tasoft/php-spi-extension

A simple SPI extension for PHP to read from and write to the spi bus.

v0.8.0 2022-03-31 14:55 UTC

Requires

• php: >=7.2

MIT

• thomas

README

I've created this extension to get access to the spi bus on my raspberry pi.

Installation

$ cd ~
$ git clone https://github.com/tasoftch/php-spi-extension.git
$ cd php-spi-extension
$ phpize
$ ./configure --enable-php-spi
$ make
$ sudo make install

This compiles the source on your machine.
Next find the php.ini file

$ php --ini

Will list scanned ini files.
Add the following line to that php.ini file: extension=php_spi

<?php
var_dump( extension_loaded('php_spi') ); // Should be true

Usage

The extension adds the following functions to the global scope:

1. spi_open
   This opens the device bus.
2. spi_read
   Reads data from the spi bus.
3. spi_write
   Writes data to the spi bus
4. spi_transfer
   Reads and writes data to and from the spi bus in duplex mode
5. spi_close
   Closes the bus.
6. spi_get_mode
   Reads the mode
7. spi_get_speed
   Reads the maximum speed
8. spi_get_bits_per_word
   Reads bits per word
9. spi_get_delay
   Reads the delay

Example

<?php
use TASoft\Bus\SPI;

$dev = new SPI(0); // /dev/spidev0.0
$backData = $dev->transfer([0x0, 0xFF]);
print_r($backData);
?>