xPC Target

I/O Port Write

Intel 80x86 and compatible processors have a special address space reserved for I/O devices. To access this address space and communicate directly to a device, xPC Target provides the I/O Port Read and I/O Port Write blocks. These blocks enable the transfer of data from and to the I/O ports. See also, I/O Port Read.

1. Double click the I/O Port Write block.

1. The Block Parameters: I/O Port Write dialog box opens.

2. Enter the parameters.

1. For example, if you want to write a double word (32 bits) starting at I/O port 0x300, followed by a word (16 bits) at 0x304, enter

   • {'0x300','0x304'}
     

   Your dialog box should look similar to the figure shown below.

   

3. Click OK.

1. The number of inputs to the block changes to reflect the length of the
   I/O-Port address cell array. The data type of the input signal reflects the type of value written to the I/O port.For example, an input signal of type uint32 writes a double word, an uint16 input signal writes a word, and an uint8 input signal writes a byte.

Block Parameters	Description
I/O-Port address (cell array)	This is the cell array containing the I/O port addresses for the data that you want read. These addresses are specified in terms of hexadecimal strings.
Sample time	Enter a base sample time or a multiple of the base sample time.

I/O Port Read

xPC Target TET