ardupilot/libraries/AP_RPM/RPM_Pin.cpp

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/*
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 <AP_HAL/AP_HAL.h>
#if CONFIG_HAL_BOARD == HAL_BOARD_PX4 || CONFIG_HAL_BOARD == HAL_BOARD_VRBRAIN
#include <AP_BoardConfig/AP_BoardConfig.h>
#include <board_config.h>
#include "RPM_Pin.h"
#include <stdio.h>
extern const AP_HAL::HAL& hal;
AP_RPM_Pin::IrqState AP_RPM_Pin::irq_state[RPM_MAX_INSTANCES];
/*
open the sensor in constructor
*/
AP_RPM_Pin::AP_RPM_Pin(AP_RPM &_ap_rpm, uint8_t instance, AP_RPM::RPM_State &_state) :
AP_RPM_Backend(_ap_rpm, instance, _state)
{
}
/*
handle interrupt on an instance
*/
void AP_RPM_Pin::irq_handler(uint8_t instance)
{
uint32_t now = AP_HAL::micros();
uint32_t dt = now - irq_state[instance].last_pulse_us;
irq_state[instance].last_pulse_us = now;
// we don't accept pulses less than 100us. Using an irq for such
// high RPM is too inaccurate, and it is probably just bounce of
// the signal which we should ignore
if (dt > 100 && dt < 1000*1000) {
irq_state[instance].dt_sum += dt;
irq_state[instance].dt_count++;
}
}
/*
interrupt handler for instance 0
*/
int AP_RPM_Pin::irq_handler0(int irq, void *context)
{
irq_handler(0);
return 0;
}
/*
interrupt handler for instance 1
*/
int AP_RPM_Pin::irq_handler1(int irq, void *context)
{
irq_handler(1);
return 0;
}
void AP_RPM_Pin::update(void)
{
if (last_pin != get_pin()) {
last_pin = get_pin();
uint32_t gpio = 0;
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#ifdef GPIO_GPIO0_INPUT
switch (last_pin) {
case 50:
gpio = GPIO_GPIO0_INPUT;
break;
case 51:
gpio = GPIO_GPIO1_INPUT;
break;
case 52:
gpio = GPIO_GPIO2_INPUT;
break;
case 53:
gpio = GPIO_GPIO3_INPUT;
break;
case 54:
gpio = GPIO_GPIO4_INPUT;
break;
case 55:
gpio = GPIO_GPIO5_INPUT;
break;
}
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#endif // GPIO_GPIO5_INPUT
// uninstall old handler if installed
if (last_gpio != 0) {
stm32_gpiosetevent(last_gpio, false, false, false, nullptr);
}
irq_state[state.instance].dt_count = 0;
irq_state[state.instance].dt_sum = 0;
last_gpio = gpio;
if (gpio == 0) {
return;
}
// install interrupt handler on rising edge of pin. This works
// for either polarity of pulse, as all we want is the period
stm32_gpiosetevent(gpio, true, false, false,
state.instance==0?irq_handler0:irq_handler1);
}
if (irq_state[state.instance].dt_count > 0) {
float dt_avg;
// disable interrupts to prevent race with irq_handler
irqstate_t istate = irqsave();
dt_avg = irq_state[state.instance].dt_sum / irq_state[state.instance].dt_count;
irq_state[state.instance].dt_count = 0;
irq_state[state.instance].dt_sum = 0;
irqrestore(istate);
const float scaling = ap_rpm._scaling[state.instance];
float maximum = ap_rpm._maximum[state.instance];
float minimum = ap_rpm._minimum[state.instance];
float quality = 0;
float rpm = scaling * (1.0e6 / dt_avg) * 60;
float filter_value = signal_quality_filter.get();
state.rate_rpm = signal_quality_filter.apply(rpm);
if ((maximum <= 0 || rpm <= maximum) && (rpm >= minimum)) {
if (is_zero(filter_value)){
quality = 0;
} else {
quality = 1 - constrain_float((fabsf(rpm-filter_value))/filter_value, 0.0, 1.0);
quality = powf(quality, 2.0);
}
state.last_reading_ms = AP_HAL::millis();
} else {
quality = 0;
}
state.signal_quality = (0.1 * quality) + (0.9 * state.signal_quality);
}
// assume we get readings at at least 1Hz, otherwise reset quality to zero
if (AP_HAL::millis() - state.last_reading_ms > 1000) {
state.signal_quality = 0;
state.rate_rpm = 0;
}
}
#endif // CONFIG_HAL_BOARD