Uart

Barry Turner

Intellectual 610 points

Other Parts Discussed in Thread: TMS320C5505

I am using a TMS320C5505 EVM and developing code to talk to a device that is sending a constant stream of data

through a serial port. I used your Uart example 3 (interrupt driven) from the CSL as a base. I have the code working

with a hyper terminal. I do not get a receive character interrupt when I am connected to the device that is constantly

sending ascii data. I can see that the RTS and the CTS are flickering in a testplug we have. The Uart is initialized as

in the example (changed baud rate to 9600 and the PLL to 10000000). Do the control lines have any effect on the Uart

generating an interrupt when it receives a character?

Thanks

Barry

over 14 years ago

0 Hyun Kim over 14 years ago

TI__Genius 14965 points

Hi,

Are you talking about Hardware flow control?

Regards,

Hyun

0 Barry Turner over 14 years ago in reply to Hyun Kim

Intellectual 610 points

Hyun

I found a cable that had only 3 wires (transmit, receive, and ground) so there were no control signals being passed. There were

still no interrupts being generated by the Uart when receiving characters. I am not sure why I do not get interrupts because I get them

when I run the example from a hyperterminal. The only differences I know of is that there are a continuous stream of characters instead

of just one.

Regards,

Barry

0 Hyun Kim over 14 years ago in reply to Barry Turner

TI__Genius 14965 points

Hi,

Do you have a regular uart cable and seeing same problem?

Regards,

Hyun

0 Barry Turner over 14 years ago in reply to Hyun Kim

Intellectual 610 points

I still have the same problem.

Regards

Barry

0 Hyun Kim over 14 years ago in reply to Barry Turner

TI__Genius 14965 points

Then, It's software issue. Can you explain in detail what you are trying?

Regards

Hyun

0 Barry Turner over 14 years ago in reply to Hyun Kim

Intellectual 610 points

I am connected to a device that is sending a string of characters that are a series of commands. The length is maybe a couple of hundred bytes (It repeats once second).

I used your Uart example 3 and changed it to store data in a buffer. I am keeping track of where in the buffer I am. The initialization of the Uart is the same as

in example 3 except that I changed the baud rate to 9600. I run my application and I never get a received character interrupt even through there is a

constant string of characters being sent. If I connect to a hyper terminal and hit a character there is a receive character interrupt generated. If I connect my devide to a

hyper terminal I can see the constant stream of data being sent. I am using a TMS320C5505 EVM to develop this software.

Regards,

Barry

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