//
// Created by dell on 24-12-3.
//

#include "LDC1612.h"

/*!
    \brief      configure the GPIO ports
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_gpio_config(void) {
    /* enable IIC GPIO clock */
    rcu_periph_clock_enable(RCU_GPIO_I2C);

    /* connect I2C_SCL_PIN to I2C_SCL */
    gpio_af_set(I2C_SCL_PORT, I2C_GPIO_AF, I2C_SCL_PIN);
    /* connect I2C_SDA_PIN to I2C_SDA */
    gpio_af_set(I2C_SDA_PORT, I2C_GPIO_AF, I2C_SDA_PIN);
    /* configure GPIO pins of I2C */
    gpio_mode_set(I2C_SCL_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SCL_PIN);
    gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
    gpio_mode_set(I2C_SDA_PORT, GPIO_MODE_AF, GPIO_PUPD_PULLUP, I2C_SDA_PIN);
    gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
}

/*!
    \brief      configure the I2CX interface
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_config(void) {
    /* enable I2C clock */
    rcu_periph_clock_enable(RCU_I2C);
    /* configure I2C clock */
    i2c_clock_config(I2C0, I2C_SPEED, I2C_DTCY_2);
    /* configure I2C address */
    i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, LDC1612_ADDR);
    /* enable I2CX */
    i2c_enable(I2C0);
    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);
}

/*!
    \brief      reset I2C bus
    \param[in]  none
    \param[out] none
    \retval     none
*/
void i2c_bus_reset(void) {
    i2c_deinit(I2C0);
    /* configure SDA/SCL for GPIO */
    GPIO_BC(I2C_SCL_PORT) |= I2C_SCL_PIN;
    GPIO_BC(I2C_SDA_PORT) |= I2C_SDA_PIN;
    gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
    gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
    __NOP();
    __NOP();
    __NOP();
    __NOP();
    __NOP();
    GPIO_BOP(I2C_SCL_PORT) |= I2C_SCL_PIN;
    __NOP();
    __NOP();
    __NOP();
    __NOP();
    __NOP();
    GPIO_BOP(I2C_SDA_PORT) |= I2C_SDA_PIN;
    /* connect I2C_SCL_PIN to I2C_SCL */
    /* connect I2C_SDA_PIN to I2C_SDA */
    gpio_output_options_set(I2C_SCL_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SCL_PIN);
    gpio_output_options_set(I2C_SDA_PORT, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, I2C_SDA_PIN);
    /* configure the I2CX interface */
    i2c_config();
}

/**
 * @brief 扫描I2C总线，查找连接的设备
 *
 * 该函数会扫描I2C总线上的所有地址（1到126），并尝试与每个地址进行通信。
 * 如果在某个地址上发现了设备，则会打印出该设备的地址。
 * 最后会打印出找到的设备总数。
 */
void i2c_scan(void) {
    uint32_t timeout;
    uint8_t address;
    int found_devices = 0;

    printf("Scanning I2C bus...\r\n");

    for (address = 1; address < 127; address++) {
        timeout = 0;

        // 生成起始条件
        while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT))
            timeout++;
        if (timeout >= I2C_TIME_OUT) {
            continue; // 超时，跳过该地址
        }
        i2c_start_on_bus(I2C0);
        timeout = 0;

        // 等待起始条件发送完成
        while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT))
            timeout++;
        if (timeout >= I2C_TIME_OUT) {
            continue; // 超时，跳过该地址
        }
        i2c_master_addressing(I2C0, (address << 1), I2C_TRANSMITTER);
        timeout = 0;

        // 等待地址发送完成
        while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
            timeout++;
        if (timeout < I2C_TIME_OUT) {
            i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
            printf("Found device at 0x%02X\r\n", address);
            found_devices++;
        }

        // 生成停止条件
        i2c_stop_on_bus(I2C0);

        timeout = 0;

        while (i2c_flag_get(I2C0, I2C_FLAG_STPDET) && (timeout < I2C_TIME_OUT))
            timeout++;
    }

    if (found_devices == 0) {
        printf("No I2C devices found.\r\n");
    } else {
        printf("Total %d I2C devices found.\r\n", found_devices);
    }
}

/** @brief set conversion interval time.
    @param channel LDC1612 has total two channels.
    @param result The value to be set.
 * */
void ldc1612_set_conversion_time(uint8_t channel, uint16_t result) {
    uint8_t data[2] = {0};
    data[0] = (result >> 8) & 0xFF;
    data[1] = result & 0xFF;
    ldc1612_iic_write_16bits(SET_CONVERSION_TIME_REG_START + channel, data);
}

