UART problem on MCB-STR9 Eval board

[eyang1]

Posted on June 07, 2008 at 11:22

UART problem on MCB-STR9 Eval board

[eyang1]

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);

}

[nivelin]

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