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ArduPPM: PWM to PPM encoder mode

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Added PPM output polarity selection - mainly for stand alone 8 channels encoder board.
This commit is contained in:
Olivier ADLER 2012-11-02 16:31:35 +01:00
parent 01863f95a5
commit f531f49c1a
1 changed files with 22 additions and 7 deletions
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29
Tools/ArduPPM/Libraries/PPM_Encoder.h
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@ -1,5 +1,5 @@
// -------------------------------------------------------------
// PPM ENCODER V2.2.68 (04-06-2012)
// PPM ENCODER V2.2.69 (02-11-2012)
// -------------------------------------------------------------
// Improved servo to ppm for ArduPilot MEGA v1.x (ATmega328p),
// PhoneDrone and APM2 (ATmega32u2)
@ -60,6 +60,10 @@
// 04-06-2012
// V2.2.68 - Fixed possible logic flaw in throttle failsafe reset if _JITTER_FILTER_ is enabled
// 02-11-2012
// V2.2.69 - Added PPM output positive polarity - mainly for standalone PPM encoder board use
// -------------------------------------------------------------
#ifndef _PPM_ENCODER_H_
@ -73,6 +77,7 @@
#include <avr/wdt.h>
#include <util/delay.h>
// -------------------------------------------------------------
// SERVO INPUT FILTERS
// -------------------------------------------------------------
@ -99,14 +104,14 @@
#endif
// -------------------------------------------------------------
// SERVO INPUT MODE - !EXPERIMENTAL!
// INPUT MODE
// -------------------------------------------------------------
#define JUMPER_SELECT_MODE 0 // Default - PPM passtrough mode selected if channel 2&3 shorted. Normal servo input (pwm) if not shorted.
#define SERVO_PWM_MODE 1 // Normal 8 channel servo (pwm) input
#define PPM_PASSTROUGH_MODE 2 // PPM signal passtrough on channel 1
#define JETI_MODE 3 // JETI on channel 1 (reserved but not implemented yet)
#define SPEKTRUM_MODE 4 // Spektrum satelitte on channel 1 (reserved but not implemented yet)
#define JETI_MODE 3 // Reserved
#define SPEKTRUM_MODE 4 // Reserved for Spektrum satelitte on channel 1
// Servo input mode (jumper (default), pwm, ppm, jeti or spektrum)
volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
@ -118,6 +123,7 @@ volatile uint8_t servo_input_mode = JUMPER_SELECT_MODE;
// 400us PPM pre pulse
#define PPM_PRE_PULSE ONE_US * 400
// -------------------------------------------------------------
// SERVO LIMIT VALUES
// -------------------------------------------------------------
@ -175,6 +181,11 @@ volatile uint16_t ppm[ PPM_ARRAY_MAX ] =
PPM_PERIOD
};
// -------------------------------------------------------------
// PPM OUTPUT SETTINGS
// -------------------------------------------------------------
// #define _POSITIVE_PPM_FRAME_ // Switch to positive PPM frame (the positive part of the signal carry the channels timing informations)
// -------------------------------------------------------------
// SERVO POWER ON VALUES
// -------------------------------------------------------------
@ -332,10 +343,14 @@ void ppm_start( void )
// Stop interrupts
cli();
// Make sure initial output state is low
#if defined (_POSITIVE_PPM_FRAME_)
// Make sure initial output state is high
PPM_PORT |= (1 << PPM_OUTPUT_PIN);
#else
// Make sure initial output state is low
PPM_PORT &= ~(1 << PPM_OUTPUT_PIN);
#endif
// Wait for output pin to settle
//_delay_us( 1 );