mirror of https://github.com/ArduPilot/ardupilot
315 lines
8.8 KiB
C++
315 lines
8.8 KiB
C++
/*
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APM_RC_APM2.cpp - Radio Control Library for Ardupilot Mega 2.0. Arduino
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Code by Jordi Muñoz and Jose Julio. 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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RC Input : PPM signal on IC4 pin
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RC Output : 11 Servo outputs (standard 20ms frame)
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Methods:
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Init() : Initialization of interrupts an Timers
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OutpuCh(ch,pwm) : Output value to servos (range : 900-2100us) ch=0..10
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InputCh(ch) : Read a channel input value. ch=0..7
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GetState() : Returns the state of the input. 1 => New radio frame to process
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Automatically resets when we call InputCh to read channels
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*/
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#include "APM_RC_APM2.h"
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#include "WProgram.h"
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#if !defined(__AVR_ATmega1280__) && !defined(__AVR_ATmega2560__)
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# error Please check the Tools/Board menu to ensure you have selected Arduino Mega as your target.
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#else
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// Variable definition for Input Capture interrupt
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volatile uint16_t APM_RC_APM2::_PWM_RAW[NUM_CHANNELS] = {2400,2400,2400,2400,2400,2400,2400,2400};
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volatile uint8_t APM_RC_APM2::_radio_status=0;
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/****************************************************
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Input Capture Interrupt ICP5 => PPM signal read
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****************************************************/
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void APM_RC_APM2::_timer5_capt_cb(void)
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{
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static uint16_t prev_icr;
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static uint8_t frame_idx;
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uint16_t icr;
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uint16_t pwidth;
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icr = ICR5;
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// Calculate pulse width assuming timer overflow TOP = 40000
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if ( icr < prev_icr ) {
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pwidth = ( icr + 40000 ) - prev_icr;
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} else {
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pwidth = icr - prev_icr;
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}
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// Was it a sync pulse? If so, reset frame.
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if ( pwidth > 8000 ) {
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frame_idx=0;
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} else {
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// Save pulse into _PWM_RAW array.
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if ( frame_idx < NUM_CHANNELS ) {
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_PWM_RAW[ frame_idx++ ] = pwidth;
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// If this is the last pulse in a frame, set _radio_status.
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if (frame_idx >= NUM_CHANNELS) {
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_radio_status = 1;
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}
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}
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}
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// Save icr for next call.
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prev_icr = icr;
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}
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// Constructors ////////////////////////////////////////////////////////////////
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APM_RC_APM2::APM_RC_APM2()
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{
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}
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// Public Methods //////////////////////////////////////////////////////////////
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void APM_RC_APM2::Init( Arduino_Mega_ISR_Registry * isr_reg )
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{
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// --------------------- TIMER1: OUT1 and OUT2 -----------------------
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pinMode(12,OUTPUT); // OUT1 (PB6/OC1B)
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pinMode(11,OUTPUT); // OUT2 (PB5/OC1A)
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// WGM: 1 1 1 0. Clear Timer on Compare, TOP is ICR1.
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// CS11: prescale by 8 => 0.5us tick
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TCCR1A =((1<<WGM11));
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TCCR1B = (1<<WGM13)|(1<<WGM12)|(1<<CS11);
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ICR1 = 40000; // 0.5us tick => 50hz freq
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OCR1A = 0xFFFF; // Init OCR registers to nil output signal
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OCR1B = 0xFFFF;
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// --------------- TIMER4: OUT3, OUT4, and OUT5 ---------------------
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pinMode(8,OUTPUT); // OUT3 (PH5/OC4C)
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pinMode(7,OUTPUT); // OUT4 (PH4/OC4B)
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pinMode(6,OUTPUT); // OUT5 (PH3/OC4A)
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// WGM: 1 1 1 0. Clear Timer on Compare, TOP is ICR4.
