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https://github.com/eclipse/upm.git
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142 lines
3.4 KiB
C++
142 lines
3.4 KiB
C++
/*
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* The MIT License (MIT)
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*
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* Author: Daniel Mosquera
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* Copyright (c) 2013 Daniel Mosquera
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*
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* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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* the Software, and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <string>
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#include <unistd.h>
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#include "lcm1602.h"
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using namespace upm;
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Lcm1602::Lcm1602(int bus_in, int addr_in) : I2CLcd (bus_in, addr_in) {
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mraa_result_t error = MRAA_SUCCESS;
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usleep(50000);
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expandWrite(LCD_BACKLIGHT);
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usleep(100000);
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write4bits(0x03 << 4);
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usleep(4500);
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write4bits(0x30);
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usleep(4500);
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write4bits(0x30);
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usleep(150);
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// Put into 4 bit mode
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write4bits(0x20);
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// Set numeber of lines
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send(LCD_FUNCTIONSET | 0x0f, 0);
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send(LCD_DISPLAYCONTROL | LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF, 0);
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clear();
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// Set entry mode.
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send(LCD_ENTRYMODESET | LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT, 0);
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home();
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}
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Lcm1602::~Lcm1602 () {
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}
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/*
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* **************
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* virtual area
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* **************
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*/
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mraa_result_t
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Lcm1602::write (std::string msg) {
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mraa_result_t error = MRAA_SUCCESS;
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for (std::string::size_type i = 0; i < msg.size(); ++i) {
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error = send (msg[i], LCD_RS);
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}
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return error;
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}
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mraa_result_t
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Lcm1602::setCursor (int row, int column) {
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mraa_result_t error = MRAA_SUCCESS;
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int row_addr[] = { 0x80, 0xc0, 0x14, 0x54};
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uint8_t offset = ((column % 16) + row_addr[row]);
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return send (LCD_CMD | offset, 0);
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}
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mraa_result_t
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Lcm1602::clear () {
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return send(LCD_CLEARDISPLAY, 0);
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}
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mraa_result_t
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Lcm1602::home () {
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return send(LCD_RETURNHOME, 0);
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}
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/*
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* **************
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* private area
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* **************
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*/
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mraa_result_t
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Lcm1602::send (uint8_t value, int mode) {
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mraa_result_t ret = MRAA_SUCCESS;
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uint8_t h = value & 0xf0;
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uint8_t l = (value << 4) & 0xf0;
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ret = write4bits(h | mode);
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ret = write4bits(l | mode);
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return ret;
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}
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mraa_result_t
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Lcm1602::write4bits(uint8_t value)
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{
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mraa_result_t ret = MRAA_SUCCESS;
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ret = expandWrite(value);
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ret = pulseEnable(value);
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return ret;
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}
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mraa_result_t
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Lcm1602::expandWrite(uint8_t value)
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{
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uint8_t buffer = value | LCD_BACKLIGHT;
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return mraa_i2c_write_byte(m_i2c_lcd_control, buffer);
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}
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mraa_result_t
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Lcm1602::pulseEnable(uint8_t value)
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{
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mraa_result_t ret = MRAA_SUCCESS;
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ret = expandWrite(value | LCD_EN);
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usleep(1);
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ret = expandWrite(value & ~LCD_EN);
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usleep(50);
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return ret;
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}
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