1、遇到的问题
a、刚开始不能够进入中断。后来检查这句话导致。
ADCCON |= 1<<0; /*ADCCON = 1<<0;原来写的这一句话,把原来的值全部修改了就出问题了*/
b、后来发现ADC转换有问题，标绿色的语句就是从下到上的执行顺序。这个是有问题的程序（因为没有使用ADC中断对转换数据进行读取，而是通过延时，对ADC的数据进行读取，这样明显是有问题的）
void measure_xy(void)
{
int x,y;
//x = ADCDAT0 & 0X3ff;
//printf("x = %08d ", x);
//y = ADCDAT1 & 0X3ff;
//printf("y = %08d\n\r", y); //这两段加上哪一段都行，程序能能进行转换
//x = 3000; //对这个数值进行了修改500及以下都不能运行到if判断里，1000可以运行到if判断里面
//while(x--);
if(!(ADCDAT0 & (1<<15)))
{
x = ADCDAT0 & 0X3ff;
printf("x = %08d ", x);
}
if(!(ADCDAT1 & (1<<15)))
{
y = ADCDAT1 & 0X3ff;
printf("y = %08d\n\r", y);
}
ADCCON &= ~(1<<0);
touchscreen_int_up();
}
void touchscreen_auto_measure(void)
{
ADCTSC = AUTO_PST_AUTO | XY_PST_NO_OPERATION;
ADCCON |= 1<<0; /*ADCCON = 1<<0;原来写的这一句话,把原来的值全部修改了就出问题了*/
measure_xy();
//printf("auto_measure done \n\r");
}
void AdcTsIntHandle(int irq)
{
/*读状态位判断处理*/
if(SUBSRCPND & (1 << 9))
{
if(ADCUPDN & (1<<0))
{
/*触摸屏按下*/
//printf("down ADCUPDN = 0x%x\n\r", ADCUPDN);
ADCUPDN &= ~(1<<0);
touchscreen_auto_measure();
}
if(ADCUPDN & (1<<1))
{
/*触摸屏松开*/
//printf("up ADCUPDN = 0x%x\n\r", ADCUPDN);
ADCUPDN &= ~(1<<1);
touchscreen_int_down();
}
}
if(SUBSRCPND & (1 << 10))
{
//printf("ADC irq %x\n\r");
}
/*清除中断标志位*/
SRCPND = 1 << 31;
INTPND = 1 << 31;
SUBSRCPND |= (1<<9) | (1<<10);
}
正常的完整程序如下所示
另外x y 坐标好像是反了，但是软件可以处理，后面用到时再说。
#include "../s3c2440_soc.h"
#define UD_SEN_DOWN (0<<8)
#define UD_SEN_UP (1<<8)
#define YM_SEN_DISABLE (0<<7)
#define YM_SEN_ENABLE (1<<7)
#define YP_SEN_ENABLE (0<<6)
#define YP_SEN_DISABLE (1<<6)
#define XM_SEN_DISABLE (0<<5)
#define XM_SEN_ENABLE (1<<5)
#define XP_SEN_ENABLE (0<<4)
#define XP_SEN_DISABLE (1<<4)
#define PULLUP_ENABLE (0<<3)
#define PULLUP_DISABLE (1<<3)
#define AUTO_PST_AUTO (1<<2)
#define XY_PST_NO_OPERATION (0)
#define XY_PST_X_MEASURE (1)
#define XY_PST_Y_MEASURE (2)
#define XY_PST_WAITING (3)
void touchscreen_int_up(void)
{
ADCTSC = UD_SEN_UP| YM_SEN_ENABLE | YP_SEN_DISABLE | XM_SEN_DISABLE | XP_SEN_DISABLE | PULLUP_ENABLE | XY_PST_WAITING;
}
void touchscreen_int_down(void)
{
ADCTSC = UD_SEN_DOWN| YM_SEN_ENABLE | YP_SEN_DISABLE | XM_SEN_DISABLE | XP_SEN_DISABLE | PULLUP_ENABLE | XY_PST_WAITING;
}
void measure_xy(void)
{
int x,y;
//x = ADCDAT0 & 0X3ff;
//printf("x = %08d ", x);
//y = ADCDAT1 & 0X3ff;
//printf("y = %08d\n\r", y);
//x = 3000;
//while(x--);
if(!(ADCDAT0 & (1<<15)))
{
x = ADCDAT0 & 0X3ff;
printf("x = %08d ", x);
}
if(!(ADCDAT1 & (1<<15)))
{
y = ADCDAT1 & 0X3ff;
printf("y = %08d\n\r", y);
}
ADCCON &= ~(1<<0);
touchscreen_int_up();
}
void touchscreen_auto_measure(void)
{
ADCTSC = AUTO_PST_AUTO | XY_PST_NO_OPERATION;
ADCCON |= 1<<0; /*ADCCON = 1<<0;原来写的这一句话,把原来的值全部修改了就出问题了*/
//measure_xy();
//printf("auto_measure done \n\r");
}
void AdcTsIntHandle(int irq)
{
/*读状态位判断处理*/
if(SUBSRCPND & (1 << 9))
{
if(ADCUPDN & (1<<0))
{
/*触摸屏按下*/
//printf("down ADCUPDN = 0x%x\n\r", ADCUPDN);
ADCUPDN &= ~(1<<0);
touchscreen_auto_measure();
}
if(ADCUPDN & (1<<1))
{
/*触摸屏松开*/
//printf("up ADCUPDN = 0x%x\n\r", ADCUPDN);
ADCUPDN &= ~(1<<1);
touchscreen_int_down();
}
}
if(SUBSRCPND & (1 << 10))
{
//printf("ADC irq %x\n\r");
measure_xy();
}
/*清除中断标志位*/
SRCPND = 1 << 31;
INTPND = 1 << 31;
SUBSRCPND |= (1<<9) | (1<<10);
}
void touchscreen_initw(void)
{
/*触摸屏控制设置*/
ADCCON = (1<<14) | (49<<6) | (0<<3) ;
//ADCTSC = UD_SEN_DOWN| YM_SEN_ENABLE | YP_SEN_DISABLE | XM_SEN_DISABLE | XP_SEN_DISABLE | PULLUP_ENABLE | AUTO_PST_AUTO | XY_PST_WAITING;
ADCDLY = 60000;
/*中断设置*/
//INTMOD &= ~(1<<31);/*设置ADC为irq中断模式*/
//INTMSK &= ~(1<<31);/*使能ADC中断*/
SUBSRCPND = (1<<9) | (1<<10);
SRCPND = (1<<31) | (1<<25);
INTPND = (1<<31) | (1<<25);
register_irq(31,AdcTsIntHandle);
INTSUBMSK &= ~((1<<9) | (1<<10));/*使能touchscreen中断*/
touchscreen_int_down();
printf("touchscreen_init\n");
printf("INTSUBMSK = 0x%x,INTMSK = 0x%x,SUBSRCPND =0x%x,SRCPND = 0x%x,INTPND = 0x%x\n\r",INTSUBMSK,INTMSK,SUBSRCPND,SRCPND,INTPND);
}
原文：https://www.cnblogs.com/youthforever/p/12586433.html