cfg.c

常用外围接口的程序设计

/*
*********************************************************************************************************
*                                  Embedded Systems Building Blocks
*                               Complete and Ready-to-Use Modules in C
*
*                                           Configuration File
*
*                            (c) Copyright 1999, Jean J. Labrosse, Weston, FL
*                                           All Rights Reserved
*
* Filename   : CFG.C
* Programmer : Jean J. Labrosse
*********************************************************************************************************
*/

#include "includes.h"

static  INT16S  AITestCnts;

/*$PAGE*/
/*
*********************************************************************************************************
*                                              KEYBOARD
*                                         INITIALIZE I/O PORTS
*********************************************************************************************************
*/

#if  MODULE_KEY_MN
void  KeyInitPort (void)
{
    outp(KEY_PORT_CW, 0x82);                    /* Initialize 82C55A: A=OUT, B=IN (COLS), C=OUT (ROWS) */
}

/*
*********************************************************************************************************
*                                              KEYBOARD
*                                            SELECT A ROW
*
* Description : This function is called to select a row on the keyboard.
* Arguments   : 'row'  is the row number (0..7) or KEY_ALL_ROWS
* Returns     : none
* Note        : The row is selected by writing a LOW.
*********************************************************************************************************
*/

void  KeySelRow (INT8U row)
{
    if (row == KEY_ALL_ROWS) {
        outp(KEY_PORT_ROW, 0x00);                /* Force all rows LOW                                 */
    } else {
        outp(KEY_PORT_ROW, ~(1 << row));         /* Force desired row LOW                              */
    }
}

/*
*********************************************************************************************************
*                                              KEYBOARD
*                                            READ COLUMNS
*
* Description : This function is called to read the column port.
* Arguments   : none
* Returns     : the complement of the column port thus, ones are keys pressed
*********************************************************************************************************
*/

INT8U  KeyGetCol (void)
{
    return (~inp(KEY_PORT_COL));                 /* Complement columns (ones indicate key is pressed)  */
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                        MULTIPLEXED LED DISPLAY
*                                        I/O PORTS INITIALIZATION
*
* Description: This is called by DispInit() to initialize the output ports used in the LED multiplexing.
* Arguments  : none
* Returns    : none
* Notes      : 74HC573  8 bit latches are used for both the segments and digits outputs.
*********************************************************************************************************
*/

#if  MODULE_LED
void  DispInitPort (void)
{
    outp(DISP_PORT_SEG, 0x00);              /* Turn OFF segments                                       */
    outp(DISP_PORT_DIG, 0x00);              /* Turn OFF digits                                         */
}

/*
*********************************************************************************************************
*                                       MULTIPLEXED LED DISPLAY
*                                           SEGMENTS output
*
* Description: This function outputs seven-segment patterns.
* Arguments  : seg    is the seven-segment patterns to output
* Returns    : none
*********************************************************************************************************
*/

void  DispOutSeg (INT8U seg)
{
    outp(DISP_PORT_SEG, seg);
}

/*
*********************************************************************************************************
*                                        MULTIPLEXED LED DISPLAY
*                                             DIGIT output
*
* Description: This function outputs the digit selector.
* Arguments  : msk    is the mask used to select the current digit.
* Returns    : none
*********************************************************************************************************
*/

void  DispOutDig (INT8U msk)
{
    outp(DISP_PORT_DIG, msk);
}
#endif

/*$PAGE*/
/*
*********************************************************************************************************
*                                           LCD DISPLAY MODULE
*                                   INITIALIZE DISPLAY DRIVER I/O PORTS
*
* Description : This initializes the I/O ports used by the display driver.
* Arguments   : none
* Returns     : none
*********************************************************************************************************
*/

#if  MODULE_LCD
void  DispInitPort (void)
{
    outp(DISP_PORT_CMD, 0x82);         /* Set to Mode 0: A are output, B are inputs, C are outputs     */
}

/*
*********************************************************************************************************
*                                           LCD DISPLAY MODULE
*                                       WRITE DATA TO DISPLAY DEVICE
*
* Description : This function sends a single BYTE to the display device.
* Arguments   : 'data'  is the BYTE to send to the display device
* Returns     : none
* Notes       : You will need to adjust the value of DISP_DLY_CNTS (LCD.H) to produce a delay between
*               writes of at least 40 uS.  The display I used for the test actually required a delay of
*               80 uS!  If characters seem to appear randomly on the screen, you might want to increase
*               the value of DISP_DLY_CNTS.
*********************************************************************************************************
*/
void  DispDataWr (INT8U data)
{
    INT8U  dly;


    outp(DISP_PORT_DATA, data);                  /* Write data to display module                       */
    outp(DISP_PORT_CMD,  0x01);                  /* Set E   line HIGH                                  */
    DispDummy();                                 /* Delay about 1 uS                                   */
    outp(DISP_PORT_CMD,  0x00);                  /* Set E   line LOW                                   */
    for (dly = DISP_DLY_CNTS; dly > 0; dly--) {  /* Delay for at least 40 uS                           */
        DispDummy();
    }
}

/*
*********************************************************************************************************
*                                          LCD DISPLAY MODULE
*                                    SELECT COMMAND OR DATA REGISTER
*
* Description : This function read a BYTE from the display device.
* Arguments   : none
*********************************************************************************************************
*/
void  DispSel (INT8U sel)
{
    if (sel == DISP_SEL_CMD_REG) {
        outp(DISP_PORT_CMD, 0x02);     /* Select the command register (RS low)                         */
    } else {
        outp(DISP_PORT_CMD, 0x03);     /* Select the data    register (RS high)                        */
    }
}
#endif