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https://github.com/ArduPilot/ardupilot
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Deleted APM_RC_QUAD library which is no longer used - we should all be relying on APM_RC now
git-svn-id: https://arducopter.googlecode.com/svn/trunk@976 f9c3cf11-9bcb-44bc-f272-b75c42450872
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rmackay9@yahoo.com
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/*
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APM_RC_QUAD.cpp - Radio Control Library for Ardupilot Mega. 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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This is a special version of the library for use in Quadcopters
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Because we have modified servo outputs 0..3 to have a higher rate (300Hz)
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RC Input : PPM signal on IC4 pin
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RC Output : 8 servo Outputs,
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OUT0..OUT3 : 300Hz Servo output (for Quad ESC´s)
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OUT4..OUT7 : standard 50Hz servo outputs
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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_QUAD.h"
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#include <avr/interrupt.h>
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#include "WProgram.h"
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// Variable definition for Input Capture interrupt
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volatile unsigned int ICR4_old;
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volatile unsigned char PPM_Counter=0;
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volatile unsigned int PWM_RAW[8] = {2400,2400,2400,2400,2400,2400,2400,2400};
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volatile unsigned char radio_status=0;
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/****************************************************
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Input Capture Interrupt ICP4 => PPM signal read
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****************************************************/
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ISR(TIMER4_CAPT_vect)
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{
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unsigned int Pulse;
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unsigned int Pulse_Width;
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Pulse=ICR4;
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if (Pulse<ICR4_old) // Take care of the overflow of Timer4 (TOP=40000)
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Pulse_Width=(Pulse + 40000)-ICR4_old; //Calculating pulse
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else
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Pulse_Width=Pulse-ICR4_old; //Calculating pulse
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if (Pulse_Width>8000) // SYNC pulse?
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PPM_Counter=0;
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else
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{
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PPM_Counter &= 0x07; // For safety only (limit PPM_Counter to 7)
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PWM_RAW[PPM_Counter++]=Pulse_Width; //Saving pulse.
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if (PPM_Counter >= NUM_CHANNELS)
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radio_status = 1;
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}
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ICR4_old = Pulse;
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}
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// Constructors ////////////////////////////////////////////////////////////////
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APM_RC_QUAD_Class::APM_RC_QUAD_Class()
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{
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}
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// Public Methods //////////////////////////////////////////////////////////////
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void APM_RC_QUAD_Class::Init(void)
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{
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// Init PWM Timer 1
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//pinMode(11,OUTPUT); // (PB5/OC1A)
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pinMode(12,OUTPUT); //OUT2 (PB6/OC1B)
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pinMode(13,OUTPUT); //OUT3 (PB7/OC1C)
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//Remember the registers not declared here remains zero by default...
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TCCR1A =((1<<WGM11)|(1<<COM1B1)|(1<<COM1C1)); //Please read page 131 of DataSheet, we are changing the registers settings of WGM11,COM1B1,COM1A1 to 1 thats all...
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TCCR1B = (1<<WGM13)|(1<<WGM12)|(1<<CS11); //Prescaler set to 8, that give us a resolution of 0.5us, read page 134 of data sheet
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//OCR1A = 3000; //PB5, none
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OCR1B = 3000; //PB6, OUT2
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OCR1C = 3000; //PB7 OUT3
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ICR1 = 6600; //300hz freq...
