BrakePressure.c File Reference

#include "../../../Inc/Sensors/AnalogSensors/BrakePressure.h"
#include "../../../Inc/Utils/MessageFormat.h"
#include "../../../Inc/Utils/Telemetry.h"
#include <stdio.h>

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Functions
void	initBrakePressure (BrakePressure *bp, int hz, int channel, char *name)
	Initializes the BrakePressure sensor with the given frequency and channel. More...
float	getBrakePressure (BrakePressure *bp)
	Gets the current brake pressure. More...
void	updateBrakePressure (void *bp)
	Updates the brake pressure data. More...
float	transferFunctionBrakePressure (float rawVal)
	Converts raw brake pressure data to a meaningful pressure value. More...

Variables
static const float	kOffsetVoltage = 0.5
static const float	kVoltsPerPSIA = 0.002
static const float	kLowOutputSaturation = 0.45
static const float	kHighOutputSaturation = 4.65

Function Documentation

getBrakePressure()

float getBrakePressure

(

BrakePressure *

bp

)

Gets the current brake pressure.

Parameters

bp	Pointer to the BrakePressure structure to query.

Returns

The current brake pressure.

Definition at line 23 of file BrakePressure.c.

                                          {
    return bp->pressure;
}

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initBrakePressure()

void initBrakePressure	(	BrakePressure *	bp,
		int	hz,
		int	channel,
		char *	name
	)

Initializes the BrakePressure sensor with the given frequency and channel.

Parameters

bp	Pointer to the BrakePressure structure to initialize.
hz	The frequency in Hertz at which the sensor operates.
channel	The analog channel the sensor is connected to.
name	The name of the sensor (default is "BrakePressure").

Definition at line 13 of file BrakePressure.c.

                                                                           {
    initAnalogSensor(&bp->base, name, hz, channel, bp);
    bp->pressure = -1;
    bp->base.sensor.updateable.update = updateBrakePressure;
 
    // Setup telemetry signals
    bp->telem_raw = registerTelemetrySignal(name, TELEMETRY_SENSOR, UNIT_VOLTS, 1000/hz, 0.4f, 4.7f);
    bp->telem_psi = registerTelemetrySignal(name, TELEMETRY_SENSOR, UNIT_PSI, 1000/hz, 0.0f, 2000.0f);
}

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transferFunctionBrakePressure()

float transferFunctionBrakePressure

(

float

rawVal

)

Converts raw brake pressure data to a meaningful pressure value.

Parameters

rawVal

The raw data from the brake pressure sensor.

Returns

The converted brake pressure value.

Definition at line 46 of file BrakePressure.c.

                                                  {
    if (rawVal < kLowOutputSaturation) {
        return -1;
    }
    else if (rawVal > kHighOutputSaturation) {
        return 2001;
    }
    else {
        return ((rawVal - kOffsetVoltage) / kVoltsPerPSIA);
    }
}

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updateBrakePressure()

void updateBrakePressure

(

void *

bp

)

Updates the brake pressure data.

Parameters

bp	Pointer to the BrakePressure structure to update.

Definition at line 27 of file BrakePressure.c.

                                   {
    BrakePressure *brakePressure = (BrakePressure *)bp;
    float rawData = getAnalogSensorData(&brakePressure->base);
 
    // Send Telemetry float
    sendTelemetryValue(brakePressure->telem_raw, rawData);
 
    brakePressure->pressure = transferFunctionBrakePressure(rawData);
    if (brakePressure->pressure == -1) {
        sendMessage(brakePressure->base.sensor.updateable.name, MSG_WARNING, 
                   "Brake pressure reading below sensor minimum (%.3f V)", rawData);
    } else if (brakePressure->pressure == 2001) {
        sendMessage(brakePressure->base.sensor.updateable.name, MSG_WARNING, 
                   "Brake pressure reading above sensor maximum (%.3f V)", rawData);
    }
    
    sendTelemetryValue(brakePressure->telem_psi, brakePressure->pressure);
}

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Variable Documentation

kHighOutputSaturation

const float kHighOutputSaturation = 4.65

static

Definition at line 11 of file BrakePressure.c.

kLowOutputSaturation

const float kLowOutputSaturation = 0.45

static

Definition at line 10 of file BrakePressure.c.

kOffsetVoltage

const float kOffsetVoltage = 0.5

static

Definition at line 8 of file BrakePressure.c.

kVoltsPerPSIA

const float kVoltsPerPSIA = 0.002

static

Definition at line 9 of file BrakePressure.c.