[参考译文] MSPM0C1104：使用 BQ76952读取 I2C 存储器时出现问题

您好！

您的主要目的是将示例代码从 L1306迁移到 C1104 TSSOP 封装。  

但我检查了代码、它仅使用 L1306上的 I2C 端口(PA0和 PA1)。 C1104 TSSOP 封装还具有 PA0和 PA1。 这两个 MCU 之间不应进行任何更改。 我也觉得你有一个关于 C1104 MCU 的工作项目。 但是、I2C 通信存在一些问题。 您能详细描述一下这个问题、以便我们提供帮助吗？

Unknown 说：

我可以读取某些内存位置的正确数据，但在其他位置我得到了垃圾数据。

此致、

现金豪

您好！

是的、我检查了 BQ76952的 L1306示例中具有  适用于 I2C 的 PA0和 PA1引脚。

是的、 我们的主要目的是将 BQ76952的示例代码从 L1306迁移到 C1104 TSSOP 封装。  

I2C 存在以下问题：

我 使用 M0C11004 (VSSOP)从 Resource Explorer 中打开了 i2c_controller_rw_multibyte_fifo_poll 示例。

我编辑了其主要函数并添加了 BQ76952 示例中的所有函数 、以读取电池电压。

结果是我没有获得任何值。

仅当我在  I2C_ReadReg (  )函数中添加 DL_I2C_flushControllerTXFIFO (I2C_INST)；函数时

然后我在 CellVoltage 数组中接收值，但这些值与电池电压不精确。

这是我的代码。

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#include "ti_msp_dl_config.h"
/*
 * Number of bytes to send from Controller to target.
 *  This example uses FIFO with polling, and the maximum FIFO size is 4.
 *  Refer to interrupt examples to handle larger packets
 */
#define I2C_TX_PACKET_SIZE (2)

/*
 * Number of bytes to received from target.
 *  This example uses FIFO with polling, and the maximum FIFO size is 4.
 *  Refer to interrupt examples to handle larger packets
 */
#define I2C_RX_PACKET_SIZE (4)

#define Cell1Voltage 0x14
#define StackVoltage 0x34
#define PACKPinVoltage 0x36
#define Cell16Voltage 0x32
#define R 0         //Read

void I2C_Send();
void I2C_Receive_Controller();
void delayUS(uint16_t us);
void I2C_ReadReg(uint8_t reg_addr, uint8_t *reg_data, uint8_t count);
void DirectCommands(uint8_t command, uint16_t data, uint8_t type);
uint16_t BQ769x2_ReadVoltage(uint8_t command);
void BQ769x2_ReadAllVoltages();


/* Data sent to the Target */
uint8_t gTxPacket[I2C_TX_PACKET_SIZE] = {0x14};
/* Data received from Target */
uint8_t gRxPacket[2];
uint16_t CellVoltage[16];
/* I2C Target address */
#define I2C_TARGET_ADDRESS   (0x08)//(0x48)

uint32_t gTxLen, gTxCount;
uint8_t RX_data[2];

uint16_t Cell_voltage;
uint16_t Stack_Voltage = 0x00;
uint16_t Pack_Voltage  = 0x00;
uint16_t LD_Voltage    = 0x00;


void delayUS(uint16_t us)
{  // Sets the delay in microseconds.
    uint16_t ms;
    char i;
    ms = us / 1000;
    for (i = 0; i < ms; i++) delay_cycles(32000);
}

//************I2C read register **********************
void I2C_ReadReg(uint8_t reg_addr, uint8_t *reg_data, uint8_t count)
{
    DL_I2C_fillControllerTXFIFO(I2C_INST, &reg_addr, count);

    /* Wait for I2C to be Idle */
    while (!(DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE));