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// Init PWM Timer 3
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pinMode(2,OUTPUT); //OUT7 (PE4/OC3B)
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pinMode(3,OUTPUT); //OUT6 (PE5/OC3C)
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//pinMode(4,OUTPUT); // (PE3/OC3A)
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TCCR3A =((1<<WGM31)|(1<<COM3B1)|(1<<COM3C1));
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TCCR3B = (1<<WGM33)|(1<<WGM32)|(1<<CS31);
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//OCR3A = 3000; //PE3, NONE
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OCR3B = 3000; //PE4, OUT7
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OCR3C = 3000; //PE5, OUT6
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ICR3 = 40000; //50hz freq (standard servos)
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// Init PWM Timer 5
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pinMode(44,OUTPUT); //OUT1 (PL5/OC5C)
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pinMode(45,OUTPUT); //OUT0 (PL4/OC5B)
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//pinMode(46,OUTPUT); // (PL3/OC5A)
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TCCR5A =((1<<WGM51)|(1<<COM5B1)|(1<<COM5C1));
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TCCR5B = (1<<WGM53)|(1<<WGM52)|(1<<CS51);
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//OCR5A = 3000; //PL3,
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OCR5B = 3000; //PL4, OUT0
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OCR5C = 3000; //PL5, OUT1
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ICR5 = 6600; //300hz freq
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// Init PPM input and PWM Timer 4
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pinMode(49, INPUT); // ICP4 pin (PL0) (PPM input)
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pinMode(7,OUTPUT); //OUT5 (PH4/OC4B)
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pinMode(8,OUTPUT); //OUT4 (PH5/OC4C)
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TCCR4A =((1<<WGM40)|(1<<WGM41)|(1<<COM4C1)|(1<<COM4B1)|(1<<COM4A1));
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//Prescaler set to 8, that give us a resolution of 0.5us
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// Input Capture rising edge
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TCCR4B = ((1<<WGM43)|(1<<WGM42)|(1<<CS41)|(1<<ICES4));
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OCR4A = 40000; ///50hz freq. (standard servos)
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OCR4B = 3000; //PH4, OUT5
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OCR4C = 3000; //PH5, OUT4
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//TCCR4B |=(1<<ICES4); //Changing edge detector (rising edge).
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//TCCR4B &=(~(1<<ICES4)); //Changing edge detector. (falling edge)
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TIMSK4 |= (1<<ICIE4); // Enable Input Capture interrupt. Timer interrupt mask
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}
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void APM_RC_QUAD_Class::OutputCh(unsigned char ch, int 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: OCR5B=pwm; break; //ch0
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case 1: OCR5C=pwm; break; //ch1
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case 2: OCR1B=pwm; break; //ch2
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case 3: OCR1C=pwm; break; //ch3
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case 4: OCR4C=pwm; break; //ch4
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case 5: OCR4B=pwm; break; //ch5
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case 6: OCR3C=pwm; break; //ch6
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case 7: OCR3B=pwm; break; //ch7
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}
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}
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int APM_RC_QUAD_Class::InputCh(unsigned char ch)
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{
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int result;
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int result2;
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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_QUAD_Class::GetState(void)
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{
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return(radio_status);
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}
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// make one instance for the user to use
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APM_RC_QUAD_Class APM_RC_QUAD;
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@ -1,21 +0,0 @@
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#ifndef APM_RC_QUAD_h
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#define APM_RC_QUAD_h
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#define NUM_CHANNELS 8
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#define MIN_PULSEWIDTH 900
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#define MAX_PULSEWIDTH 2100
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class APM_RC_QUAD_Class
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{
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private:
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public:
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APM_RC_QUAD_Class();
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void Init();
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void OutputCh(unsigned char ch, int pwm);
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int InputCh(unsigned char ch);
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unsigned char GetState();
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};
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extern APM_RC_QUAD_Class APM_RC_QUAD;
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#endif
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@ -1,31 +0,0 @@
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/*
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Example of APM_RC library.
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Code by Jordi Muñoz and Jose Julio. DIYDrones.com
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Print Input values and send Output to the servos
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(Works with last PPM_encoder firmware)
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*/
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#include <APM_RC.h> // ArduPilot Mega RC Library
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void setup()
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{
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APM_RC.Init(); // APM Radio initialization
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Serial.begin(57600);
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Serial.println("ArduPilot Mega RC library test");
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delay(1000);
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}
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void loop()
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{
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if (APM_RC.GetState()==1) // New radio frame? (we could use also if((millis()- timer) > 20)
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{
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Serial.print("CH:");
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for(int i=0;i<8;i++)
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{
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Serial.print(APM_RC.InputCh(i)); // Print channel values
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Serial.print(",");
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APM_RC.OutputCh(i,APM_RC.InputCh(i)); // Copy input to Servos
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}
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Serial.println();
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}
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}
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@ -1,5 +0,0 @@
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APM_RC_QUAD KEYWORD1
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begin KEYWORD2
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InputCh KEYWORD2
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OutputCh KEYWORD2
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GetState KEYWORD2
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