Quark C1000:How to enable UART0 and UART1 both?

Version 1

    I enable UART0 and UART1 both,but only UART0 rx can't be use.

    Please help thanks~




    void test_stdout_uart_setup(qm_uart_t UART,uint32_t baud_divisors)



    if (UART == QM_UART_0)

      qm_pmux_select(QM_PIN_ID_19, QM_PMUX_FN_0);

    else if(UART == QM_UART_1)

      qm_pmux_select(QM_PIN_ID_16, QM_PMUX_FN_2);



    if (UART1_FTDI)

      QM_AON_GPIO->gpio_swporta_dr |= BIT(3);


      QM_AON_GPIO->gpio_swporta_dr &= ~BIT(3);


      QM_AON_GPIO->gpio_swporta_ddr |= BIT(3);


      uartcfg.baud_divisor = baud_divisors;

      uartcfg.line_control = QM_UART_LC_8N1;


    if (UART == QM_UART_0)

      clk_periph_enable(CLK_PERIPH_CLK | CLK_PERIPH_UARTA_REGISTER);

    else if(UART == QM_UART_1)

      clk_periph_enable(CLK_PERIPH_CLK | CLK_PERIPH_UARTB_REGISTER);


      qm_uart_set_config(UART, &uartcfg);




    int main(void)


    uint8_t value;


    qm_pmux_select(QM_PIN_ID_18, QM_PMUX_FN_0);

    qm_pmux_select(QM_PIN_ID_19, QM_PMUX_FN_0);

    qm_pmux_input_en(QM_PIN_ID_18, true);

    qm_pmux_select(QM_PIN_ID_16, QM_PMUX_FN_2);

    qm_pmux_select(QM_PIN_ID_17, QM_PMUX_FN_2);

    qm_pmux_input_en(QM_PIN_ID_17, true);


    test_stdout_uart_setup(QM_UART_1, SYSCLK_4MHZ_TO_UART_9600BPS);

    test_stdout_uart_setup(QM_UART_0, SYSCLK_4MHZ_TO_UART_9600BPS);




              clk_sys_udelay(500*1000);//0.5 sec

              qm_uart_read_non_block(QM_UART_0, &value);





    Sorry about the delay getting back to you on this.


    As mentioned in  Section 2.3.2 of the C1000 Platform User Guide the UART0 signals on the Evaluation Kit Board are reserved for the BLE -  http://www.intel.com/content/dam/www/public/us/en/documents/guides/quark-c1000-development-platform-user-guide.pdf


    If you have a look a the board schematic - http://www.intel.com/content/dam/www/public/us/en/documents/schematic/quark-c1000-development-platform-schematic.pdf  - you will see that removing Resister 239 from the board will stop the interference you are seeing on the UART0 RX signal from the BLE TX.


    One that resistor is removed you can use the below code to verify you have UART0 RX signal - the code sets up both UARTs and echos characters entered in UART1 out to UART0 and vice versa.


    #include "qm_pinmux.h"

    #include "qm_uart.h"

    #include "qm_interrupt.h"

    #include "qm_isr.h"

    #include "clk.h"


    int main(void)


      static qm_uart_status_t uart0_status __attribute__((unused)) = 0;

      static qm_uart_status_t uart1_status __attribute__((unused)) = 0;



      QM_PRINTF("Starting UART.\r\n");



      qm_uart_config_t uart0_cfg ;

      qm_uart_config_t uart1_cfg ;



      uint8_t uart0_message[] =

         "This is UART_0. Characters typed here will appear on UART_1.\r\n";

      uint8_t uart1_message[] =

         "This is UART_1. Characters typed here will appear on UART_0.\r\n";

      uint8_t data;



      qm_pmux_select(QM_PIN_ID_19, QM_PMUX_FN_0);  /*UART0 TXD*/

      qm_pmux_select(QM_PIN_ID_18, QM_PMUX_FN_0);  /*UART0 RXD */

      qm_pmux_select(QM_PIN_ID_41, QM_PMUX_FN_1);  /*UART0 RTS*/

      qm_pmux_select(QM_PIN_ID_40, QM_PMUX_FN_1);  /*UART0 CTS*/

      qm_pmux_input_en(QM_PIN_ID_18, true);

      qm_pmux_input_en(QM_PIN_ID_41, true);



      qm_pmux_select(QM_PIN_ID_16, QM_PMUX_FN_2);  /*UART1 TXD*/

      qm_pmux_select(QM_PIN_ID_17, QM_PMUX_FN_2);  /*UART1 RXD*/

      qm_pmux_select(QM_PIN_ID_9, QM_PMUX_FN_2);   /*UART1 RTS*/

      qm_pmux_select(QM_PIN_ID_8, QM_PMUX_FN_2);   /*UART1 CTS*/

      qm_pmux_input_en(QM_PIN_ID_17, true);

      qm_pmux_input_en(QM_PIN_ID_9, true);



      /* Configures UART_0 for 115200 bps */

      /*uart0_cfg.baud_divisor = QM_UART_CFG_BAUD_DL_PACK(0, 208, 5); */

      uart0_cfg.baud_divisor = QM_UART_CFG_BAUD_DL_PACK(0, 17, 6);

      uart0_cfg.line_control = QM_UART_LC_8N1;

      uart0_cfg.hw_fc = false;



      /* Configures UART_0 for 115200 bps */

    /* uart1_cfg.baud_divisor = QM_UART_CFG_BAUD_DL_PACK(0, 208, 5); */

        uart1_cfg.baud_divisor = QM_UART_CFG_BAUD_DL_PACK(0, 17, 6);

      uart1_cfg.line_control = QM_UART_LC_8N1;

      uart1_cfg.hw_fc = false;



      qm_uart_set_config(QM_UART_0, &uart0_cfg);

      qm_uart_set_config(QM_UART_1, &uart1_cfg);



      /* enable clock for UART_0 */

      clk_periph_enable(CLK_PERIPH_CLK | CLK_PERIPH_UARTA_REGISTER);

      /* enable clock for UART_1 */

      clk_periph_enable(CLK_PERIPH_CLK | CLK_PERIPH_UARTB_REGISTER);



      /* this message will only be printed on the default UART */

      QM_PRINTF("Welcome to Intel Quark SE C1000 UART configuration demo.\r\n");



      qm_uart_write_buffer(QM_UART_0, uart0_message, sizeof(uart0_message));

      qm_uart_write_buffer(QM_UART_1, uart1_message, sizeof(uart1_message));



      while(1) {

      /* checks if received data is available on UART_0 */

      qm_uart_get_status(QM_UART_0, &uart0_status);

      if (uart0_status && QM_UART_RX_BUSY){

      qm_uart_read_non_block(QM_UART_0, &data);

      qm_uart_write(QM_UART_1, data);




      /* checks if received data is available on UART_1 */

      qm_uart_get_status(QM_UART_1, &uart1_status);

      if (uart1_status && QM_UART_RX_BUSY){

      qm_uart_read_non_block(QM_UART_1, &data);

      qm_uart_write(QM_UART_0, data);





      return 0;






    Hi MichelleC_Intel,


    Thanks for your help.




    此文件是從下列討論區產生: Quark C1000:How to enable UART0 and UART1 both?