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eyang1
Visitor II
June 7, 2008
Question

UART problem on MCB-STR9 Eval board

  • June 7, 2008
  • 2 replies
  • 685 views
Posted on June 07, 2008 at 11:22

UART problem on MCB-STR9 Eval board

    This topic has been closed for replies.

    2 replies

    E
    eyang1Author
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:53

    Hi,

    Now I am using the sample code as listed bellow to test the UART port on the MCB-STR9 Eval board V2.0.

    It doesn't work at all.

    Do anyone know why?

    Thanks

    eyang

    //////////

    #include

    void com_baudrate (unsigned int baudrate)

    {

    unsigned long BRDi = 0, BRDf = 0;

    unsigned long long UARTClk = 48000000;

    if ((SCU->CLKCNTR & SCU_BRCLK_Div2) != SCU_BRCLK_Div2) {

    UARTClk /= 2; /* set UART Clock acc. BRSEL */

    }

    /* baudrate calculation */

    BRDi = ((100 * UARTClk) / (16 * baudrate)); /* calculate the integer part */

    BRDf = BRDi - (100 * (BRDi / 100)); /* calculate the fractal part */

    UART0->CR &= 0xFFFE; /* disable UART */

    UART0->IBRD = BRDi / 100; /* set the integer part */

    UART0->FBRD = ((((BRDf * 64) + 50) / 100)); /* set the fractal part */

    UART0->LCR &= 0xFFFF; /* to accept baudrate */

    UART0->CR |= 0x0001; /* enable UART */

    }

    void init_serial (void) { /* Initialize Serial Interface */

    /* UART0 Setup.....................................................*/

    SCU->GPIOOUT[3] = 0x0008; /* P3.1 output UART0 TX */

    SCU->GPIOIN[3] = 0x01; /* P3.0 input UART0 RX */

    UART0->LCR = UART_WordLength_8D /* 8 bits */

    | UART_Parity_No /* no Parity */

    | UART_HardwareFlowControl_None /* no flow control */

    & UART_StopBits_1 /* 1 Stop bit */

    & UART_FIFO_Disable; /* FIFO disabled */

    UART0->CR = UART_Mode_Rx /* Receive Enable */

    | UART_Mode_Tx /* Transmit Enable */

    | 0x0001; /* UART Enable */

    com_baudrate (115200); /* 115200 Baud */

    }

    /* implementation of putchar (also used by printf function to output data) */

    int sendchar (int ch) { /* Write character to Serial Port */

    if (ch == '\n') {

    while ((UART0->FR & 0x0020)); /* TX Fifo Full */

    UART0->DR = 0x0D; /* output CR */

    }

    while ((UART0->FR & 0x0020));

    return (UART0->DR = ch);

    }

    N
    nivelin
    Visitor II
    May 17, 2011
    Posted on May 17, 2011 at 09:53

    There is hardware bug in MCB-STR9 V2.0. – UART0 / COM1 could not be used.

    Take a look here:

    http://keil.com/support/docs/3211.htm

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