summaryrefslogtreecommitdiffstats
path: root/drivers/issi/is31fl3731-simple.c
blob: cffb4d87ffc637a9e11b79711949e6d8c1b61212 (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
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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
/* Copyright 2017 Jason Williams
 * Copyright 2018 Jack Humbert
 * Copyright 2019 Clueboard
 *
 * 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 "is31fl3731-simple.h"
#include "i2c_master.h"
#include "wait.h"

// This is a 7-bit address, that gets left-shifted and bit 0
// set to 0 for write, 1 for read (as per I2C protocol)
// The address will vary depending on your wiring:
// 0b1110100 AD <-> GND
// 0b1110111 AD <-> VCC
// 0b1110101 AD <-> SCL
// 0b1110110 AD <-> SDA
#define ISSI_ADDR_DEFAULT 0x74

#define ISSI_REG_CONFIG 0x00
#define ISSI_REG_CONFIG_PICTUREMODE 0x00
#define ISSI_REG_CONFIG_AUTOPLAYMODE 0x08
#define ISSI_REG_CONFIG_AUDIOPLAYMODE 0x18

#define ISSI_CONF_PICTUREMODE 0x00
#define ISSI_CONF_AUTOFRAMEMODE 0x04
#define ISSI_CONF_AUDIOMODE 0x08

#define ISSI_REG_PICTUREFRAME 0x01

#define ISSI_REG_SHUTDOWN 0x0A
#define ISSI_REG_AUDIOSYNC 0x06

#define ISSI_COMMANDREGISTER 0xFD
#define ISSI_BANK_FUNCTIONREG 0x0B  // helpfully called 'page nine'

#ifndef ISSI_TIMEOUT
#    define ISSI_TIMEOUT 100
#endif

#ifndef ISSI_PERSISTENCE
#    define ISSI_PERSISTENCE 0
#endif

// Transfer buffer for TWITransmitData()
uint8_t g_twi_transfer_buffer[20];

// These buffers match the IS31FL3731 PWM registers 0x24-0xB3.
// Storing them like this is optimal for I2C transfers to the registers.
// We could optimize this and take out the unused registers from these
// buffers and the transfers in IS31FL3731_write_pwm_buffer() but it's
// probably not worth the extra complexity.
uint8_t g_pwm_buffer[LED_DRIVER_COUNT][144];
bool    g_pwm_buffer_update_required[LED_DRIVER_COUNT] = {false};

/* There's probably a better way to init this... */
#if LED_DRIVER_COUNT == 1
uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}};
#elif LED_DRIVER_COUNT == 2
uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}};
#elif LED_DRIVER_COUNT == 3
uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}, {0}};
#elif LED_DRIVER_COUNT == 4
uint8_t g_led_control_registers[LED_DRIVER_COUNT][18] = {{0}, {0}, {0}, {0}};
#endif
bool    g_led_control_registers_update_required[LED_DRIVER_COUNT] = {false};

// This is the bit pattern in the LED control registers
// (for matrix A, add one to register for matrix B)
//
//  reg -  b7  b6  b5  b4  b3  b2  b1  b0
// 0x00 - R08,R07,R06,R05,R04,R03,R02,R01
// 0x02 - G08,G07,G06,G05,G04,G03,G02,R00
// 0x04 - B08,B07,B06,B05,B04,B03,G01,G00
// 0x06 -  - , - , - , - , - ,B02,B01,B00
// 0x08 -  - , - , - , - , - , - , - , -
// 0x0A - B17,B16,B15, - , - , - , - , -
// 0x0C - G17,G16,B14,B13,B12,B11,B10,B09
// 0x0E - R17,G15,G14,G13,G12,G11,G10,G09
// 0x10 - R16,R15,R14,R13,R12,R11,R10,R09

void IS31FL3731_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
    g_twi_transfer_buffer[0] = reg;
    g_twi_transfer_buffer[1] = data;

#if ISSI_PERSISTENCE > 0
    for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
        if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) {
            break;
        }
    }
#else
    i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
#endif
}

void IS31FL3731_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
    // assumes bank is already selected

