sio.c

来自「ADS下的bios工程」· C语言 代码 · 共 82 行

#include <bios/s3c2410x.h>
#include <bios/time.h>
#include <bios/timer.h>

#undef DEBUG
#ifdef DEBUG
#define PRINTF(fmt, args...) printf("%s-%s()[%d]: " fmt, \
      __FILE__, __FUNCTION__, __LINE__, args)
#else
#define PRINTF(fmt, args...)
#endif

extern struct timer timers[NR_TIMERS] ;

int 
ser_printc(char ch)
{
    CSRB_WRITE(DEBUG_TX_BUFF_BASE, ch) ; 

    while (1) 
        if (CSR_READ(DEBUG_CHK_STAT_BASE) & DEBUG_TX_DONE_CHECK_BIT) 
            break ;

    if (ch == '\n') {
        CSRB_WRITE(DEBUG_TX_BUFF_BASE,'\r') ; 
        while (1) 
            if (CSR_READ(DEBUG_CHK_STAT_BASE) & DEBUG_TX_DONE_CHECK_BIT)
                break ;
    }

    return 0;
}

int 
ser_prints(char *buff, int nr)
{
    int    i;

    for (i = 0; i < nr; i ++) 
        ser_printc(buff[i]) ;

    return 0;
}

int  
ser_read(char *buf, int nr)
{
    int    i;

    for (i = 0;i < nr;i ++) {
        while (1) {
            if (CSR_READ(DEBUG_CHK_STAT_BASE) & DEBUG_RX_CHECK_BIT) {
                buf[i] = CSRB_READ(DEBUG_RX_BUFF_BASE) ; 
                return  1;
            } 
            else if ((volatile int)timers[0].to == 1) 
                return 0 ;
        }
    }

    return  1;
}

int ser_init(void)
{
    /* Initialize Uart Channel 0 */
    CSR_WRITE(UFCON0, DEBUG_UFCON_REG_VAL) ;
    CSR_WRITE(UMCON0, DEBUG_UMCON_REG_VAL) ;
    CSR_WRITE(ULCON0, DEBUG_ULCON_REG_VAL) ;
    CSR_WRITE(UCON0, DEBUG_UCONT_REG_VAL) ;
    CSR_WRITE(UBRDIV0, DEBUG_UBAUD_REG_VAL) ;

    /* Initialize Uart Channel 1 */
    CSR_WRITE(UFCON1, DEBUG_UFCON_REG_VAL) ;
    CSR_WRITE(UMCON1, DEBUG_UMCON_REG_VAL) ;
    CSR_WRITE(ULCON1, DEBUG_ULCON_REG_VAL) ;
    CSR_WRITE(UCON1, DEBUG_UCONT_REG_VAL) ;
    CSR_WRITE(UBRDIV1, DEBUG_UBAUD_REG_VAL) ;

    return 0 ;
}