micropython/stmhal/mphal.h

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// We use the ST Cube HAL library for most hardware peripherals
#include <stm32f4xx_hal.h>
// Basic GPIO functions
#define GPIO_read_pin(gpio, pin) (((gpio)->IDR >> (pin)) & 1)
#define GPIO_set_pin(gpio, pin_mask) (((gpio)->BSRRL) = (pin_mask))
#define GPIO_clear_pin(gpio, pin_mask) (((gpio)->BSRRH) = (pin_mask))