Light hardware abstraction layer for peripherals. More...

#include <Arduino.h>
#include <SPI.h>
#include <Wire.h>
#include <stdint.h>
#include <stdio.h>
#include <stdarg.h>

Include dependency graph for hV_HAL_Peripherals.h:

This graph shows which files directly or indirectly include this file:

Macros
#define	hV_HAL_PERIPHERALS_RELEASE 1001
	Release.
#define	hV_HAL_Serial Serial
	SDK library.
#define	mySerial hV_HAL_Serial
	Serial port, synonym.
Time
See also https://www.arduino.cc/reference/en/#time
Log system
#define	LOG_TEXT_LENGTH 128
	Buffer size for log messages @detail Recommended 256 for Viewer, 128 otherwise.
#define	LEVEL_CRITICAL 0x0001
	Log level messages.
#define	LEVEL_INFO 0x0008
	. Information
#define	LEVEL_DEBUG 0x0010
	- Debug
#define	LEVEL_SYSTEM 0x0020
	= System

Functions
void	hV_HAL_log (uint16_t level, const char *format,...)
	Send debug message to console.
General
void	hV_HAL_begin ()
	General initialisation.
void	hV_HAL_exit (uint8_t code=0)
	General exit.
Serial console
Formatted output to hV_HAL_Serial Note Console already initialised at 115200 by hV_HAL_begin() (6.0.7)
void	hV_HAL_Serial_printf (const char *format,...)
	Format and send to console.
void	hV_HAL_Serial_crlf (void)
	Print carriage-return line-feed.
SPI bus
Warning SPI.begin() Arduino: no parameters ESP32: required parameters for SCK, MOSI and MISO
void	hV_HAL_SPI_begin (uint32_t speed=8000000)
	Configure and start SPI.
void	hV_HAL_SPI_end ()
	End SPI.
uint8_t	hV_HAL_SPI_transfer (uint8_t data)
	Combined write and read of a single byte.
3-wire SPI
void	hV_HAL_SPI3_begin ()
	Configure 3-wire SPI.
void	hV_HAL_SPI3_end ()
	End 3-wire SPI.
void	hV_HAL_SPI3_define (uint8_t pinClock=SCK, uint8_t pinData=MOSI)
	Set the 3-wire SPI pins.
uint8_t	hV_HAL_SPI3_read ()
	Read a single byte.
void	hV_HAL_SPI3_write (uint8_t value)
	Write a single byte.
Wire bus
void	hV_HAL_Wire_begin ()
	Configure and start Wire bus.
void	hV_HAL_Wire_end ()
	End Wire bus.
uint8_t	hV_HAL_Wire_transfer (uint8_t address, uint8_t dataWrite, size_t sizeWrite, uint8_t dataRead=0, size_t sizeRead=0, uint32_t us=0)
	Combined write and read with optional delay.

GPIO
Warning Arduino: GPIO requires pin number, example 4 Mbed: GPIO requires pin name, example D4 or PB_5 Mbed: GPIO is created at call Mbed: GPIO not suitable for interrupts Viewer: For compatibility only, GPIO not implemented in Linux
#define	hV_HAL_GPIO_define(X, Y)
	Undefine GPIO.
#define	hV_HAL_GPIO_set(X)
	Undefine GPIO.
#define	hV_HAL_GPIO_clear(X)
	Undefine GPIO.
#define	hV_HAL_GPIO_get(X)
	Undefine GPIO.
#define	hV_HAL_GPIO_write(X, Y)
	Undefine GPIO.
#define	hV_HAL_GPIO_read(X)
	Undefine GPIO.
void	hV_HAL_GPIO_begin (void)
	Undefine GPIO.
void	hV_HAL_GPIO_undefine (uint8_t pin)
	Undefine GPIO.
void	hV_HAL_GPIO_waitFor (uint8_t pin, uint8_t state)
	Wait for GPIO.

Miscellaneous
#define	hV_HAL_min(a, b)
	Minimum of two numbers.
#define	hV_HAL_max(a, b)
	Maximum of two numbers.
#define	hV_HAL_swap(x, y)
	Swap numbers.
long	hV_HAL_map (long x, long in_min, long in_max, long out_min, long out_max)
	Rescale a value.

Detailed Description

Light hardware abstraction layer for peripherals.

Based on highView technology

Date: 21 Dec 2025

Version: 1001

Copyright: (c) Pervasive Displays Inc., 2021-2026; (c) Etigues, 2010-2026; All rights reserved; For exclusive use with Pervasive Displays screens

Basic edition: for hobbyists and for basic usage
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
See also
https://creativecommons.org/licenses/by-sa/4.0/

Consider the Evaluation or Commercial editions for professionals or organisations and for commercial usage
Evaluation edition: for professionals or organisations, evaluation only, no commercial usage
All rights reserved
Commercial edition: for professionals or organisations, commercial usage
All rights reserved
Viewer edition: for professionals or organisations
All rights reserved
Documentation
All rights reserved

Macro Definition Documentation

◆ hV_HAL_GPIO_clear

#define hV_HAL_GPIO_clear ( X )

Value:

(digitalWrite(X, LOW))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_define

#define hV_HAL_GPIO_define	(		X,
			Y )

Value:

(pinMode(X, Y))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_get

#define hV_HAL_GPIO_get ( X )

Value:

(digitalRead(X))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_read

#define hV_HAL_GPIO_read ( X )

Value:

(digitalRead(X))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_set

#define hV_HAL_GPIO_set ( X )

Value:

(digitalWrite(X, HIGH))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_write

#define hV_HAL_GPIO_write	(		X,
			Y )

Value:

(digitalWrite(X, Y))

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_max

#define hV_HAL_max	(		a,
			b )

Value:

((a) > (b) ? (a) : (b))

Maximum of two numbers.

