ppm.c File Reference

Architecture independent functions for PPM radio control. More...

#include "modules/radio_control/radio_control.h"
#include "modules/radio_control/ppm.h"
#include "modules/core/abi.h"
#include "modules/datalink/telemetry.h"

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Macros
#define	RssiValid()   TRUE
	RssiValid test macro. More...

Functions
static void	send_ppm (struct transport_tx *trans, struct link_device *dev)
void	ppm_init (void)
	RC init function. More...
void	ppm_event (void)
	RC event function. More...
void	ppm_decode_frame (uint32_t ppm_time)
	Decode a PPM frame from global timer value. More...
void	ppm_decode_frame_width (uint32_t ppm_width)
	Decode a PPM frame from last width. More...

Variables
uint16_t	ppm_pulses [RADIO_CTL_NB]
volatile bool	ppm_frame_available
static uint8_t	ppm_cur_pulse
static uint32_t	ppm_last_pulse_time
static bool	ppm_data_valid

Detailed Description

Architecture independent functions for PPM radio control.

Definition in file ppm.c.

Macro Definition Documentation

RssiValid

#define RssiValid

(

)

TRUE

RssiValid test macro.

This macro has to be defined to test the validity of ppm frame from an other source (ex: GPIO). By default, always true.

Definition at line 53 of file ppm.c.

Function Documentation

ppm_decode_frame()

void ppm_decode_frame

(

uint32_t

ppm_time

)

Decode a PPM frame from global timer value.

A valid ppm frame:

• synchro blank
• correct number of channels
• synchro blank

Definition at line 105 of file ppm.c.

References ppm_decode_frame_width(), and ppm_last_pulse_time.

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ppm_decode_frame_width()

void ppm_decode_frame_width

(

uint32_t

ppm_width

)

Decode a PPM frame from last width.

A valid ppm frame:

• synchro blank
• correct number of channels
• synchro blank

Definition at line 120 of file ppm.c.

References ppm_cur_pulse, ppm_data_valid, ppm_frame_available, ppm_pulses, RC_PPM_TICKS_OF_USEC, and RssiValid.

Referenced by icuperiodcb(), and ppm_decode_frame().

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ppm_event()

void ppm_event

(

void

)

RC event function.

PPM frames are normalized using the IIR filter.

Definition at line 86 of file ppm.c.

References RadioControl::frame_cpt, ppm_frame_available, ppm_pulses, radio_control, RADIO_CONTROL_PPM_ID, RadioControl::radio_ok_cpt, RC_OK, RadioControl::status, and RadioControl::time_since_last_frame.

ppm_init()

void ppm_init

(

void

)

RC init function.

Definition at line 71 of file ppm.c.

References DefaultPeriodic, RadioControl::nb_channel, ppm_arch_init(), ppm_cur_pulse, ppm_data_valid, ppm_frame_available, ppm_last_pulse_time, radio_control, register_periodic_telemetry(), and send_ppm().

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send_ppm()

static void send_ppm ( struct transport_tx *  trans, struct link_device *  dev  )

static

Definition at line 60 of file ppm.c.

References dev, RadioControl::frame_rate, ppm_pulses, radio_control, and USEC_OF_RC_PPM_TICKS.

Referenced by ppm_init().

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Variable Documentation

ppm_cur_pulse

uint8_t ppm_cur_pulse

static

Definition at line 42 of file ppm.c.

Referenced by ppm_decode_frame_width(), and ppm_init().

ppm_data_valid

bool ppm_data_valid

static

Definition at line 44 of file ppm.c.

Referenced by ppm_decode_frame_width(), and ppm_init().

ppm_frame_available

volatile bool ppm_frame_available

Definition at line 37 of file ppm.c.

Referenced by ppm_decode_frame_width(), ppm_event(), ppm_init(), and radio_control_feed().

ppm_last_pulse_time

uint32_t ppm_last_pulse_time

static

Definition at line 43 of file ppm.c.

Referenced by ppm_decode_frame(), and ppm_init().

ppm_pulses

uint16_t ppm_pulses[RADIO_CTL_NB]

Definition at line 36 of file ppm.c.

Referenced by ppm_decode_frame_width(), ppm_event(), radio_control_feed(), and send_ppm().