93 lines
3.0 KiB
C++
93 lines
3.0 KiB
C++
#ifndef LINUX_GPIO_GPIODEFINITIONS_H_
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#define LINUX_GPIO_GPIODEFINITIONS_H_
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#include <string>
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#include <unordered_map>
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using gpioId_t = uint16_t;
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namespace gpio {
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enum Direction {
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IN = 0,
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OUT = 1
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};
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enum GpioOperation {
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READ,
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WRITE
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};
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enum GpioTypes {
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NONE,
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GPIOD_REGULAR,
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CALLBACK
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};
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static constexpr gpioId_t NO_GPIO = -1;
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}
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/**
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* @brief Struct containing information about the GPIO to use. This is
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* required by the libgpiod to access and drive a GPIO.
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* @param chipname String of the chipname specifying the group which contains the GPIO to
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* access. E.g. gpiochip0. To detect names of GPIO groups run gpiodetect on
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* the linux command line.
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* @param lineNum The offset of the GPIO within the GPIO group.
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* @param consumer Name of the consumer. Simply a description of the GPIO configuration.
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* @param direction Specifies whether the GPIO should be used as in- or output.
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* @param initValue Defines the initial state of the GPIO when configured as output.
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* Only required for output GPIOs.
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* @param lineHandle The handle returned by gpiod_chip_get_line will be later written to this
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* pointer.
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*/
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class GpioBase {
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public:
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GpioBase() = default;
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GpioBase(gpio::GpioTypes gpioType, std::string consumer, gpio::Direction direction,
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int initValue):
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gpioType(gpioType), consumer(consumer),direction(direction), initValue(initValue) {}
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virtual~ GpioBase() {};
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/* Can be used to cast GpioBase to a concrete child implementation */
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gpio::GpioTypes gpioType = gpio::GpioTypes::NONE;
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std::string consumer;
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gpio::Direction direction = gpio::Direction::IN;
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int initValue = 0;
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};
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class GpiodRegular: public GpioBase {
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public:
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GpiodRegular(): GpioBase(gpio::GpioTypes::GPIOD_REGULAR, std::string(),
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gpio::Direction::IN, 0) {};
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GpiodRegular(std::string chipname_, int lineNum_, std::string consumer_,
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gpio::Direction direction_, int initValue_):
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GpioBase(gpio::GpioTypes::GPIOD_REGULAR, consumer_, direction_, initValue_),
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chipname(chipname_), lineNum(lineNum_) {}
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std::string chipname;
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int lineNum = 0;
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struct gpiod_line* lineHandle = nullptr;
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};
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class GpioCallback: public GpioBase {
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public:
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GpioCallback(std::string consumer, gpio::Direction direction_, int initValue_,
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void (* callback) (gpioId_t gpioId, gpio::GpioOperation gpioOp, int value, void* args),
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void* callbackArgs):
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GpioBase(gpio::GpioTypes::CALLBACK, consumer, direction_, initValue_),
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callback(callback), callbackArgs(callbackArgs) {}
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void (* callback) (gpioId_t gpioId, gpio::GpioOperation gpioOp,
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int value, void* args) = nullptr;
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void* callbackArgs = nullptr;
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};
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using GpioMap = std::unordered_map<gpioId_t, GpioBase*>;
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using GpioMapIter = GpioMap::iterator;
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#endif /* LINUX_GPIO_GPIODEFINITIONS_H_ */
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