Editing Serial Peripheral Interface (section)

==Development tools==

=== Single-board computers ===
[[Single-board computers]] may provide [[Lead (electronics)|pin]] access to SPI hardware units. For instance, the [[Raspberry Pi#J8 header and general purpose input-output (GPIO)|Raspberry Pi's J8 header]] exposes at least two SPI units that can be used via [[Linux]] [[Device driver|drivers]] or [[Python (programming language)|python]].

=== USB to SPI adapters ===
There are a number of [[USB]] adapters that allow a desktop [[Personal computer|PC]] or [[smartphone]] with [[USB]] to communicate with SPI chips (e.g. CH341A/B<ref>{{cite web |title=USB Bridge Controller CH341 with UART, SPI and I2C | url=https://wch-ic.com/products/CH341.html |access-date=27 February 2025 |website=WCH}}</ref> based or [[FTDI|FT]]221xs<ref>{{cite web |title=USB to SPI converter |url=https://ftdichip.com/products/ft221xs/ |access-date=14 February 2021 |website=FTDI|date=2 August 2020 }}</ref>). They are used for embedded systems, chips ([[FPGA]], [[Application-specific integrated circuit|ASIC]], and [[System on a chip|SoC]]) and peripheral testing, programming and debugging. Many of them also provide scripting or programming capabilities (e.g. [[Visual Basic]], [[C (programming language)|C]]/[[C++]], [[VHDL]]) and can be used with open source programs like [[Flashrom_(utility)|flashrom]], IMSProg, SNANDer or avrdude for [[Flash_memory|flash]], [[EEPROM]], [[Bootloader|bootloader]] and [[BIOS]] programming.

The key SPI parameters are: the maximum supported frequency for the serial interface, command-to-command latency, and the maximum length for SPI commands. It is possible to find SPI adapters on the market today that support up to 100&nbsp;MHz serial interfaces, with virtually unlimited access length.

SPI protocol being a de facto standard, some SPI host adapters also have the ability of supporting other protocols beyond the traditional 4-wire SPI (for example, support of quad-SPI protocol or other custom serial protocol that derive from SPI<ref>[https://www.byteparadigm.com/product-spi-storm-39.html SPI Storm – Serial Protocol Host Adapter] with support of custom serial protocols, Byte Paradigm.</ref>).

===Protocol analyzers===
{{Main articles|Logic analyzer}}
[[Logic analyzers]] are tools which collect, [[timestamp]], analyze, decode, store, and view the high-speed waveforms, to help [[Debugging|debug]] and develop. Most logic analyzers have the capability to decode SPI bus signals into high-level protocol data with human-readable labels.

==== Oscilloscopes ====
SPI [[waveforms]] can be seen on [[Analog signal|analog]] channels (and/or via [[Digital signal|digital]] channels in [[Oscilloscope#Mixed-signal oscilloscope|mixed-signal oscilloscopes]]).<ref>{{cite web |title=N5391B I²C and SPI Protocol Triggering and Decode for Infiniium scopes |url=https://www.keysight.com/en/pd-1646694-pn-N5391B/ic-and-spi-protocol-triggering-and-decode?cc=US&lc=eng}}</ref> Most [[oscilloscope]] vendors offer optional support for SPI protocol analysis (both 2-, [[Serial Peripheral Interface#Three-wire|3-]], and 4-wire SPI) with triggering.