Esp32HardwareI2C.hxx

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#ifndef _FREERTOS_DRIVERS_ESP32_ESP32HARDWAREI2C_HXX_
#define _FREERTOS_DRIVERS_ESP32_ESP32HARDWAREI2C_HXX_
 
#include "i2c.h"
#include "i2c-dev.h"
#include <unistd.h>
#include <driver/i2c.h>
#include <hal/gpio_types.h>
#include <utils/Atomic.hxx>
#include <vector>
 
namespace openmrn_arduino
{
 
class Esp32HardwareI2C : private Atomic
{
public:
    Esp32HardwareI2C(const char * const path = "/dev/i2c");
 
    ~Esp32HardwareI2C();
 
    void hw_init(const gpio_num_t sda, const gpio_num_t scl,
                 const uint32_t bus_speed, const i2c_port_t port = I2C_NUM_0);
 
    void scan(const i2c_port_t port);
 
    ssize_t write(int fd, const void *buf, size_t size);
 
    ssize_t read(int fd, void *buf, size_t size);
 
    int open(const char *path, int flags, int mode);
 
    int close(int fd);
 
    int ioctl(int fd, int cmd, va_list args);
 
private:
    const char * const path_;
 
    static constexpr TickType_t I2C_OP_TIMEOUT = pdMS_TO_TICKS(1000);
 
    static constexpr TickType_t I2C_SCAN_TIMEOUT = pdMS_TO_TICKS(50);
 
    static constexpr int I2C_ISR_FLAGS = ESP_INTR_FLAG_SHARED;
 
    static constexpr size_t I2C_SLAVE_RX_BUF_SIZE = 0;
 
    static constexpr size_t I2C_SLAVE_TX_BUF_SIZE = 0;
 
    struct i2c_device_t
    {
        i2c_port_t port;
 
        int address;
 
        int fd;
    };
 
    std::vector<i2c_device_t> devices_;
 
    bool i2cInitialized_[SOC_I2C_NUM];
 
    bool vfsInitialized_{false};
 
    int transfer_messages(const i2c_port_t port, struct i2c_msg *msgs, int num);
};
 
}; // namespace openmrn_arduino
 
using openmrn_arduino::Esp32HardwareI2C;
 
#endif // _FREERTOS_DRIVERS_ESP32_ESP32HARDWAREI2C_HXX_