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// Reprap I2C LCD code this is to be used with the Reprap I2C interface board
// 1.0 Writen By Bruce Wattendorf
#include "i2c_lcd.h"
#include <Wire.h> // REQUIRED Used for the I2C Communications
#include <string.h> //needed for strlen()
//*******************************************************************************************************************
// VARIABLE INITS
//*******************************************************************************************************************
byte LCDCONT = 0; // REQUIRED
byte button = 0; // REQUIRED
int i =0; // REQUIRED
int g_num_lines = screen_lines; // this is the number of lines your screen has
int buttonPress =0;
int count = 0;
//*******************************************************************************************************************
// Functions and Subroutines
//*******************************************************************************************************************
//*******************************************************************************************************************
// REQUIRED I2C TX RX
//*******************************************************************************************************************
void I2C_TX(byte device, byte regadd, byte tx_data) // Transmit I2C Data
{
Wire.beginTransmission(device);
Wire.send(regadd);
Wire.send(tx_data);
Wire.endTransmission();
}
void I2C_RX(byte devicerx, byte regaddrx) // Receive I2C Data
{
Wire.beginTransmission(devicerx);
Wire.send(regaddrx);
Wire.endTransmission();
Wire.requestFrom(int(devicerx), 1);
byte c = 0;
if(Wire.available())
{
byte c = Wire.receive();
button = c >>3;
}
}
//*******************************************************************************************************************
// REQUIRED LCD INIT
//*******************************************************************************************************************
void LCDinit()
{
// Only used with port expander
LCDCONT = RS_pin | E_pin;
I2C_TX(MCP23017,GPIOB,LCDCONT);
delay(50);
LCDcommandWrite(B00110000); // Standard Hitachi initialization for 8-bit mode form sepc sheets
delay(60);
LCDcommandWrite(B00110000);
delay(60);
LCDcommandWrite(B00110000);
delay(60);
LCDcommandWrite(B00111000);
delay(60);
LCDcommandWrite(B00001000);
delay(60);
LCDcommandWrite(CMD_CLR);
delay(60);
LCDcommandWrite(B00000110);
delay(60);
LCDcommandWrite(B0001100);
delay(60);
}
//*******************************************************************************************************************
// REQUIRED PORTEXPANDER INIT
//*******************************************************************************************************************
void portexpanderinit()
{
// --- Set I/O Direction
I2C_TX(MCP23017,IODIRB,B11111000);
I2C_TX(MCP23017,IODIRA,B00000000);
// --- Set I/O Polarity
I2C_TX(MCP23017,IPOLA,B00000000);
I2C_TX(MCP23017,IPOLB,B11111000);
// --- Set ALL Bits of GPIOA
I2C_TX(MCP23017,GPIOA,B00000000);
// --- Set Weak Pull-Up on Bits 7 of GPIOB
I2C_TX(MCP23017,GPPUB,B11111000);
// --- Set Default on Bits 7 of GPIOB
I2C_TX(MCP23017,DEFVALB,B00000000);
// --- Set Use Default on Bits 7 of GPIOB
I2C_TX(MCP23017,INTCONB,B10000000);
// --- Set IOC on Bits 7 of GPIOB
I2C_TX(MCP23017,GPINTENB,B10011000);
// --- Set active low of int pin
I2C_TX(MCP23017,IOCON,B00110000);
}
//*******************************************************************************************************************
// REQUIRED LCD WRITE / COMMAND
//*******************************************************************************************************************
// this is the LCD command used to send a command to the lcd screen
void LCDcommandWrite(byte cmdlcd)
{
LCDCONT =0; // was bcf RS_pin
I2C_TX(MCP23017,GPIOB,LCDCONT);
LCDprint(cmdlcd);
delay(20);
}
// this is the LCD print command used to print to the screen this will print where the cursor is at
void LCDprint(byte lcdChar)
{
I2C_TX(MCP23017,GPIOA,lcdChar);
LCDCONT = LCDCONT | E_pin; // If RS is set then it stays set
delay(2);
I2C_TX(MCP23017,GPIOB,LCDCONT);
LCDCONT = RS_pin;
I2C_TX(MCP23017,GPIOB,LCDCONT);
}
//this is the LCD clear command
void LCDclear()
{
LCDcommandWrite(CMD_CLR);
delay(1);
}
//this is to set the cursor to the home position
void LCDhome()
{
LCDcommandWrite(CMD_HOME);
}
//scroll whole display to left
void LCDleftscroll(int num_chars, int delay_time)
{
for (int i=0; i<num_chars; i++) {
LCDcommandWrite(CMD_LEFT);
delay(delay_time);
}
}
// this is to move the cursor to a specific location before printing to LCD
void LCDcursorTO(int line_num, int x)
{
//first put cursor home
LCDcommandWrite(CMD_HOME);
//if we are on a 1-line display, set line_num to 1st line, regardless of given
if (g_num_lines==1)
{line_num=1;
}
//offset 40 Char in if secound line requested
if (line_num == 2)
{
x +=40;
}
//advance the cursor to the right according to position. (second line starts at position 40).
for (int i=0; i<x; i++)
{
LCDcommandWrite(0x14);
}
}
//this is the printIn command this will print a line and you do not need to add how long the line is
void LCDprintIn(char msg[])
{
for (i=0;i < strlen(msg);i++)
{
LCDprint(msg[i]);
}
}
// this command is to check for a button press
//void LCDcheckbutton() // Use serial monitor at 9600bps to see buttons that are pressed
//{
// I2C_RX(MCP23017,GPIOB);
// buttonPress = int(button);
// switch (buttonPress)
//}
// note to be added BUTTON interface commands for the 5 buttons
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