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+/* 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 <string.h>
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+#include "i2c_master.h"
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+
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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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+
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+#ifndef IS31FL3218_I2C_TIMEOUT
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+# define IS31FL3218_I2C_TIMEOUT 100
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+#endif
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+
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+#ifndef IS31FL3218_I2C_PERSISTENCE
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+# define IS31FL3218_I2C_PERSISTENCE 0
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+#endif
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+
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+// Reusable buffer for transfers
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+uint8_t g_twi_transfer_buffer[20];
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+
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+// IS31FL3218 has 18 PWM outputs and a fixed I2C address, so no chaining.
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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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+
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+uint8_t g_led_control_registers[3] = {0};
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+bool g_led_control_registers_update_required = false;
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+
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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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+#if IS31FL3218_I2C_PERSISTENCE > 0
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+ for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
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+ if (i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT) == 0) break;
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+ }
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+#else
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+ i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 2, IS31FL3218_I2C_TIMEOUT);
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+#endif
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+}
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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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+
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+#if IS31FL3218_I2C_PERSISTENCE > 0
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+ for (uint8_t i = 0; i < IS31FL3218_I2C_PERSISTENCE; i++) {
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+ i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
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+ }
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+#else
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+ i2c_transmit(IS31FL3218_I2C_ADDRESS << 1, g_twi_transfer_buffer, 19, IS31FL3218_I2C_TIMEOUT);
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+#endif
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+}
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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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+
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+ // Turn off software shutdown
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+ is31fl3218_write_register(IS31FL3218_REG_SHUTDOWN, 0x01);
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+
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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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+
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+ // turn off all LEDs in the LED control register
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+ for (uint8_t i = 0; i < 3; i++) {
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+ is31fl3218_write_register(IS31FL3218_REG_CONTROL + i, 0x00);
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+ }
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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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+
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+void is31fl3218_set_value(int index, uint8_t value) {
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+ is31fl3218_led_t led;
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+ if (index >= 0 && index < LED_MATRIX_LED_COUNT) {
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+ memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
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+ }
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+ if (g_pwm_buffer[led.v - IS31FL3218_REG_PWM] == value) {
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+ return;
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+ }
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+ g_pwm_buffer[led.v - IS31FL3218_REG_PWM] = value;
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+ g_pwm_buffer_update_required = true;
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+}
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+
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+void is31fl3218_set_value_all(uint8_t value) {
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+ for (int i = 0; i < LED_MATRIX_LED_COUNT; i++) {
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+ is31fl3218_set_value(i, value);
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+ }
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+}
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+
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+void is31fl3218_set_led_control_register(uint8_t index, bool value) {
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+ is31fl3218_led_t led;
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+ memcpy_P(&led, (&g_is31fl3218_leds[index]), sizeof(led));
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+
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+ uint8_t control_register = (led.v - IS31FL3218_REG_PWM) / 6;
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+ uint8_t bit_value = (led.v - IS31FL3218_REG_PWM) % 6;
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+
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+ if (value) {
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+ g_led_control_registers[control_register] |= (1 << bit_value);
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+ } else {
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+ g_led_control_registers[control_register] &= ~(1 << bit_value);
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+ }
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+
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+ g_led_control_registers_update_required = true;
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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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+}
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+
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+void is31fl3218_update_led_control_registers(void) {
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+ if (g_led_control_registers_update_required) {
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+ for (int i = 0; i < 3; i++) {
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+ is31fl3218_write_register(IS31FL3218_REG_CONTROL + i, g_led_control_registers[i]);
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+ }
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+
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+ g_led_control_registers_update_required = false;
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+ }
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+}
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