PIC18F47K40的阵列初始化问题

你的MPLAB X IDE版本是什么？我刚在V3.50上试用过，看起来不错。



      以下为原文

    what's your MPLAB X IDE version?  I just tried it on v3.50, it looks OK.

如果您的代码还没有实际使用数据，那么这证明不了什么。优化编译器可以随意丢弃任何没有用处的代码。



      以下为原文

   
This proves nothing if your code doesn't actually USE the data yet.
Optimising compilers are free to throw away any code which doesn't do anything useful.
 

我也使用相同的MPLABX V3.50。我的代码是工作的还是你做的任何改变？像头文件还是不同的初始化？



      以下为原文

    I am also using same MPLabX v3.50. Is my same code is working or any changes you have done? like header files or different initialisation?

只是很简单，编译器是XC8 1.38。



      以下为原文

    just very simple,
#include
unsigned int array[] = {0,1,10,100,1000};
void main()
{
   array[0]=1;
   while(1){}
}

compiler is XC8 1.38.

试试这个



      以下为原文

    Try this
#include
unsigned int array[] = {0,1,10,100,1000};

void main()
{
    array[0]=1;
    {
        volatile int dummy;
        unsigned char idx;
        for (idx=0; idx < 5; idx++)
            dummy = array[idx];    //this will always be done because dummy is "volatile"
    }
   while(1){}
}
 

对于‘K40系列’中的所有芯片，有一个重要的差错。对于XC8版本1.38，您需要Errata文档DS80000712BThat的第3.1节中所示的解决方法：在项目中创建一个新文件，powerup.as。（但是：请参阅下面的编辑信息。）以下是我放入该文件的内容：如果没有此修复，全局初始化将无法工作，并且许多其他内容将无法工作。（任何访问程序内存中的数据的东西，比如printf()，例如)Note:[/Begin Edit]Release notes for XC8 version 1.40表明以下内容应该修复它，但是对我不起作用：向项目Properties->XC8 Global Options->XC8编译添加以下命令行选项r->Additional Options行--ERRATA=NVMREGSo，我仍然使用如Errata中所示的powerup.作为修复，甚至对于XC8版本1.40。使用XC8版本1.40和以后版本进行修复的正确方法是：在Project Properties XC8全局选项->XC8 Linker->AdditionalOption选项中输入+nvmreg也就是说，它是一个链接器选项，而不是编译器选项。（哈扎！）最后，Errata文档指出硅修订版A4不需要，但是我没有任何这样的芯片要测试。两者都处于“自由”模式。注意，除了裸金属硬件和软件之外，我没有使用模拟器、调试器或其他任何工具进行测试：使用printf()验证内存内容和其他功能的、以全速生产发行版运行的真实芯片。



      以下为原文

    There is an important erratum for all chips in the 'K40 family.
 
With XC8 version 1.38, you need the workaround shown in Section 3.1 of the Errata document DS80000712B
 
That is:
 
Create a new file, powerup.as, in your project.  (But: See edited information below.)
 
Here's what I put in that file:
    ;
    ;
    ; From Errata document DS80000712B for the PIC168F27K40
    ;
    ; From davekw7x: This workaround is still necessary
    ; as of XC8 version 1.40  (December 14, 2016)
    ;
    #include
    
    global    powerup,start
    psect    powerup,class=CODE,delta=1,reloc=2
powerup:
    bsf NVMCON1, 7;  From errata document DS80000712B
    goto    start
    end

 
Without this fix, global initialization won't work, and a lot of other stuff won't work.  (Anything that accesses data in program memory, like printf(), for example)
 
 
Note:
 [/Begin Edit]
Release notes for XC8 version 1.40 indicate that the following should fix it, but it didn't work for me:
 
Add the following command-line option to the project Properties->XC8 Global Options->XC8 compiler->Additional Options line
 
--ERRATA=NVMREG
 
So I am still using the powerup.as  fix as shown in the Errata, even for XC8 version 1.40.
 
The proper way to do it with XC8 version 1.40 and later is the following:

• Enter +nvmreg in the Project Properties XC8 global options->XC8 Linker->Additional Options->Errata box
  

That is, it's a Linker option, not a Compiler option.
 
Bottom line: With recent compiler versions you don't need  powerup.as  any more.  (Huzzah!)
[/End Edit]
 
Finally,
The Errata document indicates that is not necessary for silicon revision A4, but I don't have any such chips to test.
 
Bottom line:
Tested on my MPLABX version 3.50 PIC18F27K40 project with XC8 version 1.38 and version 1.40.  Both in "Free" mode.  Note that I did not test with simulator or debugger or anything other than bare-metal hardware and software: Real chip running with production release at full speed,  using printf() to verify memory contents and other functionality.
 
 
Regards,
 
Dave

最近出现的：HTTP://www. McCHIP.COM/FUMMS/FUNDSPE/96223



      以下为原文

   
That comes up recently: http://www.microchip.com/forums/FindPost/964223

请您共享PIC18F47 K40初始化的源代码。



      以下为原文

    Please can you share your source code for initialization of PIC18F47K40.

最后，数组初始化是固定的。



      以下为原文

    Finally Array initialization is fixed..