comm_51.c

串口通信构件

/*
*********************************************************************************************************
*                                     Embedded Systems Building Blocks
*                                  Complete and Ready-to-Use Modules in C
*********************************************************************************************************
*/

/*
*********************************************************************************************************
*                                               INCLUDES
*********************************************************************************************************
*/

#include "..\includes\INCLUDES.H"
extern bit SemTIbusy;
/*
*********************************************************************************************************
*                                               CONSTANTS
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*                                         LOCAL GLOBAL VARIABLES
*********************************************************************************************************
*/

#if OS_CRITICAL_METHOD == 3                                /* Allocate storage for CPU status register */
    extern OS_CPU_SR  cpu_sr;
#endif
/*
*********************************************************************************************************
*                                           COMM ISR HANDLER
*串行口通信中断程序
* Description : This function processes an interrupt from a COMM port.  The function verifies whether the
*               interrupt comes from a received character, the completion of a transmitted character or
*               both.
* Notes       : 'switch' statements are used for expansion.
*********************************************************************************************************
*/


/*
*********************************************************************************************************
*                                         DISABLE TX INTERRUPTS
*
* Description : This function disables the character transmission.

*********************************************************************************************************
*/
/*
*********************************************************************************************************
*                                          ENABLE TX INTERRUPTS
*
* Description : This function enables transmission of characters.  Transmission of characters is
*               interrupt driven.  If you are using a multi-drop driver, the code must enable the driver
*               for transmission.

*********************************************************************************************************
*/

void  CommTxIntEn ()
{
    //OS_ENTER_CRITICAL();
    TI = 1;                /* Enable IRQ */
    SemTIbusy = 1;
    //OS_EXIT_CRITICAL();
}