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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2025 Aidan MacDonald
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "system.h"
#include "kernel.h"
#include "lcd.h"
#include "spi-stm32h7.h"
#include "gpio-stm32h7.h"
#include "stm32h7/rcc.h"
struct stm_spi_config spi_cfg = {
.num = STM_SPI5,
.mode = STM_SPIMODE_HALF_DUPLEX,
.proto = STM_SPIPROTO_MOTOROLA,
.frame_bits = 9,
.hw_cs_output = true,
};
struct stm_spi spi;
#define ili_cmd(cmd, ...) \
do { \
uint16_t arr[] = {cmd, __VA_ARGS__}; \
for (size_t i = 1; i < ARRAYLEN(arr); ++i) \
arr[i] |= 0x100; \
stm_spi_transmit(&spi, arr, sizeof(arr)); \
} while (0)
static void set_row_column_address(int x, int y, int w, int h)
{
ili_cmd(0x2a, x >> 8, x & 0xff, (w-1) >> 8, (w-1) & 0xff);
ili_cmd(0x2b, y >> 8, y & 0xff, (h-1) >> 8, (h-1) & 0xff);
}
void lcd_init_device(void)
{
/* Clock configuration -- should be 12 MHz (SPI clock is 1/2 of HSE) */
st_writef(RCC_D2CCIP1R, SPI45SEL_V(HSE));
st_writef(RCC_APB2ENR, SPI5EN(1));
/* Configure SPI bus */
stm_spi_init(&spi, &spi_cfg);
/* Ensure controller is reset */
gpio_set_level(GPIO_LCD_RESET, 0);
sleep(12);
gpio_set_level(GPIO_LCD_RESET, 1);
sleep(12);
/* Sleep out */
ili_cmd(0x11);
sleep(12);
/* memory access control (X/Y invert, BGR panel) */
ili_cmd(0x36, 0xc8);
/* pixel format set (16bpp) */
ili_cmd(0x3a, 0x55);
/* display ON */
ili_cmd(0x29);
}
bool lcd_active(void)
{
return true;
}
void lcd_update(void)
{
lcd_update_rect(0, 0, LCD_WIDTH, LCD_HEIGHT);
}
void lcd_update_rect(int x, int y, int width, int height)
{
/* row buffer to minimize time wasted in post-transaction delay */
static uint16_t row[LCD_WIDTH * 2];
if (x < 0)
x = 0;
else if (x >= LCD_WIDTH)
x = LCD_WIDTH - 1;
if (y < 0)
y = 0;
else if (y >= LCD_HEIGHT)
y = LCD_HEIGHT - 1;
if (width > LCD_WIDTH - x)
width = LCD_WIDTH - x;
if (height > LCD_HEIGHT - y)
height = LCD_HEIGHT - y;
set_row_column_address(x, y, width, height);
ili_cmd(0x2c);
for (int py = y; py < height; ++py)
{
for (int px = x; px < width; ++px)
{
fb_data *fb = FBADDR(px, py);
uint16_t *data = &row[px * 2];
data[0] = 0x100;
data[0] |= (FB_UNPACK_RED(*fb) >> 3) << 3;
data[0] |= (FB_UNPACK_GREEN(*fb) >> 5);
data[1] = 0x100;
data[1] |= ((FB_UNPACK_GREEN(*fb) >> 2) & 0x7) << 5;
data[1] |= (FB_UNPACK_BLUE(*fb) >> 3);
}
stm_spi_transmit(&spi, &row[x * 2], width * sizeof(*row) * 2);
}
}
|
