MATLAB: The External Model of c28x_serial_ext.slx doesn’t work

c2000external mode

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 ?

Thanks.

Best Answer

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

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MATLAB: How to configure a GPIO pin as an external interrupt in a Target Support Package

The attached model configures GPIO0 as external interrupt to trigger the blinking of LED. The custom code in the System Initialize block assigns GPIO0 as an input to trigger the XINT1 interrupt:

EALLOW;                                        
GpioCtrlRegs.GPAMUX1.bit.GPIO0 = 0;            
GpioIntRegs.GPIOXINT1SEL.bit.GPIOSEL = 0;      
EDIS;                                          
XIntruptRegs.XINT1CR.bit.ENABLE = 1;           
XIntruptRegs.XINT1CR.bit.POLARITY = 1;

The ISR toggles the LED based on a rising edge of GPIO00. Connect GPIO to 3V and GND in order to blink the LED.

MATLAB: Do I get a ‘Failed to connect to target’ error when using External Mode with TI Delfino F28335 control card with a Peripheral explorer but not with a docking station

In this case it turned out to be hardware issue on the peripheral explorer side because of an incorrect schematic diagram. This is prevalent with all TI C2000 peripheral explorers.

The schematic for the Peripheral Explorer R5 shows that the USB-SCI path as:

-GPIO-28 -> USB_SCI_RX -> RX
-GPIO-29 -> USB_SCI_TX -> TX

However, it should be:

-GPIO-28 -> USB_SCI_RX -> TX
-GPIO-29 -> USB_SCI_TX -> RX

You can rework the board by cutting these traces and adding some wires to make the correct connections. Please see the corrected schematics attached with the article.

Texas Instruments have logged this as a hardware bug, however, since the board is relatively stable, it may be a while before a revision occurs.

Please refer this link from Texas instrument's forum describing this issue:

https://e2e.ti.com/support/microcontrollers/c2000/f/171/p/134600/487000

In addition, check your hardware connections along with the settings made on the software side such as baud rate and clock frequency which can also cause similar errors. These are general debugging steps for external mode failures.

Best Answer

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