1 /* Copyright 2017 Jason Williams
2 * Copyright 2018 Jack Humbert
4 * This program is free software: you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 #include "is31fl3731.h"
19 #include <avr/interrupt.h>
21 #include <util/delay.h>
23 #include "i2c_master.h"
26 // This is a 7-bit address, that gets left-shifted and bit 0
27 // set to 0 for write, 1 for read (as per I2C protocol)
28 // The address will vary depending on your wiring:
29 // 0b1110100 AD <-> GND
30 // 0b1110111 AD <-> VCC
31 // 0b1110101 AD <-> SCL
32 // 0b1110110 AD <-> SDA
33 #define ISSI_ADDR_DEFAULT 0x74
35 #define ISSI_REG_CONFIG 0x00
36 #define ISSI_REG_CONFIG_PICTUREMODE 0x00
37 #define ISSI_REG_CONFIG_AUTOPLAYMODE 0x08
38 #define ISSI_REG_CONFIG_AUDIOPLAYMODE 0x18
40 #define ISSI_CONF_PICTUREMODE 0x00
41 #define ISSI_CONF_AUTOFRAMEMODE 0x04
42 #define ISSI_CONF_AUDIOMODE 0x08
44 #define ISSI_REG_PICTUREFRAME 0x01
46 #define ISSI_REG_SHUTDOWN 0x0A
47 #define ISSI_REG_AUDIOSYNC 0x06
49 #define ISSI_COMMANDREGISTER 0xFD
50 #define ISSI_BANK_FUNCTIONREG 0x0B // helpfully called 'page nine'
52 // Transfer buffer for TWITransmitData()
53 uint8_t g_twi_transfer_buffer[20];
55 // These buffers match the IS31FL3731 PWM registers 0x24-0xB3.
56 // Storing them like this is optimal for I2C transfers to the registers.
57 // We could optimize this and take out the unused registers from these
58 // buffers and the transfers in IS31FL3731_write_pwm_buffer() but it's
59 // probably not worth the extra complexity.
60 uint8_t g_pwm_buffer[DRIVER_COUNT][144];
61 bool g_pwm_buffer_update_required = false;
63 uint8_t g_led_control_registers[DRIVER_COUNT][18] = { { 0 }, { 0 } };
64 bool g_led_control_registers_update_required = false;
66 // This is the bit pattern in the LED control registers
67 // (for matrix A, add one to register for matrix B)
69 // reg - b7 b6 b5 b4 b3 b2 b1 b0
70 // 0x00 - R08,R07,R06,R05,R04,R03,R02,R01
71 // 0x02 - G08,G07,G06,G05,G04,G03,G02,R00
72 // 0x04 - B08,B07,B06,B05,B04,B03,G01,G00
73 // 0x06 - - , - , - , - , - ,B02,B01,B00
74 // 0x08 - - , - , - , - , - , - , - , -
75 // 0x0A - B17,B16,B15, - , - , - , - , -
76 // 0x0C - G17,G16,B14,B13,B12,B11,B10,B09
77 // 0x0E - R17,G15,G14,G13,G12,G11,G10,G09
78 // 0x10 - R16,R15,R14,R13,R12,R11,R10,R09
81 void IS31FL3731_write_register( uint8_t addr, uint8_t reg, uint8_t data )
83 g_twi_transfer_buffer[0] = reg;
84 g_twi_transfer_buffer[1] = data;
86 //Transmit data until succesful
87 while(i2c_transmit(addr << 1, g_twi_transfer_buffer,2) != 0);
90 void IS31FL3731_write_pwm_buffer( uint8_t addr, uint8_t *pwm_buffer )
92 // assumes bank is already selected
94 // transmit PWM registers in 9 transfers of 16 bytes
95 // g_twi_transfer_buffer[] is 20 bytes
97 // iterate over the pwm_buffer contents at 16 byte intervals
98 for ( int i = 0; i < 144; i += 16 )
100 // set the first register, e.g. 0x24, 0x34, 0x44, etc.
