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lcm1602: add 4-bit gpio support with RS and Enable pins

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In addition, move the command/data sending methods into the protected
block so that derived classes can use them if need be.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Jon Trulson
2015-07-09 16:13:51 -06:00
committed by Mihai Tudor Panu
parent 8462e8ce52
commit 5a6fb122ec
2 changed files with 186 additions and 18 deletions
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34
src/lcd/lcm1602.h
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@ -7,6 +7,8 @@
* Author: Thomas Ingleby <thomas.c.ingleby@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Contributions: Jon Trulson <jtrulson@ics.com>
*
* Permission is hereby granted, free of uint8_tge, 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
@ -29,6 +31,7 @@
#include <string>
#include <mraa/i2c.hpp>
#include <mraa/gpio.hpp>
#include "lcd.h"
namespace upm
@ -63,6 +66,22 @@ class Lcm1602 : public LCD
* @param address the slave address the lcd is registered on
*/
Lcm1602(int bus, int address);
/**
* Lcm1602 alternate constructor, used for GPIO based hd44780
* controllers supporting RS, Enable, and 4 data pins in 4-bit
* mode.
*
* @param rs register select pin
* @param enable enable pin
* @param d0 data 0 pin
* @param d1 data 1 pin
* @param d2 data 2 pin
* @param d3 data 3 pin
*/
Lcm1602(uint8_t rs, uint8_t enable,
uint8_t d0, uint8_t d1, uint8_t d2, uint8_t d3);
/**
* Lcm1602 Destructor
*/
@ -105,14 +124,25 @@ class Lcm1602 : public LCD
*/
mraa_result_t createChar(uint8_t charSlot, uint8_t charData[]);
private:
protected:
mraa_result_t send(uint8_t value, int mode);
mraa_result_t write4bits(uint8_t value);
mraa_result_t expandWrite(uint8_t value);
mraa_result_t pulseEnable(uint8_t value);
private:
int m_lcd_control_address;
mraa::I2c m_i2c_lcd_control;
mraa::I2c* m_i2c_lcd_control;
// true if using i2c, false otherwise (gpio)
bool m_isI2C;
// gpio operation
mraa::Gpio* m_gpioRS;
mraa::Gpio* m_gpioEnable;
mraa::Gpio* m_gpioD0;
mraa::Gpio* m_gpioD1;
mraa::Gpio* m_gpioD2;
mraa::Gpio* m_gpioD3;
};
}