Difference between revisions of "Completing Tutorial with CW1173"

Programming the Example

Note with the CW1173 you need to configure a clock before programming of the device will succeed. Programming of the target device will be done as part of the CW-Capture software setup, discussed next.

Communicating from CW-Capture Software

Next, open the CW-Capture software. Then perform the following steps:

1. Switch to the Python Console tab.
2. The script selection window (2) lists available example scripts. Scroll down to "connect_cwlite_simpleserial.py" and click on it.
3. You will see the script contents appear in the "Script Preview" window (3). You can either hit the "Run" button or double-click the filename of the script to execute it. Do either of those now.

The window should change to indicate the connect succeeded:

4. The console lists the exact script that is executed. Note you could have manually executed the script commands line-by-line in this console.
5. The "Scope" and "Target" buttons will show as connected.
6. The Status Bar will show a connection.

Note in previous software versions, this tutorial took you through manual setup. This can still be done (using the GUI), but instead now the API has been made more powerful, so the example configuration script will be used instead.

To do so, simply scroll down and select the "setup_cwlite_xmega_aes.py" file:

 1 scope.gain.gain = 45
 2 scope.adc.samples = 3000
 3 scope.adc.offset = 1250
 4 scope.adc.basic_mode = "rising_edge"
 5 scope.clock.clkgen_freq = 7370000
 6 scope.clock.adc_src = "clkgen_x4"
 7 scope.trigger.triggers = "tio4"
 8 scope.io.tio1 = "serial_rx"
 9 scope.io.tio2 = "serial_tx"
10 scope.io.hs2 = "clkgen"

Line 1: Sets the input ADC gain

Line 2: Sets the number of samples to record as 3000 samples long (this is normally used for the AES algorithm).

Line 3: Sets an offset of 1250 samples from the trigger to when we start recording samples.

Line 4: Sets the trigger as being a "rising edge" trigger.

Line 5: Sets the internal clock generator to 7.37MHz

Line 6: Sets the ADC as running at 4x that clock (so 29.48MHz)

Line 7: Sets the trigger pin as GPIO4 (we previously set the trigger condition as rising edge, so this pin will be the one a rising edge is expected on).

Line 8: Configures GPIO1 as the RX (Input). This is what the XMEGA target expects.

Line 9: Configures GPIO2 as the TX (Output). This is what the XMEGA target expects.

Line 10: Sets the "High-Speed 2" (HS2) pin as having the 7.37MHz clock output.

14. You can now program the XMEGA device! To do so, open the XMEGA Programmer from the Tools menu:

    

15. Hit the Check Signature button and confirm the device is detected. If not you may have issues with the clock setup.

    

16. Using the Find button, navigate to the simpleserial-base-cw303.hex which you built earlier with the make command. You can then press the Erase/Program/Verify button, and confirm the file is programmed into the XMEGA device:

    

    Note the programmer dialog not only shows the successful programming status, but also shows when the .hex file was last modified. Always confirm this matches with when you last remember compiling the program -- if it is widely different this suggests you have selected the wrong file!

    Finally we can check communications with the programmed file:

17. Close the XMEGA programmer dialog.
18. Open the status monitor under Tools > Encryption Status Monitor.
19. Resize the monitor window. The monitor will show sent & received data to the target.
20. Hit the Run 1 button (). You may have to hit it a few times, as the very first serial data is often lost. You should see data populate in the Text Out field of the monitor window. Note that each byte of the Text In is incremented in the Text Out field.