CAPL常见问题

一、capl程序组织

1、全局变量的声明
–you declare variables that can be read or changed by any part of your CAPL program.

在程序的任何部分都可以读取和修改。
–It is a good idea to declare messages and timers in this section.
适合定义messages和timers。

2、事件处理
–Event procedures are blocks of code that are executed when an event occurs.

事件发生时执行。
–CAPL allows you to define event procedures for several different kinds of events.

可以为多个不同的事件定义事件处理
–Most of your program code will be in event procedures, since most actions are performed after an event, such as a message being received on the CAN bus.

大多数代码都写在事件处理中。
–Event procedures cannot return a value.

事件处理不能有返回值。

3、用户定义函数
–Your programs can contain procedures that can be used to complement CAPL’s built-in functions. 
–These procedures can contain any legal CAPL code and are globally accessible. 
–Putting frequently-used code in a procedure makes programs more efficient. 
–User-defined functions can return a value of any simple type.

可以有返回值。

二、CAPL文件类型

★两种

*.CAN      包含CAPL程序（ASCII 文本格式）

*.CBF      编译.CAN文件得到（二进制文件），只能被CANslyzer或CANoe执行。

三、CAPL数据类型

char 8bit unsigned

byte 8bit unsigned

int  16bit signed

word 16bit unsigned

long 32bit  signed

dword 32bit unsigned

float 64bit signed

double 64bit signed

message 一条通信消息

timer 秒级计时器

msTimer 毫秒级计时器

四、运算符

(雷同c语言，只列部分)

位操作部分：

<<

>>

<<=          compound assignment(left shift)

>>=            compound assignment(right shift)

&=                AND

^=                 XOR

|=                  OR

五、控制结构

1、if()

      {

       }

      else

     {

     }

2、switch()

      {

          case :

          default:

     }

3、while()

{}

4、do{}while();

5、for(;;){}

6、break & continue

7、this