upm/src/lcd/ssd1308.cxx

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/*
* Author: Yevgeniy Kiveisha <yevgeniy.kiveisha@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <string>
#include <unistd.h>
#include "ssd1308.h"
using namespace upm;
SSD1308::SSD1308(int bus_in, int addr_in) : I2CLcd(bus_in, addr_in)
{
mraa_i2c_write_byte_data(m_i2c_lcd_control, DISPLAY_CMD_OFF, LCD_CMD); // display off
usleep(4500);
mraa_i2c_write_byte_data(m_i2c_lcd_control, DISPLAY_CMD_ON, LCD_CMD); // display on
usleep(4500);
setNormalDisplay(); // set to normal display '1' is ON
clear();
setAddressingMode(PAGE);
}
SSD1308::~SSD1308()
{
}
mraa_result_t
SSD1308::draw(uint8_t* data, int bytes)
{
mraa_result_t error = MRAA_SUCCESS;
setAddressingMode(HORIZONTAL);
for (int idx = 0; idx < bytes; idx++) {
mraa_i2c_write_byte_data(m_i2c_lcd_control, data[idx], LCD_DATA);
}
return error;
}
/*
* **************
* virtual area
* **************
*/
mraa_result_t
SSD1308::write(std::string msg)
{
mraa_result_t error = MRAA_SUCCESS;
uint8_t data[2] = { 0x40, 0 };
setAddressingMode(PAGE);
for (std::string::size_type i = 0; i < msg.size(); ++i) {
writeChar(m_i2c_lcd_control, msg[i]);
}
return error;
}
mraa_result_t
SSD1308::setCursor(int row, int column)
{
mraa_result_t error = MRAA_SUCCESS;
error = mraa_i2c_write_byte_data(m_i2c_lcd_control,
BASE_PAGE_START_ADDR + row,
LCD_CMD); // set page address
error = mraa_i2c_write_byte_data(m_i2c_lcd_control,
BASE_LOW_COLUMN_ADDR + (8 * column & 0x0F),
LCD_CMD); // set column lower address
error = mraa_i2c_write_byte_data(m_i2c_lcd_control,
BASE_HIGH_COLUMN_ADDR + ((8 * column >> 4) & 0x0F),
LCD_CMD); // set column higher address
return error;
}
mraa_result_t
SSD1308::clear()
{
mraa_result_t error = MRAA_SUCCESS;
uint8_t columnIdx, rowIdx;
mraa_i2c_write_byte_data(m_i2c_lcd_control, DISPLAY_CMD_OFF, LCD_CMD); // display off
for (rowIdx = 0; rowIdx < 8; rowIdx++) {
setCursor(rowIdx, 0);
// clear all columns
for (columnIdx = 0; columnIdx < 16; columnIdx++) {
writeChar(m_i2c_lcd_control, ' ');
}
}
mraa_i2c_write_byte_data(m_i2c_lcd_control, DISPLAY_CMD_ON, LCD_CMD); // display on
home();
return MRAA_SUCCESS;
}
mraa_result_t
SSD1308::home()
{
return setCursor(0, 0);
}
/*
* **************
* private area
* **************
*/
mraa_result_t
SSD1308::writeChar(mraa_i2c_context ctx, uint8_t value)
{
if (value < 0x20 || value > 0x7F) {
value = 0x20; // space
}
for (uint8_t idx = 0; idx < 8; idx++) {
mraa_i2c_write_byte_data(m_i2c_lcd_control, BasicFont[value - 32][idx], LCD_DATA);
}
}
mraa_result_t
SSD1308::setNormalDisplay()
{
return mraa_i2c_write_byte_data(m_i2c_lcd_control,
DISPLAY_CMD_SET_NORMAL_1308,
LCD_CMD); // set to normal display '1' is ON
}
mraa_result_t
SSD1308::setAddressingMode(displayAddressingMode mode)
{
mraa_i2c_write_byte_data(m_i2c_lcd_control,
DISPLAY_CMD_MEM_ADDR_MODE,
LCD_CMD); // set addressing mode
mraa_i2c_write_byte_data(m_i2c_lcd_control, mode, LCD_CMD); // set page addressing mode
}