mirror of
https://github.com/iNavFlight/inav.git
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112 lines
3.2 KiB
C
112 lines
3.2 KiB
C
/*
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* This file is part of Cleanflight.
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*
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* Cleanflight 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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*
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* Foobar 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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*
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* You should have received a copy of the GNU General Public License
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* along with Cleanflight. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "platform.h"
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#include "gpio.h"
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#include "timer.h"
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#include "pwm_mapping.h"
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#include "pwm_rssi.h"
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void pwmICConfig(TIM_TypeDef *tim, uint8_t channel, uint16_t polarity); // from pwm_output.c
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typedef struct rssiInputPort_s {
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uint8_t state;
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captureCompare_t rise;
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captureCompare_t fall;
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captureCompare_t capture;
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uint16_t raw;
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const timerHardware_t *timerHardware;
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} rssiInputPort_t;
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static rssiInputPort_t rssiInputPort;
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static void pwmRssiCallback(uint8_t reference, captureCompare_t capture)
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{
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const timerHardware_t *timerHardware = rssiInputPort.timerHardware;
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if (rssiInputPort.state == 0) {
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rssiInputPort.rise = capture;
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rssiInputPort.state = 1;
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pwmICConfig(timerHardware->tim, timerHardware->channel, TIM_ICPolarity_Falling);
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} else {
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rssiInputPort.fall = capture;
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// compute and store capture
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rssiInputPort.raw = rssiInputPort.fall - rssiInputPort.rise;
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// switch state
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rssiInputPort.state = 0;
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pwmICConfig(timerHardware->tim, timerHardware->channel, TIM_ICPolarity_Rising);
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}
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}
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static void pwmRSSIGPIOConfig(GPIO_TypeDef *gpio, uint32_t pin, GPIO_Mode mode)
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{
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gpio_config_t cfg;
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cfg.pin = pin;
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cfg.mode = mode;
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cfg.speed = Speed_2MHz;
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gpioInit(gpio, &cfg);
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}
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void pwmRSSIICConfig(TIM_TypeDef *tim, uint8_t channel, uint16_t polarity)
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{
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TIM_ICInitTypeDef TIM_ICInitStructure;
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TIM_ICStructInit(&TIM_ICInitStructure);
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TIM_ICInitStructure.TIM_Channel = channel;
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TIM_ICInitStructure.TIM_ICPolarity = polarity;
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TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
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TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
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TIM_ICInitStructure.TIM_ICFilter = 0x00;
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TIM_ICInit(tim, &TIM_ICInitStructure);
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}
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#define UNUSED_CALLBACK_REFERENCE 0
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void pwmRSSIInConfig(uint8_t timerIndex)
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{
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const timerHardware_t *timerHardwarePtr = &(timerHardware[timerIndex]);
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memset(&rssiInputPort, 0, sizeof(rssiInputPort));
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rssiInputPort.timerHardware = timerHardwarePtr;
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pwmRSSIGPIOConfig(timerHardwarePtr->gpio, timerHardwarePtr->pin, timerHardwarePtr->gpioInputMode);
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pwmRSSIICConfig(timerHardwarePtr->tim, timerHardwarePtr->channel, TIM_ICPolarity_Rising);
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timerConfigure(timerHardwarePtr, 0xFFFF, 1);
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configureTimerCaptureCompareInterrupt(timerHardwarePtr, UNUSED_CALLBACK_REFERENCE, pwmRssiCallback);
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}
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uint16_t pwmRSSIRead(void)
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{
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return rssiInputPort.raw;
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}
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