Arduino的11.0592MHz的处。修改定时器0，delayMicroseconds（） [英] Arduino at 11.0592MHz. Modify Timer0, delayMicroseconds()

问题描述

我使用ATMEGA328P在为11.0592MHz与Arduino的环境。我认为该delayMicroseconds（）函数是约27％的太快。其原因是，在wiring.c的code假定撒尿时钟现在为8MHz。

现在我尝试修复它。我发现不同的职位，但我不知道什么是最Arduino的兼容的方式。有什么可以推荐的吗？

1. 乘以wiring.c变量我们1.27如果F_CPU是11.0592MHz的？很容易，但只影响delayMicroseconds而不是米利斯（），百万分之一（），延时（）等。


2. 也许从64更改preSCALE因素???

其他的想法或导游？

感谢您提前。

菲利克斯

解决方案

Arduino的方法是让您的主板的自定义平台，新F_CPU速度。核心库应通过携带这种F_CPU。

这是很容易的，通过做一个boards.txt文件，你的不同。该文件（两者相同）的位置是在两个电流IDE的不同。在的情况下的Arduino IDE 1.0.5：

  

C：\\用户\\ mflaga \\文档\\的Arduino \\五金\\ myArduino11MgHz \\ boards.txt

和在1.5.5的情况：

  

C：\\用户\\ mflaga \\文档\\的Arduino \\五金\\ myArduino11MgHz \\ AVR \\ boards.txt

如果你的情况草图目录将是不同的。

 ＃请参阅：HTTP：//$c$c.google.com/p/arduino/wiki/Platforms################################################## ############myArduino11MgHz.name = Arduino的11MgHzmyArduino11MgHz.vid.0 = 0x2341
myArduino11MgHz.pid.0 = 0x0043
myArduino11MgHz.vid.1 = 0x2341
myArduino11MgHz.pid.1 = 0×0001myArduino11MgHz.upload.tool = AVRDUDE
myArduino11MgHz.upload.protocol =的Arduino
myArduino11MgHz.upload.maximum_size = 32256
myArduino11MgHz.upload.maximum_data_size = 2048
myArduino11MgHz.upload.speed = 115200myArduino11MgHz.bootloader.tool = AVRDUDE
myArduino11MgHz.bootloader.low_fuses = 0xFF的
myArduino11MgHz.bootloader.high_fuses =写0xDE
myArduino11MgHz.bootloader.extended_fuses = 0×05
myArduino11MgHz.bootloader.unlock_bits = 0x3F的
myArduino11MgHz.bootloader.lock_bits =为0x0F
myArduino11MgHz.bootloader.file = optiboot / optiboot_atmega328.hexmyArduino11MgHz.build.mcu = ATMEGA328P
myArduino11MgHz.build.f_cpu = 11059200L
myArduino11MgHz.build.board = AVR_myArduino11MgHz
myArduino11MgHz.build.core =的Arduino：Arduino的
myArduino11MgHz.build.variant = Arduino的：标准################################################## ############
 

下面是href=\"http://sourceforge.net/projects/arduinobdeditor/\" rel=\"nofollow\">第三方GUI编辑的board.txt的

免责声明。以上并编译和正常工作的。在那里我有没有实际测试过，并加载到一个单位。

---

这是说，我希望bootloader的F_CPU不匹配。有三种可能的解决方案，以本

第一;在optiboot加载器应该有一个相应的目标有以下偏差：

  

\\ Arduino的1.5.5 \\五金\\ Arduino的\\ AVR \\引导程序\\ optiboot \\ Makefile文件

  myArduino11MgHz：AVR_FREQ = 11059200L
 

二;更改boards.txt上传速度以匹配= 115200变化*（一千六万分之一千一百○五万九千二）。

  myArduino11MgHz.upload.speed = 79626
 

这是一个非一般的波特率，无论是AVRDUDE或串行端口可支持它。

第三;不要使用启动加载，通过经由ISP编程上传

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我也同样计划做出板具有不同F_CPU，但实际上只作出定制板，具有相同的速度。我会很好奇，想知道如果以上实际工作，你的情况。

I am using the ATMega328P at 11.0592MHz with the Arduino environment. I recognized that the delayMicroseconds() function is about 27% too fast. The reason is, that the code in wiring.c assumes that the clock peed is now 8MHz.

Now I try to fix it. I found different posts but I am not sure what is the most Arduino compatible way. What can you recommend?

1. Multiply the variable "us" in wiring.c with 1.27 if the F_CPU is 11.0592MHz? Easy but only affects delayMicroseconds and not millis(), micros(), delay(), etc.
2. Change the prescale factor maybe from 64 to ???

Other ideas or guides?

Thank you in advance.

Felix

解决方案

The Arduino way would be to make a custom PLATFORM for your board with that of the new F_CPU speed. The core libraries should carry this F_CPU through.

This is easy enough, by making a boards.txt file with your differences. Where the location of the file (same between the two) is different between the two current IDE's. In the case of Arduino IDE 1.0.5:

C:\Users\mflaga\Documents\Arduino\hardware\myArduino11MgHz\boards.txt

and in the case of 1.5.5:

C:\Users\mflaga\Documents\Arduino\hardware\myArduino11MgHz\avr\boards.txt

Where in your case the sketch directory would be different.

# See: http://code.google.com/p/arduino/wiki/Platforms

##############################################################

myArduino11MgHz.name=Arduino 11MgHz

myArduino11MgHz.vid.0=0x2341
myArduino11MgHz.pid.0=0x0043
myArduino11MgHz.vid.1=0x2341
myArduino11MgHz.pid.1=0x0001

myArduino11MgHz.upload.tool=avrdude
myArduino11MgHz.upload.protocol=arduino
myArduino11MgHz.upload.maximum_size=32256
myArduino11MgHz.upload.maximum_data_size=2048
myArduino11MgHz.upload.speed=115200

myArduino11MgHz.bootloader.tool=avrdude
myArduino11MgHz.bootloader.low_fuses=0xFF
myArduino11MgHz.bootloader.high_fuses=0xDE
myArduino11MgHz.bootloader.extended_fuses=0x05
myArduino11MgHz.bootloader.unlock_bits=0x3F
myArduino11MgHz.bootloader.lock_bits=0x0F
myArduino11MgHz.bootloader.file=optiboot/optiboot_atmega328.hex

myArduino11MgHz.build.mcu=atmega328p
myArduino11MgHz.build.f_cpu=11059200L
myArduino11MgHz.build.board=AVR_myArduino11MgHz
myArduino11MgHz.build.core=arduino:arduino
myArduino11MgHz.build.variant=arduino:standard

##############################################################

Here is a 3rd party GUI Editor of the board.txt.

Disclaimer. The above does compile and should work fine. Where I have not actually tested and loaded into a unit.

---

That said, I would expect the bootloader's F_CPU not to match. There are three possible solutions to this.

First; the optiboot loader should have a corresponding target with the below deviation:

\arduino-1.5.5\hardware\arduino\avr\bootloaders\optiboot\Makefile

myArduino11MgHz: AVR_FREQ = 11059200L

Second; Change the boards.txt upload speed to match the change of =115200*(11059200/16000000).

myArduino11MgHz.upload.speed=79626

This being a non typical baud rate, either avrdude or the serial port may support it.

Third; Don't use the bootload, by uploading via the ISP programmer.

---

I have likewise planned to make a board with a different F_CPU, but only actually made custom boards, with the same speed. I would be curious to know if the above actually works, in your case.

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