1 /* Copyright 2018 Jason Williams (Wilba)
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.
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.
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/>.
18 # include <avr/interrupt.h>
20 # include <util/delay.h>
25 #include "is31fl3736.h"
27 #include "i2c_master.h"
30 // This is a 7-bit address, that gets left-shifted and bit 0
31 // set to 0 for write, 1 for read (as per I2C protocol)
32 // The address will vary depending on your wiring:
37 // ADDR1 represents A1:A0 of the 7-bit address.
38 // ADDR2 represents A3:A2 of the 7-bit address.
39 // The result is: 0b101(ADDR2)(ADDR1)
40 #define ISSI_ADDR_DEFAULT 0x50
42 #define ISSI_COMMANDREGISTER 0xFD
43 #define ISSI_COMMANDREGISTER_WRITELOCK 0xFE
44 #define ISSI_INTERRUPTMASKREGISTER 0xF0
45 #define ISSI_INTERRUPTSTATUSREGISTER 0xF1
47 #define ISSI_PAGE_LEDCONTROL 0x00 // PG0
48 #define ISSI_PAGE_PWM 0x01 // PG1
49 #define ISSI_PAGE_AUTOBREATH 0x02 // PG2
50 #define ISSI_PAGE_FUNCTION 0x03 // PG3
52 #define ISSI_REG_CONFIGURATION 0x00 // PG3
53 #define ISSI_REG_GLOBALCURRENT 0x01 // PG3
54 #define ISSI_REG_RESET 0x11 // PG3
55 #define ISSI_REG_SWPULLUP 0x0F // PG3
56 #define ISSI_REG_CSPULLUP 0x10 // PG3
59 # define ISSI_TIMEOUT 100
62 #ifndef ISSI_PERSISTENCE
63 # define ISSI_PERSISTENCE 0
66 // Transfer buffer for TWITransmitData()
67 uint8_t g_twi_transfer_buffer[20];
69 // These buffers match the IS31FL3736 PWM registers.
70 // The control buffers match the PG0 LED On/Off registers.
71 // Storing them like this is optimal for I2C transfers to the registers.
72 // We could optimize this and take out the unused registers from these
73 // buffers and the transfers in IS31FL3736_write_pwm_buffer() but it's
74 // probably not worth the extra complexity.
75 uint8_t g_pwm_buffer[DRIVER_COUNT][192];
76 bool g_pwm_buffer_update_required = false;
78 uint8_t g_led_control_registers[DRIVER_COUNT][24] = {{0}, {0}};
79 bool g_led_control_registers_update_required = false;
81 void IS31FL3736_write_register(uint8_t addr, uint8_t reg, uint8_t data) {
82 g_twi_transfer_buffer[0] = reg;
83 g_twi_transfer_buffer[1] = data;
85 #if ISSI_PERSISTENCE > 0
86 for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
87 if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT) == 0) break;
90 i2c_transmit(addr << 1, g_twi_transfer_buffer, 2, ISSI_TIMEOUT);
94 void IS31FL3736_write_pwm_buffer(uint8_t addr, uint8_t *pwm_buffer) {
95 // assumes PG1 is already selected
97 // transmit PWM registers in 12 transfers of 16 bytes
98 // g_twi_transfer_buffer[] is 20 bytes
100 // iterate over the pwm_buffer contents at 16 byte intervals
101 for (int i = 0; i < 192; i += 16) {
102 g_twi_transfer_buffer[0] = i;
103 // copy the data from i to i+15
104 // device will auto-increment register for data after the first byte
105 // thus this sets registers 0x00-0x0F, 0x10-0x1F, etc. in one transfer
106 for (int j = 0; j < 16; j++) {
107 g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
110 #if ISSI_PERSISTENCE > 0
111 for (uint8_t i = 0; i < ISSI_PERSISTENCE; i++) {
112 if (i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT) == 0) break;
115 i2c_transmit(addr << 1, g_twi_transfer_buffer, 17, ISSI_TIMEOUT);
120 void IS31FL3736_init(uint8_t addr) {
121 // In order to avoid the LEDs being driven with garbage data
122 // in the LED driver's PWM registers, shutdown is enabled last.
123 // Set up the mode and other settings, clear the PWM registers,
124 // then disable software shutdown.
126 // Unlock the command register.
127 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
130 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
131 // Turn off all LEDs.
132 for (int i = 0x00; i <= 0x17; i++) {
133 IS31FL3736_write_register(addr, i, 0x00);
136 // Unlock the command register.
137 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
140 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
141 // Set PWM on all LEDs to 0
142 // No need to setup Breath registers to PWM as that is the default.
143 for (int i = 0x00; i <= 0xBF; i++) {
144 IS31FL3736_write_register(addr, i, 0x00);
147 // Unlock the command register.
