| << Chapter < Page | Chapter >> Page > |
This module describes how to create a Code Composer Studio (CCS) v4 project that executes a simple assembly program. The module does not explain the code in the project files. The project does not use DSP/BIOS and runs on the TI simulator. In this project the processor used is the TMS320C67xx but the process should work for other processors as well.
To create a CCS project select File->New->CCS Project .
This will bring up a window where you can enter the name of the project. The location selected is the default location for project files. Press Next .
Since the example uses the TMS320C67xx processor the project type selected is C6000 . The project configurations are Debug and Release . Select the Next button.
If there are any project dependencies they are selected on the next screen. Select the Next button.
On the Project Settings Screen , select the items that pertain to the type of project to be created. Since the project will be executed select Output Type: Executable . The processor type is TMS320C67xx so the Device Variant is Generic C67xx Device . This project will use Little Endian . The code generation tools are the latest version (in this case TI v7.0.3). The runtime support library is selected to match the device variant and the endianness selected. The library can be selected automatically. Press Next .
Since this project will have assembly programs only, select the Empty Assembly-only Project . Select Finish and the project will show up in the C/C++ Projects view.
There are three files that will be added to the project. One,
main.asm , will contain the assembly program we want to execute. The file
vectors.asm will contain the code that gets executed when the reset interrupt occurs. The file
link.cmd will be the linker command file that tells the linker where section of memory are located and where to put the code in the memory map.
Create the main.asm file that conains the assembly program to execute. Select File->New->Source File .
The New Source File dialog opens and you can enter the source file name. Add a .asm extension for an assembly program file. The source folder should be the folder of your project. Select Finish and a new file is opened.
Enter the assembly code shown below in
main.asm .
; Example assembly file
; Multiply two numbers.text ; Indicates that what follows is code
.def _c_int00; This symbol is defined in this file; but used in another file
_c_int00: MVK .S1 0x34,A1 ; Put a number in register A1MVK .S1 0x25,A2 ; Put a number in register A2
MPY .M1 A1,A2,A1 ; Multiply two numbers in A1 and A2NOP
NOPNOP
NOPNOP
When a reset interrupt occurs in a C6000 processor the system will start executing the code located at the interrupt memory location. There are only 8 instructions at each interrupt vector. If a long program is to be executed then the interrupt vector needs to branch to the program location. This is done by using a resect vector program.
Create a new file named
vectors.asm and enter the following code.
.ref _c_int00 ; name of the label where
; the program is located.sect"vectors" ; this will put this code
; in the vectors memeory sectionreset: mvkl.s2 _c_int00,b0 ; put the address in b0
mvkh.s2_c_int00,b0b .s2 b0 ; branch to the program
nopnop
nopnop
nopnop
The linker command file tells the linker information about the memory map and where to put parts of the code like data and program instructions. Create a new file named
link.cmd and enter the following code.
MEMORY
{VECS : origin = 0x00000000 length = 0x00000220
IPRAM : origin = 0x00000240 length = 0x0000FDC0}
SECTIONS{
vectors>VECS
.text>IPRAM
}
In order to build and run your project you need to have a target configuration. This file will contain information about the emulator that will be used and the target processor. In this module the target configuration will be the TI simulator for the C6713 processor. First select File->New->Target Configuration File .
In the New Target Configuration dialog enter the configuration file name ending in the .ccxml file extension. Put the file in the project directory. Select Finish and a new target configuration file opens.
In the configuration, select the connection needed (simulator or some type of emulator, etc.) and the type of device. In this example the TI simulator is used with the C67xx little endian simulator device. Select Save when done.
Now the target configuration is in the project.
To start a debug session either select Target->Debug Active Project or press the debug icon in the menu bar.
When the debug session starts the code files are compiled and linked into an executable file and the file is loaded onto the target. The reset vector code should be located at memroy location 0x0.
If your window is small, CCS may not have room to open all windows. In this case your debugging window may look like the following figure.
Note that the window where the program files are located may not show much (circled in red). In this case you will need to expand the window.
Begin executing the code by stepping through the code using the Assembly Step Into button.
The code should execute until the branch instruction finishes executing and then it should jump to the main function located at a different memory location.
Notification Switch
Would you like to follow the 'Dsp lab with ti c6x dsp and c6713 dsk' conversation and receive update notifications?
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|