simple_serial.c

此程序为查询方式下的tl16c750程序.开发环境为uClinux2.4.x+s3c440b.不需要向uClinux内核中加入驱动

/********************************************************************
*
*   File Name: 
*   ---------
*   test_tl16c750.c  
*
*
*   Author:
*   -------
*   zhang dahai
*
*   Email:
*   ------
*   [e-mail]
*
*   QQ & MSN;
*   ---------
*   334654529, [e-mail]
*
*   Modification History:
*   -----------------
*   2006-7-19, zhang dahai, created(09-04 13:30).
*
********************************************************************/

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <termios.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>

#include "simple_serial.h"

/*44b0 sfr base address*/

#define     REGBASE     0x01c00000

/*Memory Controller Registers*/

#define     BWSCON      *(volatile unsigned int *)(REGBASE+0x080000)

/*I/O Ports Registers */

#define     PCONA       *(volatile unsigned int *)(REGBASE+0x120000)
#define     PDATA       *(volatile unsigned int *)(REGBASE+0x120004)
#define     PCONB       *(volatile unsigned int *)(REGBASE+0x120008)
#define     PDATB       *(volatile unsigned int *)(REGBASE+0x12000c)
#define     PCONC       *(volatile unsigned int *)(REGBASE+0x120010)
#define     PDATC       *(volatile unsigned int *)(REGBASE+0x120014)
#define     PUPC        *(volatile unsigned int *)(REGBASE+0x120018)
#define     PCOND       *(volatile unsigned int *)(REGBASE+0x12001c)
#define     PDATD       *(volatile unsigned int *)(REGBASE+0x120020)
#define     PUPD        *(volatile unsigned int *)(REGBASE+0x120024)
#define     PCONE       *(volatile unsigned int *)(REGBASE+0x120028)
#define     PDATE       *(volatile unsigned int *)(REGBASE+0x12002c)
#define     PUPE        *(volatile unsigned int *)(REGBASE+0x120030)
#define     PCONF       *(volatile unsigned int *)(REGBASE+0x120034)
#define     PDATF       *(volatile unsigned int *)(REGBASE+0x120038)
#define     PUPF        *(volatile unsigned int *)(REGBASE+0x12003c)
#define     PCONG       *(volatile unsigned int *)(REGBASE+0x120040)
#define     PDATG       *(volatile unsigned int *)(REGBASE+0x120044)
#define     PUPG        *(volatile unsigned int *)(REGBASE+0x120048)
#define     SPUCR       *(volatile unsigned int *)(REGBASE+0x12004c)
#define     EXTINT      *(volatile unsigned int *)(REGBASE+0x120050)
#define     EXTINPND    *(volatile unsigned int *)(REGBASE+0x120054)

/*Interrupt Controller Registers */

#define     INTCON      *(volatile unsigned int *)(REGBASE+0x200000)
#define     INTPND      *(volatile unsigned int *)(REGBASE+0x200004)
#define     INTMOD      *(volatile unsigned int *)(REGBASE+0x200008)
#define     INTMSK      *(volatile unsigned int *)(REGBASE+0x20000c)
#define     I_PSLV      *(volatile unsigned int *)(REGBASE+0x200010)
#define     I_PMST      *(volatile unsigned int *)(REGBASE+0x200014)
#define     I_CSLV      *(volatile unsigned int *)(REGBASE+0x200018)
#define     I_CMST      *(volatile unsigned int *)(REGBASE+0x20001c)
#define     I_ISPR      *(volatile unsigned int *)(REGBASE+0x200020)
#define     I_ISPC      *(volatile unsigned int *)(REGBASE+0x200024)
#define     F_ISPR      *(volatile unsigned int *)(REGBASE+0x200038)
#define     F_ISPC      *(volatile unsigned int *)(REGBASE+0x20003c)


#define BUFSIZE 100

static void config_bwscon_and_port_and_extint (void)
{
        long  temp;

    /*bus width config for fpga and tl16c750*/

    temp = BWSCON ;
    
