com_uart0.c

这个是基于ARM7的相关驱动代码

/*
*******************************************************************************
*                    Copyright (c) 2005, Comba Telecom System
*                             All Rights Reserved
*
* Purpose           : uart0 File
* File Name         : uart0.c

* Chip type         : LPC22XX(ARM7TDMI)
* IDE               : ADS1.2

* Revision history  :
    01a,2005/08/29,Lu jiangmin  -- Creation(written),re. zlgmcu Chen mingji
  
* Description       :
    
*******************************************************************************
*/

#define IN_UART0
#include "config.h"

static int UART0SendBuf[(UART0_SEND_QUEUE_LENGTH + sizeof(int) - 1) / sizeof(int)];
static OS_EVENT *Uart0Sem;

INT8U Uart0WriteFull(DataQueue *Buf, QUEUE_DATA_TYPE Data, INT8U Mod)
{
    INT16U temp;
    
    Mod = Mod;
    
    temp = QueueSize((void *)Buf);
    while (temp <= QueueNData((void *)Buf))         /* 等待数据队列不满 */
    {
        OSTimeDly(1);
    }
    return QueueWrite((void *)Buf, Data);           /* 数据重新入队 */
}

INT8U UART0Init(INT32U bps)
{
    INT16U Fdiv;
    
    PINSEL0 = (PINSEL0 & 0xfffffff0) | 0x05;    /* 选择管脚为UART0 */

    U0LCR = 0x80;                               /* 允许访问分频因子寄存器 */
    Fdiv = (Fpclk / 16) / bps;                  /* 设置波特率 */
    U0DLM = Fdiv / 256;							
	U0DLL = Fdiv % 256;						
    U0LCR = 0x03;                               /* 禁止访问分频因子寄存器 */
                                                /* 且设置为8,1,n */
	U0IER = 0x05;                               /* 允许接收和发送中断 */
    U0FCR = 0xc7;                               /* 初始化FIFO */
    if (QueueCreate((void *)UART0SendBuf,
                     sizeof(UART0SendBuf),
                     NULL,
                     (INT8U (*)())Uart0WriteFull)
                     == NOT_OK)
    {
        return FALSE;
    }
    Uart0Sem = OSSemCreate(0);
    if (Uart0Sem != NULL)
    {
        return TRUE;
    }
    else
    {
        return FALSE;
    }

} 

void UART0Putch(INT8U Data)
{
    INT8U temp;
    
    QueueWrite((void *)UART0SendBuf, Data);         /* 数据入队 */
    OS_ENTER_CRITICAL();
    if ((U0LSR & 0x00000020) != 0)
    {                                               /* UART0发送保持寄存器空 */
        QueueRead(&temp, UART0SendBuf);             /* 发送最初入队的数据 */
        U0THR = temp;
        U0IER = U0IER | 0x02;                       /* 允许发送中断 */
    }
    OS_EXIT_CRITICAL();
} 

void UART0Write(char *Data, INT16U NByte)
{
    m485_rxToTx;
    
    OS_ENTER_CRITICAL();
    
    while (NByte-- > 0)
    {
        UART0Putch(*Data++);
    }
    
    OS_EXIT_CRITICAL();
    
    while (!(U0LSR & 0x40));
    m485_txToRx;
} 

void UART0Printf(char *data)
{
    UART0Write(data, strlen(data));	
}
	
INT8U UART0Getch(INT16U timeout, INT8U *flag)
{
    INT8U err;

    OS_ENTER_CRITICAL();
    while ((U0LSR & 0x00000001) == 0)
    {                                           /* 没有收到数据 */
        U0IER = U0IER | 0x01;                   /* 允许接收中断 */
        OSSemPend(Uart0Sem, timeout, &err);           /* 等待接收数据 */
        if (err != OS_NO_ERR)
        {
            *flag = err;
            OS_EXIT_CRITICAL();
            return 0x00;
        }
    }
    err = U0RBR;                                /* 读取收到的数据 */
    OS_EXIT_CRITICAL();
    return err;
} 

void UART0_Exception(void)
{
    INT8U IIR, temp, i;

	OS_ENTER_CRITICAL();
    VICIntEnClr = (1 << 6) | (1 << 4);
    VICVectAddr = 0;            // 通知中断控制器中断结束
    OS_EXIT_CRITICAL();

    while(((IIR = U0IIR) & 0x01) == 0)
    {                                                   /* 有中断未处理完 */
        switch (IIR & 0x0e)
        {
            case 0x02:                                  /* THRE中断    */
                for (i = 0; i < UART0_FIFO_LENGTH; i++) /* 向发送FIFO填充数据 */
                {
                    if (QueueRead(&temp, UART0SendBuf) == QUEUE_OK)
                    {
                        U0THR = temp;
                    }
                    else
                    {
                        U0IER = U0IER & (~0x02);        /* 队列空，则禁止发送中断 */
                    }
                }
                break;
            case 0x04:                                  /* 接收数据可用 */
                OSSemPost(Uart0Sem);                    /* 通知接收任务 */
                U0IER = U0IER & (~0x01);                /* 禁止接收及字符超时中断 */
                break;
            case 0x06:                                  /* 接收线状态   */
                temp = U0LSR;
                break;
            case 0x0c:                                  /* 字符超时指示 */
                OSSemPost(Uart0Sem);                    /* 通知接收任务 */
                U0IER = U0IER & (~0x01);                /* 禁止接收及字符超时中断 */
                break;
            default :
                break;
        }
    } 
    VICIntEnable = (1 << 6) | (1 << 4);
}