[参考译文] TMAG3001EVM：示例代码问题

https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1591891/tmag3001evm-example-code-questions

器件型号： TMAG3001EVM

EVM 的该示例代码是变量 Address_Select、但没有定义。

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uint8_t TMAG3001calculateCRC(uint8_t i2cRead, uint8_t numChannels, uint8_t data[])
{
    if ((i2cRead > 0x02) || (numChannels == 0) || (numChannels > 0x04)) assert(1 == 0);
    int i = 0;
    uint8_t crc = 0xFF;
    uint8_t crcNew = 0x00;
    uint8_t d[8];
    uint8_t c[8];
    int j = 0;

    if (i2cRead == 0x01) numChannels = (numChannels * 2) + 2;
    else if (i2cRead == 0x02) numChannels = (numChannels + 2);
    else numChannels = 4;

    for (i = 0; i < numChannels; i++)
    {
        for (j = 0; j < 8; j++)
        {
            if (i2cRead != 0x00)
            {
                if (i == 0) d[j] = (((Address_Select << 1) | 1) >> j) & 0x01;
                else d[j] = (data[i - 1] >> j) & 0x01;
            }
            else d[j] = (data[i] >> j) & 0x01;
            c[j] = (crc >> j) & 0x01;
        }

        crcNew = d[7] ^ d[6] ^ d[0] ^ c[0] ^ c[6] ^ c[7];
        crcNew |= (d[6] ^ d[1] ^ d[0] ^ c[0] ^ c[1] ^ c[6]) << 1;
        crcNew |= (d[6] ^ d[2] ^ d[1] ^ d[0] ^ c[0] ^ c[1] ^ c[2] ^ c[6]) << 2;
        crcNew |= (d[7] ^ d[3] ^ d[2] ^ d[1] ^ c[1] ^ c[2] ^ c[3] ^ c[7]) << 3;
        crcNew |= (d[4] ^ d[3] ^ d[2] ^ c[2] ^ c[3] ^ c[4]) << 4;
        crcNew |= (d[5] ^ d[4] ^ d[3] ^ c[3] ^ c[4] ^ c[5]) << 5;
        crcNew |= (d[6] ^ d[5] ^ d[4] ^ c[4] ^ c[5] ^ c[6]) << 6;
        crcNew |= (d[7] ^ d[6] ^ d[5] ^ c[5] ^ c[6] ^ c[7]) << 7;
        crc = crcNew;
    }
    return crc;
}

在另一个代码中、延迟为 200ms。 什么是 th eason? 这也可以消除吗？

void TMAG3001restoreDefaultValues()
{
    int i = 0;
    uint8_t defaultRegisters[NUM_REGISTERS] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                                0x49, 0x54, 0x00, 0x00, 0x00, 0x00, 0x00,
                                                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
                                                0x00 };

    for(i = 0; i < NUM_REGISTERS; i++)
    {
        TMAG3001writeToSingleRegister(i, defaultRegisters[i]);
        delay_us(200000);
    }
}