Embedded STM32F1 GPIO - JohnHau/mis GitHub Wiki

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https://www.[kernel.org/doc/Documentation/devicetree/bindings/pinctrl/st%2Cstm32-pinctrl.txt](https://www.kernel.org/doc/Documentation/devicetree/bindings/pinctrl/st%2Cstm32-pinctrl.txt)

https://www.digi.com/resources/documentation/digidocs/embedded/dey/4.0/ccmp15/bsp_r_gpio_ccmp1.html