TL16C752B串口芯片数据发送

只看该作者 · 2013-7-19 15:30

小弟最近在折腾TI的一款串口芯片，现在能够实现数据的接受，而发送却一直出现问题，一直发送D5（无论我想叫它发送什么），下面是我的程序大家帮忙看一下：
// Project Stationery  //
//////////////////////////////
#include <stdio.h>
#define hong short

#define    BSC_UARTB             0x01
#define    BUAD_9K6_L             0x90          //22.1184M changed by asky
#define    BUAD_9K6_H             0x00
#define    UARTINT_RHR          0x01       /*set rcv int*/
#define    UARTINT_THR          0x02            /*set send int*/
#define    BSC_UARTA_ADDR       0xfa000080
#define    BSC_UARTB_ADDR       0xfa000000
#define    TX_ENABLE             0x08
#define    RX_ENABLE             0x0B

enum
{
      UART_RHR_THR = 0x00,                  /* 0 */
      UART_IER = 0x02,                      /* 1 */
      UART_FCR_IIR = 0x04,                   /* 2 */
      UART_LCR = 0x06,                      /* 3 */
      UART_MCR = 0x08,                      /* 4 */
      UART_LSR = 0x0a,                      /* 5 */
      UART_MSR = 0x0c,                      /* 6 */
      UART_SPR = 0x0e                            /* 7 */
};
enum
{
UART_DLL = 0x00,
UART_DLH = 0x02,
UART_EFR = 0x04,
UART_NULL = 0x06,
UART_XON1 = 0x08,
UART_XON2 = 0x0a,
UART_XOFF1_TCR = 0x0c,
UART_XOFF2_TLR_FIFORDY = 0x0e
};

asm void system_call();

asm void system_call()
{
nofralloc
sc
blr
}

unsigned char BSC_TL16C752B_WRITE_REG(unsigned char channal,unsigned char reg,unsigned char val);//int val->char val
unsigned char BSC_TL16C752B_READ_REG(unsigned char channal,unsigned char reg);
void TL16C752B_init ();
void TL16C752B_putc (unsigned char c);//int - char
char TL16C752B_getc ();
int    TL16C752B_tstc ();

////////////////////////////////////////////////////////////
// tl16c752b init    //
////////////////////////////////////////////////////////////
void TL16C752B_init()
{
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_IER, 0x00);
//baud set
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_LCR, 0x80); //divisor_enable 8bit_data  1bit_stop
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_DLL, BUAD_9K6_L); //baud 9600
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_DLH, BUAD_9K6_H);
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_LCR, 0x03); //divisor_disable 8bit_data  1bit_stop

BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_FCR_IIR, 0x07); //ADD BY ASKY
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_MCR, 0x00);
}
void TL16C752B_putc (unsigned char c) //int -> char
{
      while (( BSC_TL16C752B_READ_REG(BSC_UARTB, UART_LSR) & 0x20) == 0);
BSC_TL16C752B_WRITE_REG(BSC_UARTB, UART_RHR_THR, c); //add by asky
}

char TL16C752B_getc ()
{
      while ((BSC_TL16C752B_READ_REG(BSC_UARTB, UART_LSR) & 0x01) == 0) {
      }
      return (BSC_TL16C752B_READ_REG(BSC_UARTB, UART_RHR_THR)); //add by asky
}

int TL16C752B_tstc ()
{
      return ((BSC_TL16C752B_READ_REG(BSC_UARTB, UART_LSR) & 0x01) != 0);
}

unsigned char BSC_TL16C752B_WRITE_REG(unsigned char channal,unsigned char reg,unsigned char val)//int val -> char val
{
      volatile unsigned char *temp;
      temp = 0;                                                             //add by asky
      if(channal == 0)
      {
            temp = (volatile unsigned char*)(BSC_UARTA_ADDR + reg );
      }
      else if(channal == 1)
      {
            temp = (volatile unsigned char*)(BSC_UARTB_ADDR + reg );
      }
      *temp = val;
      return 0;
}

unsigned char BSC_TL16C752B_READ_REG(unsigned char channal,unsigned char reg)
{
      unsigned char value = 0;
      volatile unsigned char *temp;
      temp = 0;
      if(channal == 0)
      {
            temp = (volatile unsigned char*)(BSC_UARTA_ADDR + reg );
      }
      else if(channal == 1)
      {
            temp = (volatile unsigned char*)(BSC_UARTB_ADDR + reg );
      }
      value = *temp;
      return value;
}

void Delay(unsigned int i)
{
int j,k;
for(j=0;j<i;j++)
for(k=0;k<i;k++);
}

void main()
{
printf("Welcome to CodeWarrior!\r\n");
TL16C752B_init();
while(1)
{
m = TL16C752B_getc();
Delay(1000);
TL16C752B_putc(m);
}
}

串口芯片管脚测试过了没有问题，波特率设置没有问题，还可能是什么原因呢？