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// CS41: prescale by 8 => 0.5us tick
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TCCR4A =((1<<WGM41));
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TCCR4B = (1<<WGM43)|(1<<WGM42)|(1<<CS41);
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OCR4A = 0xFFFF; // Init OCR registers to nil output signal
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OCR4B = 0xFFFF;
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OCR4C = 0xFFFF;
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ICR4 = 40000; // 0.5us tick => 50hz freq
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//--------------- TIMER3: OUT6, OUT7, and OUT8 ----------------------
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pinMode(3,OUTPUT); // OUT6 (PE5/OC3C)
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pinMode(2,OUTPUT); // OUT7 (PE4/OC3B)
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pinMode(5,OUTPUT); // OUT8 (PE3/OC3A)
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// WGM: 1 1 1 0. Clear timer on Compare, TOP is ICR3
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// CS31: prescale by 8 => 0.5us tick
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TCCR3A =((1<<WGM31));
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TCCR3B = (1<<WGM33)|(1<<WGM32)|(1<<CS31);
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OCR3A = 0xFFFF; // Init OCR registers to nil output signal
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OCR3B = 0xFFFF;
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OCR3C = 0xFFFF;
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ICR3 = 40000; // 0.5us tick => 50hz freq
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//--------------- TIMER5: PPM INPUT ---------------------------------
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// Init PPM input on Timer 5
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pinMode(48, INPUT); // PPM Input (PL1/ICP5)
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// WGM: 1 1 1 1. Fast PWM, TOP is OCR5A
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// COM all disabled.
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// CS51: prescale by 8 => 0.5us tick
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// ICES5: Input Capture on rising edge
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TCCR5A =((1<<WGM50)|(1<<WGM51));
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// Input Capture rising edge
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TCCR5B = ((1<<WGM53)|(1<<WGM52)|(1<<CS51)|(1<<ICES5));
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OCR5A = 40000; // 0.5us tick => 50hz freq. The input capture routine
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// assumes this 40000 for TOP.
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isr_reg->register_signal( ISR_REGISTRY_TIMER5_CAPT, _timer5_capt_cb );
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// Enable Input Capture interrupt
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TIMSK5 |= (1<<ICIE5);
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}
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void APM_RC_APM2::OutputCh(unsigned char ch, uint16_t pwm)
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{
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pwm=constrain(pwm,MIN_PULSEWIDTH,MAX_PULSEWIDTH);
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pwm<<=1; // pwm*2;
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switch(ch)
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{
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case 0: OCR1B=pwm; break; // out1
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case 1: OCR1A=pwm; break; // out2
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case 2: OCR4C=pwm; break; // out3
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case 3: OCR4B=pwm; break; // out4
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case 4: OCR4A=pwm; break; // out5
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case 5: OCR3C=pwm; break; // out6
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case 6: OCR3B=pwm; break; // out7
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case 7: OCR3A=pwm; break; // out8
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}
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}
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void APM_RC_APM2::enable_out(uint8_t ch)
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{
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switch(ch) {
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case 0: TCCR1A |= (1<<COM1B1); break; // CH_1 : OC1B
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case 1: TCCR1A |= (1<<COM1A1); break; // CH_2 : OC1A
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case 2: TCCR4A |= (1<<COM4C1); break; // CH_3 : OC4C
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case 3: TCCR4A |= (1<<COM4B1); break; // CH_4 : OC4B
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case 4: TCCR4A |= (1<<COM4A1); break; // CH_5 : OC4A
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case 5: TCCR3A |= (1<<COM3C1); break; // CH_6 : OC3C
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case 6: TCCR3A |= (1<<COM3B1); break; // CH_7 : OC3B
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case 7: TCCR3A |= (1<<COM3A1); break; // CH_8 : OC3A
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}
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}
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void APM_RC_APM2::disable_out(uint8_t ch)
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{
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switch(ch) {
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case 0: TCCR1A &= ~(1<<COM1B1); break; // CH_1 : OC1B
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case 1: TCCR1A &= ~(1<<COM1A1); break; // CH_2 : OC1A
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case 2: TCCR4A &= ~(1<<COM4C1); break; // CH_3 : OC4C
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case 3: TCCR4A &= ~(1<<COM4B1); break; // CH_4 : OC4B
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case 4: TCCR4A &= ~(1<<COM4A1); break; // CH_5 : OC4A
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case 5: TCCR3A &= ~(1<<COM3C1); break; // CH_6 : OC3C
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case 6: TCCR3A &= ~(1<<COM3B1); break; // CH_7 : OC3B
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case 7: TCCR3A &= ~(1<<COM3A1); break; // CH_8 : OC3A
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}
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}
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uint16_t APM_RC_APM2::InputCh(unsigned char ch)
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{
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uint16_t result;
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uint16_t result2;
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if (_HIL_override[ch] != 0) {
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return _HIL_override[ch];
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}
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// Because servo pulse variables are 16 bits and the interrupts are running values could be corrupted.
