the developer to load the set up to 8 custom characters and
// update the input text so the character is swapped by a byte reflecting
// the position of the custom character to use.
// See SetCustomChar
var CustomLCDChars = map[string][8]byte{
"é": [8]byte{130, 132, 142, 145, 159, 144, 142, 128},
"è": [8]byte{136, 132, 142, 145, 159, 144, 142, 128},
"ê": [8]byte{132, 138, 142, 145, 159, 144, 142, 128},
"à": [8]byte{136, 134, 128, 142, 145, 147, 141, 128},
"â": [8]byte{132, 138, 128, 142, 145, 147, 141, 128},
"á": [8]byte{2, 4, 14, 1, 15, 17, 15, 0},
"î": [8]byte{132, 138, 128, 140, 132, 132, 142, 128},
"í": [8]byte{2, 4, 12, 4, 4, 4, 14, 0},
"û": [8]byte{132, 138, 128, 145, 145, 147, 141, 128},
"ù": [8]byte{136, 134, 128, 145, 145, 147, 141, 128},
"ñ": [8]byte{14, 0, 22, 25, 17, 17, 17, 0},
"ó": [8]byte{2, 4, 14, 17, 17, 17, 14, 0},
"heart": [8]byte{0, 10, 31, 31, 31, 14, 4, 0},
"smiley": [8]byte{0, 0, 10, 0, 0, 17, 14, 0},
"frowney": [8]byte{0, 0, 10, 0, 0, 0, 14, 17},
}
// JHD1313M1Driver is a driver for the Jhd1313m1 LCD display which has two i2c addreses,
// one belongs to a controller and the other controls solely the backlight.
// This module was tested with the Seed Grove LCD RGB Backlight v2.0 display which requires 5V to operate.
@ -201,3 +227,23 @@ func (h *JHD1313M1Driver) setReg(command int, data int) error {
func (h *JHD1313M1Driver) command(buf []byte) error {
return h.connection.I2cWrite(h.lcdAddress, append([]byte{LCD_CMD}, buf...))
}
// CustomChar sets one of the 8 CGRAM locations with a custom character.
// The custom character can be used by writing a byte of value 0 to 7.
// When you are using LCD as 5x8 dots in function set then you can define a total of 8 user defined patterns
// (1 Byte for each row and 8 rows for each pattern).
// Use http://www.8051projects.net/lcd-interfacing/lcd-custom-character.php to create your own
// characters.
// To use a custom character, write byte value of the custom character position as a string after
// having setup the custom character.
func (h *JHD1313M1Driver) SetCustomChar(pos int, charMap [8]byte) error {
if pos > 7 {
return fmt.Errorf("can't set a custom character at a position greater than 7")
}
location := uint8(pos)
if err := h.command([]byte{LCD_SETCGRAMADDR | (location << 3)}); err != nil {
return err
}
return h.connection.I2cWrite(h.lcdAddress, append([]byte{LCD_DATA}, charMap[:]...))
}