    DL_I2C_startControllerTransfer(I2C_INST, I2C_TARGET_ADDRESS, DL_I2C_CONTROLLER_DIRECTION_TX, 1);

    while (DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_BUSY_BUS) ;
    /* Trap if there was an error */
    if (DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_ERROR)
    {
        /* LED will remain high if there is an error */
        __BKPT(0);
    }
    /* Wait for I2C to be Idle */
    while (!(DL_I2C_getControllerStatus(I2C_INST) & DL_I2C_CONTROLLER_STATUS_IDLE));
    /* Add delay between transfers */
    delay_cycles(1000);
    DL_I2C_flushControllerTXFIFO(I2C_INST);

    /* Send a read request to Target */
    DL_I2C_startControllerTransfer(I2C_INST, I2C_TARGET_ADDRESS, DL_I2C_CONTROLLER_DIRECTION_RX, count);

    for (uint8_t i = 0; i < count; i++)
    {
        while (DL_I2C_isControllerRXFIFOEmpty(I2C_INST));
        reg_data[i] = DL_I2C_receiveControllerData(I2C_INST);
    }
}

void DirectCommands(uint8_t command, uint16_t data, uint8_t type)
// See the TRM or the BQ76952 header file for a full list of Direct Commands
{  //type: R = read, W = write
    uint8_t TX_data[2] = {0x00, 0x00};

    //little endian format
    TX_data[0] = data & 0xff;
    TX_data[1] = (data >> 8) & 0xff;

    if (type == R) {                       //Read
        I2C_ReadReg(command, RX_data, 2);  //RX_data is a global variable
        delayUS(2000);
        delayUS(2000);  //success in 100k
    }
//    if (type == W) {  //write
//        //Control_status, alarm_status, alarm_enable all 2 bytes long
//        I2C_WriteReg(command, TX_data, 2);
//        delayUS(2000);
//        delayUS(2000);
//    }
}

uint16_t BQ769x2_ReadVoltage(uint8_t command)
// This function can be used to read a specific cell voltage or stack / pack / LD voltage
{
    //RX_data is global var
    DirectCommands(command, 0x00, R);
    if (command >= Cell1Voltage &&
        command <= Cell16Voltage) {  //Cells 1 through 16 (0x14 to 0x32)
        return (RX_data[1] * 256 + RX_data[0]);  //voltage is reported in mV
    } else {                                     //stack, Pack, LD
        return 10 * (RX_data[1] * 256 +
                        RX_data[0]);  //voltage is reported in 0.01V units
    }
}

void BQ769x2_ReadAllVoltages()
// Reads all cell voltages, Stack voltage, PACK pin voltage, and LD pin voltage
{
    unsigned char x;
    int cellvoltageholder = Cell1Voltage;  //Cell1Voltage is 0x14
    for (x = 0; x < 16; x++) {             //Reads all cell voltages
        CellVoltage[x]    = BQ769x2_ReadVoltage(cellvoltageholder);
        cellvoltageholder = cellvoltageholder + 2;
    }
    Stack_Voltage = BQ769x2_ReadVoltage(StackVoltage);
    Pack_Voltage  = BQ769x2_ReadVoltage(PACKPinVoltage);
}

int main(void)
{
  SYSCFG_DL_init();
  DL_SYSCTL_disableSleepOnExit();
  while (1) {

      BQ769x2_ReadAllVoltages();
//      I2C_ReadReg();
//      Cell_voltage =  gRxPacket[1]* 256 +  gRxPacket[0];
     //I2C_Send();
     //I2C_Receive_Controller();
      delayUS(5000);
      }
}

 如果我 将 BQ76952的示例代码从 L1306迁移到  MSPS003FX (TSSOP)并执行上面提到的所有操作。

然后、在切换到调试模式时、我的 resume (F8)选项被禁用、并且我在控制台中收到以下消息：

Cortex_M0P：加载程序：程序的一个或多个部分落入无法写入的内存区域。  这些区域实际上不会写入目标。  检查链接器配置和/或存储器映射。

请帮助我如何从 这个消息中克服。 我在互联网上搜索了这条消息、但找不到任何容易 理解的解决方案。

图片。  e2e.ti.com/.../empty_5F00_non_5F00_sysconfig_5F00_LP_5F00_MSPM0C1104_5F00_nortos_5F00_ticlang.zip