/** @brief set conversion offset.
    @param channel LDC1612 has total two channels.
    @param result The value to be set.
 * */
void ldc1612_set_conversion_offset(uint8_t channel, uint16_t result) {
    uint8_t data[2] = {0};
    data[0] = (result >> 8) & 0xFF;
    data[1] = result & 0xFF;
    ldc1612_iic_write_16bits(SET_CONVERSION_OFFSET_REG_START + channel, data);
}

/** @brief Before conversion,wait LC sensor stabilize for a short time.
    @param channel LDC1612 has total two channels.
    @param result The value to be set.
 * */
void ldc1612_set_LC_stabilize_time(uint8_t channel, uint16_t result) {
    uint8_t data[2] = {0};
    data[0] = (result >> 8) & 0xFF;
    data[1] = result & 0xFF;
    ldc1612_iic_write_16bits(SET_LC_STABILIZE_REG_START + channel, data);
}

/** @brief set input frequency divide and fref divide.
    @param channel LDC1612 has total two channels.
    @param FIN_DIV FIN input divide
    @param FREF_DIV fref,reference frequency of sensor.
 * */
void ldc1612_set_freq_divide(uint8_t channel) {
    uint16_t value;
    uint16_t fin_div, freq_div;
    float sensor_freq;

    sensor_freq = 1 / (2 * 3.14 * sqrt(COIL_L_UH * COIL_C_PF * pow(10, -18))) * pow(10, -6);

    fin_div = (uint16_t) (sensor_freq / 8.75 + 1);

    if (fin_div * 4 < 40) {
        freq_div = 2;
    } else {
        freq_div = 4;
    }

    value = fin_div << 12;
    value |= freq_div;
    // printf("\tvalue: 0x%x\r\n", value);

    uint8_t data[2] = {0};
    data[0] = (value >> 8) & 0xFF;
    data[1] = value & 0xFF;
    // printf("\tFIN_DIV: %d, FREF_DIV: %d\r\n", fin_div, freq_div);

    ldc1612_iic_write_16bits(SET_FREQ_REG_START + channel, data);
}

/** @brief Error output config.
    @param result The value to be set.
 * */
void ldc1612_set_error_config(uint16_t value) {
    uint8_t data[2] = {0};
    data[0] = (value >> 8) & 0xFF;
    data[1] = value & 0xFF;

    ldc1612_iic_write_16bits(ERROR_CONFIG_REG, data);
}

/** @brief mux  config.
    @param result The value to be set.
 * */
void ldc1612_set_mux_config(uint16_t value) {
    uint8_t data[2] = {0};
    data[0] = (value >> 8) & 0xFF;
    data[1] = value & 0xFF;

    ldc1612_iic_write_16bits(MUL_CONFIG_REG, data);
}

/** @brief reset sensor.

 * */
void ldc1612_reset_sensor(void) {
    uint8_t data[2] = {0};
    data[0] = 0x80;
    data[1] = 0x00;
    ldc1612_iic_write_16bits(SENSOR_RESET_REG, data);
}

/** @brief set drive current of sensor.
    @param result The value to be set.
 * */
void ldc1612_set_drive_current(uint8_t channel, uint16_t value) {
    uint8_t data[2] = {0};
    data[0] = (value >> 8) & 0xFF;
    data[1] = value & 0xFF;

    ldc1612_iic_write_16bits(SET_DRIVER_CURRENT_REG + channel, data);
}

/** @brief Main config part of sensor.Contains select channel、start conversion、sleep mode、sensor activation mode、INT pin disable ..
    @param result The value to be set.
 * */
void ldc1612_set_sensor_config(uint16_t value) {
    uint8_t data[2] = {0};
    data[0] = (value >> 8) & 0xFF;
    data[1] = value & 0xFF;

    ldc1612_iic_write_16bits(SENSOR_CONFIG_REG, data);
}

void ldc1612_single_ch0_config(void) {
    ldc1612_set_freq_divide(CHANNEL_0); //0x14 --0x1002

    ldc1612_set_LC_stabilize_time(CHANNEL_0, LC_STABILIZE_TIME_CH0); //0x10 --0x001E

    ldc1612_set_conversion_time(CHANNEL_0, LDC1612_CONVERSION_TIME_CH0); //0x08 --0x0546

    ldc1612_set_error_config(LDC1612_ERROR_CONFIG); //0x19 --0x0000)

