变量位置PIC32MX XC32意外结果

大家好，我一直是PIC用户，但最近才开始使用PIC32。目前我正在开发一个PIC32 MX230F064 B项目。我使用MPLAB X 3.5和XC32 V1.42和代码配置器V3。我有一个简单的功能，试图通过IO引脚写HT1380。这不是中断程序。我有一个定时器中断，但似乎并没有改变结果。我的问题是一个变量意外地改变了它的内容。我用函数0x8e调用函数，用于“命令”。当我在调试过程中检查变量时，首先看到函数取值0x8e，然后在几个指令之后，在使用数据之前，值变为0x01。在调试过程中，我可以看到变量存储在“R04（CPU）”中。我可以把数据作为一个解决方案移动到一个新的变量，但我想知道发生了什么。我做错什么了？谢谢您！



      以下为原文

    Hello everyone,

I've been a long time PIC user but have only recently started using PIC32. Currently I'm using a PIC32MX230F064B on a project I'm developing. I'm using MPLAB X 3.5 and XC32 V1.42 and Code Configurator V3.

I have a simple function that attempts to write a HT1380 through IO Pins. It's not on an interrupt routine. I've have a timer interrupt but it doesn't seem to change the results. My issue is that a variable changes its content unexpectedly.

I call the function with the argument 0x8E for "command". When I check the variable during debugging I see that the function takes the value 0x8E at first, then after a few instructions the value changes to 0x01 before I get to use the data. During debugging I can see that the variable is stored in "r04 (CPU)". I can move the data to a new variable as a workaround, but I would like to understand what's going on. What am I doing wrong?

Thank you!


Clock_Write(0x8E, 0x00);                                // Write Protect OFF

void Clock_Write (uint8_t command, uint8_t data)
{
    unsigned char i;
   
    CLK_IO_SetLow();
    CLK_SCK_SetLow();
    CLK_CS_SetHigh();
   
    CLK_IO_SetDigitalOutput();
   
    for(i=0;i<8;i++)
    {
        CLK_SCK_SetLow();

        if((command >> i) & 1)
            CLK_IO_SetHigh();
        else
            CLK_IO_SetLow();
        
        CLK_SCK_SetHigh();
    }
   
    for(i=0;i<8;i++)
    {
        CLK_SCK_SetLow();

        if((data >> i+1) & 1)
            CLK_IO_SetHigh();
        else
            CLK_IO_SetLow();
        
        CLK_SCK_SetHigh();
    }
   
    CLK_IO_SetLow();
    CLK_SCK_SetLow();
    CLK_CS_SetLow();
   
    return;
}