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- /*
- * Marlin 3D Printer Firmware
- * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
- *
- * Based on Sprinter and grbl.
- * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
- *
- * 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 3 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 <https://www.gnu.org/licenses/>.
- *
- */
-
- /**
- * PCA9533 LED controller driver (MightyBoard, FlashForge Creator Pro, etc.)
- * by @grauerfuchs - 1 Apr 2020
- */
- #include "../../inc/MarlinConfig.h"
-
- #if ENABLED(PCA9533)
-
- #include "pca9533.h"
- #include <Wire.h>
-
- void PCA9533_init() {
- Wire.begin();
- PCA9533_reset();
- }
-
- static void PCA9533_writeAllRegisters(uint8_t psc0, uint8_t pwm0, uint8_t psc1, uint8_t pwm1, uint8_t ls0) {
- uint8_t data[6] = { PCA9533_REG_PSC0 | PCA9533_REGM_AI, psc0, pwm0, psc1, pwm1, ls0 };
- Wire.beginTransmission(PCA9533_Addr >> 1);
- Wire.write(data, 6);
- Wire.endTransmission();
- delayMicroseconds(1);
- }
-
- static void PCA9533_writeRegister(uint8_t reg, uint8_t val) {
- uint8_t data[2] = { reg, val };
- Wire.beginTransmission(PCA9533_Addr >> 1);
- Wire.write(data, 2);
- Wire.endTransmission();
- delayMicroseconds(1);
- }
-
- // Reset (clear) all registers
- void PCA9533_reset() {
- PCA9533_writeAllRegisters(0, 0, 0, 0, 0);
- }
-
- // Turn all LEDs off
- void PCA9533_setOff() {
- PCA9533_writeRegister(PCA9533_REG_SEL, 0);
- }
-
- void PCA9533_set_rgb(uint8_t red, uint8_t green, uint8_t blue) {
- uint8_t r_pwm0 = 0; // Register data - PWM value
- uint8_t r_pwm1 = 0; // Register data - PWM value
-
- uint8_t op_g = 0, op_r = 0, op_b = 0; // Opcodes - Green, Red, Blue
-
- // Light theory! GREEN takes priority because
- // it's the most visible to the human eye.
- if (green == 0) op_g = PCA9533_LED_OP_OFF;
- else if (green == 255) op_g = PCA9533_LED_OP_ON;
- else { r_pwm0 = green; op_g = PCA9533_LED_OP_PWM0; }
-
- // RED
- if (red == 0) op_r = PCA9533_LED_OP_OFF;
- else if (red == 255) op_r = PCA9533_LED_OP_ON;
- else if (r_pwm0 == 0 || r_pwm0 == red) {
- r_pwm0 = red; op_r = PCA9533_LED_OP_PWM0;
- }
- else {
- r_pwm1 = red; op_r = PCA9533_LED_OP_PWM1;
- }
-
- // BLUE
- if (blue == 0) op_b = PCA9533_LED_OP_OFF;
- else if (blue == 255) op_b = PCA9533_LED_OP_ON;
- else if (r_pwm0 == 0 || r_pwm0 == blue) {
- r_pwm0 = blue; op_b = PCA9533_LED_OP_PWM0;
- }
- else if (r_pwm1 == 0 || r_pwm1 == blue) {
- r_pwm1 = blue; op_b = PCA9533_LED_OP_PWM1;
- }
- else {
- /**
- * Conflict. 3 values are requested but only 2 channels exist.
- * G is on channel 0 and R is on channel 1, so work from there.
- * Find the closest match, average the values, then use the free channel.
- */
- uint8_t dgb = ABS(green - blue),
- dgr = ABS(green - red),
- dbr = ABS(blue - red);
- if (dgb < dgr && dgb < dbr) { // Mix with G on channel 0.
- op_b = PCA9533_LED_OP_PWM0;
- r_pwm0 = uint8_t(((uint16_t)green + (uint16_t)blue) / 2);
- }
- else if (dbr <= dgr && dbr <= dgb) { // Mix with R on channel 1.
- op_b = PCA9533_LED_OP_PWM1;
- r_pwm1 = uint8_t(((uint16_t)red + (uint16_t)blue) / 2);
- }
- else { // Mix R+G on 0 and put B on 1.
- op_r = PCA9533_LED_OP_PWM0;
- r_pwm0 = uint8_t(((uint16_t)green + (uint16_t)red) / 2);
- op_b = PCA9533_LED_OP_PWM1;
- r_pwm1 = blue;
- }
- }
-
- // Write the changes to the hardware
- PCA9533_writeAllRegisters(0, r_pwm0, 0, r_pwm1,
- (op_g << PCA9533_LED_OFS_GRN) | (op_r << PCA9533_LED_OFS_RED) | (op_b << PCA9533_LED_OFS_BLU)
- );
- }
-
- #endif // PCA9533
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