ADRS2040U_i2c/main.cpp

#include <stdio.h>
#include <pico/stdlib.h>
#include "hardware/i2c.h"
#include "pico/i2c_slave.h"
#include "hardware/irq.h"
#include "hardware/spi.h"
#include "pico/binary_info.h"
#include "pico/multicore.h"
#include "hardware/irq.h"
#include "hardware/adc.h"
#include "hardware/clocks.h"

#include "ADRS2040U_i2c.h"
#include "adc_driver.hpp"

ADC_Driver adcd;

static void i2c_slave_handler(i2c_inst_t *i2c, i2c_slave_event_t event)
{
    static uint8_t ADRS2040U_cmd = ADRS2040_CMD_INVALID;
    uint8_t raw_data;

    switch(event) {
        case I2C_SLAVE_RECEIVE:
            raw_data = i2c_read_byte_raw(i2c);
            if(ADRS2040U_cmd == ADRS2040_CMD_INVALID) {
                ADRS2040U_cmd = raw_data;
            }
            break;
            
        case I2C_SLAVE_REQUEST:
            DEBUG_PRINT("I2C_SLAVE_REQUEST\n");
            if(ADRS2040U_cmd == ADRS2040_CMD_GET_COUNT) {
                i2c_write_byte_raw(i2c,adcd.count());
            }
            else
                i2c_write_byte_raw(i2c, 0);
            break;

        case I2C_SLAVE_FINISH:
            ADRS2040U_cmd = ADRS2040_CMD_INVALID;
            break;
        
        default:
            break;
    }
}



void i2c_setup(void)
{
    i2c_init(i2c0, 100 * 1000);
    gpio_set_function(GPIO_SDA0, GPIO_FUNC_I2C);
    gpio_set_function(GPIO_SCK0, GPIO_FUNC_I2C);
    // ADRS2040Uでは基板上でプルアップされているので
    // プルアップを無効化する
    gpio_disable_pulls(GPIO_SDA0);
    gpio_disable_pulls(GPIO_SCK0);
    // プルアップする場合は以下の通り
//   gpio_pull_up(GPIO_SDA0);
//   gpio_pull_up(GPIO_SCK0);

    i2c_slave_init(i2c0, I2C0_SLAVE_ADDR, &i2c_slave_handler);
}

int main(void)
{
    stdio_init_all();
    while (true)
    {
        ;
    }
}