diff options
Diffstat (limited to 'drivers/led/aw20216.c')
-rw-r--r-- | drivers/led/aw20216.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/drivers/led/aw20216.c b/drivers/led/aw20216.c new file mode 100644 index 000000000..c608c0ab4 --- /dev/null +++ b/drivers/led/aw20216.c | |||
@@ -0,0 +1,141 @@ | |||
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 | |||
60 | uint8_t g_pwm_buffer[DRIVER_COUNT][AW_PWM_REGISTER_COUNT]; | ||
61 | bool g_pwm_buffer_update_required[DRIVER_COUNT] = {false}; | ||
62 | |||
63 | bool 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 | |||
88 | static 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 | |||
93 | static 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 | |||
100 | static 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 | |||
105 | static 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 | |||
110 | void 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 | |||
121 | void 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 | |||
130 | void 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 | |||
136 | void 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 | } | ||