K10 UART3 Question

[keithkolmos]

I have a K10 144 pin, 100Mhz design and I'm running into problems getting UART3 up and running properly

I have the clock gated to PORTE

SIM_SCGC5|= SIM_SCGC5_PORTE_MASK;   // to get Port E Clock enabled

and I have the clock gated over to PORTE

SIM_SCGC4 |= SIM_SCGC4_UART3_MASK;  // to get clock to the UART

And I have selected alternate function 3 for the RX and TX pins

PORTE_PCR24 = PORT_PCR_MUX(3);

PORTE_PCR25 = PORT_PCR_MUX(3);

I'm enabling UART3's IRQ (status vector)

enable_irq(51);

and I have the ISR function loaded into vector 67 in the vector table

I have UART 3 setup like this (I'm looking for 9600 baud, N,8,1)

    UART3_C2=0x00;

  UART3_BDH=0x00;

    UART3_BDL=0x89;

    UART3_C1=0x00;

    UART3_S2=0x00;

    UART3_C3=0x00;

    UART3_C2=0x2C;    

Just to double check things I have the UART RX and TX lines jumpered together on the output connector of my board so I should (in theory) see the data back on the receive buffer every time I transmit

But I'm never seeing any data on the TX pin and obviously not seeing the Receive Pin IRQ for getting any data back.

What am I missing?

Thanks for the help

[Robin_Shen]

Hi, Keith Kolmos

You can generate a project according to the "Block reception/transmission, with interrupt service"  , the Typical Usage of Component Serial_LDD in CodeWarrior10.5 with PE.

Hope that help.

Best Regards

Binbin

[Paul_Tian]

Hi, Keith Kolmos

From your code, you do not send out any data from TX, so you cannot find waveform from TX line. For register setting in your code is correct.

I suggest you to have a look at Freescale sample project on www.freescale.com There are many UART function operation for your reference.

Hope my reply can help you.

Best Regards

Paul