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
210
211
212
213
214
215
216
217
|
#include "arch.h"
#include "arch/arm/cortex-m4/mpu.h"
#include "arch/stm32l4xxx/peripherals/clock.h"
#include "arch/stm32l4xxx/peripherals/spi.h"
#include "arch/stm32l4xxx/peripherals/dma.h"
#include "arch/stm32l4xxx/peripherals/irq.h"
#include "arch/stm32l4xxx/peripherals/rcc.h"
#include "arch/stm32l4xxx/peripherals/system.h"
#include "drv/ws2812B/ws2812b.h"
#include "kern/delay.h"
#include "kern/dma/dma_manager.h"
#include "kern/gpio/gpio_manager.h"
#include "kern/gpio/sysled.h"
#include "kern/init.h"
#include "kern/log.h"
#include "kern/mem.h"
#include "kern/mpu/mpu_manager.h"
#include "kern/panic.h"
#include "kern/priv.h"
#include "kern/spi/spi_manager.h"
#include "kern/systick/systick_manager.h"
#include "user/syscall.h"
void on_hard_fault()
{
panic("Hard fault encountered!\n");
}
#ifdef ARCH_STM32L4
spi_t* configure_spi()
{
int ec = 0;
gpio_enable_alternate_function(
GPIO_ALTERNATE_FUNCTION_SPI1_MOSI, GPIO_PIN_PA7, &ec);
if (ec) {
panic("Unable to set pin PA7 (ec=%d)\n", ec);
}
gpio_enable_alternate_function(
GPIO_ALTERNATE_FUNCTION_SPI1_NSS, GPIO_PIN_PA4, &ec);
if (ec) {
panic("Unable to set pin PA4 (ec=%d)\n", ec);
}
gpio_enable_alternate_function(
GPIO_ALTERNATE_FUNCTION_SPI1_SCK, GPIO_PIN_PA5, &ec);
if (ec) {
panic("Unable to set pin PA5 (ec=%d)\n", ec);
}
spi_opts_t opts = DEFAULT_SPI_OPTS;
opts.endianness = ENDIANNESS_BIG;
spi_t* spi = reserve_spi(SPI_SELECT_SPI1, &opts, &ec);
if (ec) {
panic("Unable to reserve spi bus. (ec=%d)\n", ec);
}
return spi;
}
static uint8_t* compiled;
static size_t compiled_len;
extern uint8_t sintable[256];
static uint32_t time;
static void on_systick(void* nil)
{
++time;
}
static void write_rgb(spi_t* spi, uint8_t red, uint8_t green, uint8_t blue)
{
#undef BIT
#define BIT(b, n) (!!((b) & (1 << (n))))
spi_write_8_sync(
spi,
(1 << 7) | (BIT(green, 7) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(green, 6) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(green, 5) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(green, 4) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(green, 3) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(green, 2) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(green, 1) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(green, 0) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(red, 7) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(red, 6) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(red, 5) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(red, 4) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(red, 3) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(red, 2) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(red, 1) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(red, 0) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(blue, 7) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(blue, 6) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(blue, 5) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(blue, 4) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(blue, 3) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(blue, 2) << 2) | (0 << 1) | (0 << 0));
spi_write_8_sync(
spi,
(1 << 7) | (BIT(blue, 1) << 6) | (0 << 5) | (0 << 4) | (1 << 3) |
(BIT(blue, 0) << 2) | (0 << 1) | (0 << 0));
}
void latch(spi_t* spi)
{
for (int i = 0; i < 20; ++i) {
spi_write_8_sync(spi, 0);
}
}
#define min(a, b) (a) < (b) ? (a) : (b)
static uint8_t amp(uint8_t in)
{
uint32_t out = in;
for (int i = 0; i < 20; ++i) {
out = (out * in) / 256;
}
return min(out, 255);
}
static uint32_t bytescale(uint32_t n, uint32_t sc)
{
return n * sc / 255;
}
/* Main function. This gets executed from the interrupt vector defined above. */
int main()
{
klogf("Entering main\n");
gpio_reserved_pin_t sysled = get_sysled();
systick_add_callback(on_systick, NULL);
enable_systick(1000);
#define SIZE 256
rgb_t rgb[SIZE];
for (int i = 0; i < SIZE; ++i) {
rgb[i].g = 0xff;
rgb[i].r = 0xff;
rgb[i].b = 0xff;
}
uint32_t red = 0x40;
uint32_t green = 0x40;
uint32_t brightness = 255;
klogf("Configure Spi\n");
spi_t* spi = configure_spi();
klogf("Done Configuring Spi\n");
for (int i = 0; i < 100; ++i) {
write_rgb(spi, 0, 0, 0);
}
klogf("Latch\n");
latch(spi);
for (;;) {
set_gpio_pin_high(sysled);
klogf("Frame\n");
latch(spi);
int i;
for (i = 0; i < SIZE; ++i) {
red = byte_sin(time / 1000 + i * 4);
green = 255 - red;
brightness = 3 * byte_sin(time / 5000) / 4 + 63;
uint32_t white = amp(byte_sin(time / 6310 + i / 4));
write_rgb(
spi,
bytescale(min(red + white, 255), brightness),
bytescale(min(green + white, 255), brightness),
bytescale(white, brightness));
}
set_gpio_pin_low(sysled);
latch(spi);
}
}
#endif
|
