i2c.h

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#pragma once
#include <utils/queue.h>
#include <utils/deadline.h>
 
#include "gpio.h"
#include "registry.h"
namespace I2C {
class Request; //< forward declaration
struct Device {
    Sink<Request> &bus;
    const uint8_t address;
    Device(Sink<Request> &bus, uint8_t address) : bus(bus), address(address) {}
    virtual void callback(const Request &req)=0;
};
 
struct Request {
    Device *dev; 
    Buffer<uint8_t> data; 
    union Type {
        struct {
        uint8_t read:1; 
        uint8_t slave:1; 
        uint8_t mem:1; 
        };
        enum {
            MASTER_WRITE,
            MASTER_READ,
            SLAVE_WRITE,
            SLAVE_READ,
            MEM_WRITE,
            MEM_READ,
        } type;
    } opts; 
    uint8_t mem; 
};
 
struct HW : public Sink<Request> {
    inline static Registry<HW, I2C_HandleTypeDef, 4> reg{};
 
    Queue<Request> q; //< master
    Request in, out; //< slave
    Deadline deadline{};
    enum {NONE, IN, OUT, Q} active{};
 
    struct Conf {
        I2C_TypeDef *i2c; 
        AFIO sda, scl; 
        uint32_t baud; 
        uint32_t address; 
    };
    HW(const Conf &conf);
    bool full() override;
    void push(Request &&rq) override;
    using Sink<Request>::push;
    void irqEvHandler();
    void irqErHandler();
    I2C_HandleTypeDef handle{};
};
}