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SCI receive interrupt not triggered

karthick ph
Prodigy 190 points


Hi,

I'm using TMS320F28335 micro and Code Composer Studio V3.3 for the project development. 

I need to generate SCI Receive interrupt whenever characters received through UART.

So, I have done the required SCI Receive interrupt configuration in my source code.(Please refer attached Application_Sci.c file)

Multiplexed GPIO11 is used for the SCI Receive operation.2781.SCI_Rx.zip

Settings for the interrupt enable is done in main.c file.

But, Interrupt is not triggered? However, the configuration settings looks correct.

Anyone come across such problem?.

Regards,

Karthick

  • 0
    TI__Mastermind 22025 points

    Hi Karthick,

    I took a look at your sources.  It does appear that you have the PIE setup correctly to generate SCI RX interrupts, but I think you might have included the wrong file in your zip.  All I see are application_isr.c and main.c.  I can't find any SCI init code (which must be where the problem lies).  Could you post your init code for me to look over?


    Trey

  • 0 in reply to Trey German289
    Prodigy 190 points

    Hi Trey,

    Thanks for the immediate reply.

    oops. I forgot to attach the sci configuration file.

    Now I have attached the Application_sci.c which includes the sci settings.7558.SCI_Rx.zip

    Regards,

    Karthick PH

  • 0 in reply to karthick ph
    TI__Mastermind 22025 points

    Karthick,

    I took a look and your SCI initialization looks good.  I'm beginning to think this isn't a problem with interrupts, but possibly with baud rate.  When you send characters to the device, are you able to see them in the receive buffer?  Inversely, if you transmit a character does the bit time match up with what you think it should be (9600 Baud = 104uS)?  If you aren't seeing anything in the recieve buffer and your transmit bit time isn't 104uS, then you have a problem with your baud rate configuration.

    Trey

  • 0 in reply to Trey German289
    Prodigy 190 points

    Hi Trey,

    Thanks for the valuable suggestion.

    I have resolved the issue.  The problem is I have configured the GPIO11 pin for PWM6 module in the InitEPwm6Gpio() function.

    Also I have used the same GPIO11 pin for the SCIRXDB (SCI receive in B channel) interrupt. 

    In main.c file I have called InitSci() function prior to InitEPwm6Gpio() function.  Such that, PWM6 have been configured.

    So, after this I configured GPIO11 only for SCI receive; then interrupt got triggered.

    Once again, I appreciate your suggestions on this.

    Thanks

    Karthick PH