Two flexcomm interfaces running has USARTs at the same time?

[carlosmedeiros]

Hello , I'm currently working with the LPC51U68  that has 8FLEXCOMM interfaces that can support USART.

Does anyone knows if I can have two FLEXCOMM interfaces has USARTS running at the same time, one for debugging the other for communicaitong with a cpu, from a board that i am working on. In the previous version of this board the developer used a USART to communicate with the cpu but it did not have a USART for debugging.

[kerryzhou]

Hi Carlos Medeiros,

      You can use multiple UART at the same time.

       Please check the user manual, this content:

So, actually, you can use 8 UARTs at the same time.

But , you said use one UART for debugging, what do you mean? Program the code to the chip or just used to printf some information? UART can't be used as the debugger.

So, maybe you can use it to printf some code run information, but you need to add the according code in your project.

Wish it helps you!

If you still have question about it,  please kindly let me know.

Have a great day,
Kerry

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[michalisantonio]

How to set up FLECOMM1 USART for private_profile_server project to send data over both flecomm0 and flecomm1 in QN9080DK?

I used pin configuration tools to get following in pin_mux.c  and also added  CLOCK_EnableClock(kCLOCK_Flexcomm1);     in clock_config.c but nothing works.

void BOARD_InitPins(void)
{

    SYSCON->PIO_FUNC_CFG[1] = ((SYSCON->PIO_FUNC_CFG[1] &
                                /* Mask bits to zero which are setting */
                                (~(SYSCON_PIO_FUNC_CFG_PA08_FUNC_MASK | SYSCON_PIO_FUNC_CFG_PA09_FUNC_MASK)))

                               /* PORTA PIN8 (coords: 46) is configured as FC1_TXD_SCL. */
                               | SYSCON_PIO_FUNC_CFG_PA08_FUNC(PIO_FUNC_ALT4)

                               /* PORTA PIN9 (coords: 45) is configured as FC1_RXD_SDA. */
                               | SYSCON_PIO_FUNC_CFG_PA09_FUNC(PIO_FUNC_ALT4));

    SYSCON->PIO_FUNC_CFG[2] = ((SYSCON->PIO_FUNC_CFG[2] &
                                /* Mask bits to zero which are setting */
                                (~(SYSCON_PIO_FUNC_CFG_PA16_FUNC_MASK | SYSCON_PIO_FUNC_CFG_PA17_FUNC_MASK)))

                               /* PORTA PIN16 (coords: 29) is configured as FC0_TXD. */
                               | SYSCON_PIO_FUNC_CFG_PA16_FUNC(PIO_FUNC_ALT4)

                               /* PORTA PIN17 (coords: 28) is configured as FC0_RXD. */
                               | SYSCON_PIO_FUNC_CFG_PA17_FUNC(PIO_FUNC_ALT4));

    SYSCON->PIO_PULL_CFG[0] = ((SYSCON->PIO_PULL_CFG[0] &
                                /* Mask bits to zero which are setting */
                                (~(SYSCON_PIO_PULL_CFG_PA08_PULL_MASK)))

                               /* Pull control register: Selects High-Z function. */
                               | SYSCON_PIO_PULL_CFG_PA08_PULL(PIO_MODE_HIGHZ));
}

[michalisantonio]

Hi, I use QN9080DK flecomm0 and flexcomm1. Flexomm0 connect to USART to RS485 converter but this converter has  RTS pin. How set RTS of converter to low at QN9080DK so i can receive data and high to send data?How can i use RTS or CTS of QN9080DK to control flow control as per page 29 of QN908x data sheet?

[kerryzhou]

Hi Michalis,

    Please create a new question post for yourself, then we will help you in your own post directly, don't follow your question in other's answered post.

Have a great day,
Kerry

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