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jhd1313m1_driver.go
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jhd1313m1_driver.go
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package i2c
import (
"time"
"github.com/hybridgroup/gobot"
)
const (
REG_RED = 0x04
REG_GREEN = 0x03
REG_BLUE = 0x02
LCD_CLEARDISPLAY = 0x01
LCD_RETURNHOME = 0x02
LCD_ENTRYMODESET = 0x04
LCD_DISPLAYCONTROL = 0x08
LCD_CURSORSHIFT = 0x10
LCD_FUNCTIONSET = 0x20
LCD_SETCGRAMADDR = 0x40
LCD_SETDDRAMADDR = 0x80
LCD_ENTRYRIGHT = 0x00
LCD_ENTRYLEFT = 0x02
LCD_ENTRYSHIFTINCREMENT = 0x01
LCD_ENTRYSHIFTDECREMENT = 0x00
LCD_DISPLAYON = 0x04
LCD_DISPLAYOFF = 0x00
LCD_CURSORON = 0x02
LCD_CURSOROFF = 0x00
LCD_BLINKON = 0x01
LCD_BLINKOFF = 0x00
LCD_DISPLAYMOVE = 0x08
LCD_CURSORMOVE = 0x00
LCD_MOVERIGHT = 0x04
LCD_MOVELEFT = 0x00
LCD_2LINE = 0x08
LCD_2NDLINEOFFSET = 0x40
)
var _ gobot.Driver = (*JHD1313M1Driver)(nil)
type JHD1313M1Driver struct {
name string
connection I2c
lcdAddress int
rgbAddress int
}
// NewJHD1313M1Driver creates a new driver with specified name and i2c interface
func NewJHD1313M1Driver(a I2c, name string) *JHD1313M1Driver {
return &JHD1313M1Driver{
name: name,
connection: a,
lcdAddress: 0x3E,
rgbAddress: 0x62,
}
}
func (h *JHD1313M1Driver) Name() string { return h.name }
func (h *JHD1313M1Driver) Connection() gobot.Connection { return h.connection.(gobot.Connection) }
func (h *JHD1313M1Driver) Start() (errs []error) {
cmd := uint8(0)
if err := h.connection.I2cStart(h.lcdAddress); err != nil {
return []error{err}
}
if err := h.connection.I2cStart(h.rgbAddress); err != nil {
return []error{err}
}
cmd |= LCD_2LINE
<-time.After(30 * time.Millisecond)
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_FUNCTIONSET | cmd}); err != nil {
return []error{err}
}
<-time.After(40 * time.Nanosecond)
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_FUNCTIONSET | cmd}); err != nil {
return []error{err}
}
<-time.After(150 * time.Microsecond)
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_FUNCTIONSET | cmd}); err != nil {
return []error{err}
}
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_FUNCTIONSET | cmd}); err != nil {
return []error{err}
}
cmd |= LCD_DISPLAYON
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_DISPLAYCONTROL | cmd}); err != nil {
return []error{err}
}
h.Clear()
cmd |= LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT
if err := h.connection.I2cWrite(h.lcdAddress, []byte{0x80, LCD_ENTRYMODESET | cmd}); err != nil {
return []error{err}
}
if err := h.setReg(0, 1); err != nil {
return []error{err}
}
if err := h.setReg(1, 0); err != nil {
return []error{err}
}
if err := h.setReg(0x08, 0xAA); err != nil {
return []error{err}
}
if err := h.SetRGB(255, 255, 255); err != nil {
return []error{err}
}
return
}
func (h *JHD1313M1Driver) SetRGB(r, g, b int) (err error) {
if err = h.setReg(REG_RED, r); err != nil {
return
}
if err = h.setReg(REG_GREEN, g); err != nil {
return
}
return h.setReg(REG_BLUE, b)
}
func (h *JHD1313M1Driver) setReg(command int, data int) (err error) {
if err = h.connection.I2cWrite(h.rgbAddress, []byte{byte(command), byte(data)}); err != nil {
return
}
return
}
func (h *JHD1313M1Driver) Clear() (err error) {
return h.command([]byte{LCD_CLEARDISPLAY})
}
func (h *JHD1313M1Driver) Home() (err error) {
return h.command([]byte{LCD_RETURNHOME})
}
func (h *JHD1313M1Driver) Write(message string) (err error) {
for _, val := range message {
if val == '\n' {
if err = h.SetPosition(16); err != nil {
return
}
continue
}
if err = h.connection.I2cWrite(h.lcdAddress, []byte{0x40, byte(val)}); err != nil {
break
}
}
return
}
// SetPosition sets the cursor and the data display to pos.
// 0..15 are the positions in the first display line.
// 16..32 are the positions in the second display line.
func (h *JHD1313M1Driver) SetPosition(pos int) (err error) {
if pos < 0 || pos > 31 {
err = ErrInvalidPosition
return
}
offset := byte(pos)
if pos >= 16 {
offset -= 16
offset |= LCD_2NDLINEOFFSET
}
err = h.command([]byte{LCD_SETDDRAMADDR | offset})
return
}
func (h *JHD1313M1Driver) Halt() (errs []error) { return }
func (h *JHD1313M1Driver) command(buf []byte) (err error) {
return h.connection.I2cWrite(h.lcdAddress, append([]byte{0x80}, buf...))
}