diff options
Diffstat (limited to 'drivers/led/issi/is31fl3731.c')
| -rw-r--r-- | drivers/led/issi/is31fl3731.c | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/drivers/led/issi/is31fl3731.c b/drivers/led/issi/is31fl3731.c new file mode 100644 index 0000000000..110bdc1be4 --- /dev/null +++ b/drivers/led/issi/is31fl3731.c @@ -0,0 +1,237 @@ +/* Copyright 2017 Jason Williams + * Copyright 2018 Jack Humbert + * + * 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.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[DRIVER_COUNT][144]; +bool g_pwm_buffer_update_required[DRIVER_COUNT] = {false}; + +uint8_t g_led_control_registers[DRIVER_COUNT][18] = {{0}}; +bool g_led_control_registers_update_required[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_color(int index, uint8_t red, uint8_t green, uint8_t blue) { + if (index >= 0 && index < DRIVER_LED_TOTAL) { + is31_led led = g_is31_leds[index]; + + // Subtract 0x24 to get the second index of g_pwm_buffer + g_pwm_buffer[led.driver][led.r - 0x24] = red; + g_pwm_buffer[led.driver][led.g - 0x24] = green; + g_pwm_buffer[led.driver][led.b - 0x24] = blue; + g_pwm_buffer_update_required[led.driver] = true; + } +} + +void IS31FL3731_set_color_all(uint8_t red, uint8_t green, uint8_t blue) { + for (int i = 0; i < DRIVER_LED_TOTAL; i++) { + IS31FL3731_set_color(i, red, green, blue); + } +} + +void IS31FL3731_set_led_control_register(uint8_t index, bool red, bool green, bool blue) { + is31_led led = g_is31_leds[index]; + + uint8_t control_register_r = (led.r - 0x24) / 8; + uint8_t control_register_g = (led.g - 0x24) / 8; + uint8_t control_register_b = (led.b - 0x24) / 8; + uint8_t bit_r = (led.r - 0x24) % 8; + uint8_t bit_g = (led.g - 0x24) % 8; + uint8_t bit_b = (led.b - 0x24) % 8; + + if (red) { + g_led_control_registers[led.driver][control_register_r] |= (1 << bit_r); + } else { + g_led_control_registers[led.driver][control_register_r] &= ~(1 << bit_r); + } + if (green) { + g_led_control_registers[led.driver][control_register_g] |= (1 << bit_g); + } else { + g_led_control_registers[led.driver][control_register_g] &= ~(1 << bit_g); + } + if (blue) { + g_led_control_registers[led.driver][control_register_b] |= (1 << bit_b); + } else { + g_led_control_registers[led.driver][control_register_b] &= ~(1 << bit_b); + } + + 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; +} |