ultrasonic.c File Reference

Driver code for the ultrasonic sensor. More...

#include <stdbool.h>
#include <stdint.h>
#include <sys/cdefs.h>
#include "pico/time.h"
#include "pico/types.h"
#include "hardware/gpio.h"
#include "ultrasonic/ultrasonic.h"

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Functions
uint64_t	ultrasonic_get_cm (uint trig_pin, uint echo_pin)
	Get the distance to an object in centimetres. More...
uint64_t	ultrasonic_get_in (uint trig_pin, uint echo_pin)
	Get the distance to an object in inches. More...
void	ultrasonic_init_pins (uint trig_pin, uint echo_pin)
	Initalises the pins for the ultrasonic sensor. More...

Detailed Description

Driver code for the ultrasonic sensor.

Author

Ang Jia Yu

Version

0.1

Date

2023-10-29

Copyright

Copyright (c) 2023

Function Documentation

ultrasonic_get_cm()

uint64_t ultrasonic_get_cm	(	uint	trig_pin,
		uint	echo_pin
	)

Get the distance to an object in centimetres.

Parameters

[in]	trig_pin	Trigger pin for the ultrasonic sensor.
[in]	echo_pin	Echo pin for the ultrasonic sensor.

Returns

uint64_t The distance to an object in centimetres.

References ULTRASONIC_PULSE_TO_CM.

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ultrasonic_get_in()

uint64_t ultrasonic_get_in	(	uint	trig_pin,
		uint	echo_pin
	)

Get the distance to an object in inches.

Parameters

[in]	trig_pin	Trigger pin for the ultrasonic sensor.
[in]	echo_pin	Echo pin for the ultrasonic sensor.

Returns

uint64_t The distance to an object in inches.

References ULTRASONIC_PULSE_TO_IN.

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ultrasonic_init_pins()

void ultrasonic_init_pins	(	uint	trig_pin,
		uint	echo_pin
	)

Initalises the pins for the ultrasonic sensor.

Parameters

[in]	trig_pin	Trigger pin for the ultrasonic sensor.
[in]	echo_pin	Echo pin for the ultrasonic sensor.

Initialises the trigger and echo pins, and sets a ISR on the echo pin to

measure the pulse width.

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