[参考译文] BQ76952：无法更改数据存储器的值

admin

Other Parts Discussed in Thread: BQ76952, BQ34Z100, MSP430FR2155

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/power-management-group/power-management/f/power-management-forum/1389135/bq76952-unable-to-change-the-values-of-the-data-memory

器件型号：BQ76952
主题中讨论的其他器件： BQ34Z100、 MSP430FR2155

工具与软件：

您好、TI 专家！

我正在使用由 MSP430FR2155、BQ76952和 BQ34Z100组成的定制设计 PCB。我正在尝试访问数据存储器寄存器、我将打捆从寄存器中读取数据、但当我尝试写入寄存器时、操作无法正常工作。我在 TI 网站上获取了 BQ799x2示例代码中的代码。我已经按照 BQ76952 TRM 中所述的步骤访问第13.1节中的数据存储器。我将上传我要使用的代码以及逻辑分析仪的屏幕截图。您能告诉我在这里可以做些什么吗？

提前感谢！祝你度过美好的一天！

    // main program
    CommandSubcommands(SET_CFGUPDATE);
    BQ76952_write(monitor, EnabledProtectionsA, 0x8C, 1);
    delayUS(50000);
    rx_arr = BQ76952_readDMA(monitor, EnabledProtectionsA, 1);
    tx_arr[6] = rx_arr[0];
    tx_arr[7] = rx_arr[1];
    CommandSubcommands(EXIT_CFGUPDATE);
    
    // source code
    int BQ76952_write(unsigned char Slave_address, uint16_t reg_addr, uint16_t data, int len)
{
    unsigned int sentbyte = 0;
        uint8_t TX_Buffer[3] = {0x00, 0x00, 0x00};
        uint8_t TX_RegData[7] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
       TX_RegData[0] = 0x3E;
       TX_RegData[1] = reg_addr & 0xff;
       TX_RegData[2] = (reg_addr >> 8) & 0xff;
       TX_RegData[3] = data & 0xff; //1st byte of data
       switch(len)
       {
           case 1: //1 byte datalength
               I2CSendBytes(Slave_address, TX_RegData, 4, &sentbyte);
               delayUS(2000);
               TX_Buffer[0] = 0x60;
               TX_Buffer[1] = Checksum(TX_RegData, 4);
               TX_Buffer[2] = 0x06; //combined length of register address and data
               I2CSendBytes(Slave_address, TX_Buffer, 3, &sentbyte); // Write the checksum and length
               delayUS(2000);
               break;
           case 2: //2 byte datalength
               TX_RegData[4] = (data >> 8) & 0xff;
               I2CSendBytes(Slave_address, TX_RegData, 5, &sentbyte);
               delayUS(2000);
               TX_Buffer[0] = 0x60;
               TX_Buffer[1] = Checksum(TX_RegData, 5);
               TX_Buffer[2] = 0x07; //combined length of register address and data
               I2CSendBytes(Slave_address, TX_Buffer, 3, &sentbyte); // Write the checksum and length
               delayUS(2000);
               break;
       }
       return 0;
}

unsigned char* BQ76952_readDMA(unsigned char Slave_address, uint16_t reg_addr, int len)
{
       unsigned int sentbyte = 0;
       unsigned int count = 0;
       static unsigned char RX_Buffer[3] = {0x00, 0x00, 0x00};
       uint8_t TX_RegData[7] = {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
       TX_RegData[0] = 0x3E;
       TX_RegData[1] = reg_addr & 0xff;
       TX_RegData[2] = (reg_addr >> 8) & 0xff;
       switch(len)
       {
           case 1: //1 byte datalength
               I2CSendBytes(Slave_address, TX_RegData, 3, &sentbyte);
               delayUS(2000);
               I2CReadBytes(Slave_address, RX_Buffer, len, &count);
               delayUS(2000);
               break;
           case 2: //2 byte datalength
               I2CSendBytes(Slave_address, TX_RegData, 3, &sentbyte);
               delayUS(2000);
               I2CReadBytes(Slave_address, RX_Buffer, len, &count);
               delayUS(2000);
               break;
       }
       return RX_Buffer;
}

unsigned char Checksum(unsigned char *ptr, unsigned char len)
// Calculates the checksum when writing to a RAM register. The checksum is the inverse of the sum of the bytes.
{
    unsigned char i;
    unsigned char checksum = 0;

    for(i=0; i<len; i++)
        checksum += ptr[i];

    checksum = 0xff & ~checksum;

    return(checksum);
}

进入 CONFIG_UPDATE 模式：