Parameters

a	first number
b	second number

Returns: maximum of a and b

Note: Macro more robust than bugged implementation on some platforms

◆ hV_HAL_min

#define hV_HAL_min	(		a,
			b )

Value:

((a) < (b) ? (a) : (b))

Minimum of two numbers.

Parameters

a	first number
b	second number

Returns: minimum of a and b

Note: Macro more robust than bugged implementation on some platforms

◆ hV_HAL_PERIPHERALS_RELEASE

#define hV_HAL_PERIPHERALS_RELEASE 1001

Release.

Deprecated

Removed synonyms for GPIO (7.0.0)

hV_HAL_GPIO_pinMode() is removed. Use hV_HAL_GPIO_define() instead (7.0.0)
hV_HAL_GPIO_digitalWrite() is removed. Use hV_HAL_GPIO_write(), hV_HAL_GPIO_set() and hV_HAL_GPIO_clear() instead (7.0.0)
hV_HAL_GPIO_digitalRead() is removed. Use hV_HAL_GPIO_read() or hV_HAL_GPIO_get() instead (7.0.0)

Deprecated

Removed synonyms for Time (7.0.0)

hV_HAL_delay() is removed. Use hV_HAL_delayMilliseconds() instead (7.0.0)

Deprecated

Removed synonyms for Serial (7.0.0)

hV_HAL_printf() is removed. Use hV_HAL_Serial_printf() instead (7.0.0)
hV_HAL_crlf() is removed. Use hV_HAL_Serial_crlf() instead (7.0.0)
hV_HAL_Serial_print() and hV_HAL_Serial_println() are not recommended. Use hV_HAL_Serial_printf() and hV_HAL_Serial_crlf() instead (7.0.0)

Deprecated

Removed synonyms for SPI (7.0.0)

hV_HAL_SPI_configure() is removed. Use hV_HAL_SPI_begin() instead (7.0.0)

Deprecated

Removed synonyms for Wire (7.0.0)

hV_HAL_Wire_writeRead() is removed. Use hV_HAL_Wire_transfer() instead (7.0.0)

Deprecated

Removed hV_HAL_Serial_print() and hV_HAL_Serial_println() (10.0.0)

Use hV_HAL_Serial_printf() and hV_HAL_Serial_crlf() instead (10.0.0)

◆ hV_HAL_Serial

#define hV_HAL_Serial Serial

SDK library.

See also

References

Arduino SDK https://www.arduino.cc/reference/en/
Energia SDK https://energia.nu/reference/

SDK other libraries

Other libraries

Serial port

Serial or Serial1

◆ hV_HAL_swap

#define hV_HAL_swap	(		x,
			y )

Value:

do { __typeof__(x) WORK = x; x = y; y = WORK; } while (0)

Swap numbers.

Parameters

[out]	x	first number
[out]	y	second number

Note: Macro more robust than template for some platforms

template <typename T> T
hV_HAL_swap(T &x, T &y)
{
    T w = x;
    x = y;
    y = w;
}

Note: __typeof__ recommended over typeof

◆ LEVEL_CRITICAL

#define LEVEL_CRITICAL 0x0001

Log level messages.

* Non-handled error, stop or exit

Function Documentation

◆ hV_HAL_begin()

void hV_HAL_begin ( )

General initialisation.

hV_HAL_Serial initialised at hV_HAL_Serial_Speed

◆ hV_HAL_exit()

void hV_HAL_exit ( uint8_t code = 0 )

General exit.

Parameters

code	default = 0 = success, otherwise error

Note: Only used on Linux

◆ hV_HAL_GPIO_begin()

void hV_HAL_GPIO_begin ( void )

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_undefine()

void hV_HAL_GPIO_undefine ( uint8_t pin )

Undefine GPIO.

Parameters

pin	pin number or pin name according to SDK

◆ hV_HAL_GPIO_waitFor()

void hV_HAL_GPIO_waitFor	(	uint8_t	pin,
		uint8_t	state )

Wait for GPIO.

Parameters

pin	pin number or pin name according to SDK
state	HIGH or LOW

◆ hV_HAL_log()

void hV_HAL_log	(	uint16_t	level,
		const char *	format,
			... )

Send debug message to console.

Parameters

level	Debug level message
format	see https://www.cplusplus.com/reference/cstdio/printf/ for tokens

Note: With final CR-LF

◆ hV_HAL_map()

long hV_HAL_map	(	long	x,
		long	in_min,
		long	in_max,
		long	out_min,
		long	out_max )

Rescale a value.

