touchtest.c

Keil工程例子,NXP新出的芯片lpc2478的示例代码

#include "LPC24xx.h"
#include "type.h"
#include "data_types.h"
#include "touch_screen.h"
#include "lcd_driver.h"
#include "lcd_params.h"
#include "irq.h"
#include "uart.h"

extern INT32U x_values[num_samples]; // array to store x_samples
extern INT32U y_values[num_samples]; // array to store y_samples
static INT32U x_pos, y_pos;
volatile DWORD eint0_counter;

/***********************************************************************
 *
 * Function: gpio0_handler
 *
 * Purpose: gpio0_handler.
 *
 * Processing:
 *
 * Parameters: 	None
 *
 * Outputs: None
 *
 * Returns: None
 *
 **********************************************************************/
__irq void IRQ_Handler (void)
{   INT32U i;
	FIO3CLR=0X00FF0000;
	FIO3SET=0x00C30000;
if (IO_INT_STAT & 0x1)
    {
   //     timer_delay(debounce);        /* debounce the touch */
        if (touch_detect())        /* loop as long as screen is touched */
        {

            read_ch_x();              /* read and collect the x values */
            read_ch_y();              /* read and collect the y values */

            x_pos = 0;
            for (i=0; i < num_samples; i++)
            {
                x_pos += x_values[i]; /* add up the conversion results */
            }
            x_pos = x_pos / num_samples; /* get average */

            y_pos = 0;
            for (i=0; i < num_samples; i++)
            {
                y_pos += y_values[i]; /* add up conversion results */
            }
            y_pos = y_pos / num_samples; /* get average */
            y_pos =y_pos;
            UARTSendChar(x_pos, y_pos);
			test_touch(x_pos,y_pos);
			delayMs(1500);
        }
	  touch_detect();
     IO0_INT_CLR = X_plus;           /* clear X-plus interrupt */
     VICAddress = 0;               /* Acknowledge Interrupt */
    }

}

/*****************************************************************************
** Function name:		EINTInit
**
** Descriptions:		Install_irq
**
** parameters:			None
** Returned value:		true or false, return false if the interrupt
**				handler can't be installed to the VIC table.
** 
*****************************************************************************/
DWORD EINTInit(void)
{	
	VICIntSelect=0x00000000;
    IO0_INT_CLR = 0xffffffff;
	IO2_INT_CLR = 0xffffffff;

    if ( install_irq( EINT3_INT, (void *)IRQ_Handler, HIGHEST_PRIORITY ) == FALSE )
   {
		return (FALSE);
    }
    VICVectAddr17 = (DWORD)IRQ_Handler;
    VICIntEnable = 1 << 17; 
	IO0_INT_EN_F = X_plus;   
    return( TRUE );
}

/******************************************************************************
**                            End Of File
******************************************************************************/