Statement CAN news

Use keywords message Statement can news , There are several ways ：

message 0xA m1; // With news id Statement can news 
message 100 m2; // With news id Statement can news 
message EngineData m3;   // Use the... Loaded on the bus dbc The message name declaration in the database can news   

If you use messages id Statement can news , news id It can be 10 Base or 16 Base number . Some people think that 10 Into the system and 16 Is there a difference between base numbers , In fact, for numbers , Different base numbers are just written differently , The carry mechanism is different , The number size is the same

If you use dbc The message name declaration in the database can news , Must be loaded dbc file

can News id According to the length , It is also divided into standard frame and extended frame . Standard frame id by 11 individual bit, Extended frame id by 29 individual bit, So if you want to according to the frame id To declare the extended frame , Need to be in frame id Back plus x

 
message 100x msg1; // news id Back plus x, Represents the extended frame   
message 0x123456x msg2;   

If you want to declare can news , But you're not sure can News id How much is the , You can declare to use “*” No. declares any id The news of

message * msg1;  

Declare no frame id Of can news , Mostly used for uncertain frames id Or to store can news

But if you want to pass output Function can Messages are sent to the bus , Messages must be added id

message * msg1;
msg1.dlc = 8;
output(msg1);

What if I want to declare more than one message at a time ？

We know that the combination of multiple elements is called an array ,