148 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
151 IS31FL3736_write_register(addr, ISSI_COMMANDREGISTER, ISSI_PAGE_FUNCTION);
152 // Set global current to maximum.
153 IS31FL3736_write_register(addr, ISSI_REG_GLOBALCURRENT, 0xFF);
154 // Disable software shutdown.
155 IS31FL3736_write_register(addr, ISSI_REG_CONFIGURATION, 0x01);
157 // Wait 10ms to ensure the device has woken up.
165 void IS31FL3736_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
166 if (index >= 0 && index < DRIVER_LED_TOTAL) {
167 is31_led led = g_is31_leds[index];
169 g_pwm_buffer[led.driver][led.r] = red;
170 g_pwm_buffer[led.driver][led.g] = green;
171 g_pwm_buffer[led.driver][led.b] = blue;
172 g_pwm_buffer_update_required = true;
176 void IS31FL3736_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
177 for (int i = 0; i < DRIVER_LED_TOTAL; i++) {
178 IS31FL3736_set_color(i, red, green, blue);
182 void IS31FL3736_set_led_control_register(uint8_t index, bool red, bool green, bool blue) {
183 is31_led led = g_is31_leds[index];
186 // The PWM register for a matrix position (0x00 to 0xBF) can be
187 // divided by 8 to get the LED control register (0x00 to 0x17),
188 // then mod 8 to get the bit position within that register.
191 // The PWM register for a matrix position (0x00 to 0xBF) is interleaved, so:
192 // A1=0x00 A2=0x02 A3=0x04 A4=0x06 A5=0x08 A6=0x0A A7=0x0C A8=0x0E
193 // B1=0x10 B2=0x12 B3=0x14
194 // But also, the LED control registers (0x00 to 0x17) are also interleaved, so:
195 // A1-A4=0x00 A5-A8=0x01
196 // So, the same math applies.
198 uint8_t control_register_r = led.r / 8;
199 uint8_t control_register_g = led.g / 8;
200 uint8_t control_register_b = led.b / 8;
202 uint8_t bit_r = led.r % 8;
203 uint8_t bit_g = led.g % 8;
204 uint8_t bit_b = led.b % 8;
207 g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
209 g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
212 g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
214 g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
217 g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
219 g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
222 g_led_control_registers_update_required = true;
225 void IS31FL3736_mono_set_brightness(int index, uint8_t value) {
226 if (index >= 0 && index < 96) {
227 // Index in range 0..95 -> A1..A8, B1..B8, etc.
228 // Map index 0..95 to registers 0x00..0xBE (interleaved)
229 uint8_t pwm_register = index * 2;
230 g_pwm_buffer[0][pwm_register] = value;
231 g_pwm_buffer_update_required = true;
235 void IS31FL3736_mono_set_brightness_all(uint8_t value) {
236 for (int i = 0; i < 96; i++) {
237 IS31FL3736_mono_set_brightness(i, value);
241 void IS31FL3736_mono_set_led_control_register(uint8_t index, bool enabled) {
242 // Index in range 0..95 -> A1..A8, B1..B8, etc.
244 // Map index 0..95 to registers 0x00..0xBE (interleaved)
245 uint8_t pwm_register = index * 2;
246 // Map register 0x00..0xBE (interleaved) into control register and bit
247 uint8_t control_register = pwm_register / 8;
248 uint8_t bit = pwm_register % 8;
251 g_led_control_registers[0][control_register] |= (1 << bit);
253 g_led_control_registers[0][control_register] &= ~(1 << bit);
256 g_led_control_registers_update_required = true;
259 void IS31FL3736_update_pwm_buffers(uint8_t addr1, uint8_t addr2) {
260 if (g_pwm_buffer_update_required) {
261 // Firstly we need to unlock the command register and select PG1
262 IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
263 IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_PWM);
265 IS31FL3736_write_pwm_buffer(addr1, g_pwm_buffer[0]);
266 // IS31FL3736_write_pwm_buffer( addr2, g_pwm_buffer[1] );
268 g_pwm_buffer_update_required = false;
271 void IS31FL3736_update_led_control_registers(uint8_t addr1, uint8_t addr2) {
272 if (g_led_control_registers_update_required) {
273 // Firstly we need to unlock the command register and select PG0
274 IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER_WRITELOCK, 0xC5);
275 IS31FL3736_write_register(addr1, ISSI_COMMANDREGISTER, ISSI_PAGE_LEDCONTROL);
276 for (int i = 0; i < 24; i++) {
277 IS31FL3736_write_register(addr1, i, g_led_control_registers[0][i]);
278 // IS31FL3736_write_register(addr2, i, g_led_control_registers[1][i] );