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// We dont want to stop interrupts to read radio channels so we have to do two readings to be sure that the value is correct...
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result = _PWM_RAW[ch]>>1; // Because timer runs at 0.5us we need to do value/2
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result2 = _PWM_RAW[ch]>>1;
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if (result != result2)
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result = _PWM_RAW[ch]>>1; // if the results are different we make a third reading (this should be fine)
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// Limit values to a valid range
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result = constrain(result,MIN_PULSEWIDTH,MAX_PULSEWIDTH);
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_radio_status=0; // Radio channel read
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return(result);
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}
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unsigned char APM_RC_APM2::GetState(void)
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{
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return(_radio_status);
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}
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// InstantPWM is not implemented!
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void APM_RC_APM2::Force_Out(void) { }
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void APM_RC_APM2::Force_Out0_Out1(void) { }
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void APM_RC_APM2::Force_Out2_Out3(void) { }
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void APM_RC_APM2::Force_Out6_Out7(void) { }
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/* ---------------- OUTPUT SPEED CONTROL ------------------ */
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// Output rate options:
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#define OUTPUT_SPEED_50HZ 0
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#define OUTPUT_SPEED_200HZ 1
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#define OUTPUT_SPEED_400HZ 2
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void APM_RC_APM2::SetFastOutputChannels(uint32_t chmask)
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{
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if ((chmask & ( _BV(CH_1) | _BV(CH_2))) != 0)
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_set_speed_ch1_ch2(OUTPUT_SPEED_400HZ);
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if ((chmask & ( _BV(CH_3) | _BV(CH_4) | _BV(CH_5))) != 0)
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_set_speed_ch3_ch4_ch5(OUTPUT_SPEED_400HZ);
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if ((chmask & ( _BV(CH_6) | _BV(CH_7) | _BV(CH_8))) != 0)
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_set_speed_ch6_ch7_ch8(OUTPUT_SPEED_400HZ);
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}
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void APM_RC_APM2::_set_speed_ch1_ch2(uint8_t speed)
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{
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switch(speed) {
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case OUTPUT_SPEED_400HZ:
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ICR1 = 5000;
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break;
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case OUTPUT_SPEED_200HZ:
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ICR1 = 10000;
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break;
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case OUTPUT_SPEED_50HZ:
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default:
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ICR1 = 40000;
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break;
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}
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}
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void APM_RC_APM2::_set_speed_ch3_ch4_ch5(uint8_t speed)
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{
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switch(speed) {
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case OUTPUT_SPEED_400HZ:
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ICR4 = 5000;
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break;
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case OUTPUT_SPEED_200HZ:
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ICR4 = 10000;
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break;
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case OUTPUT_SPEED_50HZ:
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default:
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ICR4 = 40000;
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break;
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}
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}
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void APM_RC_APM2::_set_speed_ch6_ch7_ch8(uint8_t speed)
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{
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switch(speed) {
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case OUTPUT_SPEED_400HZ:
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ICR3 = 5000;
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break;
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case OUTPUT_SPEED_200HZ:
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ICR3 = 10000;
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break;
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case OUTPUT_SPEED_50HZ:
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default:
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ICR3 = 40000;
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break;
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}
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}
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// allow HIL override of RC values
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// A value of -1 means no change
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// A value of 0 means no override, use the real RC values
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bool APM_RC_APM2::setHIL(int16_t v[NUM_CHANNELS])
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{
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uint8_t sum = 0;
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for (unsigned char i=0; i<NUM_CHANNELS; i++) {
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if (v[i] != -1) {
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_HIL_override[i] = v[i];
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}
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if (_HIL_override[i] != 0) {
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sum++;
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}
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}
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if (sum == 0) {
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return 0;
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} else {
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return 1;
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}
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_radio_status = 1;
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}
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void APM_RC_APM2::clearOverride(void)
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{
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for (unsigned char i=0; i<NUM_CHANNELS; i++) {
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_HIL_override[i] = 0;
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}
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}
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#endif
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