Parameters

x	input value
in_min	minimal input value
in_max	maximum input value
out_min	minimum output value
out_max	maximum output value

Returns: long output value

Note: Formula is
(x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;

◆ hV_HAL_Serial_printf()

void hV_HAL_Serial_printf	(	const char *	format,
			... )

Format and send to console.

Parameters

format	see https://www.cplusplus.com/reference/cstdio/printf/ for tokens
args	explicit variadic list required for hV_HAL_Serial_printf()

◆ hV_HAL_SPI3_begin()

void hV_HAL_SPI3_begin ( )

Configure 3-wire SPI.

Note: Select default SCK as clock and MOSI as data (SDIO)

◆ hV_HAL_SPI3_define()

void hV_HAL_SPI3_define	(	uint8_t	pinClock = SCK,
		uint8_t	pinData = MOSI )

Set the 3-wire SPI pins.

Parameters

pinClock	clock, default = SCK
pinData	combined data, default = MOSI

Note: For manual configuration only

Warning

SCK and MOSI provided by Arduino SDK

Some boards require manual configuration

◆ hV_HAL_SPI3_end()

void hV_HAL_SPI3_end ( )

End 3-wire SPI.

Warning: Some platforms require freeing the GPIOs used by 3-wire SPI before starting SPI.

◆ hV_HAL_SPI3_read()

uint8_t hV_HAL_SPI3_read ( )

Read a single byte.

Returns: read byte

Note: Configure the clock pin as output and data pin as input.

Warning: /CS to be managed externally.

◆ hV_HAL_SPI3_write()

void hV_HAL_SPI3_write ( uint8_t value )

Write a single byte.

Parameters

data byte

Note: Configure the clock and data pins as output.

Warning: /CS to be managed externally.

◆ hV_HAL_SPI_begin()

void hV_HAL_SPI_begin ( uint32_t speed = 8000000 )

Configure and start SPI.

Parameters

speed SPI speed in Hz, 8000000 = default

Note

Other parameters are

Bit order: MSBFIRST
Data mode: SPI_MODE0

With check for unique initialisation

◆ hV_HAL_SPI_end()

void hV_HAL_SPI_end ( )

End SPI.

Note: With check for unique deinitialisation

◆ hV_HAL_SPI_transfer()

uint8_t hV_HAL_SPI_transfer ( uint8_t data )

Combined write and read of a single byte.

Parameters

data byte

Returns: read byte

Warning: No check for previous initialisation

◆ hV_HAL_Wire_begin()

void hV_HAL_Wire_begin ( )

Configure and start Wire bus.

Note: Master mode only; With check for unique initialisation

◆ hV_HAL_Wire_end()

void hV_HAL_Wire_end ( )

End Wire bus.

Note: With check for unique deinitialisation

◆ hV_HAL_Wire_transfer()

uint8_t hV_HAL_Wire_transfer	(	uint8_t	address,
		uint8_t *	dataWrite,
		size_t	sizeWrite,
		uint8_t *	dataRead = 0,
		size_t	sizeRead = 0,
		uint32_t	us = 0 )

Combined write and read with optional delay.

Parameters

[in]	address	I2C device address
[in]	dataWrite	buffer to write
[in]	sizeWrite	number of bytes
[out]	dataRead	buffer to read
[in]	sizeRead	number of bytes
[in]	us	delay in microseconds, default = 0 = no delay

Returns: uint8_t transmission status, RESULT_SUCCESS = 0 or RESULT_ERROR = 1

Note: If sizeRead = 0, no read performed

Warning: No check for previous initialisation

Macros

Functions

GPIO

Miscellaneous

Detailed Description

Macro Definition Documentation

◆ hV_HAL_GPIO_clear

◆ hV_HAL_GPIO_define

◆ hV_HAL_GPIO_get

◆ hV_HAL_GPIO_read

◆ hV_HAL_GPIO_set

◆ hV_HAL_GPIO_write

◆ hV_HAL_max

◆ hV_HAL_min

◆ hV_HAL_PERIPHERALS_RELEASE

◆ hV_HAL_Serial

◆ hV_HAL_swap

◆ LEVEL_CRITICAL

Function Documentation

◆ hV_HAL_begin()

◆ hV_HAL_exit()

◆ hV_HAL_GPIO_begin()

◆ hV_HAL_GPIO_undefine()

◆ hV_HAL_GPIO_waitFor()

◆ hV_HAL_log()

◆ hV_HAL_map()

◆ hV_HAL_Serial_printf()

◆ hV_HAL_SPI3_begin()

◆ hV_HAL_SPI3_define()

◆ hV_HAL_SPI3_end()

◆ hV_HAL_SPI3_read()

◆ hV_HAL_SPI3_write()

◆ hV_HAL_SPI_begin()

◆ hV_HAL_SPI_end()

◆ hV_HAL_SPI_transfer()

◆ hV_HAL_Wire_begin()

◆ hV_HAL_Wire_end()

◆ hV_HAL_Wire_transfer()