/*****************************************
NAME: Touchpanel.c
DESC: ADC & Touch screen test
HISTORY:
2003.09.23:Leon YH KIM: draft ver 1.0
*****************************************/
#include "def.h"
#include "2440addr.h"
#include "2440lib.h"
#define REQCNT 30
#define ADCPRS 9 //YH 0627
#define LOOP 1
void __irq AdcTsAuto(void);
int count=0;
volatile int xdata, ydata;
void Test_Touchpanel(void)
{
rADCDLY=50000; //Normal conversion mode delay about (1/3.6864M)*50000=13.56ms
//Touch down to conversion delay time width , X coordinate & Y coordinate conversion time width setting
rADCCON=(1<<14)+(ADCPRS<<6); //ADCPRS En, ADCPRS Value
// A/D converter prescaler enable , PRSCVL value setting , A/D Frequency = PCLK / (PRSCVL + 1)
Uart_Printf("ADC touch screen test\n");
rADCTSC=0xd3; //Wfait,XP_PU,XP_Dis,XM_Dis,YP_Dis,YM_En
//Detect stylus down interrupt signal , YM Enable , YP Disable , XM Disable, XP Disable , XP Pull-up enable , Normal ADC Conversion , Waiting for interrupt mode
pISR_ADC = (int)AdcTsAuto;//将中断处理程序名放入中断向量表中对应地址
//
rINTMSK=~BIT_ADC; //ADC Touch Screen Mask bit clear
rINTSUBMSK=~(BIT_SUB_TC);//Touch Screen Mask bit clear
Uart_Printf("\nType any key to exit!!!\n");
Uart_Printf("\nStylus Down, please...... \n");
Uart_Getch();
rINTSUBMSK|=BIT_SUB_TC;//Touch Screen Mask bit set
rINTMSK|=BIT_ADC;//ADC Touch Screen Mask bit set
Uart_Printf("Touch Screen Test is Finished!!!\n");
}
void __irq AdcTsAuto(void)
{
int i;
U32 saveAdcdly;
if(rADCDAT0&0x8000)//判断 updown bit ，如果提起则
{
//Uart_Printf("\nStylus Up!!\n");
rADCTSC&=0xff; // Set stylus down interrupt bit
}
//else
//Uart_Printf("\nStylus Down!!\n");
rADCTSC=(1<<3)|(1<<2); //XP Pull-up disable, Seq. X,Y postion measure.
saveAdcdly=rADCDLY;
rADCDLY=40000; //Normal conversion mode delay about (1/50M)*40000=0.8ms
rADCCON|=0x1; //start ADC AD转换开始且该位在开始后清零
while(rADCCON & 0x1); //check if Enable_start is low
while(!(rADCCON & 0x8000)); //check if EC(End of Conversion) flag is high, This line is necessary~!!
while(!(rSRCPND & (BIT_ADC))); //check if ADC is finished with interrupt bit
xdata=(rADCDAT0&0x3ff);
ydata=(rADCDAT1&0x3ff);
//YH 0627, To check Stylus Up Interrupt.
rSUBSRCPND|=BIT_SUB_TC;//
ClearPending(BIT_ADC);//
rINTSUBMSK=~(BIT_SUB_TC);//
rINTMSK=~(BIT_ADC);//
rADCTSC =0xd3; //Waiting for interrupt
rADCTSC=rADCTSC|(1<<8); // Detect stylus up interrupt signal.
while(1) //to check Pen-up state
{
if(rSUBSRCPND & (BIT_SUB_TC)) //check if ADC is finished with interrupt bit
{
//Uart_Printf("Stylus Up Interrupt~!\n");
break; //if Stylus is up(1) state
}
}
Uart_Printf("count=%03d XP=%04d, YP=%04d\n", count++, xdata, ydata); //X-position Conversion data
rADCDLY=saveAdcdly;
rADCTSC=rADCTSC&~(1<<8); // Detect stylus Down interrupt signal.
rSUBSRCPND|=BIT_SUB_TC;
rINTSUBMSK=~(BIT_SUB_TC); // Unmask sub interrupt (TC)
ClearPending(BIT_ADC);
}
自己看单句还基本看明白了,可整个流程不了解,如果我要多次采集一个点,又该如何处理呢,有没有裸奔玩触摸屏的朋友指导一二 ....
