iebus.c

本软件为tft型液晶显示器的驱动程序 可用于车载主机显示屏等

#include "define.h" 
#include "variable.h"

/*  write REG  */
#define IEBUSCTR         0x00

/*
   MSB=0 表示命令
   MSB=1 表示功能设置

*/
#define IEBUSCMR         0x01


/*
   本机地址
          当作为主机通信时：作为主机地址
          当作为从机通信时：作为从机地址
*/
#define IEBUSUAR1        0x02
#define IEBUSUAR2        0x03

/*
   远程地址：
           假如是作为主机通信，则其表示远程的从机地址	
           假如是作为从机通信，则其表示远程的主机地址
*/
#define IEBUSSAR1        0x04
#define IEBUSSAR2        0x05

#define IEBUSMCR         0x06
#define IEBUSTBF         0x0E

#define IEBUSSTREQ       0x01
#define IEBUSSRST        0x08
#define IEBUSREEN        0x10

/*  read REG   */
#define IEBUSSTR         0x00
#define IEBUSFLG         0x01

/* 作为主机接收数据的长度  */
#define IEBUSRDR1        0x02
/* 作为从机接收数据的长度  */
#define IEBUSRDR2        0x03

#define IEBUSLOR1        0x04
#define IEBUSLOR2        0x05
#define IEBUSDAR1        0x06
#define IEBUSDAR2        0x07
#define IEBUSRCR         0x08
#define IEBUSRBF         0x0E

#define IEBUSTFL         0x80
#define IEBUSTEP         0x40
#define IEBUSRFL         0x20
#define IEBUSREP         0x10

#define IEBUSMARQ        0x40
#define IEBUSSTRQ        0x20
#define IEBUSSLRE        0x10
#define IEBUSCEX         0x08
#define IEBUSRAW         0x04
#define IEBUSSTM         0x02
#define IEBUSIRQ         0x01

void IEBus_SendCmd(uchar address,uchar c)//write D72042 REG
{
   uchar i;
   address<<=4;//address
   IEBusCMD_High;//cmd
   NOP;
   for(i=0;i<8;i++)
     {
       IEBusCLK_Low;
       if(address&0x01)
           IEBusDAT_High;
       else
           IEBusDAT_Low;
       NOP;
       IEBusCLK_High;
       address>>=1;
       NOP;
      }
   IEBusCMD_Low;//DATA
   NOP;
   for(i=0;i<8;i++)
     {
        IEBusCLK_Low;
        if(c&0x01)
           IEBusDAT_High;
        else
           IEBusDAT_Low;
        NOP;
        IEBusCLK_High;
        c>>=1;
        NOP;
      }
   NOP;
   IEBusCMD_High;// CMD
}


void IEBus_Init(void)
{
   IEBus_SendCmd(0x00,0x18);
   Delay_ns(100);   
   IEBus_SendCmd(0x00,0x10);
   IEBus_SendCmd(0x02,0x04);//UAR1 本地地址 04 360
   IEBus_SendCmd(0x03,0x12);//UAR2   0x36
   IEBus_SendCmd(0x01,0x80);//0x81 设置功能，MSB=0表示命令
   IEBus_SendCmd(0x01,0x3B);
}  

uchar IEBus_ReadStatus(uchar address)//Read D72042 REG
{
   uchar i,c;
   c=0;
   address<<=4;
   address|=0x08;
   IEBusCMD_High;//cmd
   NOP;
   for(i=0;i<8;i++)
     {
       IEBusCLK_Low;
       if(address&0x01)
           IEBusDAT_High;
       else
           IEBusDAT_Low;     
	   NOP;
       IEBusCLK_High;
       address>>=1;
       NOP;
      }
   IEBusDATIn;//in
   IEBusCMD_Low;
   NOP;
   for(i=0;i<8;i++)
     {
        IEBusCLK_Low;
        c>>=1;
        NOP;
        IEBusCLK_High;
        NOP;
        if(IEBusDAT_Val)
           c|=0x80;
        else
           c&=0x7F;
      }
   IEBusCMD_Low;
   IEBusDATOut;
   NOP;
   return c;
}

//uchar RCR_Read(void)
//{
//   return IEBus_ReadStatus(IEBUSRCR);
//} 

/***********************
   send data function 
   n    send data length
   p[]  send data array 
        p[0] BroadCast
		p[1] high address 8bit
		p[2] low  address 4bit & control byte 4bit
		p[3] data length
		p[4] to p[n] data 
************************/
void IEBus_SendData(uchar TBuff[])//test ok
{
    uchar i; 
    uchar n;    
    IEBus_SendCmd(IEBUSSAR1,TBuff[2]+0x04);//set SAR1
    IEBus_SendCmd(IEBUSSAR2,TBuff[1]);//set SAR2
    IEBus_SendCmd(IEBUSMCR, TBuff[0]+0x2F);//set MCR(MSB=1)
    if(!(IEBus_ReadStatus(IEBUSSTR)&IEBUSTEP))// not empty
      {
        while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0;
        IEBus_SendCmd(IEBUSCMR,0x10);//clear TBuf
        while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0;
       }
    n=TBuff[3];
    IEBus_SendCmd(IEBUSTBF,TBuff[3]);//set data length
    for(i=0;i<n;i++)
      {
        if(IEBus_ReadStatus(IEBUSSTR)&IEBUSTFL)// TBuf is full?
           break;
        IEBus_SendCmd(IEBUSTBF,TBuff[i+4]);
       }
    IEBus_SendCmd(IEBUSCMR,0x08);//send TBuf
    while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0;
    
    IEBus_SendCmd(IEBUSCMR,0x2F);//clear RBuf
    while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0;
    NOP; 
    NOP;
    NOP;
    IEBus_SendCmd(0x00,0x10);  
    //ClrBit(StatusFlag,IEBusTxFlg);//when send ok clear IEBusTxFlg	
    IEBusTxFlagClr;
}  
/* 
  n         retrun the receive data length include address
  RBuff     receive data buff

  RBuff[0]  High Address 8bit
  RBuff[1]  Low  Address 4bit & Control byte 4bit
  RBuff[2]  Data Length
  RBuff[3]  Data[0]
  :::::::::::::::::
  RBuff[n]  Data[n]
*/
void IEBus_ReceiveData(uchar *n,uchar RBuff[])//reception data
{
    uchar i; 
    uchar length;
    length=IEBus_ReadStatus(IEBUSRDR2);//master receive data length;
    *n=length;    
    NOP;
    while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0; //0x01
    for(i=0;i<length;i++)
       {
         while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0; //0x01
         RBuff[i]=IEBus_ReadStatus(IEBUSRBF);
         NOP;
        }
    IEBus_SendCmd(IEBUSCMR,0x2F);//clear RBuf
    while(IEBus_ReadStatus(IEBUSFLG)&IEBUSCEX);//waiting until CEX=0;
    NOP;
    IEBus_SendCmd(0x00,0x10);
}    

void IEBusDataCheck(void)
{
   uchar c1,c2;  
   c1=IEBus_ReadStatus(0x00);
   c2=IEBus_ReadStatus(0x01);
   if(c2&0x04)
	IEBus_Init();
   if(!(c1&0x30))
      {            
        c2=IEBus_ReadStatus(0x08);
        c2&=0x0F;          
        if(c2==0x0A||c2==0x06)//broadcast && slave receive
          {
            IEBus_ReceiveData(&IEBus_RxDataLength,IEBus_RxBuf);	    
            IEBusRxFlagSet;//set IEBusFlag to flag receive ok
           }      
      }
}