serialucos.c

ucos操作系统在skyeye模拟器上的原文件

#include "includes.h"
#include "serialucos.h"
#include "at91_init.h"

extern void CommRxIntEn(INT8U ch);
extern void CommRxIntDis(INT8U ch);

typedef struct {
    INT16U     RingBufRxCtr;                /* Number of characters in the Rx ring buffer              */
    OS_EVENT  *RingBufRxSem;                /* Pointer to Rx semaphore                                 */
    INT8U     *RingBufRxInPtr;              /* Pointer to where next character will be inserted        */
    INT8U     *RingBufRxOutPtr;             /* Pointer from where next character will be extracted */
    INT8U      RingBufRx[COMM_RX_BUF_SIZE]; /* Ring buffer character storage (Rx)                 */
  } COMM_RING_BUF;


COMM_RING_BUF  UART0Buf;
//COMM_RING_BUF  UART1Buf;


/*$PAGE*/
/*
*********************************************************************************************************
*                                    REMOVE CHARACTER FROM RING BUFFER
*
*
* Description : This function is called by your application to obtain a character from the communications
*               channel.  The function will wait for a character to be received on the serial channel or
*               until the function times out.
* Arguments   : 'ch'    is the COMM port channel number and can either be:
*                           UART0
*                           UART1
*               'time_out'    is the amount of time (in clock ticks) that the calling function is willing to
*                       wait for a character to arrive.  If you specify a timeout of 0, the function will
*                       wait forever for a character to arrive.
*               'err'   is a pointer to where an error code will be placed:
*                           *err is set to COMM_NO_ERR     if a character has been received
*                           *err is set to COMM_RX_TIMEOUT if a timeout occurred
*                           *err is set to COMM_BAD_CH     if you specify an invalid channel number
* Returns     : The character in the buffer (or NULL if a timeout occurred)
*********************************************************************************************************
*/
INT8U  CommGetChar (INT8U ch, INT16U time_out, INT8U *err)
{
    INT8U          c;
    INT8U          oserr;
    COMM_RING_BUF *pbuf;
    
    switch (ch) {                                          /* Obtain pointer to communications channel */
        case UART0:
             pbuf = &UART0Buf;
    	     break;

    //    case UART1:
    //         pbuf = &UART1Buf;
    //         break;

        default:
             *err = COMM_BAD_CH;
             return (NUL);
    }
    OSSemPend(pbuf->RingBufRxSem, time_out, &oserr);             /* Wait for character to arrive             */
    if (oserr == OS_TIMEOUT) {                             /* See if characters received within timeout*/
        *err = COMM_RX_TIMEOUT;                            /* No, return error code                    */
   	return (NUL);
    } else {
        OS_ENTER_CRITICAL();
        pbuf->RingBufRxCtr--;                              /* Yes, decrement character count           */
        c = *pbuf->RingBufRxOutPtr++;                      /* Get character from buffer                */
        if (pbuf->RingBufRxOutPtr == &pbuf->RingBufRx[COMM_RX_BUF_SIZE]) {     /* Wrap OUT pointer     */
            pbuf->RingBufRxOutPtr = &pbuf->RingBufRx[0];
        }
        OS_EXIT_CRITICAL();
        *err = COMM_NO_ERR;

        return (c);
    }
}


/*
*********************************************************************************************************
*                                  INITIALIZE COMMUNICATIONS MODULE
*
*
* Description : This function is called by your application to initialize the communications module.  You
*               must call this function before calling any other functions.
* Arguments   : none
*********************************************************************************************************
*/

void  CommInit (void)
{
    COMM_RING_BUF *pbuf;


    pbuf                  = &UART0Buf;                     /* Initialize the ring buffer for COMM1     */
    pbuf->RingBufRxCtr    = 0;
    pbuf->RingBufRxInPtr  = &pbuf->RingBufRx[0];
    pbuf->RingBufRxOutPtr = &pbuf->RingBufRx[0];
    pbuf->RingBufRxSem    = OSSemCreate(0);
 
/*
    pbuf                  = &UART1Buf;                    
    pbuf->RingBufRxCtr    = 0;
    pbuf->RingBufRxInPtr  = &pbuf->RingBufRx[0];
    pbuf->RingBufRxOutPtr = &pbuf->RingBufRx[0];
    pbuf->RingBufRxSem    = OSSemCreate(0);
*/
}


/*
*********************************************************************************************************
*                                   SEE IF RX CHARACTER BUFFER IS EMPTY
*
*
* Description : This function is called by your application to see if any character is available from the
*               communications channel.  If at least one character is available, the function returns
*               FALSE otherwise, the function returns TRUE.
* Arguments   : 'ch'    is the COMM port channel number and can either be:
*                           UART0
*                           UART1
* Returns     : TRUE    if the buffer IS empty.
*                   FALSE   if the buffer IS NOT empty or you have specified an incorrect channel.
*********************************************************************************************************
*/

BOOLEAN  CommIsEmpty (INT8U ch)
{
    BOOLEAN        empty;
    COMM_RING_BUF *pbuf;


    switch (ch) {                                          /* Obtain pointer to communications channel */
        case UART0:
             pbuf = &UART0Buf;
             break;

    //    case UART1:
    //         pbuf = &UART1Buf;
    //         break;

        default:
             return (TRUE);
    }
    OS_ENTER_CRITICAL();
    if (pbuf->RingBufRxCtr > 0) {                          /* See if buffer is empty                   */
        empty = FALSE;                                     /* Buffer is NOT empty                      */
    } else {
        empty = TRUE;                                      /* Buffer is empty                          */
    }
    OS_EXIT_CRITICAL();
    return (empty);
}


/*
*********************************************************************************************************
*                                    INSERT CHARACTER INTO RING BUFFER
*
*
* Description : This function is called by the Rx ISR to insert a character into the receive ring buffer.
* Arguments   : 'ch'    is the COMM port channel number and can either be:
*                           UART0
*                           UART1
*               'c'     is the character to insert into the ring buffer.  If the buffer is full, the
*                       character will not be inserted, it will be lost.
*********************************************************************************************************
*/

void  CommPutRxChar (INT8U ch, INT8U c)
{
    COMM_RING_BUF *pbuf;


    switch (ch) {                                          /* Obtain pointer to communications channel */
        case UART0:
             pbuf = &UART0Buf;
             break;

   //     case UART1:
   //          pbuf = &UART1Buf;
   //          break;

        default:
             return;
    }
    if (pbuf->RingBufRxCtr < COMM_RX_BUF_SIZE) {           /* See if buffer is full                    */
        pbuf->RingBufRxCtr++;                              /* No, increment character count            */
        *pbuf->RingBufRxInPtr++ = c;                       /* Put character into buffer                */
        if (pbuf->RingBufRxInPtr == &pbuf->RingBufRx[COMM_RX_BUF_SIZE]) { /* Wrap IN pointer           */
            pbuf->RingBufRxInPtr = &pbuf->RingBufRx[0];
        }
        OSSemPost(pbuf->RingBufRxSem);                     /* Indicate that character was received     */
    }
}