116 lines
3.1 KiB
C++
116 lines
3.1 KiB
C++
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/*
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NCP5623 I2C LED driver
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*/
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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 3 of the License, or
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(at your option) any later version.
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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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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 "NCP5623.h"
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#include <utility>
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#include <AP_HAL/AP_HAL.h>
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extern const AP_HAL::HAL& hal;
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#define NCP5623_LED_BRIGHT 0x1f // full brightness
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#define NCP5623_LED_MEDIUM 0x18 // medium brightness
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#define NCP5623_LED_DIM 0x0f // dim
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#define NCP5623_LED_OFF 0x00 // off
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#define NCP5623_LED_I2C_ADDR 0x38 // default I2C bus address
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#define NCP5623_LED_PWM0 0x40 // pwm0 register
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#define NCP5623_LED_PWM1 0x60 // pwm1 register
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#define NCP5623_LED_PWM2 0x80 // pwm2 register
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#define NCP5623_LED_ENABLE 0x20 // enable register
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NCP5623::NCP5623(uint8_t bus)
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: RGBLed(NCP5623_LED_OFF, NCP5623_LED_BRIGHT, NCP5623_LED_MEDIUM, NCP5623_LED_DIM)
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, _bus(bus)
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{
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}
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bool NCP5623::write(uint8_t reg, uint8_t data)
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{
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uint8_t msg[1] = { 0x00 };
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msg[0] = ((reg & 0xe0) | (data & 0x1f));
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bool ret = _dev->transfer(msg, 1, nullptr, 0);
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return ret;
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}
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bool NCP5623::writes(uint8_t *data, uint8_t len)
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{
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bool ret = 0;
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uint8_t reg = data[0];
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for (uint8_t i = 0; i < (len - 1); i++) {
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ret = write(reg, data[i + 1]);
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if (!ret) {
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return ret;
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}
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reg = reg + 0x20;
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}
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return ret;
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}
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bool NCP5623::hw_init(void)
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{
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// first look for led on external bus
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_dev = std::move(hal.i2c_mgr->get_device(_bus, NCP5623_LED_I2C_ADDR));
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if (!_dev || !_dev->get_semaphore()->take(HAL_SEMAPHORE_BLOCK_FOREVER)) {
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return false;
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}
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_dev->set_retries(10);
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// enable the led
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bool ret = write(NCP5623_LED_ENABLE, 0x1f);
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if (!ret) {
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_dev->get_semaphore()->give();
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return false;
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}
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// update the red, green and blue values to zero
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uint8_t val[4] = { NCP5623_LED_PWM0, _led_off, _led_off, _led_off };
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ret = writes(val, sizeof(val));
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_dev->set_retries(1);
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// give back i2c semaphore
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_dev->get_semaphore()->give();
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if (ret) {
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_dev->register_periodic_callback(20000, FUNCTOR_BIND_MEMBER(&NCP5623::_timer, void));
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}
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return ret;
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}
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// set_rgb - set color as a combination of red, green and blue values
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bool NCP5623::hw_set_rgb(uint8_t red, uint8_t green, uint8_t blue)
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{
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rgb = { red, green, blue };
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_need_update = true;
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return true;
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}
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void NCP5623::_timer(void)
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{
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if (!_need_update) {
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return;
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}
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_need_update = false;
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/* 4-bit for each color */
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uint8_t val[4] = { NCP5623_LED_PWM0, rgb.r, rgb.g, rgb.b };
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writes(val, sizeof(val));
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}
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