    ldc1612_set_drive_current(CHANNEL_0, LDC1612_DRIVE_CURRENT); //0x1E --0x9000

    ldc1612_set_mux_config(LDC1612_MUX_CONFIG); //0x1B --0x020C

    ldc1612_set_sensor_config(LDC1612_SENSOR_CONFIG); //0x1A --0x1601
}

void ldc1612_iic_get_sensor_infomation(void) {
    uint8_t data[2] = {0};
    ldc1612_iic_read_16bits(READ_MANUFACTURER_ID, data);
    printf("\tManufacturer: 0x%x\r\n", (data[0] << 8) | data[1]);
    ldc1612_iic_read_16bits(READ_DEVICE_ID, data);
    printf("\tDevice: 0x%x\r\n", (data[0] << 8) | data[1]);
}

uint16_t ldc1612_get_manufacturer_id(void) {
    uint8_t data[2] = {0};
    ldc1612_iic_read_16bits(READ_MANUFACTURER_ID, data);
    return (data[0] << 8) | data[1];
}

uint16_t ldc1612_get_deveice_id(void) {
    uint8_t data[2] = {0};
    ldc1612_iic_read_16bits(READ_DEVICE_ID, data);
    return (data[0] << 8) | data[1];
}

/** @brief read the raw channel result from register.
    @param channel LDC1612 has total two channels.
    @param result raw data
 * */
uint32_t ldc1612_get_raw_channel_result(uint8_t channel) {
    uint32_t raw_value = 0;
    uint8_t value[2] = {0};

    ldc1612_iic_read_16bits(CONVERTION_RESULT_REG_START + channel, value);
    raw_value |= (uint32_t) ((value[0] << 8) | value[1]) << 16;
    ldc1612_iic_read_16bits(CONVERTION_RESULT_REG_START + channel + 1, value);
    raw_value |= (uint32_t) ((value[0] << 8) | value[1]);
    return ldc1612_parse_raw_result(raw_value);
}

/** @brief parse the data which read from data register.
    @param channel LDC1612 has total two channels.
    @param raw_result the raw data which read from data register,it contains error codes and sensor value;
 * */
uint32_t ldc1612_parse_raw_result(uint32_t raw_result) {
    uint32_t calibration_value = 0;
    uint8_t error_code = 0;

    calibration_value = raw_result & 0x0FFFFFFF;
    if (0xFFFFFFF == calibration_value) {
        return 0xF0000000;
        // ERR_NC-No coil detected!!!
    }

    error_code = raw_result >> 24;

    if (error_code & 0x80) {
        return 0x80000000;
        // ERR_UR-Under range error!!!
    }
    if (error_code & 0x40) {
        return 0x40000000;
        // ERR_OR-Over range error!!!
    }
    if (error_code & 0x20) {
        return 0x20000000;
        // ERR_WD-Watch dog timeout error!!!
    }
    if (error_code & 0x10) {
        return 0x10000000;
        // ERR_AE-error!!!
    }

    return raw_result;
}


uint8_t ldc1612_iic_read_16bits(uint8_t reg_addr, uint8_t *data) {
    uint8_t state = I2C_START;
    uint8_t read_cycle = 0;
    uint16_t timeout = 0;
    uint8_t i2c_timeout_flag = 0;
    uint8_t number_of_byte = 2;

    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);

