Freescale MCF52211 UART演示程序

mayer | 2009-06-15 18:33:05 阅读：1367

P&E的BDM仿真器买回来了，在我的MCF52211板子上很正常，看来华恒的那个开源BDM有问题，那个BDM我不知道是什么原因，就是没办法调试MCF52211，也不知道是TBLCF本身不支持MCF52211，还是华恒没有把这个东西做好。

下面贴个调试通过的MCF52211 UART的demo程序，供参考

#include "support_common.h" /* include peripheral declarations and more */
#if (CONSOLE_IO_SUPPORT || ENABLE_UART_SUPPORT)
/* Standard IO is only possible if Console or UART support is enabled. */
#include <stdio.h>
#endif

void uart0_init(unsigned long baudrate)
{
    register uint16 div;

    MCF_GPIO_PUAPAR =0x05;
/*
* Reset Transmitter
*/
MCF_UART0_UCR =MCF_UART_UCR_RESET_TX;

/*
* Reset Receiver
*/
MCF_UART0_UCR = MCF_UART_UCR_RESET_RX;

/*
* Reset Mode Register
*/
MCF_UART0_UCR = MCF_UART_UCR_RESET_MR;

/*
* No parity, 8bit data
*/
MCF_UART0_UMR1=(0
| MCF_UART_UMR_PM_NONE
| MCF_UART_UMR_BC_8 );

/*
* 1bit stop
*/
MCF_UART0_UMR2=(0
| MCF_UART_UMR_CM_NORMAL
| MCF_UART_UMR_SB_STOP_BITS_1);

/*
* Set Rx and Tx baud by SYSTEM CLOCK
*/
MCF_UART0_UCSR = (0
| MCF_UART_UCSR_RCS_SYS_CLK
| MCF_UART_UCSR_TCS_SYS_CLK);

/*
* Mask all UART interrupts
*/
MCF_UART0_UIMR = 0;
/* set baud rate
*/
div=(uint16)(60000000L/(32*baudrate));

MCF_UART0_UBG1=(unsigned char)(div>>8);
MCF_UART0_UBG2=(unsigned char)(div&0x00ff);

/* Enable Tx/Rx*/
MCF_UART0_UCR = (0
| MCF_UART_UCR_TX_ENABLED
| MCF_UART_UCR_RX_ENABLED);
}

void uart0_putchar(unsigned char c)
{
/* Wait until space is available in the FIFO */
    while (!(MCF_UART0_USR & MCF_UART_USR_TXRDY))
    {

    };

/* Send the character */
MCF_UART0_UTB = c;
}

unsigned char uart0_getchar()
{
/* Wait until character has been received */
    while (!(MCF_UART0_USR & MCF_UART_USR_RXRDY))
    {

    };

return MCF_UART0_URB;
}

void uart0_putstr(unsigned char *str)
{
while(*str!=0)
{
uart0_putchar(*str++);
}
}

int main(void)
{
int counter = 0;
unsigned char c="0";

#if (CONSOLE_IO_SUPPORT || ENABLE_UART_SUPPORT)
printf("Hello World in C from MCF52211 derivative on MCF52211 board\n\r");
fflush(stdout);
#endif
uart0_init(9600);
uart0_putstr((unsigned char*)("MCF52211 Uart0 test start\n"));

for(;;) {
  c=uart0_getchar();
  uart0_putchar(c);
    counter++;
}
}

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