    // transmit PWM registers in 9 transfers of 16 bytes
    // g_twi_transfer_buffer[] is 20 bytes

    // iterate over the pwm_buffer contents at 16 byte intervals
    for (int i = 0; i < 144; i += 16) {
        // set the first register, e.g. 0x24, 0x34, 0x44, etc.
        g_twi_transfer_buffer[0] = 0x24 + i;
        // copy the data from i to i+15
        // device will auto-increment register for data after the first byte
        // thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer
        for (int j = 0; j < 16; j++) {
            g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
        }

#if ISSI_PERSISTENCE > 0
        for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
            if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
        }
#else
        i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
#endif
    }
}

void IS31FL3731_init(uint8_t addr) {
    // In order to avoid the LEDs being driven with garbage data
    // in the LED driver's PWM registers, first enable software shutdown,
    // then set up the mode and other settings, clear the PWM registers,
    // then disable software shutdown.

    // select "function register" bank
    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);

    // enable software shutdown
    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x00);

    // this delay was copied from other drivers, might not be needed
    wait_ms(10);

    // picture mode
    IS31FL3731_write_register(addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE);
    // display frame 0
    IS31FL3731_write_register(addr, ISSI_REG_PICTUREFRAME, 0x00);
    // audio sync off
    IS31FL3731_write_register(addr, ISSI_REG_AUDIOSYNC, 0x00);

    // select bank 0
    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);

    // turn off all LEDs in the LED control register
    for (int i = 0x00; i <= 0x11; i++) {
        IS31FL3731_write_register(addr, i, 0x00);
    }

    // turn off all LEDs in the blink control register (not really needed)
    for (int i = 0x12; i <= 0x23; i++) {
        IS31FL3731_write_register(addr, i, 0x00);
    }

    // set PWM on all LEDs to 0
    for (int i = 0x24; i <= 0xB3; i++) {
        IS31FL3731_write_register(addr, i, 0x00);
    }

    // select "function register" bank
    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG);

    // disable software shutdown
    IS31FL3731_write_register(addr, ISSI_REG_SHUTDOWN, 0x01);

    // select bank 0 and leave it selected.
    // most usage after initialization is just writing PWM buffers in bank 0
    // as there's not much point in double-buffering
    IS31FL3731_write_register(addr, ISSI_COMMANDREGISTER, 0);
}

void IS31FL3731_set_value(int index, uint8_t value) {
    if (index >= 0 && index < LED_DRIVER_LED_COUNT) {
        is31_led led = g_is31_leds[index];

        // Subtract 0x24 to get the second index of g_pwm_buffer
        g_pwm_buffer[led.driver][led.v - 0x24]   = value;
        g_pwm_buffer_update_required[led.driver] = true;
    }
}

void IS31FL3731_set_value_all(uint8_t value) {
    for (int i = 0; i < LED_DRIVER_LED_COUNT; i++) {
        IS31FL3731_set_value(i, value);
    }
}

void IS31FL3731_set_led_control_register(uint8_t index, bool value) {
    is31_led led = g_is31_leds[index];

    uint8_t control_register = (led.v - 0x24) / 8;
    uint8_t bit_value        = (led.v - 0x24) % 8;

    if (value) {
        g_led_control_registers[led.driver][control_register] |= (1 << bit_value);
    } else {
        g_led_control_registers[led.driver][control_register] &= ~(1 << bit_value);
    }

    g_led_control_registers_update_required[led.driver] = true;
}

void IS31FL3731_update_pwm_buffers(uint8_t addr, uint8_t index) {
    if (g_pwm_buffer_update_required[index]) {
        IS31FL3731_write_pwm_buffer(addr, g_pwm_buffer[index]);
        g_pwm_buffer_update_required[index] = false;
    }
}

void IS31FL3731_update_led_control_registers(uint8_t addr, uint8_t index) {
    if (g_led_control_registers_update_required[index]) {
        for (int i = 0; i < 18; i++) {
            IS31FL3731_write_register(addr, i, g_led_control_registers[index][i]);
        }
        g_led_control_registers_update_required[index] = false;
    }
}