K66 LPUART

j_cfernandez — Mon, 25 Jan 2016 09:39:12 GMT

I have a problem with the K66. When I connected the J_LINK debuger, the LPUART doesn`t work.

Re: K66 LPUART

Robin_Shen — Tue, 26 Jan 2016 07:27:39 GMT

Hello j_cfernandez

Are you using the LPUART0 at PTA0~PTA3? These pins are default as JTAG function.

If so, why not use other LPUART0 pins, for example:PTE8~PTE11 or PTD8~PTD11.

Best Regards

Robin

Re: K66 LPUART

j_cfernandez — Wed, 27 Jan 2016 09:35:52 GMT

Dear,

I use the PTE8~PTE11 mit LPUART.

Did someone has a simple Init Example?

Regards

Re: K66 LPUART

Robin_Shen — Fri, 29 Jan 2016 06:21:36 GMT

You can refer the demo when download the KSDK of FRDM-K66F:

Kinetis SDK v2 & v1.3 (REV 2.0) New

Software Development Kit for Kinetis MCUs, Online SDK Builder

HTML
Kinetis SDK v2 & v1.3
1/28/2016

Download

Best Regard

Robin

Re: K66 LPUART

j_cfernandez — Mon, 01 Feb 2016 17:16:56 GMT

Dear,

the LPUART0 doesn't work. StatusFlags indicate sended, but there is no Datastream on the Pins

Regards.

My ini:

[...]

PORTD->PCR[8] = (0x00000500); /* RX5 */

PORTD->PCR[9] = (0x00000500); /* TX5 */

[...]

SIM->SCGC2 &= ~(SIM_SCGC2_LPUART0_MASK); /* Disable the clock to the selected UART */

SIM->SOPT2 |= SIM_SOPT2_LPUARTSRC(3); /* Selected clock Source */
SIM->SCGC2 |= SIM_SCGC2_LPUART0_MASK; /* Enable the clock to the selected UART */

/* Make sure that the transmitter and receiver are disabled while we change settings */
LPUART0->CTRL &= ~(LPUART_CTRL_TE_MASK | LPUART_CTRL_RE_MASK );

    baudDiff = baud;
    osr = 0;
    sbr = 0;

    for (osrTemp = 4; osrTemp <= 32; osrTemp++)
    {
        /* calculate the temporary sbr value   */
        sbrTemp = (sysclk / ( baud * osrTemp));
        /*set sbrTemp to 1 if the sourceClockInHz can not satisfy the desired baud rate*/
        if (sbrTemp == 0)
        {
            sbrTemp = 1;
        }
        /* Calculate the baud rate based on the temporary OSR and SBR values */
        calculatedBaud = (sysclk / (osrTemp * sbrTemp));

tempDiff = calculatedBaud - baud;

        /* Select the better value between srb and (sbr + 1) */
        if (tempDiff > (baud - (sysclk / (osrTemp * (sbrTemp + 1)))))
        {
            tempDiff = baud - (sysclk / (osrTemp * (sbrTemp + 1)));
            sbrTemp++;
        }

        if (tempDiff <= baudDiff)
        {
            baudDiff = tempDiff;
            osr = osrTemp; /* update and store the best OSR value calculated */
            sbr = sbrTemp; /* update store the best SBR value calculated */
        }
    }

    /* Check to see if actual baud rate is within 3% of desired baud rate
     * based on the best calculate OSR value */
    if (baudDiff < ((baud / 100) * 3))
    {
        temp = LPUART0->BAUD;

        /* Acceptable baud rate, check if OSR is between 4x and 7x oversampling.
         * If so, then "BOTHEDGE" sampling must be turned on */
        if ((osr > 3) && (osr < 8))
        {
            temp |= LPUART_BAUD_BOTHEDGE_MASK;
        }

        /* program the osr value (bit value is one less than actual value) */
        temp &= ~LPUART_BAUD_OSR_MASK;
        temp |= LPUART_BAUD_OSR(osr - 1);

        /* write the sbr value to the BAUD registers */
        temp &= ~LPUART_BAUD_SBR_MASK;
        LPUART0->BAUD = temp | LPUART_BAUD_SBR(sbr);
    }

    /* Set bit count and parity mode. */
    LPUART0->BAUD &= ~LPUART_BAUD_M10_MASK;
    temp = LPUART0->CTRL;
temp &= ~(LPUART_CTRL_PE_MASK | LPUART_CTRL_PT_MASK | LPUART_CTRL_M_MASK);

temp &= ~(LPUART_CTRL_M_MASK|LPUART_CTRL_PE_MASK);

LPUART0->CTRL = temp;

    /* set stop bit per char */
    temp = LPUART0->BAUD & ~LPUART_BAUD_SBNS_MASK;
    LPUART0->BAUD = temp;

/* Clear all status flags */
temp = (LPUART_STAT_LBKDIF_MASK | LPUART_STAT_RXEDGIF_MASK | LPUART_STAT_OR_MASK | LPUART_STAT_NF_MASK |LPUART_STAT_FE_MASK | LPUART_STAT_PF_MASK);

    LPUART0->STAT |= temp;

    temp = LPUART0->CTRL;
    temp |= LPUART_CTRL_TE_MASK;
    temp |= LPUART_CTRL_RE_MASK;
    LPUART0->CTRL = temp;
}

Re: K66 LPUART

Robin_Shen — Wed, 03 Feb 2016 06:38:39 GMT

If you are using the FRDM-K66F evaluation board, you can download the Kinetis SDK v2 & v1.3 (REV 2.0).

Then select and download the "SDK_2.0_FRDM-K66F" .

You can find the LPUART driver_examples after installed it, such as in "E:\SDK_2.0_FRDM-K66F\boards\frdmk66f\driver_examples\lpuart".

These driver_examples using the PTE8 and PTE9 as the LPUART0 pins.(See the BOARD_InitPins function)

You can have a test first and then change these Pins.

Robin

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