hw_i2c.h

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#pragma once
 
#include "hardware/i2c.h"
#include "pico/i2c_slave.h"
#include "pico/stdlib.h"
#include <set>
#include <string>

#define I2C_STANDARD_MODE 100 * 1000
#define I2C_FAST_MODE 400 * 1000
#define I2C_FAST_MODE_PLUS 1000 * 1000
#define I2C_SLAVE_DEFAULT_MAX_MEMORY_SIZE 256

struct struct_I2CXferResult
{
    bool error = false;
    std::string context = "";
    int xfer_size = 0;
};

struct struct_ConfigMasterI2C
{
    i2c_inst_t *i2c = i2c0;
    uint sda_pin = 04;
    uint scl_pin = 05;
    uint baud_rate = I2C_STANDARD_MODE;
};

struct struct_ConfigSlaveI2C
{
    i2c_inst_t *i2c = i2c1;
    uint sda_pin = 06;
    uint scl_pin = 07;
    uint baud_rate = I2C_STANDARD_MODE;
    uint8_t slave_address = 0x55;
    size_t slave_memory_size = I2C_SLAVE_DEFAULT_MAX_MEMORY_SIZE;
    i2c_slave_handler_t handler;
};

class HW_I2C_Master
{
private:
    i2c_inst_t *i2c;
    uint time_out_us_per_byte;
 
public:
    HW_I2C_Master(struct_ConfigMasterI2C master_config);
    struct_I2CXferResult burst_byte_write(uint8_t slave_address, uint8_t mem_addr, uint8_t *src, size_t len);
    struct_I2CXferResult single_byte_write(uint8_t slave_address, uint8_t mem_addr, uint8_t mem_value);
    struct_I2CXferResult single_byte_read(uint8_t slave_address, uint8_t mem_addr, uint8_t *dest);
    struct_I2CXferResult burst_byte_read(uint8_t slave_address, uint8_t mem_addr, uint8_t *dest, size_t len);
    std::set<uint8_t> bus_scan();
    bool device_is_connected(uint8_t slave_address);
};

struct struct_SlaveMemory
{
    uint8_t mem[I2C_SLAVE_DEFAULT_MAX_MEMORY_SIZE]{};
    uint8_t mem_address = I2C_SLAVE_DEFAULT_MAX_MEMORY_SIZE - 1;
    bool mem_address_written = false;
};

class HW_I2C_Slave
{
private:
    i2c_inst_t *i2c;
 
public:
    struct_SlaveMemory context;
    HW_I2C_Slave(struct_ConfigSlaveI2C slave_config);
    void slave_isr(i2c_slave_event_t event);
};