ardupilot/libraries/AP_Notify/ToshibaLED_I2C.cpp

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/*
ToshibaLED I2C 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/>.
*/
/* LED driver for TCA62724FMG */
#include "ToshibaLED_I2C.h"
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#include <utility>
#include <AP_HAL/AP_HAL.h>
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extern const AP_HAL::HAL& hal;
#define TOSHIBA_LED_I2C_ADDR 0x55 // default I2C bus address
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#define TOSHIBA_LED_PWM0 0x01 // pwm0 register
#define TOSHIBA_LED_PWM1 0x02 // pwm1 register
#define TOSHIBA_LED_PWM2 0x03 // pwm2 register
#define TOSHIBA_LED_ENABLE 0x04 // enable register
ToshibaLED_I2C::ToshibaLED_I2C(uint8_t bus)
: ToshibaLED()
, _bus(bus)
{
}
bool ToshibaLED_I2C::hw_init(void)
{
// first look for led on external bus
_dev = std::move(hal.i2c_mgr->get_device(_bus, TOSHIBA_LED_I2C_ADDR));
if (!_dev || !_dev->get_semaphore()->take(HAL_SEMAPHORE_BLOCK_FOREVER)) {
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return false;
}
_dev->set_retries(10);
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// enable the led
bool ret = _dev->write_register(TOSHIBA_LED_ENABLE, 0x03);
if (!ret) {
_dev->get_semaphore()->give();
return false;
}
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// update the red, green and blue values to zero
uint8_t val[4] = { TOSHIBA_LED_PWM0, _led_off, _led_off, _led_off };
ret = _dev->transfer(val, sizeof(val), nullptr, 0);
_dev->set_retries(1);
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// give back i2c semaphore
_dev->get_semaphore()->give();
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if (ret) {
_dev->register_periodic_callback(20000, FUNCTOR_BIND_MEMBER(&ToshibaLED_I2C::_timer, void));
}
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return ret;
}
// set_rgb - set color as a combination of red, green and blue values
bool ToshibaLED_I2C::hw_set_rgb(uint8_t red, uint8_t green, uint8_t blue)
{
rgb = {red, green, blue};
_need_update = true;
return true;
}
void ToshibaLED_I2C::_timer(void)
{
if (!_need_update) {
return;
}
_need_update = false;
/* 4-bit for each color */
uint8_t val[4] = { TOSHIBA_LED_PWM0, (uint8_t)(rgb.b >> 4),
(uint8_t)(rgb.g / 16), (uint8_t)(rgb.r / 16) };
_dev->transfer(val, sizeof(val), nullptr, 0);
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}