bsp_vfd.c

嵌入式的tcpip协议栈

#include <includes.h>

/*
*********************************************************************************************************
*                                      DISPLAY CONTROL LINE FUNCTIONS
*********************************************************************************************************
*/
#define  GPIO1_LCD_DB0                        DEF_BIT_00
#define  GPIO1_LCD_DB1                        DEF_BIT_01
#define  GPIO1_LCD_DB2                        DEF_BIT_02
#define  GPIO1_LCD_DB3                        DEF_BIT_03
#define  GPIO1_LCD_DB4                        DEF_BIT_04
#define  GPIO1_LCD_DB5                        DEF_BIT_05
#define  GPIO1_LCD_DB6                        DEF_BIT_06
#define  GPIO1_LCD_DB7                        DEF_BIT_07
#define  GPIO1_LCD_RS                         DEF_BIT_08
#define  GPIO1_LCD_W                          DEF_BIT_09
#define  GPIO1_LCD_RD                         DEF_BIT_10  



/******************************************************************************
** Function name:		DispDly_uS (CPU_INT08U data)
**
** Descriptions:		Non blocking delay.
**
** parameters:			delay in microseconds
** Returned value:		None
** 
******************************************************************************/
void  DispDly_uS (CPU_INT32U us)
{
    CPU_INT32U  us_per_tick;
    CPU_INT32U  ticks;


    us_per_tick = 1000000L / OS_TICKS_PER_SEC;
    ticks       = us / us_per_tick + 1;
    OSTimeDly(ticks);
}
/******************************************************************************
** Function name:		DispX_High/Low ()
**
** Descriptions:		
** parameters:			none
** Returned value:		None
** 
******************************************************************************/
static  void  DispW_High (void)
{
    FIO2SET = GPIO1_LCD_W;                                  	/* Raise the LCD /W pin                                    */
}
static  void  DispRD_High (void)
{
    FIO2SET = GPIO1_LCD_RD;                                  	/* Raise the LCD RD pin                                    */
}

static  void  DispW_Low (void)
{
    FIO2CLR = GPIO1_LCD_W;                               	/* Lower the LCD /W pin                                    */
}

static  void  DispRD_Low (void)
{
    FIO2CLR = GPIO1_LCD_RD;                               	/* Lower the LCD RD pin                                    */
}

/******************************************************************************
** Function name:		DispDataWr (CPU_INT08U data)
**
** Descriptions:		The function reads the BUSY VFD pin, if it's set,
**                              it will wait 100 us and the write the byte to the 
**                              VFD. In case of using more complex commands like 
**                              scrolling, graphic mode then the 100us is NOT ENOUGH.
**                              for the VFD.
**
** parameters:			Byte to write to the VFD.
** Returned value:		None
** 
******************************************************************************/
void  DispDataWr (CPU_INT08U data)
{
    CPU_INT32U  value;
    DispRD_Low();                                              /*Initiates the Read Mode*/
    FIO2DIR &= ~GPIO1_LCD_DB7;
    //while(FIO2PIN & GPIO1_LCD_DB7){       
    if(FIO2PIN & GPIO1_LCD_DB7){                               /* Check the BUSY pin*/
      DispDly_uS(100);          
    }
    //}
    DispRD_High();                                             /*Finishes the Read Mode*/
    FIO2DIR |= GPIO1_LCD_DB7;
    DispW_Low();                                               /* Initiates the Write Mode*/


    value  =  (data & 0xFF);                                   /*Write the byte through the parallel port*/
    FIO2SET = value;
    value  = (~data & 0xFF);
    FIO2CLR = value;
  
    DispDly_uS(100);                                          
    DispW_High();                                              /*Finishes the Write Mode*/
    FIO2DIR &= ~GPIO1_LCD_DB7;
    // DispDly_uS(100);
}

/******************************************************************************
** Function name:		VFD_Init
**
** Descriptions:		Initialize display
**
** parameters:			void
** Returned value:		None
** 
******************************************************************************/
void VFD_Init(void)
{

   CPU_INT32U  value;

    value      =  (3 << 16) | (3 << 18) | (3 << 20);     	/* Create a mask for the LCD Control function bits          */
    PINSEL4   &=  ~value;                                    	/* Clear and configure the associated function bits as GPIO */

    value      =  (3 << 0) | (3 << 2) | (3 << 4) | (3 << 6) | (3 << 8) | (3 << 10) | (3 << 12) | (3 << 14);/* Create a mask for the LCD Data function bits             */
    PINSEL4   &=  ~value;                                     	/* Clear and configure the associated function bits as GPIO */

    value      =   GPIO1_LCD_DB0 | GPIO1_LCD_DB1 | GPIO1_LCD_DB2 | GPIO1_LCD_DB3 | GPIO1_LCD_DB4 | GPIO1_LCD_DB5 | GPIO1_LCD_DB6 | GPIO1_LCD_DB7 |GPIO1_LCD_RS | GPIO1_LCD_W | GPIO1_LCD_RD;
    FIO2DIR |= 0x7FF;                                          /* Configure all of the LCD pins as outputs                 */
    FIO2CLR =0x7FF;
 
    DispW_High();                                           	/* Initialize the state of the LCD RW bit to High           */
    DispRD_High();                                           	/* Initialize the state of the LCD RW bit to High           */
}