LPC54016JET100 USART3 OUTPUT PROBLEM

afzhang — Thu, 05 Dec 2019 02:18:59 GMT

In our circuit diagram, PIN0_2 and PIN0_3 are used as serial ports. PIN0_2 and PIN0_3 are configured as USART3.But can not output messages.What should I pay attention to when configuring as usart3.Thanks.

Re: LPC54016JET100 USART3 OUTPUT PROBLEM

xiangjun_rong — Mon, 09 Dec 2019 05:59:43 GMT

Hi,

I think you can refer to the following code to configure the pin as uart3:

#define IOCON_PIO_DIGITAL_EN 0x0100u /*!<@brief Enables digital function */
#define IOCON_PIO_FUNC1 0x01u         /*!<@brief Selects pin function 1 */
#define IOCON_PIO_INPFILT_OFF 0x0200u /*!<@brief Input filter disabled */
#define IOCON_PIO_INV_DI 0x00u        /*!<@brief Input function is not inverted */
#define IOCON_PIO_MODE_INACT 0x00u    /*!<@brief No addition pin function */
#define IOCON_PIO_MODE_PULLUP 0x20u   /*!<@brief Selects pull-up function */
#define IOCON_PIO_OPENDRAIN_DI 0x00u /*!<@brief Open drain is disabled */
#define IOCON_PIO_SLEW_STANDARD 0x00u /*!<@brief Standard mode, output slew rate control is enabled */

void uart3PinAssignment(void)
{
   uint32_t pin_config;
    //PINs Configuration for Master
      CLOCK_EnableClock(kCLOCK_Iocon);
      CLOCK_EnableClock(kCLOCK_Gpio0);
   // P0_2/FC3_TXD,
    pin_config = (/* Pin is configured as FC3_TXD */
                                         IOCON_PIO_FUNC1 |
                                         /* Selects pull-up function */
                                         IOCON_PIO_MODE_PULLUP |
                                         /* Input function is not inverted */
                                         IOCON_PIO_INV_DI |
                                         /* Enables digital function */
                                         IOCON_PIO_DIGITAL_EN |
                                         /* Input filter disabled */
                                         IOCON_PIO_INPFILT_OFF |
                                         /* Standard mode, output slew rate control is enabled */
                                         IOCON_PIO_SLEW_STANDARD |
                                         /* Open drain is disabled */
                                         IOCON_PIO_OPENDRAIN_DI);

IOCON_PinMuxSet(IOCON, 0, 2, pin_config);

    // P0_3/FC3_RXD,
    pin_config = (/* Pin is configured as FC3_RXD */
                                           IOCON_PIO_FUNC1 |
                                           /* Selects pull-up function */
                                           IOCON_PIO_MODE_PULLUP |
                                           /* Input function is not inverted */
                                           IOCON_PIO_INV_DI |
                                           /* Enables digital function */
                                           IOCON_PIO_DIGITAL_EN |
                                           /* Input filter disabled */
                                           IOCON_PIO_INPFILT_OFF |
                                           /* Standard mode, output slew rate control is enabled */
                                           IOCON_PIO_SLEW_STANDARD |
                                           /* Open drain is disabled */
                                           IOCON_PIO_OPENDRAIN_DI);

     IOCON_PinMuxSet(IOCON, 0, 3, pin_config);

   //Reset FC3
   SYSCON->PRESETCTRL[1]|=1<<14;
   SYSCON->PRESETCTRL[1]&=~(1<<14);
   //set gated clock of FC3
   SYSCON->AHBCLKCTRL[1]|=1<<14;
   //set the FC3 as spi
   FLEXCOMM3->PSELID=0x01;
   //set uart3 clock divider
   //select 12MHz FRO_12M
   SYSCON->FCLKSEL[3]=0x00;

}

Hope it can help you

XiangJun Rong

Re: LPC54016JET100 USART3 OUTPUT PROBLEM

afzhang — Mon, 09 Dec 2019 06:11:14 GMT

Hi XiangJun Rong:

Thanks!

Aifei Zhang

发件人: xiangjun.rong

发送时间: 2019年12月9日 14:01

收件人: Aifei Zhang

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Re: LPC54016JET100 USART3 OUTPUT PROBLEM

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