ardupilot/libraries/AP_HAL_Linux/GPIO_Sysfs.h

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#pragma once
#include <AP_HAL/AP_HAL.h>
#if CONFIG_HAL_BOARD == HAL_BOARD_LINUX
#include "AP_HAL_Linux.h"
#include "GPIO.h"
class Linux::DigitalSource_Sysfs : public AP_HAL::DigitalSource {
friend class Linux::GPIO_Sysfs;
public:
~DigitalSource_Sysfs();
uint8_t read();
void write(uint8_t value);
void mode(uint8_t output);
void toggle();
private:
/* Only GPIO_Sysfs will be able to instantiate */
DigitalSource_Sysfs(unsigned pin, int value_fd);
int _value_fd;
unsigned _pin;
};
/**
* Generic implementation of AP_HAL::GPIO for Linux based boards.
*/
class Linux::GPIO_Sysfs : public AP_HAL::GPIO {
friend class Linux::DigitalSource_Sysfs;
public:
/* Fill this table with the real pin numbers. */
static const unsigned pin_table[];
static const uint8_t n_pins;
static GPIO_Sysfs *from(AP_HAL::GPIO *gpio) {
return static_cast<GPIO_Sysfs*>(gpio);
}
void init();
void pinMode(uint8_t vpin, uint8_t output) override;
uint8_t read(uint8_t vpin) override;
void write(uint8_t vpin, uint8_t value) override;
void toggle(uint8_t vpin) override;
/*
* Export pin, instantiate a new DigitalSource_Sysfs and return its
* pointer.
*/
AP_HAL::DigitalSource *channel(uint16_t vpin) override;
/*
* Currently this function always returns -1.
*/
int8_t analogPinToDigitalPin(uint8_t vpin) override;
/*
* Currently this function always returns false.
*/
bool attach_interrupt(uint8_t interrupt_num, AP_HAL::Proc p, uint8_t mode) override;
/*
* Currently this function always returns false.
*/
bool usb_connected() override;
protected:
void _pinMode(unsigned int pin, uint8_t output);
int _open_pin_value(unsigned int pin, int flags);
/*
* Make pin available for use. This function should be called before
* calling functions that use the pin number as parameter.
*
* Returns true if pin is exported successfully and false otherwise.
*
* Note: the pin is ignored if already exported.
*/
static bool _export_pin(uint8_t vpin);
};
#endif