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Unable to bring up UART 1 on AM335x evm starter kit

Ajit S J
Prodigy 115 points

Hi,

I am using the starter ware for AM335x. I need to bring up  UART interfaces UART1 , UART2 , UART3 , UART4 and UART 5. I started with UART1.  I did the necessary initializations w.r.t to UART1. But I am unable to see anything on UART1.  I am trying to modify the uartEcho.c

Here are the initializations I had done

/*clk config */

UART1ModuleClkConfig(); 


/* Performing the Pin Multiplexing for UART0 instance. */

UARTPinMuxSetup(1); 


/* Performing a module reset. */
UARTModuleReset(SOC_UART_1_REGS);

/* Performing FIFO configurations. */

Uart1FIFOConfigure(); 

/* Performing Baud Rate settings. */

Uart1BaudRateSet(); 

/* Switching to Configuration Mode B. */
UARTRegConfigModeEnable(SOC_UART_1_REGS, UART_REG_CONFIG_MODE_B);

/* Programming the Line Characteristics. */
UARTLineCharacConfig(SOC_UART_1_REGS,
(UART_FRAME_WORD_LENGTH_8 | UART_FRAME_NUM_STB_1),
UART_PARITY_NONE);

UARTDivisorLatchDisable(SOC_UART_1_REGS); 

/* Disabling Break Control. */
UARTBreakCtl(SOC_UART_1_REGS, UART_BREAK_COND_DISABLE); //configured //

/* Switching to UART16x operating mode. */
UARTOperatingModeSelect(SOC_UART_1_REGS, UART16x_OPER_MODE);

/* Performing Interrupt configurations. */

Uart1InterruptEnable(); 

The UART1ModuleClkConfig() function has the below mentioned configurations

void UART1ModuleClkConfig(void)
{
HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) =
CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
CM_PER_L3S_CLKSTCTRL_CLKTRCTRL) != CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) =
CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
CM_PER_L3_CLKSTCTRL_CLKTRCTRL) != CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) =
CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) &
CM_PER_L3_INSTR_CLKCTRL_MODULEMODE) !=
CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE);

HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) =
CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) &
CM_PER_L3_CLKCTRL_MODULEMODE) != CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE);

HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) =
CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

while((HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL) !=
CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) =
CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) &
CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL) !=
CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKCTRL) =
CM_PER_L4LS_CLKCTRL_MODULEMODE_ENABLE;

while((HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKCTRL) &
CM_PER_L4LS_CLKCTRL_MODULEMODE) != CM_PER_L4LS_CLKCTRL_MODULEMODE_ENABLE);

while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
CM_PER_L3S_CLKSTCTRL_CLKACTIVITY_L3S_GCLK));

while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
CM_PER_L3_CLKSTCTRL_CLKACTIVITY_L3_GCLK));

while(!(HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
(CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L3_GCLK |
CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L4_GCLK)));


while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) &
(CM_PER_L4LS_CLKSTCTRL_CLKACTIVITY_L4LS_GCLK |
CM_PER_L4LS_CLKSTCTRL_CLKACTIVITY_UART_GFCLK)));

HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) &= ~CM_PER_UART1_CLKCTRL_MODULEMODE;

HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) |=
CM_PER_UART1_CLKCTRL_MODULEMODE_ENABLE;

while((HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) &
CM_PER_UART1_CLKCTRL_MODULEMODE) != CM_PER_UART1_CLKCTRL_MODULEMODE_ENABLE);

}

Please let me know whether the clock configurations are correct or not.

Also Please provide me the steps to configure all the UART interfaces

Thanks and regards 

Ajit S J

  • 0
    TI__Guru**** 393215 points

    Moving this to the Starterware forum.

  • 0
    Genius 5820 points

    There is a possibility to format code properly which makes more easy to read. I think nobody will dig through such unformatted code...

  • 0 in reply to qxc
    Prodigy 115 points

    Hi,

    I have detailed out the function UART1ModuleClkConfig ();

    I took the  McSPI0ModuleClkConfig() function from mcspi.c and changed the SPI related clock configurations to UART1 clock configurations. I did this as both SPI and UART1 work on the same clock domain.

