PROCESSOR-SDK-OMAPL138: PROCESSOR-SDK-OMAPL138

Seyed Mohamed1

Part Number: PROCESSOR-SDK-OMAPL138
Other Parts Discussed in Thread: OMAPL138

Hello,

I'm working on OMAPL138, In that, I'm facing the issue in UART1 while transmitting data I have checked with CRO voltage level getting fluctuated, Actually I have to receive the data from S1216F8 gi3 (skytraq GNSS) Instead of latitude, longitude data I'm receiving some garbage data.

I have checked with the level shifter also that time also I'm getting junk data and voltage level fluctuating instead of 3.3.v I'm receiving 2.5v.

My UART1 is working only I have checked with loopback mode.

Please help me out of this error. Below I have mentioned the UART1 configuration

void Uart1(void)
{
        PSCModuleControl(SOC_PSC_1_REGS, HW_PSC_UART1 , PSC_POWERDOMAIN_ALWAYS_ON,
        PSC_MDCTL_NEXT_ENABLE);

        /* Setup PINMUX */
        UARTPinMuxSetup(1, FALSE);

        UARTEnable(SOC_UART_1_REGS);

        /* 1 stopbit, 8-bit character, no parity */
        config = UART_WORDL_8BITS;

        /* Configuring the UART parameters*/
        UARTConfigSetExpClk(SOC_UART_1_REGS, SOC_UART_1_MODULE_FREQ, 115200,
                            config, UART_OVER_SAMP_RATE_16);

        /* Enabling the FIFO and flushing the Tx and Rx FIFOs.*/
        UARTFIFOEnable(SOC_UART_1_REGS);

        /* Setting the UART Receiver Trigger Level*/
        UARTFIFOLevelSet(SOC_UART_2_REGS, UART_RX_TRIG_LEVEL_1 );

}

Thanks in advance

Regards,

Seyed

over 3 years ago

0 Dillon Frank over 3 years ago

TI__Intellectual 2615 points

Hi Seyed,

Are you able to step through the code as it's executing? And when stepping through, what data values do you see right before the transmit occurs, and right after the receive occurs?

Regards,

Dillon

0 Seyed Mohamed1 over 3 years ago in reply to Dillon Frank

Intellectual 380 points

Hello Dillon,

Thanks for your response.
Yes, I can, when I'm executing the code I can't see any data from transmit side, because GNSS should transmit the data I have received the data from UART2 (serial console).
For UART0 whether it's working or not, I have transmitted the data "U" with the help of CRO (01010101) I have checked.
Previously I was used GY-GPS6MV2(GPS) I have configured the same UART0 for transmitting with a specific baud rate of 9600 that time I can receive the data from the serial console(UART2).
The same configuration I'm using for S1216F8 gi3 (skytraq GNSS) this module with a specific baud rate of 115200. But I'm receiving junk data.

0 Dillon Frank over 2 years ago in reply to Seyed Mohamed1

TI__Intellectual 2615 points

Is there a reason that you have to use a baud rate of 115200? I would suggest attempting a different baud rate to see if any of the data can be received correctly.

Also, there seems to be a similar thread on this topic, who were also running into issues with baud rates on UART1:

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/768050/rtos-tmdsidk437x-am4379-ti-rtos-uart1-activation

Additionally, do you have any other code where you initialize or use UART, that you could post to this thread?

Regards,

Dillon

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PROCESSOR-SDK-OMAPL138: PROCESSOR-SDK-OMAPL138