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//! Inlines for Furi HAL GPIO interface.
//! 
//! See: https://github.com/flipperdevices/flipperzero-firmware/blob/release/firmware/targets/f7/furi_hal/furi_hal_gpio.h

use crate as sys;

/// Number of GPIO on one port.
pub const GPIO_NUMBER: usize = 16;

/// GPIO write pin.
#[inline]
pub unsafe extern "C" fn furi_hal_gpio_write(gpio: *const sys::GpioPin, state: bool) {
    let port = (*gpio).port;
    let pin = (*gpio).pin;

    furi_hal_gpio_write_port_pin(port, pin, state)
}

/// GPIO write pin.
#[inline]
pub unsafe extern "C" fn furi_hal_gpio_write_port_pin(port: *mut sys::GPIO_TypeDef, pin: u16, state: bool) {
    // writing to BSSR is an atomic operation
    (*port).BSRR = (pin as u32) << if state { 0 } else { GPIO_NUMBER };
}

/// GPIO read pin.
#[inline]
pub unsafe extern "C" fn furi_hal_gpio_read(gpio: *const sys::GpioPin) -> bool {
    let port = (*gpio).port;
    let pin = (*gpio).pin;

    furi_hal_gpio_read_port_pin(port, pin)
}

/// GPIO read pin.
#[inline]
pub unsafe extern "C" fn furi_hal_gpio_read_port_pin(port: *mut sys::GPIO_TypeDef, pin: u16) -> bool {
    (*port).IDR != 0 && pin != 0x00
}