-
Notifications
You must be signed in to change notification settings - Fork 1
/
lcd.c
208 lines (179 loc) · 5.11 KB
/
lcd.c
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
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
/*
* Lab Power
*
* LCD
*
* Drive the NHD-C12865AR LCD
* - SPI Mode (hardcoded)
* - PE0 - CS
* - PE1 - A0
* - PC4 - R - Reset
* - PC5 - SI - SPI Data
* - PC7 - SCL - SPI Clock
*
* Backlight
* - PC1 - OC0B
*/
#include <stdio.h>
#include <avr/io.h>
#include <util/delay.h>
#include "lcd.h"
#include "st7565.h"
//#include "conf_st7565r.h"
//#include <common/components/display/st7565r/st7565r.h>
#define LCD_CS PIN0_bm
#define LCD_A0 PIN1_bm
#define LCD_R PIN4_bm
#define LCD_SCL PIN7_bm
#define LCD_SI PIN5_bm
uint8_t lcd_contrast=LCD_ST7565R_DEFAULT_CONTRAST;
FILE LCD = FDEV_SETUP_STREAM (lcd_putc, NULL, _FDEV_SETUP_WRITE);
/*
* initialisation:
* RES low for 10 ms
* CS low
* A0 low = control
* A0 high = data
* SPI speed min 50ns/cycle -> max 20Mhz
*/
void lcd_init () {
// Setup ports
printf("lcd_init\n");
// set up ports
PORTE.DIRSET = LCD_CS | LCD_A0;
PORTC.DIRSET = LCD_R | LCD_SCL | LCD_SI;
PORTE.OUTSET = LCD_CS | LCD_A0;
PORTC.OUTSET = LCD_R;
_delay_ms(1);
// Reset the display (1ms)
PORTC.OUTCLR = LCD_R;
_delay_ms(1);
PORTC.OUTSET = LCD_R;
// Setup SPI
PORTC.DIRSET = LCD_SCL | LCD_SI;
// SPIC_CTRL = SPI_ENABLE_bm | SPI_MASTER_bm | SPI_MODE0_bm | SPI_MODE1_bm | SPI_PRESCALER0_bm;
// Idle=high, sample on rising clock, /2 clock = 16 Mhz
SPIC_CTRL = SPI_ENABLE_bm | SPI_MASTER_bm | SPI_MODE0_bm | SPI_MODE1_bm | SPI_CLK2X_bm;
PORTE.OUTCLR = LCD_CS | LCD_A0;
// send init commands
// A0 - ADC normal
// AE - Display off
// C0 - Output scan direction: normal
// A2 - Bias 0 1/65 duty cycle, 1/9 bias
// 2F - Power controller: all on
// 26 - V0 voltage regulator set
// 81 - Set contrast
// 2F - Contrast value 0-63/0-3F
// AF - display on
lcd_sendcmd(LCD_ST7565R_CMD_OFF);
lcd_sendcmd(LCD_ST7565R_CMD_ADCNORMAL); // Normal top down
lcd_sendcmd('\xC0');
// lcd_sendcmd('\xDF');
lcd_sendcmd(LCD_ST7565R_CMD_ADCREVERSE);
lcd_sendcmd('\x2F');
lcd_sendcmd('\x26');
// lcd_sendcmd('\x00');
// lcd_sendcmd('\x10');
lcd_setcontrast(lcd_contrast);
lcd_sendcmd(LCD_ST7565R_CMD_ON);
// A0 - ADC select - Normal
// A1 - ADC select - Reverse
// A2 - Bias 0
// A3 - Bias 1
// A4 - All pixels normal
// A5 - All pixels on
// A6 - Reverse Display Off
// A7 - Reverse Display On
// AA - Sleep mode on (+x)
// AB - Sleep mode off (+x)
// AE - Display off
// AF - Display on
// 4-7x - Display start line set
// Bx - Page address set
// 0x - Column address set lower nibble
// 1x - Column address set upper nibble
// E0 - Read-modify-write begin
// EE - End
// E2 - Reset
// Cx - Common output mode select C0/DF
// 2x - Power controller set
// 2x - V0 voltage regulator set
// 81 - Electronic volume mode set (+x)
// F8 - Booster ratio set (+x)
// E3 - NOP
// FF - Test (do not use)
}
/***********************
* Set backlight strength
*/
void lcd_setbacklight (uint8_t s) {
TCC0_CCB = s * 125;
// PORTC.DIRSET = PIN1_bm;
// if (s) PORTC.OUTSET=PIN1_bm;
// else PORTC.OUTCLR=PIN1_bm;
}
void lcd_setcontrast (uint8_t c) {
if ((c<4)||(c>60)) return;
lcd_sendcmd(LCD_ST7565R_CMD_CONTRAST);
lcd_sendcmd(c);
}
void lcd_clearscreen () {
unsigned char p,x;
lcd_sendcmd('\x40'); // Set start line
for (p=0; p<9; p++) {
// lcd_sendcmd('\xB0' + p); // Set page
lcd_sendcmd('\xB0'+p); // Set page
lcd_sendcmd('\x00'); // Column address
lcd_sendcmd('\x10'); // Column address
for (x=0; x<128; x++) lcd_senddata(0);
// for (x=0; x<132; x++) lcd_senddata((1<<x)|(128>>x));
}
}
/*
* Simple stdio adaptation to write to the LCD
*/
static uint8_t lcd_x; // Drawing position
static uint8_t lcd_y;
// Write a char to the current position with a 1 px space afterwards
int lcd_putc (char c, FILE *stream) {
uint8_t i;
if((c<' ')||(c>127)) return 0; // We only have charcters between space and 127
lcd_x += g_draw_char_clearBG(lcd_x, lcd_y, c);
// Clear a single pixer row after the character
for (i=0; i<8; i++) disp_set_pixel(lcd_x, lcd_y+i, 0);
lcd_x++;
return 1;
}
// Set the current position
void lcd_gotoxy(uint8_t x, uint8_t y) {
lcd_x = x;
lcd_y = y;
}
void lcd_putcxy (unsigned char c,unsigned char x,unsigned char y) {
unsigned char i;
lcd_sendcmd('\xB0'+x); // Set page
// lcd_sendcmd('\x00'+(x&15)); // Column address lower nibble
// lcd_sendcmd('\x10'+(x/16)); // Column address upper nibble
lcd_sendcmd('\x10'); // Column address upper nibble
lcd_senddata('\xFF');
for (i=0; i<6; i++) lcd_senddata('\x81');
lcd_senddata('\xFF');
}
void lcd_sendspi (unsigned char c) {
unsigned char dummy;
SPIC.DATA = c;
while ( !( SPIC.STATUS & SPI_IF_bm) );
dummy = SPIC.DATA;
}
void lcd_sendcmd (unsigned char c) {
// printf("lcd_sendcmd: %02x\n",c);
// Select command mode
PORTE.OUTCLR = LCD_A0;
lcd_sendspi(c);
}
void lcd_senddata (unsigned char c) {
// Select data mode
// printf("lcd_senddata: %02x\n",c);
PORTE.OUTSET = LCD_A0;
lcd_sendspi(c);
}