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
207
208
209
|
#include <string.h>
#include <stm32f4xx_gpio.h>
#include "misc.h"
#include "systick.h"
#include "lcd.h"
#include "font_petme128_8x8.h"
#define PYB_LCD_PORT (GPIOA)
#define PYB_LCD_CS1_PIN (GPIO_Pin_0)
#define PYB_LCD_RST_PIN (GPIO_Pin_1)
#define PYB_LCD_A0_PIN (GPIO_Pin_2)
#define PYB_LCD_SCL_PIN (GPIO_Pin_3)
#define PYB_LCD_SI_PIN (GPIO_Pin_4)
#define LCD_INSTR (0)
#define LCD_DATA (1)
static void lcd_out(int instr_data, uint8_t i) {
sys_tick_delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
if (instr_data == LCD_INSTR) {
PYB_LCD_PORT->BSRRH = PYB_LCD_A0_PIN; // A0=0; select instr reg
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
}
// send byte bigendian, latches on rising clock
for (uint32_t n = 0; n < 8; n++) {
sys_tick_delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
if ((i & 0x80) == 0) {
PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
}
i <<= 1;
sys_tick_delay_ms(0);
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
}
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
/*
in Python, native types:
CS1_PIN(const) = 0
n = int(0)
delay_ms(0)
PORT[word:BSRRH] = 1 << CS1_PIN
for n in range(0, 8):
delay_ms(0)
PORT[word:BSRRH] = 1 << SCL_PIN
if i & 0x80 == 0:
PORT[word:BSRRH] = 1 << SI_PIN
else:
PORT[word:BSRRL] = 1 << SI_PIN
i <<= 1
delay_ms(0)
PORT[word:BSRRL] = 1 << SCL_PIN
*/
}
/*
static void lcd_data_out(uint8_t i) {
delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_CS1_PIN; // CS=0; enable
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN; // A0=1; select data reg
// send byte bigendian, latches on rising clock
for (uint32_t n = 0; n < 8; n++) {
delay_ms(0);
PYB_LCD_PORT->BSRRH = PYB_LCD_SCL_PIN; // SCL=0
if ((i & 0x80) == 0) {
PYB_LCD_PORT->BSRRH = PYB_LCD_SI_PIN; // SI=0
} else {
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN; // SI=1
}
i <<= 1;
delay_ms(0);
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN; // SCL=1
}
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN; // CS=1; disable
}
*/
#define LCD_BUF_W (16)
#define LCD_BUF_H (4)
char lcd_buffer[LCD_BUF_W * LCD_BUF_H];
int lcd_line;
int lcd_column;
int lcd_next_line;
void lcd_init() {
// set the outputs high
PYB_LCD_PORT->BSRRL = PYB_LCD_CS1_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_A0_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_SCL_PIN;
PYB_LCD_PORT->BSRRL = PYB_LCD_SI_PIN;
// make them push/pull outputs
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = PYB_LCD_CS1_PIN | PYB_LCD_RST_PIN | PYB_LCD_A0_PIN | PYB_LCD_SCL_PIN | PYB_LCD_SI_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(PYB_LCD_PORT, &GPIO_InitStructure);
// init the LCD
sys_tick_delay_ms(1); // wait a bit
PYB_LCD_PORT->BSRRH = PYB_LCD_RST_PIN; // RST=0; reset
sys_tick_delay_ms(1); // wait for reset; 2us min
PYB_LCD_PORT->BSRRL = PYB_LCD_RST_PIN; // RST=1; enable
sys_tick_delay_ms(1); // wait for reset; 2us min
lcd_out(LCD_INSTR, 0xa0); // ADC select, normal
lcd_out(LCD_INSTR, 0xc8); // common output mode select, reverse
lcd_out(LCD_INSTR, 0xa2); // LCD bias set, 1/9 bias
lcd_out(LCD_INSTR, 0x2f); // power control set, 0b111=(booster on, vreg on, vfollow on)
lcd_out(LCD_INSTR, 0x21); // v0 voltage regulator internal resistor ratio set, 0b001=small
lcd_out(LCD_INSTR, 0x81); // electronic volume mode set
lcd_out(LCD_INSTR, 0x34); // electronic volume register set, 0b110100
lcd_out(LCD_INSTR, 0x40); // display start line set, 0
lcd_out(LCD_INSTR, 0xaf); // LCD display, on
// clear display
for (int page = 0; page < 4; page++) {
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10); // column address set upper
lcd_out(LCD_INSTR, 0x00); // column address set lower
for (int i = 0; i < 128; i++) {
lcd_out(LCD_DATA, 0x00);
}
}
for (int i = 0; i < LCD_BUF_H * LCD_BUF_W; i++) {
lcd_buffer[i] = ' ';
}
lcd_line = 0;
lcd_column = 0;
lcd_next_line = 0;
}
void lcd_print_str(const char *str) {
lcd_print_strn(str, strlen(str));
}
void lcd_print_strn(const char *str, unsigned int len) {
int redraw_min = lcd_line * LCD_BUF_W + lcd_column;
int redraw_max = redraw_min;
int did_new_line = 0;
for (; len > 0; len--, str++) {
// move to next line if needed
if (lcd_next_line) {
if (lcd_line + 1 < LCD_BUF_H) {
lcd_line += 1;
} else {
lcd_line = LCD_BUF_H - 1;
for (int i = 0; i < LCD_BUF_W * (LCD_BUF_H - 1); i++) {
lcd_buffer[i] = lcd_buffer[i + LCD_BUF_W];
}
for (int i = 0; i < LCD_BUF_W; i++) {
lcd_buffer[LCD_BUF_W * (LCD_BUF_H - 1) + i] = ' ';
}
redraw_min = 0;
redraw_max = LCD_BUF_W * LCD_BUF_H;
}
lcd_next_line = 0;
lcd_column = 0;
did_new_line = 1;
}
if (*str == '\n') {
lcd_next_line = 1;
} else if (lcd_column >= LCD_BUF_W) {
lcd_next_line = 1;
str -= 1;
len += 1;
} else {
lcd_buffer[lcd_line * LCD_BUF_W + lcd_column] = *str;
lcd_column += 1;
int max = lcd_line * LCD_BUF_W + lcd_column;
if (max > redraw_max) {
redraw_max = max;
}
}
}
int last_page = -1;
for (int i = redraw_min; i < redraw_max; i++) {
int page = i / LCD_BUF_W;
if (page != last_page) {
int offset = 8 * (i - (page * LCD_BUF_W));
lcd_out(LCD_INSTR, 0xb0 | page); // page address set
lcd_out(LCD_INSTR, 0x10 | ((offset >> 4) & 0x0f)); // column address set upper
lcd_out(LCD_INSTR, 0x00 | (offset & 0x0f)); // column address set lower
last_page = page;
}
int chr = lcd_buffer[i];
if (chr < 32 || chr > 126) {
chr = 127;
}
const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
for (int i = 0; i < 8; i++) {
lcd_out(LCD_DATA, chr_data[i]);
}
}
if (did_new_line) {
sys_tick_delay_ms(200);
}
}
|
