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lcm1602: Add support for various LCD configurations / sizes
Signed-off-by: Sergey Kiselev <sergey.kiselev@intel.com> Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Sergey Kiselev
Mihai Tudor Panu
parent
5ff625eaf4
commit
1713d44a4b
54
examples/c++/lcd-parallel.cxx
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54
examples/c++/lcd-parallel.cxx
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@ -0,0 +1,54 @@
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/*
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* Author: Sergey Kiselev <sergey.kiselev@intel.com>
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* Author: Yevgeniy Kiveish <yevgeniy.kiveisha@intel.com>
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* Copyright (c) 2014 - 2015 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all 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,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <upm/lcm1602.h>
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int
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main(int argc, char **argv)
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{
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//! [Interesting]
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// LCD connection:
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// LCD RS pin to digital pin 8
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// LCD Enable pin to digital pin 13
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// LCD D4 pin to digital pin 2
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// LCD D5 pin to digital pin 3
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// LCD D6 pin to digital pin 4
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// LCD D7 pin to digital pin 5
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// LCD R/W pin to ground
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// 10K trimmer potentiometer:
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// ends to +5V and ground
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// wiper to LCD VO pin (pin 3)
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upm::Lcm1602 *lcd = new upm::Lcm1602(8, 13, 2, 3, 4, 5, 20, 2);
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lcd->setCursor(0,0);
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lcd->write("Hello World");
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lcd->setCursor(1,2);
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lcd->write("Hello World");
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printf("Sleeping for 5 seconds\n");
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sleep(5);
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delete lcd;
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//! [Interesting]
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return 0;
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}
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@ -39,10 +39,12 @@
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using namespace upm;
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Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander) :
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Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander,
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uint8_t numColumns, uint8_t numRows) :
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m_i2c_lcd_control(new mraa::I2c(bus_in)),
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m_gpioRS(0), m_gpioEnable(0), m_gpioD0(0),
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m_gpioD1(0), m_gpioD2(0), m_gpioD3(0)
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m_gpioD1(0), m_gpioD2(0), m_gpioD3(0),
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m_numColumns(numColumns), m_numRows(numRows)
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{
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mraa::Result error = mraa::SUCCESS;
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m_name = "Lcm1602 (I2C)";
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@ -97,11 +99,13 @@ Lcm1602::Lcm1602(int bus_in, int addr_in, bool isExpander) :
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}
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Lcm1602::Lcm1602(uint8_t rs, uint8_t enable, uint8_t d0,
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uint8_t d1, uint8_t d2, uint8_t d3) :
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uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t numColumns, uint8_t numRows) :
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m_i2c_lcd_control(0),
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m_gpioRS(new mraa::Gpio(rs)), m_gpioEnable(new mraa::Gpio(enable)),
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m_gpioD0(new mraa::Gpio(d0)), m_gpioD1(new mraa::Gpio(d1)),
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m_gpioD2(new mraa::Gpio(d2)), m_gpioD3(new mraa::Gpio(d3))
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m_gpioD2(new mraa::Gpio(d2)), m_gpioD3(new mraa::Gpio(d3)),
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m_numColumns(numColumns), m_numRows(numRows)
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{
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mraa::Result error = mraa::SUCCESS;
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m_name = "Lcm1602 (4-bit GPIO)";
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@ -196,9 +200,54 @@ mraa::Result
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Lcm1602::setCursor(int row, int column)
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{
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mraa::Result error = mraa::SUCCESS;
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column = column % m_numColumns;
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uint8_t offset = column;
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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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switch (m_numRows)
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{
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case 1:
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// Single row displays with more than 8 columns usually have their
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// DDRAM split in two halves. The first half starts at address 00.
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// The second half starts at address 40. E.g. 16x2 DDRAM mapping:
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// 00 01 02 03 04 05 06 07 40 41 42 43 44 45 46 47
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if (m_numColumns > 8)
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{
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offset = (column % (m_numColumns / 2)) +
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(column / (m_numColumns / 2)) * 0x40;
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}
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break;
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case 2:
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// this should work for any display with two rows
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// DDRAM mapping:
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// 00 .. 27
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// 40 .. 67
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offset += row * 0x40;
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break;
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case 4:
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if (m_numColumns == 16)
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{
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// 16x4 display
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// DDRAM mapping:
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// 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F
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// 40 41 42 43 43 45 46 47 48 49 4A 4B 4C 4D 4E 4F
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// 10 11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F
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// 50 51 52 53 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F
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int row_addr[] = { 0x00, 0x40, 0x10, 0x50 };
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offset += row_addr[row];
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}
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else
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{
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// 20x4 display
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// DDRAM mapping:
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// 00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
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// 40 41 42 43 43 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53
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// 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
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// 54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67
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int row_addr[] = { 0x00, 0x40, 0x14, 0x54 };
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offset += row_addr[row];
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}
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break;
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}
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return command(LCD_CMD | offset);
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}
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@ -72,7 +72,8 @@ class Lcm1602 : public LCD
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* @param isExpander True if we are dealing with an I2C expander,
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* false otherwise. Default is true.
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*/
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Lcm1602(int bus, int address, bool isExpander=true);
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Lcm1602(int bus, int address, bool isExpander=true,
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uint8_t numColumns = 16, uint8_t numRows = 4);
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/**
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* Lcm1602 alternate constructor, used for GPIO based hd44780
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@ -87,7 +88,8 @@ class Lcm1602 : public LCD
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* @param d3 Data 3 pin
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*/
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Lcm1602(uint8_t rs, uint8_t enable,
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
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uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3,
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uint8_t numColumns = 16, uint8_t numRows = 4);
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/**
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* Lcm1602 destructor
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@ -225,6 +227,10 @@ class Lcm1602 : public LCD
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uint8_t m_displayControl;
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uint8_t m_entryDisplayMode;
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// Display size
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uint8_t m_numColumns;
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uint8_t m_numRows;
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// Add a command() and data() virtual member functions, with a
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// default implementation in lcm1602. This is expected to be
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// implemented by derived classes with different needs (Jhd1313m1,
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