101 g_twi_transfer_buffer[0] = 0x24 + i;
102 // copy the data from i to i+15
103 // device will auto-increment register for data after the first byte
104 // thus this sets registers 0x24-0x33, 0x34-0x43, etc. in one transfer
105 for ( int j = 0; j < 16; j++ )
107 g_twi_transfer_buffer[1 + j] = pwm_buffer[i + j];
110 //Transmit buffer until succesful
111 while(i2c_transmit(addr << 1, g_twi_transfer_buffer,17) != 0);
115 void IS31FL3731_init( uint8_t addr )
117 // In order to avoid the LEDs being driven with garbage data
118 // in the LED driver's PWM registers, first enable software shutdown,
119 // then set up the mode and other settings, clear the PWM registers,
120 // then disable software shutdown.
122 // select "function register" bank
123 IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
125 // enable software shutdown
126 IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x00 );
127 // this delay was copied from other drivers, might not be needed
131 IS31FL3731_write_register( addr, ISSI_REG_CONFIG, ISSI_REG_CONFIG_PICTUREMODE );
133 IS31FL3731_write_register( addr, ISSI_REG_PICTUREFRAME, 0x00 );
135 IS31FL3731_write_register( addr, ISSI_REG_AUDIOSYNC, 0x00 );
138 IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
140 // turn off all LEDs in the LED control register
141 for ( int i = 0x00; i <= 0x11; i++ )
143 IS31FL3731_write_register( addr, i, 0x00 );
146 // turn off all LEDs in the blink control register (not really needed)
147 for ( int i = 0x12; i <= 0x23; i++ )
149 IS31FL3731_write_register( addr, i, 0x00 );
152 // set PWM on all LEDs to 0
153 for ( int i = 0x24; i <= 0xB3; i++ )
155 IS31FL3731_write_register( addr, i, 0x00 );
158 // select "function register" bank
159 IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, ISSI_BANK_FUNCTIONREG );
161 // disable software shutdown
162 IS31FL3731_write_register( addr, ISSI_REG_SHUTDOWN, 0x01 );
164 // select bank 0 and leave it selected.
165 // most usage after initialization is just writing PWM buffers in bank 0
166 // as there's not much point in double-buffering
167 IS31FL3731_write_register( addr, ISSI_COMMANDREGISTER, 0 );
170 void IS31FL3731_set_color( int index, uint8_t red, uint8_t green, uint8_t blue )
172 if ( index >= 0 && index < DRIVER_LED_TOTAL ) {
173 is31_led led = g_is31_leds[index];
175 // Subtract 0x24 to get the second index of g_pwm_buffer
176 g_pwm_buffer[led.driver][led.r - 0x24] = red;
177 g_pwm_buffer[led.driver][led.g - 0x24] = green;
178 g_pwm_buffer[led.driver][led.b - 0x24] = blue;
179 g_pwm_buffer_update_required = true;
183 void IS31FL3731_set_color_all( uint8_t red, uint8_t green, uint8_t blue )
185 for ( int i = 0; i < DRIVER_LED_TOTAL; i++ )
187 IS31FL3731_set_color( i, red, green, blue );
191 void IS31FL3731_set_led_control_register( uint8_t index, bool red, bool green, bool blue )
193 is31_led led = g_is31_leds[index];
195 uint8_t control_register_r = (led.r - 0x24) / 8;
196 uint8_t control_register_g = (led.g - 0x24) / 8;
197 uint8_t control_register_b = (led.b - 0x24) / 8;
198 uint8_t bit_r = (led.r - 0x24) % 8;
199 uint8_t bit_g = (led.g - 0x24) % 8;
200 uint8_t bit_b = (led.b - 0x24) % 8;
203 g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r);
205 g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r);
208 g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g);
210 g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g);
213 g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b);
215 g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b);
218 g_led_control_registers_update_required = true;
223 void IS31FL3731_update_pwm_buffers( uint8_t addr1, uint8_t addr2 )
225 if ( g_pwm_buffer_update_required )
227 IS31FL3731_write_pwm_buffer( addr1, g_pwm_buffer[0] );
228 IS31FL3731_write_pwm_buffer( addr2, g_pwm_buffer[1] );
230 g_pwm_buffer_update_required = false;
233 void IS31FL3731_update_led_control_registers( uint8_t addr1, uint8_t addr2 )
235 if ( g_led_control_registers_update_required )
237 for ( int i=0; i<18; i++ )
239 IS31FL3731_write_register(addr1, i, g_led_control_registers[0][i] );
240 IS31FL3731_write_register(addr2, i, g_led_control_registers[1][i] );