嵌入式C strcpy仅复制前10个字节

Question

使用memcpy或strcpy时，我在Atmel Studio中遇到问题。当开关评估为TYPE3时，仅复制前10个字节。当案例的顺序相互交换时，其他strcpy的工作就会完成。我真的不明白为什么这会有所作为，以及为什么简单的strcpy无法使用。任何帮助表示赞赏。

t_RdmPacket在包含文件中定义：

typedef union T_RdmPacket
{
    uint8_t Slot[257];  // Maximale grootte Packet = 255 bytes, + 2 Checksum bytes
    struct
    {
        uint8_t Preamble[8];
        uint8_t ManIDMsbOr0xAA;
        uint8_t ManIDMsbOr0x55;
        uint8_t ManIDLsbOr0xAA;
        uint8_t ManIDLsbOr0x55;
        uint8_t ProdIDMsbOr0xAA;
        uint8_t ProdIDMsbOr0x55;
        uint8_t ProdIDLsbOr0xAA;
        uint8_t ProdIDLsbOr0x55;
        uint8_t SerNrMsbOr0xAA;
        uint8_t SerNrMsbOr0x55;
        uint8_t SerNrLsbOr0xAA;
        uint8_t SerNrLsbOr0x55;
        uint8_t ChecksumMsbOr0xAA;
        uint8_t ChecksumMsbOr0x55;
        uint8_t ChecksumLsbOr0xAA;
        uint8_t ChecksumLsbOr0x55;
    } DiscoveryResponse;
    struct
    {
        uint8_t StartCodeRDM;       //Slot 0
        uint8_t SubStartCode;       //Slot 1
        uint8_t MessageLength;      //Slot 2                Min 24, Max 255
        struct
        {
            uint16_t    ManID;      //Slot 3 & 4    /   9 & 10
            uint16_t    ProdID;     //Slot 5 & 6    /   11 & 12
            uint16_t    SerNr;      //Slot 7 & 8    /   13 & 14
        } Destination, Source;
        uint8_t     TransactionNumber;  //Slot 15
        uint8_t     ResponseType;       //Slot 16
        uint8_t     MessageCount;       //Slot 17
        uint16_t    SubDevice;          //Slot 18 & 19
        uint8_t     CommandClass;       //Slot 20
        uint16_t    ParameterID;        //Slot 21 & 22
        uint8_t     PDL;                //Slot 23           Min 0, Max 231
        uint8_t     ParameterData[231]; //Slot 24 t/m 254
        uint16_t    Checksum;           //Slot 255 & 256
    } Packet;
} t_RdmPacket;

然后处理数据包：

t_RdmPacket Rdm;

void sendGetDeviceModelDescriptionResponse(uint8_t *uid) {
    uint16_t checkSum;
    memset(Rdm.Packet.ParameterData, 0, 231);
    uint8_t size = 0;
    const char* text1 = "1234567890123456";
    const char* text2 = "6543210987654321";
    const char* text3 = "123456789012345";
    const char* responderText = "Multi RDM Responder";
    const char* dummyText = "Dummy RDM Responder";

    if (slaveDevice == -1) 
    {
        strcpy((char*)Rdm.Packet.ParameterData, responderText);
        size = 19;
    }
    else
    {
        switch(SlaveResponder[slaveDevice].DeviceModelID)
        {
            case TYPE1:
                strcpy((char*)Rdm.Packet.ParameterData, text1);
                size = 16;
                break;
            case TYPE2:
                strcpy((char*)Rdm.Packet.ParameterData, text2);
                size = 16;
                break;
            case TYPE3:
                strcpy((char*)Rdm.Packet.ParameterData, text3);
                size = 15;
                if (Rdm.Packet.ParameterData[11]==0)
                {
                    // I get here, I don't know why..
                    PORTD SET_B(3); // Debug LED On
                }
                break;
            default:
                strcpy((char*)Rdm.Packet.ParameterData, dummyText);
                size = 19;
                break;
        }
    }

    createRdmHeader(uid);
    Rdm.Packet.ResponseType = RESPONSE_TYPE_ACK;
    Rdm.Packet.CommandClass = GET_COMMAND_RESPONSE;
    Rdm.Packet.PDL = size;

    Rdm.Packet.MessageLength = 24 + Rdm.Packet.PDL;
    checkSum = calculateCheckSum();
    Rdm.Slot[Rdm.Packet.MessageLength] = (checkSum & 0xFF00) >> 8;
    Rdm.Slot[Rdm.Packet.MessageLength + 1] = checkSum & 0x00FF;

    setWaitTimer();
}

Answer 1

我将扩大我的评论。AFAIK我知道函数strcpy（）有两个参数strcpy（char * to，char * from），其中to和from是地址。您使用了确切的字符串，也许没有警告，因为您的IDE禁用了它。确保在编译时使用-Wall。

我认为您应该尝试使用某些const char * constant_value = "5432154321543215"，而不是使用第二个参数作为字符串调用strcpy。对我来说很难说您的strcpy实现是什么。

起初，我要确保您能从编译中看到所有警告。