mirror of https://github.com/ArduPilot/ardupilot
git-svn-id: https://arducopter.googlecode.com/svn/trunk@282 f9c3cf11-9bcb-44bc-f272-b75c42450872
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jasonshort
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a65098f055
commit
3565a54bf2
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/*
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AP_Radio.cpp - Radio library for Arduino
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Code by Jason Short. DIYDrones.com
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This library is free software; you can redistribute it and / or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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*/
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#include "AP_RC.h"
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#define CH1 0
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#define CH2 1
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#define CH3 2
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#define CH4 3
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#define THROTTLE_PIN 13
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#include <avr/interrupt.h>
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#define CH3TRIM 1100
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// Variable definition for interrupt
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volatile uint16_t timer1count = 0;
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volatile uint16_t timer2count = 0;
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volatile uint16_t timer3count = 0;
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volatile uint16_t timer4count = 0;
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volatile uint16_t timer1diff = 1500 * 2;
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volatile uint16_t timer2diff = 1500 * 2;
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volatile uint16_t timer3diff = 1100 * 2;
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volatile uint16_t timer4diff = 1500 * 2;
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#define CH1_READ 1
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#define CH2_READ 2
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#define CH3_READ 4
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#define CH4_READ 8
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volatile int8_t _rc_ch_read = 0;
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volatile uint8_t _timer_ovf_a = 0;
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volatile uint8_t _timer_ovf_b = 0;
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volatile uint8_t _timer_ovf = 0;
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//volatile uint16_t ap_rc_input[4];
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AP_RC::AP_RC()
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{
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pinMode(11,INPUT); // PB3 - MOSI/OC2 - Throttle in
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pinMode(13,INPUT); // PB5 - SCK - Rudder in
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pinMode(8, OUTPUT); // PB0 - AIN1 - OUTPUT THROTTLE
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pinMode(9, OUTPUT); // PB1 - OC1A - Elevator PWM out
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pinMode(10,OUTPUT); // PB2 - OC1B - Aileron PWM out
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// set Analog out 4 to output
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DDRC |= B00010000;
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}
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void
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AP_RC::read_pwm()
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{
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input[CH1] = timer1diff;
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input[CH2] = timer2diff;
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input[CH3] = timer3diff;
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input[CH4] = timer4diff;
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}
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void AP_RC::init(int trims[])
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{
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// enable pin change interrupt 2 - PCINT23..16
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PCICR = _BV(PCIE2);
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// enable pin change interrupt 0 - PCINT7..0
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PCICR |= _BV(PCIE0);
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// enable in change interrupt on PB5 (digital pin 13)
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PCMSK0 = _BV(PCINT3) | _BV(PCINT5);
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// enable pin change interrupt on PD2,PD3 (digital pin 2,3)
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PCMSK2 = _BV(PCINT18) | _BV(PCINT19);
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// Timer 1
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TCCR1A = ((1 << WGM11) | (1 << COM1B1) | (1 << COM1A1));
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TCCR1B = (1 << WGM13) | (1 << WGM12) | (1 << CS11);
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// apply initial values
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set_ch_pwm(CH1, 1500);
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set_ch_pwm(CH2, 1500);
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ICR1 = 40000;
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// Throttle;
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// Setting up the Timer 2 - 8 bit timer
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TCCR2A = 0x0; // Normal Mode
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TCCR2B = _BV(CS21) |_BV(CS20); //prescaler 32, at 16mhz (32/16) = 2, the counter will increment 1 every 2us
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// apply initial values
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//OCR2A = (trims[CH3]-1000) / 4;
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//OCR2B = trims[CH4] / 4; // center the rudder
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set_ch_pwm(CH3, CH3TRIM);
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set_ch_pwm(CH4, 1500);
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TIMSK1 |= _BV(ICIE1); // Timer / Counter1, Input Capture Interrupt Enable // PB0 - output throttle
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TIMSK2 = _BV(TOIE1) | _BV(OCIE2A) | _BV(OCIE2B); // Timer / Counter2 Compare Match A
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}
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void
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AP_RC::set_ch_pwm(uint8_t ch, uint16_t pwm)
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{
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switch(ch){
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case CH1:
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pwm <<= 1;
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OCR1A = pwm;
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break;
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case CH2:
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pwm <<= 1;
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OCR1B = pwm;
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break;
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case CH3:
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// Jason's fancy 2µs hack
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_timer_out = pwm % 512;
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_timer_ovf_a = pwm / 512;
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_timer_out >>= 1;
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OCR2A = _timer_out;
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break;
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case CH4:
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_timer_out = pwm % 512;
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_timer_ovf_b = pwm / 512;
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_timer_out >>= 1;
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OCR2B = _timer_out;
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break;
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}
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}
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// radio PWM input timers
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ISR(PCINT2_vect) {
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int cnt = TCNT1;
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if(PIND & B00000100){ // ch 1 (pin 2) is high
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if ((_rc_ch_read & CH1_READ) != CH1_READ){
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_rc_ch_read |= CH1_READ;
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timer1count = cnt;
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}
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}else if ((_rc_ch_read & CH1_READ) == CH1_READ){ // ch 1 (pin 2) is Low, and we were reading
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_rc_ch_read &= B11111110;
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if (cnt < timer1count) // Timer1 reset during the read of this pulse
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timer1diff = (cnt + 40000 - timer1count); // Timer1 TOP = 40000
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else
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timer1diff = (cnt - timer1count);
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timer1diff >>= 1;
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}
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if(PIND & B00001000){ // ch 2 (pin 3) is high
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if ((_rc_ch_read & CH2_READ) != CH2_READ){
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_rc_ch_read |= CH2_READ;
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timer2count = cnt;
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}
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}else if ((_rc_ch_read & CH2_READ) == CH2_READ){ // ch 1 (pin 2) is Low
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_rc_ch_read &= B11111101;
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if (cnt < timer2count) // Timer1 reset during the read of this pulse
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timer2diff = (cnt + 40000 - timer2count); // Timer1 TOP = 40000
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else
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timer2diff = (cnt - timer2count);
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timer2diff >>= 1;
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}
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}
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ISR(PCINT0_vect)
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{
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int cnt = TCNT1;
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#if THROTTLE_PIN == 11
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if(PINB & 8){ // pin 11
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#else
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if(PINB & 32){ // pin 13
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#endif
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if ((_rc_ch_read & CH3_READ) != CH3_READ){
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_rc_ch_read |= CH3_READ;
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timer3count = cnt;
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}
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}else if ((_rc_ch_read & CH3_READ) == CH3_READ){ // ch 1 (pin 2) is Low
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_rc_ch_read &= B11111011;
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if (cnt < timer3count) // Timer1 reset during the read of this pulse
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timer3diff = (cnt + 40000 - timer3count); // Timer1 TOP = 40000
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else
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timer3diff = (cnt - timer3count);
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timer3diff >>= 1;
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}
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#if THROTTLE_PIN == 11
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if(PINB & 32){ // pin 13
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#else
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if(PINB & 8){ // pin 11
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#endif
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if ((_rc_ch_read & CH4_READ) != CH4_READ){
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_rc_ch_read |= CH4_READ;
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timer4count = cnt;
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}
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}else if ((_rc_ch_read & CH4_READ) == CH4_READ){ // ch 1 (pin 2) is Low
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_rc_ch_read &= B11110111;
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if (cnt < timer4count) // Timer1 reset during the read of this pulse
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timer4diff = (cnt + 40000 - timer4count); // Timer1 TOP = 40000
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else
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timer4diff = (cnt - timer4count);
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timer4diff >>= 1;
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}
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}
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// Throttle Timer Interrupt
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// ------------------------
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ISR(TIMER1_CAPT_vect) // Timer/Counter1 Capture Event
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{
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//This is a timer 1 interrupts, executed every 20us
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PORTB |= B00000001; //Putting the pin high!
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PORTC |= B00010000; //Putting the pin high!
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TCNT2 = 0; //restarting the counter of timer 2
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_timer_ovf = 0;
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}
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ISR(TIMER2_OVF_vect)
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{
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_timer_ovf++;
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}
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ISR(TIMER2_COMPA_vect) // Timer/Counter2 Compare Match A
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{
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if(_timer_ovf == _timer_ovf_a){
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PORTB &= B11111110; //Putting the pin low
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}
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}
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ISR(TIMER2_COMPB_vect) // Timer/Counter2 Compare Match B Rudder Servo
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{
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if(_timer_ovf == _timer_ovf_b){
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PORTC &= B11101111; //Putting the pin low!
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}
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}
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@ -1,22 +0,0 @@
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#ifndef AP_RC_h
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#define AP_RC_h
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#include <inttypes.h>
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#include "WProgram.h"
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class AP_RC
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{
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public:
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AP_RC();
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void set_ch_pwm(uint8_t ch, uint16_t pwm);
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void init(int trims[]);
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void read_pwm();
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uint16_t input[4];
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private:
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uint16_t _timer_out;
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};
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#endif
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@ -1,4 +0,0 @@
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AP_RC KEYWORD1
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init KEYWORD2
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set_ch_pwm KEYWORD2
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read_pwm KEYWORD2
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