    while (!(i2c_timeout_flag)) {
        switch (state) {
            case I2C_START:
                if (RESET == read_cycle) {
                    /* i2c master sends start signal only when the bus is idle */
                    while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
                        timeout++;
                    }
                    if (timeout < I2C_TIME_OUT) {
                        /* whether to send ACK or not for the next byte */
                        i2c_ackpos_config(I2C0, I2C_ACKPOS_NEXT);
                    } else {
                        // i2c_bus_reset();
                        timeout = 0;
                        state = I2C_START;
                        printf("i2c bus is busy in READ!\n");
                    }
                }
            /* send the start signal */
                delay_us(5);
                i2c_start_on_bus(I2C0);
                timeout = 0;
                state = I2C_SEND_ADDRESS;
                break;
            case I2C_SEND_ADDRESS:
                /* i2c master sends START signal successfully */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    if (RESET == read_cycle) {
                        i2c_master_addressing(I2C0, LDC1612_ADDR, I2C_TRANSMITTER);
                        state = I2C_CLEAR_ADDRESS_FLAG;
                    } else {
                        i2c_master_addressing(I2C0, LDC1612_ADDR, I2C_RECEIVER);
                        i2c_ack_config(I2C0, I2C_ACK_DISABLE);
                        state = I2C_CLEAR_ADDRESS_FLAG;
                    }
                    timeout = 0;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    read_cycle = RESET;
                    printf("i2c master sends start signal timeout in READ!\n");
                }
                break;
            case I2C_CLEAR_ADDRESS_FLAG:
                /* address flag set means i2c slave sends ACK */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
                    if ((SET == read_cycle) && (1 == number_of_byte)) {
                        /* send a stop condition to I2C bus */
                        i2c_stop_on_bus(I2C0);
                    }
                    timeout = 0;
                    state = I2C_TRANSMIT_DATA;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    read_cycle = RESET;
                    printf("i2c master clears address flag timeout in READ!\n");
                }
                break;
            case I2C_TRANSMIT_DATA:
                if (RESET == read_cycle) {
                    /* wait until the transmit data buffer is empty */
                    while ((!i2c_flag_get(I2C0, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
                        timeout++;
                    }
                    if (timeout < I2C_TIME_OUT) {
                        /* send the EEPROM's internal address to write to : only one byte address */
                        i2c_data_transmit(I2C0, reg_addr);
                        timeout = 0;
                    } else {
                        timeout = 0;
                        state = I2C_START;
                        read_cycle = RESET;
                        printf("i2c master wait data buffer is empty timeout in READ!\n");
                    }
                    /* wait until BTC bit is set */
                    while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
                        timeout++;
                    }
                    if (timeout < I2C_TIME_OUT) {
                        timeout = 0;
                        state = I2C_START;
                        read_cycle = SET;
                    } else {
                        timeout = 0;
                        state = I2C_START;
                        read_cycle = RESET;
                        printf("i2c master sends register address timeout in READ!\n");
                    }
                } else {
                    while (number_of_byte) {
                        timeout++;
                        if (2 == number_of_byte) {
                            /* wait until BTC bit is set */
                            while (!i2c_flag_get(I2C0, I2C_FLAG_BTC));
                            /* send a stop condition to I2C bus */
                            i2c_stop_on_bus(I2C0);
                        }
                        /* wait until RBNE bit is set */
                        if (i2c_flag_get(I2C0, I2C_FLAG_RBNE)) {
                            /* read a byte from the EEPROM */
                            *data = i2c_data_receive(I2C0);
                            /* point to the next location where the byte read will be saved */
                            data++;
                            /* decrement the read bytes counter */
                            number_of_byte--;
                            timeout = 0;
                        }
                        if (timeout > I2C_TIME_OUT) {
                            timeout = 0;
                            state = I2C_START;
                            read_cycle = 0;
                            printf("i2c master sends data timeout in READ!\n");
                        }
                    }
                    timeout = 0;
                    state = I2C_STOP;
                }
                break;
            case I2C_STOP:
                /* i2c master sends STOP signal successfully */
                while ((I2C_CTL0(I2C0) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    timeout = 0;
                    state = I2C_END;
                    i2c_timeout_flag = I2C_OK;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    read_cycle = 0;
                    printf("i2c master sends stop signal timeout in READ!\n");
                }
                break;
            default:
                state = I2C_START;
                read_cycle = 0;
                i2c_timeout_flag = I2C_OK;
                timeout = 0;
                printf("i2c master sends start signal in READ.\n");
                break;
        }
    }
    return I2C_END;
}

uint8_t ldc1612_iic_write_16bits(uint8_t reg_addr, uint8_t data[2]) {
    uint8_t state = I2C_START;
    uint16_t timeout = 0;
    uint8_t i2c_timeout_flag = 0;

    /* enable acknowledge */
    i2c_ack_config(I2C0, I2C_ACK_ENABLE);
    while (!(i2c_timeout_flag)) {
        switch (state) {
            case I2C_START:
                /* i2c master sends start signal only when the bus is idle */
                while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    i2c_start_on_bus(I2C0);
                    timeout = 0;
                    state = I2C_SEND_ADDRESS;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c bus is busy in WRITE BYTE!\n");
                }
                break;
            case I2C_SEND_ADDRESS:
                /* i2c master sends START signal successfully */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_SBSEND)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    i2c_master_addressing(I2C0, LDC1612_ADDR, I2C_TRANSMITTER);
                    timeout = 0;
                    state = I2C_CLEAR_ADDRESS_FLAG;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends start signal timeout in WRITE BYTE!\n");
                }
                break;
            case I2C_CLEAR_ADDRESS_FLAG:
                /* address flag set means i2c slave sends ACK */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
                    timeout = 0;
                    state = I2C_TRANSMIT_DATA;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master clears address flag timeout in WRITE BYTE!\n");
                }
                break;
            case I2C_TRANSMIT_DATA:
                /* wait until the transmit data buffer is empty */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_TBE)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    /* send IIC register address */
                    i2c_data_transmit(I2C0, reg_addr);
                    timeout = 0;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends data timeout in WRITE BYTE!\n");
                }

