func (l *LCD) pulseEnable() {
rpi.DigitalWrite(l.enable, LOW)
rpi.DelayMicroseconds(1)
rpi.DigitalWrite(l.enable, HIGH)
rpi.DelayMicroseconds(1)
rpi.DigitalWrite(l.enable, LOW)
rpi.DelayMicroseconds(100)
}
func (l *LCD) write4bits(v uint8) {
for i := uint8(0); i < 4; i++ {
b := (v>>i)&0x01 == 0x01
rpi.PinMode(l.data[i], rpi.OUTPUT)
rpi.DigitalWrite(l.data[i], b)
}
l.pulseEnable()
}
func (l *LCD) Begin(cols, lines int) {
if lines > 1 {
l.displayfunction |= LCD_2LINE
}
rpi.DelayMicroseconds(50000)
// Now we pull both RS and R/W low to begin commands
rpi.DigitalWrite(l.rs, LOW)
rpi.DigitalWrite(l.enable, LOW)
// we start in 8bit mode, try to set 4 bit mode
l.write4bits(0x03)
rpi.DelayMicroseconds(4500) // wait min 4.1ms
// we start in 8bit mode, try to set 4 bit mode
l.write4bits(0x03)
rpi.DelayMicroseconds(4500) // wait min 4.1ms
// we start in 8bit mode, try to set 4 bit mode
l.write4bits(0x03)
rpi.DelayMicroseconds(150)
// finally, set to 8-bit interface
l.write4bits(0x02)
// finally, set # lines, font size, etc.
l.command(LCD_FUNCTIONSET | l.displayfunction)
// turn the display on with no cursor or blinking default
l.displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF
l.Display()
// clear it off
l.Clear()
// Initialize to default text direction (for romance languages)
l.displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT
// set the entry mode
l.command(LCD_ENTRYMODESET | l.displaymode)
}
func (l *LCD) send(v uint8, mode bool) {
rpi.DigitalWrite(l.rs, mode)
l.write4bits(v >> 4)
l.write4bits(v)
}