97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/* Copyright 2018 Jason Williams (Wilba)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "is31fl3218.h"
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#include "i2c_master.h"
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// This is the full 8-bit address
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#define IS31FL3218_I2C_ADDRESS 0xA8
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// These are the register addresses
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#define IS31FL3218_REG_SHUTDOWN 0x00
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#define IS31FL3218_REG_PWM 0x01
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#define IS31FL3218_REG_CONTROL 0x13
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#define IS31FL3218_REG_UPDATE 0x16
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#define IS31FL3218_REG_RESET 0x17
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// Default timeout if no I2C response
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#define IS31FL3218_I2C_TIMEOUT 100
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// Reusable buffer for transfers
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uint8_t g_twi_transfer_buffer[20];
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// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
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// If used as RGB LED driver, LEDs are assigned RGB,RGB,RGB,RGB,RGB,RGB
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uint8_t g_pwm_buffer[18];
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bool g_pwm_buffer_update_required = false;
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void is31fl3218_write_register(uint8_t reg, uint8_t data) {
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g_twi_transfer_buffer[0] = reg;
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g_twi_transfer_buffer[1] = data;
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i2c_transmit(IS31FL3218_I2C_ADDRESS, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT);
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}
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void is31fl3218_write_pwm_buffer(uint8_t *pwm_buffer) {
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g_twi_transfer_buffer[0] = IS31FL3218_REG_PWM;
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memcpy(g_twi_transfer_buffer + 1, pwm_buffer, 18);
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i2c_transmit(IS31FL3218_I2C_ADDRESS, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
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}
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void is31fl3218_init(void) {
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// In case we ever want to reinitialize (?)
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is31fl3218_write_register(IS31FL3218_REG_RESET, 0x00);
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// Turn off software shutdown
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is31fl3218_write_register(IS31FL3218_REG_SHUTDOWN, 0x01);
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// Set all PWM values to zero
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for (uint8_t i = 0; i < 18; i++) {
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is31fl3218_write_register(IS31FL3218_REG_PWM + i, 0x00);
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}
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// Enable all channels
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for (uint8_t i = 0; i < 3; i++) {
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is31fl3218_write_register(IS31FL3218_REG_CONTROL + i, 0b00111111);
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}
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// Load PWM registers and LED Control register data
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is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
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}
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void is31fl3218_set_color(int index, uint8_t red, uint8_t green, uint8_t blue) {
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if (g_pwm_buffer[index * 3 + 0] == red && g_pwm_buffer[index * 3 + 1] == green && g_pwm_buffer[index * 3 + 2] == blue) {
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return;
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}
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g_pwm_buffer[index * 3 + 0] = red;
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g_pwm_buffer[index * 3 + 1] = green;
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g_pwm_buffer[index * 3 + 2] = blue;
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g_pwm_buffer_update_required = true;
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}
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void is31fl3218_set_color_all(uint8_t red, uint8_t green, uint8_t blue) {
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for (int i = 0; i < 6; i++) {
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is31fl3218_set_color(i, red, green, blue);
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}
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}
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void is31fl3218_update_pwm_buffers(void) {
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if (g_pwm_buffer_update_required) {
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is31fl3218_write_pwm_buffer(g_pwm_buffer);
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// Load PWM registers and LED Control register data
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is31fl3218_write_register(IS31FL3218_REG_UPDATE, 0x01);
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}
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g_pwm_buffer_update_required = false;
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}
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