CCS/TMS320F280049C: Can’t Receiver in SCI function with C2000 F28004x ControlCARD + Docking Station [R5.0]

Hello,

Thank you for your question! You are correct that the transmit function is working properly, as Terra Term is showing the output from the device. When you suspend the debug window (Run->Suspend in Code Composer Studio) what function is this code stuck in? Could you provide a screenshot of the Debug tab once the program is suspended? If it is stuck in the "SCI_readCharBlockingFIFO" function, then it may be that no data is reaching the device.

In order to debug this further, would you be able to connect a logic analyzer or oscilloscope to the TX and RX pins of the C2000 device to monitor the data coming in and out? This will allow us to quickly dismiss several potential issues.

Thank you!

Vince

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Dear Vince,

Thanks for your reply.

I set the break point in the “while” loop for For_LOOP in main routine to execute the program.

while (SCI_getRxFIFOStatus(base)== SCI_FIFO_RX0);

The strange thing is that the Tera Term cannot completely display the msg string "\ r \ n \ n \ nHello World !\0", as shown in the figure below.

Then click>> Y , click , then <F8>

The msg string is completely displayed now.

Then, I type a character, after active the Tera Term Windows.

The program stops in 1 of the following 3 programs.

If Step_Into <F5> is used, the program will circle around those 3 routines, and the characters input by the PC keyboard cannot be read.

May I know:

1. Why can't the msg string be output all at once?

2. How to change this program so that the characters input by the PC keyboard can be read normally.

Best Regard

Hung-Jin Chen

Hello,

I appreciate your follow up message and the details you provided! Answers below:

1. Why can't the msg string be output all at once?

A: When using the "step" functions of the debugger, a step forward can sometimes interrupt the SCI output and prevent the rest of the string from completing. In a normal run of the code (without breakpoints and without stepping through) all text will be displayed properly, as no debugger suspend requests are issued.

2. How to change this program so that the characters input by the PC keyboard can be read normally.

A: It looks like the device is stuck waiting for incoming communications to the device. Could you monitor the C2000-SCIRX line and see if data from the PC is reaching the C2000? It is possible that the RS232 and/or Terra Term is only able to receive, but not able to send data (could also be a setting in Terra Term).

Please provide oscilloscope or logic analyzer plots of the C2000-SCIRX line so we can potentially narrow down the issue to software/hardware! Thanks!

Regards,

Vince

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Dear Vince,

So far, I still can only output from the F280049 to the PC, and cannot read the characters sent by the PC via RS232; because I use an oscilloscope to monitor the SCIRxD (GPIO28), and there is no signal while I type a character in Tera Term utility.

However, would you please help is, can you actually connect the RS232 test once?

Thanks for your help!!!

Regards

Hung-Jin Chen