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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*
* Driver for Sharp LS013B4DN04 transflective LCD, also available as
* "430BOOST-SHARP96" addon for the MSP430 LaunchPad series.
*/
#include "driver/sharp96.h"
#include "driver/spi.h"
#include "driver/gpio.h"
#ifndef SHARP96_POWER_PIN
#error makeflag sharp96_power_pin required
#endif
#ifndef SHARP96_EN_PIN
#error makeflag sharp96_en_pin required
#endif
#ifndef SHARP96_CS_PIN
#error makeflag sharp96_cs_pin required
#endif
#define CMD_WRITE_LINE 0x80
#define CMD_TOGGLE_VCOM 0x40
#define CMD_CLEAR_SCREEN 0x20
void Sharp96::setup()
{
gpio.output(SHARP96_POWER_PIN);
gpio.output(SHARP96_EN_PIN);
gpio.output(SHARP96_CS_PIN);
}
void Sharp96::powerOn()
{
gpio.write(SHARP96_POWER_PIN, 1);
gpio.write(SHARP96_EN_PIN, 1);
}
void Sharp96::powerOff()
{
gpio.write(SHARP96_EN_PIN, 0);
gpio.write(SHARP96_POWER_PIN, 0);
}
unsigned char Sharp96::swap_bits(unsigned char byte)
{
byte = (byte & 0xF0) >> 4 | (byte & 0x0F) << 4;
byte = (byte & 0xCC) >> 2 | (byte & 0x33) << 2;
byte = (byte & 0xAA) >> 1 | (byte & 0x55) << 1;
return byte;
}
void Sharp96::clear()
{
gpio.write(SHARP96_CS_PIN, 1);
txbuf[0] = CMD_CLEAR_SCREEN | (CMD_TOGGLE_VCOM * vcom);
txbuf[1] = 0;
spi.xmit(2, txbuf, 0, txbuf);
gpio.write(SHARP96_CS_PIN, 0);
}
void Sharp96::writeLine(unsigned char line_no, unsigned char* data)
{
txbuf[0] = CMD_WRITE_LINE | (CMD_TOGGLE_VCOM * vcom);
txbuf[1] = swap_bits(line_no + 1);
gpio.write(SHARP96_CS_PIN, 1);
spi.xmit(2, txbuf, 0, txbuf);
spi.xmit(12, data, 0, txbuf);
txbuf[0] = 0;
txbuf[1] = 0;
spi.xmit(2, txbuf, 0, txbuf);
gpio.write(SHARP96_CS_PIN, 0);
}
void Sharp96::toggleVCOM()
{
vcom = !vcom;
txbuf[0] = CMD_TOGGLE_VCOM * vcom;
txbuf[1] = 0;
gpio.write(SHARP96_CS_PIN, 1);
spi.xmit(2, txbuf, 0, txbuf);
gpio.write(SHARP96_CS_PIN, 0);
}
Sharp96 sharp96;
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