summaryrefslogtreecommitdiff
path: root/drivers/led/aw20216s.c
blob: 8f3ebec5108f2bc5bf065fa1a1e326bfbcc63463 (plain)
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
/* Copyright 2021 Jasper Chan
 *           2023 Huckies <https://github.com/Huckies>
 *
 * 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 program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "aw20216s.h"
#include "wait.h"
#include "spi_master.h"

/* The AW20216S appears to be somewhat similar to the IS31FL743, although quite
 * a few things are different, such as the command byte format and page ordering.
 * The LED addresses start from 0x00 instead of 0x01.
 */
#define AW20216S_ID 0b1010 << 4

#define AW20216S_PAGE_FUNCTION 0x00 << 1   // PG0, Function registers
#define AW20216S_PAGE_PWM 0x01 << 1        // PG1, LED PWM control
#define AW20216S_PAGE_SCALING 0x02 << 1    // PG2, LED current scaling control
#define AW20216S_PAGE_PATCHOICE 0x03 << 1  // PG3, Pattern choice?
#define AW20216S_PAGE_PWMSCALING 0x04 << 1 // PG4, LED PWM + Scaling control?

#define AW20216S_WRITE 0
#define AW20216S_READ 1

#define AW20216S_REG_CONFIGURATION 0x00 // PG0
#define AW20216S_REG_GLOBALCURRENT 0x01 // PG0
#define AW20216S_REG_RESET 0x2F         // PG0
#define AW20216S_REG_MIXFUNCTION 0x46   // PG0

// Default value of AW20216S_REG_CONFIGURATION
// D7:D4 = 1011, SWSEL (SW1~SW12 active)
// D3 = 0?, reserved (apparently this should be 1 but it doesn't seem to matter)
// D2:D1 = 00, OSDE (open/short detection enable)
// D0 = 0, CHIPEN (write 1 to enable LEDs when hardware enable pulled high)
#define AW20216S_CONFIG_DEFAULT 0b10110000
#define AW20216S_MIXCR_DEFAULT 0b00000000
#define AW20216S_RESET_CMD 0xAE
#define AW20216S_CHIPEN 1
#define AW20216S_LPEN (0x01 << 1)

#define AW20216S_PWM_REGISTER_COUNT 216

#ifndef AW20216S_SCALING_MAX
#    define AW20216S_SCALING_MAX 150
#endif

#ifndef AW20216S_GLOBAL_CURRENT_MAX
#    define AW20216S_GLOBAL_CURRENT_MAX 150
#endif

#ifndef AW20216S_SPI_MODE
#    define AW20216S_SPI_MODE 0
#endif

#ifndef AW20216S_SPI_DIVISOR
#    define AW20216S_SPI_DIVISOR 4
#endif

uint8_t g_pwm_buffer[AW20216S_DRIVER_COUNT][AW20216S_PWM_REGISTER_COUNT];
bool    g_pwm_buffer_update_required[AW20216S_DRIVER_COUNT] = {false};

bool aw20216s_write(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t* data, uint8_t len) {
    static uint8_t s_spi_transfer_buffer[2] = {0};

    if (!spi_start(cs_pin, false, AW20216S_SPI_MODE, AW20216S_SPI_DIVISOR)) {
        spi_stop();
        return false;
    }

    s_spi_transfer_buffer[0] = (AW20216S_ID | page | AW20216S_WRITE);
    s_spi_transfer_buffer[1] = reg;

    if (spi_transmit(s_spi_transfer_buffer, 2) != SPI_STATUS_SUCCESS) {
        spi_stop();
        return false;
    }

    if (spi_transmit(data, len) != SPI_STATUS_SUCCESS) {
        spi_stop();
        return false;
    }

    spi_stop();
    return true;
}

static inline bool aw20216s_write_register(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t value) {
    // Little wrapper so callers need not care about sending a buffer
    return aw20216s_write(cs_pin, page, reg, &value, 1);
}

void aw20216s_soft_reset(pin_t cs_pin) {
    aw20216s_write_register(cs_pin, AW20216S_PAGE_FUNCTION, AW20216S_REG_RESET, AW20216S_RESET_CMD);
}

static void aw20216s_init_scaling(pin_t cs_pin) {
    // Set constant current to the max, control brightness with PWM
    for (uint8_t i = 0; i < AW20216S_PWM_REGISTER_COUNT; i++) {
        aw20216s_write_register(cs_pin, AW20216S_PAGE_SCALING, i, AW20216S_SCALING_MAX);
    }
}

static inline void aw20216s_init_current_limit(pin_t cs_pin) {
    // Push config
    aw20216s_write_register(cs_pin, AW20216S_PAGE_FUNCTION, AW20216S_REG_GLOBALCURRENT, AW20216S_GLOBAL_CURRENT_MAX);
}

static inline void aw20216s_soft_enable(pin_t cs_pin) {
    // Push config
    aw20216s_write_register(cs_pin, AW20216S_PAGE_FUNCTION, AW20216S_REG_CONFIGURATION, AW20216S_CONFIG_DEFAULT | AW20216S_CHIPEN);
}

static inline void aw20216s_auto_lowpower(pin_t cs_pin) {
    aw20216s_write_register(cs_pin, AW20216S_PAGE_FUNCTION, AW20216S_REG_MIXFUNCTION, AW20216S_MIXCR_DEFAULT | AW20216S_LPEN);
}

void aw20216s_init_drivers(void) {
    spi_init();

    aw20216s_init(AW20216S_CS_PIN_1, AW20216S_EN_PIN_1);
#if defined(AW20216S_CS_PIN_2)
    aw20216s_init(AW20216S_CS_PIN_2, AW20216S_EN_PIN_2);
#endif
}

void aw20216s_init(pin_t cs_pin, pin_t en_pin) {
    setPinOutput(en_pin);
    writePinHigh(en_pin);

    aw20216s_soft_reset(cs_pin);
    wait_ms(2);

    // Drivers should start with all scaling and PWM registers as off
    aw20216s_init_current_limit(cs_pin);
    aw20216s_init_scaling(cs_pin);

    aw20216s_soft_enable(cs_pin);
    aw20216s_auto_lowpower(cs_pin);
}

void aw20216s_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
    aw20216s_led_t led;
    memcpy_P(&led, (&g_aw20216s_leds[index]), sizeof(led));

    if (g_pwm_buffer[led.driver][led.r] == red && g_pwm_buffer[led.driver][led.g] == green && g_pwm_buffer[led.driver][led.b] == blue) {
        return;
    }
    g_pwm_buffer[led.driver][led.r]          = red;
    g_pwm_buffer[led.driver][led.g]          = green;
    g_pwm_buffer[led.driver][led.b]          = blue;
    g_pwm_buffer_update_required[led.driver] = true;
}

void aw20216s_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
    for (uint8_t i = 0; i < AW20216S_LED_COUNT; i++) {
        aw20216s_set_color(i, red, green, blue);
    }
}

void aw20216s_update_pwm_buffers(pin_t cs_pin, uint8_t index) {
    if (g_pwm_buffer_update_required[index]) {
        aw20216s_write(cs_pin, AW20216S_PAGE_PWM, 0, g_pwm_buffer[index], AW20216S_PWM_REGISTER_COUNT);
    }
    g_pwm_buffer_update_required[index] = false;
}

void aw20216s_flush(void) {
    aw20216s_update_pwm_buffers(AW20216S_CS_PIN_1, 0);
#if defined(AW20216S_CS_PIN_2)
    aw20216s_update_pwm_buffers(AW20216S_CS_PIN_2, 1);
#endif
}