请问固定IO和标准IO之间有什么区别？

我认为“.”的描述措辞非常糟糕。这只是一个猜测，您必须要求CCS编译器作者获得最终的词。CCS不是微芯片产品。我认为它们的意思是“使编译器每次使用时都生成代码来输入或输出I/O引脚”实际上是“将引脚固定为“输入”和“输出”，并且假设每次寻址时它仍然是相同的。也就是说，在初始化之后，它根本不接触TrIS寄存器。我同意你们的说法，它们的措辞含糊不清。



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    I think the description of "fixed" is very poorly worded.
This is just a guess, you would have to ask the CCS compiler authors to get the definitive word. CCS is not a Microchip product.
 
What I think they mean by "cause the compiler to generate code to make an I/O pin either input or output every time it is used" is actually "fix the pin as just an "input" and just an "output", and assume it is still the same every time it is addressed. i.e. it does NOT touch the TRIS register at all after initialisation.
 
I agree with you that their wording is ambiguous.
 

固定的描述似乎违反直觉。例如：根据描述，编译器仍然会在这里生成一个StestTrasiA（）函数吗？如果是这样，那么使用固定而不是允许它默认为标准有什么意义呢？我一定漏掉了什么东西。所有这些模式对我来说都很好，我只是不理解预期的用法。嗨，试试这个……在头文件中或者在m a in.c文件中的顶部：（例如：我正在使用与项目同名的头文件）#use FIXED_IO（A_outputs=PIN_A0）//只有一个引脚是一个固定的输出。如果您使用这个引脚，那么在声明中您就不会修复它。#define LED PIN_A0//这个引脚现在在程序代码中称为LED--//output_bit(LED，1)；//现在这个引脚变高了//同样的是：output_bit(PIN_A0，1)；-分号很重要。output_bit(LED，0)；//现在这个引脚变高了。切换pin output_toggle(LED)；//pintoggles._ms(500)；...output_bit(LED，0)；//pin停止切换，变低，请阅读手册。你也会在PICC Falds.www. CcSnFuff-论坛找到例子。你会发现很多帮助代码。



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The description for Fixed seems counter intuitive. For example:

#use FIXED_IO( A_outputs=PIN_A0 )
.
.
output_high(PIN_A0);

According to the description, the compiler will still generate a set_tris_a() function here? If so, what's the point of using FIXED instead of allowing it to default to STANDARD? I must be missing something.
 
All of these modes are working fine for me, I just don't understand the intended usage I guess.




Hi,
 
try this...
 
in your header file or at the top in your main.c file: (ex: I'm using a header file with the same name of the project)
 
#use FIXED_IO(A_outputs=PIN_A0) // only one pin is a fixed output. If you use this pin also a an input you don't fix it in the declaration.
#define LED PIN_A0 // this pin is now called LED
 
--
//in the program code:
output_bit(LED, 1); //now this pin goes to high
// the same would be:
output_bit(PIN_A0, 1); - semicolon is important
..
output_bit(LED, 0); //now this pin goes to low
output_bit(PIN_A0, 0);
..
// toggle the pin
output_toggle (LED); //the pin toggles
delay_ms (500);
...
output_bit(LED, 0); // the pin stops toggle, goes low, switch off
 
Please read the manual. You'll find also examples in the PICC folders.
www.ccsinfo.com - forum. You'll find a lot of helping codes.
 
Gerald
---
 

好的，我不使用CCS，以下只是基于几个快速搜索的猜测。使用STANDARD_IO，编译器将自动将pin更改为每个输入指令的输入和每个输出指令的输出。非常I/O操作；但是，它将方向设置为指定的值，而不是指令所暗示的值。使用FAST_IO，您负责配置TRIS。基于此，我认为我不希望使用CCS……太多了。我也不明白为什么需要一个字节的RAM &编辑…除非他们在没有内存映射的TIS寄存器的情况下讨论PIC设备？一个RAM用来充当TIS指令的影子。&编辑/gt；



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    Okay, I don't use CCS and the following is just a guess based on a couple quick searches.
 
With STANDARD_IO, the compiler will automatically change the pin to an input for every input instruction and to an output for every output instruction.
 
With FIXED_IO, the compiler still configures the TRIS for every I/O operation; however, it sets the direction to the value you specify, rather than to the one the instruction implies.
 
With FAST_IO, you are responsible for configuring the TRIS.
 
Based on this, I don't think I would like CCS... too Arduino. I also don't understand why a byte of RAM is needed ... unless they are talking about PIC devices without a memory-mapped TRIS register ?? and a RAM is used to act as a shadow for the TRIS instruction.

有趣的东西



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    funny stuff

这将给您提供更高效的代码。



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That will give you more efficient code.