Question

目标：根据结构成员的值写入内部缓冲区。

我的结构包含Uint16类型的成员（unsigned int）;这里只是其中的一小部分：

typedef unsigned int    Uint16;
typedef struct 
{
    Uint16 ee_Speed_Control_Mode;
    Uint16 ee_Motor_Type;
    Uint16 ee_Max_Electrical_Speed;
    Uint16 ee_Carrier_Frequency;
    Uint16 ee_Rated_Motor_Frequency;
    Uint16 ee_Rated_Motor_Current;
    Uint16 ee_Rs; // extern
    Uint16 ee_Rr; // extern
    Uint16 ee_L_lkg; // extern
    Uint16 ee_Lm;    // extern
    Uint16 ee_No_Load_Current;
    Uint16 ee_Phase_Reversal;
    .....
    .....
} EEPROM_PARAMETERS;

EEPROM_PARAMETERS eepromParameters;

我的尝试：

这是一个用于写入eeprom的函数:(为简单起见，大部分内容未显示;重点发生在＆＃39; for＆＃39;循环

void eeprom_write(Uint16 address, Uint32 *data, Int16 len)
{
    Uint16 i;

    // Multiple bytes will be written
    // Page Write operation will be used
    // Page Write bits to be sent:

    // bit 0: Start condition, a high-to-low transition of SDA with SCL high
    startCondition();

    // bits 1-8: Device address
    I2caRegs.I2CDXR = DEVICE_ADDRESS_WRITE;

    // bit 9: EEPROM outputs 0 as ACK bit
    // Check for ACK bit
    while (I2caRegs.I2CDRR != 0)
    {
        wait();
    }

    // bits 10-17, bit 18 (ACK) and bits 19-26: two 8-bit word addresses
    I2caRegs.I2CDXR = address;

    // After setting the address, page write is capable of writing 64 bytes without stopping
    // The EEPROM will respond with a zero after each data word has been received
    // The data word address lower 6 bits are internally incremented following the receipt of each data word
    // If more than 64 data words are written, data word addresses will "roll over" and previous data will be overwritten

    for (i = 0; i < len; i++)
    {
        // How to increment address in data structure?
        I2caRegs.I2CDXR = *data++; 
    }

    // After page write operation is complete, execute stop condition
    stopCondition();
}

当我尝试使用我的参数调用此函数时..

eeprom_write(0, &eepromParameters, sizeof(eepromParameters) );

我收到了不兼容的类型错误：

error #169: argument of type "EEPROM_PARAMETERS *" is incompatible with parameter of type "Uint16 *"

我的下一个想法是，我需要一个中间人将它们组合在一起并使其成为兼容的匹配。请问我能尝试什么提示？谢谢

Answer 1

问题是数据的声明和使用。如果您将其声明为

void eeprom_write(Uint16 address, EEPROM_PARAMETERS* data, Int16 len);

并将其命名为

eeprom_write(0, &eepromParameters, sizeof(eepromParameters));

它会落在

中

*data++

因为它将增加EEPROM_PARAMTERS的大小。如果原型声明为

void eeprom_write(Uint16 address, UInt16* data, Int16 len);

需要将其称为

eeprom_write(0, &eepromParameters.ee_Speed_Control_Mode, sizeof(eepromParameters) / sizeof(Uint16));

这假设EEPROM_PARAMETERS中的所有内容都是Uint16。另一种方法是使用枚举。

enum EEOffsets
{
    ee_Speed_Control_Mode,
    ee_Motor_Type,
    ee_Max_Electrical_Speed,
    ee_Carrier_Frequency,
    ...
    ee_Max
};

// Initialize the parameters
Uint16 eepromParameters[ee_Max] = { ... };

// If you need to assign
eepromParameters[ee_Carrier_Frequency] = 85;
...
eeprom_write(0, eepromParameters, ee_Max);

使用指针访问typedef结构

1 个答案: