Debug the D command in the VxWorks System

 

First, we will introduce the following examples:

-> D 0x7c400000 + 0x1*4, 1, 4

Parameter 1: Access address (generally base address + offset address). The offset address is related to the CPU chip selection width.

Second parameter: Number of access registers

Third parameter: data width, which affects address access pointers

 

First, determine the address access pointer type based on the third parameter and select the appropriate access pointer.

Second, align the entered addresses

Finally, read the corresponding data.

 

From these introductions, we can see the code implementation of the d command:

Unsigned short Reg = * (volatile unsignedshort *) (0x38000000 + 0x25*2 );

2 ---- the width of the CPU chip is 16 bits

Volatile unsigned Shor ---- the data width is 16 bits