            /* wait until BTC bit is set */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    /* send register MSB value */
                    i2c_data_transmit(I2C0, data[0]);
                    timeout = 0;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends MSB data timeout in WRITE BYTE!\n");
                }

            /* wait until BTC bit is set */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    /* send register LSB value */
                    i2c_data_transmit(I2C0, data[1]);
                    timeout = 0;
                    state = I2C_STOP;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends LSB data timeout in WRITE BYTE!\n");
                }

            /* wait until BTC bit is set */
                while ((!i2c_flag_get(I2C0, I2C_FLAG_BTC)) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    state = I2C_STOP;
                    timeout = 0;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends data timeout in WRITE BYTE!\n");
                }
                break;
            case I2C_STOP:
                /* send a stop condition to I2C bus */
                i2c_stop_on_bus(I2C0);
            /* i2c master sends STOP signal successfully */
                while ((I2C_CTL0(I2C0) & I2C_CTL0_STOP) && (timeout < I2C_TIME_OUT)) {
                    timeout++;
                }
                if (timeout < I2C_TIME_OUT) {
                    timeout = 0;
                    state = I2C_END;
                    i2c_timeout_flag = I2C_OK;
                } else {
                    timeout = 0;
                    state = I2C_START;
                    printf("i2c master sends stop signal timeout in WRITE BYTE!\n");
                }
                break;
            default:
                state = I2C_START;
                i2c_timeout_flag = I2C_OK;
                timeout = 0;
                printf("i2c master sends start signal in WRITE BYTE.\n");
                break;
        }
    }
    return I2C_END;
}

uint32_t TMP112A_ReadTemperature(void) {
    uint8_t data[2] = {0};
    uint16_t raw_temp = 0;
    uint16_t timeout = 0;
    uint32_t temperature = 0;

    i2c_ack_config(I2C0, I2C_ACK_ENABLE);

    while (i2c_flag_get(I2C0, I2C_FLAG_I2CBSY) && (timeout < I2C_TIME_OUT)) //判断IIC总线是否忙，发送起始信号
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_start_on_bus(I2C0);
        timeout = 0;
    } else {
        printf("err\r\n");
        return -1; // 超时返回错误
    }

    while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT)) //判断起始位是否发送，设置sensor地址并设置为写
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_master_addressing(I2C0, TMP112A_ADDR, I2C_TRANSMITTER);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    while (!i2c_flag_get(I2C0, I2C_FLAG_TBE) && (timeout < I2C_TIME_OUT)) //判断地址是否发送完成，然后发送寄存器地址
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_data_transmit(I2C0, 0x00);
        timeout = 0;
        // i2c_start_on_bus(I2C0);
    } else {
        return -1; // 超时返回错误
    }

    while (i2c_flag_get(I2C0, I2C_FLAG_BTC) && (timeout < I2C_TIME_OUT)) //判断发送缓冲器是否为空，为空后（发送完毕）重新发送开始信号
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_start_on_bus(I2C0);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    while (!i2c_flag_get(I2C0, I2C_FLAG_SBSEND) && (timeout < I2C_TIME_OUT)) {
        timeout++;
    }
    if (timeout < I2C_TIME_OUT) {
        i2c_master_addressing(I2C0, TMP112A_ADDR, I2C_RECEIVER);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    while (!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND) && (timeout < I2C_TIME_OUT))
        timeout++;
    if (timeout < I2C_TIME_OUT) {
        i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    // 读取第一个字节的数据
    while (!i2c_flag_get(I2C0, I2C_FLAG_RBNE) && (timeout < I2C_TIME_OUT)) {
        timeout++;
    }
    if (timeout < I2C_TIME_OUT) {
        data[0] = i2c_data_receive(I2C0);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    i2c_ack_config(I2C0, I2C_ACK_DISABLE); // 关闭发送ACK，它会在下一个字节完成后发送NAK

    // 读取第二个字节的数据
    while (!i2c_flag_get(I2C0, I2C_FLAG_RBNE) && (timeout < I2C_TIME_OUT)) {
        timeout++;
    }
    if (timeout < I2C_TIME_OUT) {
        data[1] = i2c_data_receive(I2C0);
        timeout = 0;
    } else {
        return -1; // 超时返回错误
    }

    i2c_stop_on_bus(I2C0);

    // printf("data[0]: %x, data[1]: %x\r\n", data[0], data[1]);
    raw_temp = ((uint16_t) (data[0] << 4) | (data[1]>>4));
    // printf("raw_temp: %x\r\n", raw_temp);
    // printf("raw_temp(dec): %d\r\n", raw_temp);
    temperature = raw_temp * 625;
    // printf("temperature: %d\r\n", temperature);

    return temperature;
}