@qmk.fm
An open source firmware for AVR and ARM based keyboards
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QMK Firmware is a brand that aims to provide users with a completely customizable, powerful, and enjoyable firmware experience for any project, particularly keyboards. They offer a wide range of products and services to cater to the needs of software developers, including an online configurator, documentation, and a toolbox to support the firmware development process. One of their notable products is the Proton C, which is an Arm STM32F303xC based drop-in replacement for the Pro Micro.
It features a 32-bit 72MHz Cortex-M4 processor and various I/O ports such as I2C, SPI, PWM, DMA, DAC, USART, and I2S. With 256kB flash and 40kB RAM, the Proton C provides ample storage space for enabling multiple features without sacrificing performance. However, it is important to note that some PCBs compatible with the Pro Micro have connected (shorted) VCC (3.
3V) and RAW (5V) pins, which can cause damage to the MCU when using the Proton C. Hence, caution is advised when connecting these pins. If you're looking for a highly customizable and powerful firmware solution, QMK Firmware and their Proton C are excellent options that combine performance and versatility
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