Why the External Model of c28x_serial_ext.slx doesn't work?
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Hello, every one.
I'm tring test c28x_serial_ext.slx exmple with my F28335 eZdsp board, with MATLAB 2015a. But I get the error message :
Unable to connect to the 'TI Delfino F2833x' target for 'test3_serial_ext'.
The only difference between my test3_serial_ext model and the exmple c28x_serial_ext.slx provided in MATLAB 2015a is that in the "Target Hardware Resources->External mode" setting，I used COMPort COM3 instead of the default value COM10.
COM3 is a USB-SERIAL CH340 com port in my host computer. I'm wondering that Simulink even doesn't download the test3_serial_ext.out to my eZdsp board:
I first download a standalone executable model to eZdsp which blink the DS2 LED in the board.
While during I run the test3_serial_ext model under external mode, the LED never stopped. Does that mean simulink not download the test3_serial_ext.out to the eZdsp board and run it?
Any one can tell me why I can't run my test3_serial_ext in external mode ?
Sumith Sekharan on 4 Apr 2016
Hi Shiming Liu,
By default example model is configured for F28335 control card with XDS 100 debug interface. If you are using the eZDSP board, select the "$(TARGET_ROOT)/CCS_Config/f28335_eZdsp.ccxml" as the CCS configuration file (Hardware Implementation-> Target Hardware Resources-> Build options -> CCS hardware configuration <file:)>.
If this does not fix the issue please try to connect to your hardware using CCS.
Hope this helps. Thanks, Sumith
More Answers (9)
For F28335 eZdsp board, the USB JTAG emulation does not support serial operation. Hence, along with USB that is used to download the program, user also needs to connect a serial cable from the DB9 connector on the board for SCI-A to the PC COM port to run the external mode. The PC COM port# is COM1.
I could run the external mode on this board by doing this connection. The default settings for SW2 switch were in place.
program name: 'c28x_serial_ext'
Please ensure you have a 'DB9 Male to DB9 Female 9C Serial Straight Thru Cable' for serial connection in case of F28335 eZdsp board.
And SW2 switch position are in default state.
ı use this cablo(https://n11scdn.akamaized.net/a1/450/elektronik/kablolar/usb-to-ttl-uart-seri-kablo-pl2303hx-1m__0661419781734161.jpg) rx to tx and tx to rc is connected . and then this picture(attached) is given by device manager
ı select com 1 port and then this problem is still continiues
Since you are using USB2serial, the COM3 would be your port. Also, try connecting the TX-TX and Rx-Rx and see if this helps. Alternatively, you can first start with SCI operation and ensure basic SCI operation and then move to external mode.
as you said, ı tried tx-tx and rx-rx finally the error is continues . how to firstle use sci operation may you help me please
You can work from code composer and the serial example from controlsuite.