1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#include "i2c_lcd.h"
#include <Wire.h> // REQUIRED Used for the I2C Communications
//*******************************************************************************************************************
// VARIABLE INITS
//*******************************************************************************************************************
byte LCDCONT = 0; // REQUIRED
byte button = 0; // REQUIRED
int i =0; // REQUIRED
int buttonPress =0;
int count = 0;
//*******************************************************************************************************************
// REQUIRED SET-UP
//*******************************************************************************************************************
void setup()
{
Wire.begin(); // join i2c bus (address optional for master)
portexpanderinit();
delay(200);
lcdinit();
delay(500);
LCDcmd(ClrLCD);
Serial.begin(9600); // Only used for debugging - not required
}
//*******************************************************************************************************************
// 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);
LCDcmd(B00110000); // Standard Hitachi initialization for 8-bit mode form sepc sheets
delay(60);
LCDcmd(B00110000);
delay(60);
LCDcmd(B00110000);
delay(60);
LCDcmd(B00111000);
delay(60);
LCDcmd(B00001000);
delay(60);
LCDcmd(ClrLCD);
delay(60);
LCDcmd(B00000110);
delay(60);
LCDcmd(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
//*******************************************************************************************************************
void LCDcmd(byte cmdlcd)
{
LCDCONT =0; // was bcf RS_pin
I2C_TX(MCP23017,GPIOB,LCDCONT);
LCDwr(cmdlcd);
delay(20);
}
void LCDwr(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);
}
|
