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-rw-r--r--drivers/led/aw20216.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/led/aw20216.c b/drivers/led/aw20216.c
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1/* Copyright 2021 Jasper Chan
2 *
3 * This program is free software: you can redistribute it and/or modify
4 * it under the terms of the GNU General Public License as published by
5 * the Free Software Foundation, either version 2 of the License, or
6 * (at your option) any later version.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program. If not, see <http://www.gnu.org/licenses/>.
15 */
16
17#include "aw20216.h"
18#include "spi_master.h"
19
20/* The AW20216 appears to be somewhat similar to the IS31FL743, although quite
21 * a few things are different, such as the command byte format and page ordering.
22 * The LED addresses start from 0x00 instead of 0x01.
23 */
24#define AWINIC_ID 0b1010 << 4
25
26#define AW_PAGE_FUNCTION 0x00 << 1 // PG0, Function registers
27#define AW_PAGE_PWM 0x01 << 1 // PG1, LED PWM control
28#define AW_PAGE_SCALING 0x02 << 1 // PG2, LED current scaling control
29#define AW_PAGE_PATCHOICE 0x03 << 1 // PG3, Pattern choice?
30#define AW_PAGE_PWMSCALING 0x04 << 1 // PG4, LED PWM + Scaling control?
31
32#define AW_WRITE 0
33#define AW_READ 1
34
35#define AW_REG_CONFIGURATION 0x00 // PG0
36#define AW_REG_GLOBALCURRENT 0x01 // PG0
37
38// Default value of AW_REG_CONFIGURATION
39// D7:D4 = 1011, SWSEL (SW1~SW12 active)
40// D3 = 0?, reserved (apparently this should be 1 but it doesn't seem to matter)
41// D2:D1 = 00, OSDE (open/short detection enable)
42// D0 = 0, CHIPEN (write 1 to enable LEDs when hardware enable pulled high)
43#define AW_CONFIG_DEFAULT 0b10110000
44#define AW_CHIPEN 1
45
46#define AW_PWM_REGISTER_COUNT 216
47
48#ifndef AW_SCALING_MAX
49# define AW_SCALING_MAX 150
50#endif
51
52#ifndef AW_GLOBAL_CURRENT_MAX
53# define AW_GLOBAL_CURRENT_MAX 150
54#endif
55
56#ifndef AW_SPI_DIVISOR
57# define AW_SPI_DIVISOR 4
58#endif
59
60uint8_t g_pwm_buffer[DRIVER_COUNT][AW_PWM_REGISTER_COUNT];
61bool g_pwm_buffer_update_required[DRIVER_COUNT] = {false};
62
63bool AW20216_write(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t* data, uint8_t len) {
64 static uint8_t s_spi_transfer_buffer[2] = {0};
65
66 if (!spi_start(cs_pin, false, 0, AW_SPI_DIVISOR)) {
67 spi_stop();
68 return false;
69 }
70
71 s_spi_transfer_buffer[0] = (AWINIC_ID | page | AW_WRITE);
72 s_spi_transfer_buffer[1] = reg;
73
74 if (spi_transmit(s_spi_transfer_buffer, 2) != SPI_STATUS_SUCCESS) {
75 spi_stop();
76 return false;
77 }
78
79 if (spi_transmit(data, len) != SPI_STATUS_SUCCESS) {
80 spi_stop();
81 return false;
82 }
83
84 spi_stop();
85 return true;
86}
87
88static inline bool AW20216_write_register(pin_t cs_pin, uint8_t page, uint8_t reg, uint8_t value) {
89 // Little wrapper so callers need not care about sending a buffer
90 return AW20216_write(cs_pin, page, reg, &value, 1);
91}
92
93static void AW20216_init_scaling(pin_t cs_pin) {
94 // Set constant current to the max, control brightness with PWM
95 for (uint8_t i = 0; i < AW_PWM_REGISTER_COUNT; i++) {
96 AW20216_write_register(cs_pin, AW_PAGE_SCALING, i, AW_SCALING_MAX);
97 }
98}
99
100static inline void AW20216_init_current_limit(pin_t cs_pin) {
101 // Push config
102 AW20216_write_register(cs_pin, AW_PAGE_FUNCTION, AW_REG_GLOBALCURRENT, AW_GLOBAL_CURRENT_MAX);
103}
104
105static inline void AW20216_soft_enable(pin_t cs_pin) {
106 // Push config
107 AW20216_write_register(cs_pin, AW_PAGE_FUNCTION, AW_REG_CONFIGURATION, AW_CONFIG_DEFAULT | AW_CHIPEN);
108}
109
110void AW20216_init(pin_t cs_pin, pin_t en_pin) {
111 setPinOutput(en_pin);
112 writePinHigh(en_pin);
113
114 // Drivers should start with all scaling and PWM registers as off
115 AW20216_init_current_limit(cs_pin);
116 AW20216_init_scaling(cs_pin);
117
118 AW20216_soft_enable(cs_pin);
119}
120
121void AW20216_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
122 aw_led led = g_aw_leds[index];
123
124 g_pwm_buffer[led.driver][led.r] = red;
125 g_pwm_buffer[led.driver][led.g] = green;
126 g_pwm_buffer[led.driver][led.b] = blue;
127 g_pwm_buffer_update_required[led.driver] = true;
128}
129
130void AW20216_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
131 for (uint8_t i = 0; i < DRIVER_LED_TOTAL; i++) {
132 AW20216_set_color(i, red, green, blue);
133 }
134}
135
136void AW20216_update_pwm_buffers(pin_t cs_pin, uint8_t index) {
137 if (g_pwm_buffer_update_required[index]) {
138 AW20216_write(cs_pin, AW_PAGE_PWM, 0, g_pwm_buffer[index], AW_PWM_REGISTER_COUNT);
139 }
140 g_pwm_buffer_update_required[index] = false;
141}