/* Copyright 2018 Jason Williams (Wilba) * * 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 "is31fl3218.h" #include "i2c_master.h" // This is the full 8-bit address #define ISSI_ADDRESS 0b10101000 // These are the register addresses #define ISSI_REG_SHUTDOWN 0x00 #define ISSI_REG_PWM 0x01 #define ISSI_REG_CONTROL 0x13 #define ISSI_REG_UPDATE 0x16 #define ISSI_REG_RESET 0x17 // Default timeout if no I2C response #define ISSI_TIMEOUT 100 // Reusable buffer for transfers uint8_t g_twi_transfer_buffer[20]; // IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining. // If used as RGB LED driver, LEDs are assigned RGB,RGB,RGB,RGB,RGB,RGB uint8_t g_pwm_buffer[18]; bool g_pwm_buffer_update_required = false; void IS31FL3218_write_register(uint8_t reg, uint8_t data) { g_twi_transfer_buffer[0] = reg; g_twi_transfer_buffer[1] = data; i2c_transmit(ISSI_ADDRESS, g_twi_transfer_buffer, 2, ISSI_TIMEOUT); } void IS31FL3218_write_pwm_buffer(uint8_t *pwm_buffer) { g_twi_transfer_buffer[0] = ISSI_REG_PWM; for (int i = 0; i < 18; i++) { g_twi_transfer_buffer[1 + i] = pwm_buffer[i]; } i2c_transmit(ISSI_ADDRESS, g_twi_transfer_buffer, 19, ISSI_TIMEOUT); } void IS31FL3218_init(void) { // In case we ever want to reinitialize (?) IS31FL3218_write_register(ISSI_REG_RESET, 0x00); // Turn off software shutdown IS31FL3218_write_register(ISSI_REG_SHUTDOWN, 0x01); // Set all PWM values to zero for (uint8_t i = 0; i < 18; i++) { IS31FL3218_write_register(ISSI_REG_PWM + i, 0x00); } // Enable all channels for (uint8_t i = 0; i < 3; i++) { IS31FL3218_write_register(ISSI_REG_CONTROL + i, 0b00111111); } // Load PWM registers and LED Control register data IS31FL3218_write_register(ISSI_REG_UPDATE, 0x01); } void IS31FL3218_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) { g_pwm_buffer[index * 3 + 0] = red; g_pwm_buffer[index * 3 + 1] = green; g_pwm_buffer[index * 3 + 2] = blue; g_pwm_buffer_update_required = true; } void IS31FL3218_set_color_all(uint8_t red, uint8_t green, uint8_t blue) { for (int i = 0; i < 6; i++) { IS31FL3218_set_color(i, red, green, blue); } } void IS31FL3218_update_pwm_buffers(void) { if (g_pwm_buffer_update_required) { IS31FL3218_write_pwm_buffer(g_pwm_buffer); // Load PWM registers and LED Control register data IS31FL3218_write_register(ISSI_REG_UPDATE, 0x01); } g_pwm_buffer_update_required = false; }