for (index = 0u; index < rxMsgLength; index += 4u) { UT_GlobalRawReceivedData[index ] = (ut_uint8) (msgInfo->data[index/4] & 0x000000FFuL); // modified by talley UT_GlobalRawReceivedData[index + 1] = (ut_uint8)((msgInfo->data[index/4] & 0x0000FF00uL) >> 8); // modified by talley UT_GlobalRawReceivedData[index + 2] = (ut_uint8)((msgInfo->data[index/4] & 0x00FF0000uL) >> 16); // modified by talley UT_GlobalRawReceivedData[index + 3] = (ut_uint8)((msgInfo->data[index/4] & 0xFF000000uL) >> 24); // modified by talley }反过来
时间: 2024-04-10 17:35:05 浏览: 14
如果要将上述代码反过来,将 `UT_GlobalRawReceivedData` 的值赋给 `msgInfo->data`,可以进行如下修改:
```c
for (index = 0u; index < rxMsgLength; index += 4u)
{
msgInfo->data[index/4] = (UT_GlobalRawReceivedData[index ] & 0x000000FFu) |
(UT_GlobalRawReceivedData[index + 1] << 8) |
(UT_GlobalRawReceivedData[index + 2] << 16) |
(UT_GlobalRawReceivedData[index + 3] << 24);
}
```
这样就可以将 `UT_GlobalRawReceivedData` 中的值按照字节顺序重新组合,并赋给 `msgInfo->data` 数组。请确保 `msgInfo->data` 的类型和大小与 `UT_GlobalRawReceivedData` 的类型和大小匹配,以免发生数据溢出或截断的问题。
相关问题
for (index = 0u; index < rxMsgLength; index += 4u) { UT_GlobalRawReceivedData[index ] = (ut_uint8)((msgInfo->data[index/4] & 0xFF000000uL) >> 24);//modified by talley UT_GlobalRawReceivedData[index + 1] = (ut_uint8)((msgInfo->data[index/4] & 0x00FF0000uL) >> 16);//modified by talley UT_GlobalRawReceivedData[index + 2] = (ut_uint8)((msgInfo->data[index/4] & 0x0000FF00uL) >> 8);//modified by talley UT_GlobalRawReceivedData[index + 3] = (ut_uint8) (msgInfo->data[index/4] & 0x000000FFuL);//modified by talley }得到的数据是 10 00 00 40 AA 55 08 41,怎么改成得到的数据为40 00 00 10 41 08 55 AA
要将接收到的数据顺序改为"40 00 00 10 41 08 55 AA",您可以调整数据的复制顺序。修改代码如下:
```c
for (index = 0u; index < rxMsgLength; index += 4u)
{
UT_GlobalRawReceivedData[index ] = (ut_uint8) (msgInfo->data[index/4] & 0x000000FFuL); // modified by talley
UT_GlobalRawReceivedData[index + 1] = (ut_uint8)((msgInfo->data[index/4] & 0x0000FF00uL) >> 8); // modified by talley
UT_GlobalRawReceivedData[index + 2] = (ut_uint8)((msgInfo->data[index/4] & 0x00FF0000uL) >> 16); // modified by talley
UT_GlobalRawReceivedData[index + 3] = (ut_uint8)((msgInfo->data[index/4] & 0xFF000000uL) >> 24); // modified by talley
}
```
通过交换复制数据的顺序,将原先的高字节位移动到低字节位,实现了数据顺序的修改。这样,您将得到"40 00 00 10 41 08 55 AA"的数据顺序。请确保代码中的数据类型和变量名与您的代码相匹配。
for (index = 0u; index < MAX_CAN_DATA_BYTES; index++) { IutTransmittingObject.data[index] = UT_GlobalTransmittingData[index]; }其中前面一个定义是 uint32_t *data; 后面一个定义是ut_uint8 UT_GlobalTransmittingData[MAX_CAN_DATA_BYTES];赋值语句运行之后并没有实现赋值是为什么?要怎么修改?
根据您提供的代码片段,问题可能在于数据类型不匹配。在赋值语句中,您将 `UT_GlobalTransmittingData` 数组的值赋给了 `IutTransmittingObject.data` 数组。然而,`IutTransmittingObject.data` 是一个 `uint32_t` 类型的指针,而 `UT_GlobalTransmittingData` 是一个 `ut_uint8` 类型的数组。
要解决这个问题,您可以通过以下方式修改代码:
1. 将 `IutTransmittingObject.data` 的数据类型更改为 `ut_uint8*`,以匹配 `UT_GlobalTransmittingData` 数组的类型。
2. 更改赋值语句,将 `UT_GlobalTransmittingData[index]` 的值赋给 `IutTransmittingObject.data[index]`。
修改后的代码如下所示:
```c
ut_uint8 *data; // 将 uint32_t* 修改为 ut_uint8*
// ...
for (index = 0u; index < MAX_CAN_DATA_BYTES; index++) {
IutTransmittingObject.data[index] = UT_GlobalTransmittingData[index];
}
```
这样修改后,赋值语句应该能够正确地将 `UT_GlobalTransmittingData` 数组的值赋给 `IutTransmittingObject.data` 数组。请记得在修改代码时确保数据类型匹配,并在需要的地方包含相关头文件。