ardupilot/libraries/AP_Notify/NCP5623.cpp

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/*
NCP5623 I2C LED driver
*/
/*
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 <http://www.gnu.org/licenses/>.
*/
#include "NCP5623.h"
#include <utility>
#include <AP_HAL/AP_HAL.h>
extern const AP_HAL::HAL& hal;
#define NCP5623_LED_BRIGHT 0x1f // full brightness
#define NCP5623_LED_MEDIUM 0x18 // medium brightness
#define NCP5623_LED_DIM 0x0f // dim
#define NCP5623_LED_OFF 0x00 // off
#define NCP5623_LED_I2C_ADDR 0x38 // default I2C bus address
#define NCP5623_C_LED_I2C_ADDR 0x39 // default I2C bus address for the NCP5623C
#define NCP5623_LED_PWM0 0x40 // pwm0 register
#define NCP5623_LED_PWM1 0x60 // pwm1 register
#define NCP5623_LED_PWM2 0x80 // pwm2 register
#define NCP5623_LED_ENABLE 0x20 // enable register
NCP5623::NCP5623(uint8_t bus)
: RGBLed(NCP5623_LED_OFF, NCP5623_LED_BRIGHT, NCP5623_LED_MEDIUM, NCP5623_LED_DIM)
, _bus(bus)
{
}
bool NCP5623::write(uint8_t reg, uint8_t data)
{
uint8_t msg[1] = { 0x00 };
// scale to 0 to 0x1F
data = (data * 255U) / 0x1FU;
msg[0] = ((reg & 0xe0) | (data & 0x1f));
bool ret = _dev->transfer(msg, 1, nullptr, 0);
return ret;
}
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bool NCP5623::write_pwm(uint8_t _rgb[3])
{
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uint8_t reg = NCP5623_LED_PWM0;
for (uint8_t i=0; i<3; i++) {
if (!write(reg+i*0x20, _rgb[i])) {
return false;
}
}
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return true;
}
bool NCP5623::init(void)
{
uint8_t addrs[] = { NCP5623_LED_I2C_ADDR, NCP5623_C_LED_I2C_ADDR };
for (uint8_t i=0; i<ARRAY_SIZE(addrs); i++) {
// first look for led on external bus
_dev = std::move(hal.i2c_mgr->get_device(_bus, addrs[i]));
if (!_dev) {
continue;
}
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_dev->get_semaphore()->take_blocking();
_dev->set_retries(10);
// enable the led
bool ret = write(NCP5623_LED_ENABLE, 0x1f);
if (!ret) {
_dev->get_semaphore()->give();
continue;
}
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// update the red, green and blue values to zero
uint8_t off[3] = { _led_off, _led_off, _led_off };
ret = write_pwm(off);
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_dev->set_retries(1);
// give back i2c semaphore
_dev->get_semaphore()->give();
if (ret) {
_dev->register_periodic_callback(20000, FUNCTOR_BIND_MEMBER(&NCP5623::_timer, void));
}
return true;
}
return false;
}
// set_rgb - set color as a combination of red, green and blue values
bool NCP5623::hw_set_rgb(uint8_t red, uint8_t green, uint8_t blue)
{
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rgb[0] = red;
rgb[1] = green;
rgb[2] = blue;
_need_update = true;
return true;
}
void NCP5623::_timer(void)
{
if (!_need_update) {
return;
}
_need_update = false;
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write_pwm(rgb);
}