    BWSCON = ( temp & ( ~0xFF00 ) ) | 0x4400 ;  /*nGCS3: TL16C750. 8bit mode*/
                                        	/*nGCS2: FPGA. 8bit mode*/

    /* Configuration Port Control Register*/
                									
    /* Port A */
                									
    PCONA = 0x3FF;

    /* Port B */
    
    PCONB = 0x7FF;

    /* Port C */

    PCONC = 0XFF000000;

    /* Port D */
    
    PCOND = 0x5000;
    PDATD = 0xC0;

    /* Port E */
    
    PCONE = 0x00000028;

    /* Port F */
    
    PCONF = 0x00124b2a;

    /* Port G */
    
    PCONG = 0x00000030; /*  PG2--INT750--EINT2*/

    /*INTMSK*/
    
    temp = INTMSK ;
    INTMSK = temp | 0x800064;   /*open UTXD1,URXD1,EXTINT2,I2C*/

    /* Configure TL16C750 interupt*/
    
    temp = EXTINT;
    EXTINT = ( temp & ( ~0x700 ) ) | 0x100 ;
}

/*============================================
Description:    we need to configure LCR,BAUD RATE,MCR,FCR,IER for 
            tl16c750.
=============================================*/
static void config_tl16c750(void)
{
    /*line control registe=0000 1011*/
    /*8 bits, 1 stop bit, odd*/
    
    TL16C750_LCR = LCR_8_CHR_BIT | LCR_1_STOP_BIT ; // | LCR_EN_PARITY ;


    /*Baud Rate*/
    /*DLAB=1*/
    
    TL16C750_LCR = TL16C750_LCR | LCR_DLAB ;

    /*divisor = XIN frequency input  ÷(desired baud rate ×16)*/
    
    TL16C750_DLSB = ( XTALL / ( DESIRED_BAUD_RATE * 16 ) ) & 0x00FF ;	
    TL16C750_DMSB = ( XTALL / ( DESIRED_BAUD_RATE * 16 ) ) >> 8 ;	


    /*Modem Control Register=0010 0010*/
    /* Auto-RTS and auto-CTS enabled*/

    //TL16C750_MCR = MCR_EN_AUTO_FLOW;	


    /*FIFO Interrupt Control Register=0100 0001*/
    /*64bytes mode, trigger level=56, enable the transmit and receive FIFOs*/

    TL16C750_LCR = TL16C750_LCR & ( ~LCR_DLAB)  ;   /*DLAB=0*/
    //TL16C750_FCR = FCR_64_BYTE_MODE |FCR_56_TRIGGER_LEVEL_64 |FCR_FIFO_ENALBE;
    TL16C750_FCR = 0 ;
    

    /*Interrupt Enable Register=0000 0101*/
    /*DLAB=0*/
    
    TL16C750_LCR = TL16C750_LCR & ( ~LCR_DLAB)  ;	

    /*enable received data available interrupt,  and receiver line status interrupt; disable THRE interrupt*/
    
    TL16C750_IER = IER_EN_RDA_INT | IER_EN_RLS_INT ;
    
}

             
int main(void)
{
    unsigned char       temp;	
        unsigned char   buf[BUFSIZE];
    
    PDATD = 0xc0;

    printf("start to test the driver for tl16c750.\n\n");

        printf("configure arm......");
       
    config_bwscon_and_port_and_extint();
    
    printf("done\n\n");

    
    printf("configure TL16C750......");
    
    config_tl16c750();

    printf("done\n\n");

    PDATD = 0x00;
    
    while( 1)
    {	
        //PDATD = 0x80;

        temp = TL16C750_LSR ;

        printf("LSR = 0x%x\n", temp);

        if( ( temp & LSR_DATA_READY ) == 1 )
    	{
            printf("receiving char......");
    		
            temp = TL16C750_FIFO ;

            printf("done!\n");

            printf("the char is 0x%x\n",temp);
    		
            printf("sending back the char to host......");
    		
            TL16C750_FIFO = temp ;

            while( ( TL16C750_LSR & LSR_THRE ) == 0) ;

            printf("done!\n");
    	}
    }
    
        return 0;
}