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Devantect USB to I2C, SPI and Serial interface - RobotShop
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UTS2210 USB to SPI SPI Master HID device MCP2210/ | eBay
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DEV-SYS-1808-1A Qualcomm | RF and Wireless | DigiKey
CSR USB SPI Programmer,USB-to-SPI Converter For Debug Manufacturers and Suppliers - Wholesale Products - FEASYCOM
DLN-4S Multiprotocol Master & Slave Adapter
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PC-I2C/SPI/GPIO/ADC/PWM Adapter with USB interface
USB SPI Slave Breakout Board from Earth People Technology on Tindie
USB Port Converter Module, USB To UART IIC SPI TTL ISP EPP MEM CH341A Chip USB Serial Port Adapter With Working Status Indicator For Program Debugging - Walmart.com
USB to SPI breakout board using MCP2210 (Part 1) - YouTube
CH341A USB to I2C / IIC / SPI / UART / TTL / ISP adapter EPP / MEM parallel port converter - AliExpress
CSR USB-SPI programmer
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