     

    Regards

    Ajit

  • 0 in reply to Ajit S J
    Prodigy 115 points

    Hi,

    Please let me know the required clock configurations to bring up the UART1 interface. It is not similar to UART0 interface as UART0 uses the wake up configurations

    Also find the formatted code of the UART1ModuleClkConfig() function

    void UART1ModuleClkConfig(void)
    {

    HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) =
    CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
    CM_PER_L3S_CLKSTCTRL_CLKTRCTRL) != CM_PER_L3S_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

    HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) =
    CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
    CM_PER_L3_CLKSTCTRL_CLKTRCTRL) != CM_PER_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

    HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) =
    CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_INSTR_CLKCTRL) &
    CM_PER_L3_INSTR_CLKCTRL_MODULEMODE) !=
    CM_PER_L3_INSTR_CLKCTRL_MODULEMODE_ENABLE);

    HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) =
    CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKCTRL) &
    CM_PER_L3_CLKCTRL_MODULEMODE) != CM_PER_L3_CLKCTRL_MODULEMODE_ENABLE);

    HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) =
    CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
    CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL) !=
    CM_PER_OCPWP_L3_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

    HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) =
    CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL_SW_WKUP;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) &
    CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL) !=
    CM_PER_L4LS_CLKSTCTRL_CLKTRCTRL_SW_WKUP);

    HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKCTRL) =
    CM_PER_L4LS_CLKCTRL_MODULEMODE_ENABLE;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKCTRL) &
    CM_PER_L4LS_CLKCTRL_MODULEMODE) != CM_PER_L4LS_CLKCTRL_MODULEMODE_ENABLE);

    while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L3S_CLKSTCTRL) &
    CM_PER_L3S_CLKSTCTRL_CLKACTIVITY_L3S_GCLK));

    while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L3_CLKSTCTRL) &
    CM_PER_L3_CLKSTCTRL_CLKACTIVITY_L3_GCLK));

    while(!(HWREG(SOC_CM_PER_REGS + CM_PER_OCPWP_L3_CLKSTCTRL) &
    (CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L3_GCLK |
    CM_PER_OCPWP_L3_CLKSTCTRL_CLKACTIVITY_OCPWP_L4_GCLK)));


    while(!(HWREG(SOC_CM_PER_REGS + CM_PER_L4LS_CLKSTCTRL) &
    (CM_PER_L4LS_CLKSTCTRL_CLKACTIVITY_L4LS_GCLK |
    CM_PER_L4LS_CLKSTCTRL_CLKACTIVITY_UART_GFCLK)));

     HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) &=        ~CM_PER_UART1_CLKCTRL_MODULEMODE;

    HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) |=
        CM_PER_UART1_CLKCTRL_MODULEMODE_ENABLE;

    while((HWREG(SOC_CM_PER_REGS + CM_PER_UART1_CLKCTRL) &

        CM_PER_UART1_CLKCTRL_MODULEMODE) != CM_PER_UART1_CLKCTRL_MODULEMODE_ENABLE);

    }

    Regards

    Ajit 

  • 0 in reply to Ajit S J
    Genius 5820 points

    Again some unformatted code :-(

    Please refer to http://e2e.ti.com/support/embedded/starterware/f/790/t/214547.aspx , this seems to work.

  • 0 in reply to qxc
    Prodigy 70 points

    Hi,

      UART1 does not work, we have followed the steps mentioned in the above link. Any specific pointers will be helpful.

    Thanks,

    Ramprasad

  • 0 in reply to qxc
    Prodigy 115 points

    Hi Hans Muller,

    I have attached the formatted uart.c file which is from the path Starterware/platform/evmAM335x/

    Please let me know the required configurations for UART1 interface on EVM. 

    Regards

    Ajit

  • 0 in reply to Ajit S J
    Intellectual 770 points
    Hi Ajit,

    in fact that the UART4 has the same Clock domain as the UART1 can i use the same code?
    I did some corrections for the macros.

    In addtion i can watch the registers to be set. then i'm going to send any characters with this function:

    while(1)
    {

    UARTCharPutNonBlocking(SOC_UART_4_REGS, 15);

    }

    But i can't find any singals on the pins of the host connector.

    Kind reagrds, Hendrik