AT91RM9200读取ADS7843触摸屏源代码

 AT91RM9200读取ADS7843触摸屏源代码(gliet
//--------------------------------------------------------------
typedef struct __xTouch_value
{
    uint16 x;
    uint16 y;
}_xTouch_value;
typedef struct __xTouch
{
    boolean IRQ_Mod;
    boolean down;
    boolean up;
_xTouch_value
     value;
}_xTouch;
//--------------------------------------------------------------
_xTouch xxTouch = { true,false,false,{0xffff,0xffff} };
_xTouch *xTouch = &xxTouch;
//--------------------------------------------------------------
//触摸屏
#define Touch_DCLK    (uint32)(0x01<<11)/*PC11*/
#define Touch_CS    (uint32)(0x01<<12)/*PC12*/
#define Touch_DIN    (uint32)(0x01<<13)/*PC13*/
#define Touch_busy    (uint32)(0x01<<14)/*PC14*/
#define Touch_DOUT    (uint32)(0x01<<15)/*PC15*/
#define Touch_PIRQ    (uint32)(0x01<<26)/*PA26*/

#define set_dclk()    AT91F_PIO_SetOutput(AT91C_BASE_PIOC, Touch_DCLK)
#define clr_dclk()    AT91F_PIO_ClearOutput(AT91C_BASE_PIOC, Touch_DCLK)
#define set_din()    AT91F_PIO_SetOutput(AT91C_BASE_PIOC, Touch_DIN)
#define clr_din()    AT91F_PIO_ClearOutput(AT91C_BASE_PIOC, Touch_DIN)
#define set_chcs()    AT91F_PIO_SetOutput(AT91C_BASE_PIOC, Touch_CS)
#define clr_chcs()    AT91F_PIO_ClearOutput(AT91C_BASE_PIOC, Touch_CS)
#define Set_InputMod() AT91C_BASE_PIOA->PIO_PER = Touch_PIRQ
#define Set_IRQMod()    AT91C_BASE_PIOA->PIO_PDR = Touch_PIRQ
#define Get_TouIRQ()    (AT91C_BASE_PIOA->PIO_PDSR & Touch_PIRQ)
//--------------------------------------------------------------
void Touch_write(uint8 data)//触屏传输速率最大125Kbits
{uint8 i;
    for(i = 0;i < 8;i++)
    {
        clr_dclk();            //低电平改变数据数据
        if(data & 0x80)set_din();
        else clr_din();
        data <<= 1;
        set_dclk();
    }
    clr_dclk();
}
//--------------------------------------------------------------
uint16 Touch_read(void)//触屏传输速率最大125Kbits
{uint8 i;
uint16 result = 0;
    for(i = 0;i < 12;i++)
    {
        result <<= 1;
        set_dclk();            //仅有下降沿读取数据
        clr_dclk();
        if(AT91C_BASE_PIOC->PIO_PDSR & Touch_DOUT)result++;
    }
    return result;
}
//---------------------------------------------------------------
uint16 Get_X(void)
{
    Touch_write(0x90);
    return Touch_read();
}
uint16 Get_Y(void)
{
    Touch_write(0xD0);
    return Touch_read();
}
//---------------------------------------------------------------
void Touch_IRQ_proc(void)
{
    AT91C_BASE_AIC->AIC_ICCR = ( 1 << AT91C_ID_IRQ1 );
    AT91F_AIC_DisableIt(AT91C_BASE_AIC, AT91C_ID_IRQ1);
    Set_InputMod();
    xTouch->down = true;
    xTouch->up = false;
    xTouch->IRQ_Mod = false;
    xxxdprintf("\r\nTouch按下\r\n");
}
//---------------------------------------------------------------
#define XTOUCH_DEBGU 1
#if XTOUCH_DEBGU
static char data[50];
#endif
void xTouchproc(void)
{
    if(xTouch->down == true)
    {
        if( Get_TouIRQ() )
        {//触屏抬起
        {uint32 count;for(count = 0;count < 0xfff;count++);}
            if( Get_TouIRQ() )
            {
                xTouch->down = false;
                xTouch->up = true;
               
                #if XTOUCH_DEBGU
                xxxdprintf("\r\nTouch抬起\r\n");
                #endif
            }
        }else
            {uint16 x,y;OS_CPU_SR cpu_sr;
                clr_chcs();
                x = Get_X();
                y = Get_Y();
                OS_ENTER_CRITICAL();
                xTouch->value.x = x;
                xTouch->value.y = y;
                OS_EXIT_CRITICAL();
                set_chcs();
               
                #if XTOUCH_DEBGU
                sprintf(data,"x=%d,y=%d\r\n",
                xTouch->value.x,xTouch->value.y);
                xxxdprintf(data);
                #endif
            }
    }
    if(xTouch->up == true)
    {
        if(xTouch->IRQ_Mod == false)
        {
            xTouch->IRQ_Mod = true;
            Set_IRQMod();
            AT91C_BASE_AIC->AIC_ICCR =
                                ( 1 << AT91C_ID_IRQ1 );
            AT91F_AIC_EnableIt(AT91C_BASE_AIC,
                                AT91C_ID_IRQ1);
        }
    }
}