upm/src/lcd/ssd1308.cxx
Jon Trulson 1647f572ff lcd: remove i2c context from LCD base class
This commit removes the I2C context from the LCD base class and moves
it into each of the drivers.

In addition, the createChar() virtual function was removed from the
base class, as it directly used the now non-existant i2c context, and
it would not work on anything other than hd44780 based controllers and
displays anyway. Also, it is likely the capability itself, as well as
the data required to implement it, is going to be different from
device to device.

createChar() has been added to the Lcm1602 driver which can support it.

While doing this work, the LCD base class m_name is now set appropriately
in the driver constructors.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
2015-07-21 17:36:09 -07:00

169 lines
4.6 KiB
C++

/*
* 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 "hd44780_bits.h"
#include "ssd1308.h"
using namespace upm;
SSD1308::SSD1308(int bus_in, int addr_in) : m_i2c_lcd_control(bus_in)
{
m_lcd_control_address = addr_in;
m_name = "SSD1308";
mraa_result_t error = m_i2c_lcd_control.address(m_lcd_control_address);
if (error != MRAA_SUCCESS) {
fprintf(stderr, "Failed to initialize i2c bus\n");
return;
}
m_i2c_lcd_control.writeReg(LCD_CMD, DISPLAY_CMD_OFF); // display off
usleep(4500);
m_i2c_lcd_control.writeReg(LCD_CMD, DISPLAY_CMD_ON); // 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++) {
m_i2c_lcd_control.writeReg(LCD_DATA, data[idx]);
}
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(msg[i]);
}
return error;
}
mraa_result_t
SSD1308::setCursor(int row, int column)
{
mraa_result_t error = MRAA_SUCCESS;
error = m_i2c_lcd_control.writeReg(LCD_CMD, BASE_PAGE_START_ADDR + row); // set page address
error = m_i2c_lcd_control.writeReg(LCD_CMD,
BASE_LOW_COLUMN_ADDR + (8 * column & 0x0F)); // set column
// lower address
error = m_i2c_lcd_control.writeReg(LCD_CMD,
BASE_HIGH_COLUMN_ADDR +
((8 * column >> 4) & 0x0F)); // set column higher address
return error;
}
mraa_result_t
SSD1308::clear()
{
mraa_result_t error = MRAA_SUCCESS;
uint8_t columnIdx, rowIdx;
m_i2c_lcd_control.writeReg(LCD_CMD, DISPLAY_CMD_OFF); // 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.writeReg(LCD_CMD, DISPLAY_CMD_ON); // display on
home();
return MRAA_SUCCESS;
}
mraa_result_t
SSD1308::home()
{
return setCursor(0, 0);
}
/*
* **************
* private area
* **************
*/
mraa_result_t
SSD1308::writeChar(uint8_t value)
{
mraa_result_t rv;
if (value < 0x20 || value > 0x7F) {
value = 0x20; // space
}
for (uint8_t idx = 0; idx < 8; idx++) {
rv = m_i2c_lcd_control.writeReg(LCD_DATA, BasicFont[value - 32][idx]);
}
return rv;
}
mraa_result_t
SSD1308::setNormalDisplay()
{
return m_i2c_lcd_control.writeReg(LCD_CMD,
DISPLAY_CMD_SET_NORMAL_1308); // set to normal display '1' is
// ON
}
mraa_result_t
SSD1308::setAddressingMode(displayAddressingMode mode)
{
mraa_result_t rv;
rv =m_i2c_lcd_control.writeReg(LCD_CMD, DISPLAY_CMD_MEM_ADDR_MODE); // set addressing mode
rv =m_i2c_lcd_control.writeReg(LCD_CMD, mode); // set page addressing mode
return rv;
}