[参考译文] CC1310：I2C 随机生成硬件异常

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请注意，本文内容源自机器翻译，可能存在语法或其它翻译错误，仅供参考。如需获取准确内容，请参阅链接中的英语原文或自行翻译。

https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/1505758/cc1310-i2c-raises-hw-exceptions-at-random-moments

器件型号：CC1310

工具/软件：

在我的应用中、我有2个传感器连接到同一条 I2C 总线。当我启动器件时、它会无错误地初始化 I2C、但当我尝试写入一个器件时、I2C 失败、这个错误是随机的、因为有时会发生、我不知道为什么。

我在两条线路上都有10k 上拉电阻器、我确保一次只有一个传感器使用具有信标的 I2C。我的代码在下面,但我认为这不是问题。

/*
 * @brief Initializes the I2C driver.
 * @return TRUE: error.
 *         FALSE: success.
 */
bool i2c_init() {

    I2C_init();
    I2C_Params_init(&i2c_params);
    i2c_params.bitRate = I2C_100kHz;
    i2c_params.transferMode = I2C_MODE_BLOCKING;

    i2c = I2C_open(Board_I2C0, &i2c_params);
    if (i2c == NULL)
        return true;
    return false;
}

/*
 * @brief Writes data to register.
 * @param addr Address of the slave device.
 * @param reg Register to write into.
 * @param data Values to write.
 * @param data_len Amount of bytes to write.
 * @return Status (true = success).
 */
bool i2c_write(const uint8_t addr, uint8_t reg, uint8_t *data, const size_t data_len) {
    if (i2c == NULL || data == NULL || data_len == 0) {
        return false;
    }

    uint8_t tx[16];
    tx[0] = reg;

    size_t i = 0;
    for (i = 0; i < data_len; i++)
        tx[i+1] = data[i];

    uint32_t key = HwiP_disable();

    i2c_transaction.slaveAddress = addr;
    i2c_transaction.writeBuf = tx;
    i2c_transaction.writeCount = data_len + 1;
    i2c_transaction.readBuf = NULL;
    i2c_transaction.readCount = 0;

    bool status = I2C_transfer(i2c, &i2c_transaction);

    HwiP_restore(key);

    return status;
}

/*
 * @brief Reads <data_len> bytes from a register.
 * @param addr Address of the slave device.
 * @param reg Register to start reading from.
 * @param data Buffer where the read data will be stored.
 * @param data_len Amount of bytes to read.
 * @return Status (true = success).
 */
bool i2c_read(const uint8_t addr, uint8_t reg, uint8_t *data, const size_t data_len) {
    if (i2c == NULL || data == NULL || data_len == 0) {
        return false;
    }

    uint32_t key = HwiP_disable();

    i2c_transaction.slaveAddress = addr;
    i2c_transaction.writeBuf = 
    i2c_transaction.writeCount = 1;
    i2c_transaction.readBuf = data;
    i2c_transaction.readCount = data_len;

    bool status = I2C_transfer(i2c, &i2c_transaction);

    HwiP_restore(key);

    return status;
}