[英]Why are my variables in my struct changing?
I am trying to set up an SD card on an Intel Board D2000 Quark. 我正在尝试在Intel Board D2000 Quark上设置SD卡。 The problem, I am encountering is that my variables in my struct change at a certain point in the program. 我遇到的问题是结构中的变量在程序中的某个点发生了变化。 I figured out when the variables are changing but I do not have an idea how to fix it. 我弄清楚了变量何时更改,但是我不知道如何解决它。
The reason I am using C instead of C++ is that the compiler of Intel Microcontrollers Studio does not let my use C++. 我使用C而不是C ++的原因是Intel Microcontrollers Studio的编译器不允许我使用C ++。
Below, I copied some of the relevant code. 在下面,我复制了一些相关代码。
SD* sdCard;
uint8_t readData(uint32_t block, uint16_t offset, uint16_t count, uint8_t* dst){
if(count == 0){
return true;
}
if((count + offset) > 512){
goto fail;
}
if(!sdCard->inBlock_ || block != sdCard->block_ || offset < sdCard->offset_){
sdCard->block_ = block;
if(sdCard->type_ != SD_CARD_TYPE_SDHC){
block <<=9;
}
uint8_t result = sendCommand(CMD17, block);
if(result){
goto fail;
}
if(!waitStartBlock()){
goto fail;
}
sdCard->offset_ = 0;
sdCard->inBlock_ = 1;
}
for(; sdCard->offset_ < offset; sdCard->offset_++){
spiRecieve();
}
for(uint16_t i = 0; i < count; i++){
dst[i] = spiRecieve();
}
sdCard->offset_ += count;
if(!sdCard->partialBlockRead_ || sdCard->offset_ >= 512){
readEnd();
}
QM_PUTS("RD FINISH");
return true;
fail:
QM_PUTS("RD FAIL");
return false;}
The moment the variables change is sdCard->block_ = block;
变量更改的时刻为sdCard->block_ = block;
. 。 First it is a certain value. 首先,它是一定值。 After this statement the value is 0xFFFFFFFF; 在该语句之后,值为0xFFFFFFFF; This happens to every variable in the struct. 这发生在结构中的每个变量上。
My struct looks like this: 我的结构看起来像这样:
typedef struct SDcard{
uint32_t block_ ;
uint8_t errorCode_;
uint8_t inBlock_;
uint16_t offset_;
uint8_t partialBlockRead_;
uint8_t status_;
uint8_t type_;
}SD;
Update for the comments: This is my temporary main: 更新评论:这是我的临时主干:
SD sdCard;
int main(void)
{
if(!SDInit(&sdCard)){
QM_PRINTF("ERROR1\n");
}
while(1){}
}
If anyone knows a solution or has some questions, please let me know. 如果有人知道解决方案或有任何疑问,请告诉我。
You are improperly initializing sdCard
. 您不正确地初始化sdCard
。 Currently you are assigning the value of sdCard
to be a pointer to its own location on the stack. 当前,您正在将sdCard
的值分配为指向其在堆栈中的位置的指针。 Instead, do SDInit(malloc(sizeof(SD)));
而是执行SDInit(malloc(sizeof(SD)));
. 。
Personally, I would not even have that initialization function. 就个人而言,我什至没有该初始化功能。 I would just do SD * sdCard = malloc(sizeof(SD));
我只是做SD * sdCard = malloc(sizeof(SD));
EDIT: In response to Peter's point, you could also do this and ignore the instantiation function: 编辑:响应彼得的观点,您也可以这样做,并忽略实例化函数:
SD sdCard;
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