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MicroPixel (talk | contribs) Merge text inside some notes into article to make it more legible and update source with neutral terminology |
MicroPixel (talk | contribs) Adding CH341A/B as additional example and mention/link to open source tools flashrom, IMSProg and SNANDer |
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=== 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 or SNANDer.
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 MHz serial interfaces, with virtually unlimited access length.
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