我的触摸屏驱动源代码.doc

我的触摸屏驱动源代码 /*C头文件*/#include au_types.h#defineDEVICE_NAME tpanel#define IRQ_1 7#define GPIO_1_PORT GPIO_1#define GPIO_1_PORT_ADDR GPIO_1_BASE/ 触摸屏返回值结构体typedef struct uint32 pressure;uint32 x;uint32 y;TS_RET;/ 校准值结构体typedef structint32 x;int32 y;TS_POINT;static TS_POINTTsPoint10;#defineTS_IOC_MAGIC0xd9#defineCALIBRATE_IOW(TS_IOC_MAGIC, 1, sizeof(TsPoint)#defineCALIBRATE_START_IOW(TS_IOC_MAGIC, 2, sizeof(uint8)/ 以下为触摸屏控制器管脚设置#define ADS7843_CSS()writew(0xff, (GPIO_1_PORT_ADDR + 0x200)/ cs = 1 (p1.7)#define ADS7843_CSC()writew(0x00, (GPIO_1_PORT_ADDR + 0x200)/ cs = 0#define ADS7843_DCLKS()writew(0xff, (GPIO_1_PORT_ADDR + 0x40)/ dclk = 1(p1.4)#define ADS7843_DCLKC()writew(0x00, (GPIO_1_PORT_ADDR + 0x40)/ dclk = 0#define ADS7843_DINS()writew(0xff, (GPIO_1_PORT_ADDR + 0x20)/ din = 1(p.3)#define ADS7843_DINC()writew(0x00, (GPIO_1_PORT_ADDR + 0x20)/ din = 0#define ADS7843_DOUTR()readw(GPIO_1_PORT_ADDR + 0x10)/ dout p1.2/ ADS7843控制字 #define AIN_X 0xD4#define AIN_Y 0x94/ ADS7846控制字/#define AIN_X 0xD0 /#define AIN_Y 0x90 /#define DELAY_200NS200/ 操作时序控制宏(即延时控制值)#define DELAY_200NS400/ 操作时序控制宏(即延时控制值)#definePEN_DOWN1/ 笔按下#definePEN_UP2/ 笔抬起#definePEN_FLEETING4/ 笔拖拽#defineMAX_TS_BUF16/ 最大缓冲区数#defineBUF_HEAD(TsDev.bufTsDev.head)/ 取队列头值#defineBUF_TAIL(TsDev.bufTsDev.tail)/ 取队列尾值#defineINCBUF(x, mod)(+(x) & (mod)-1)/ 位移加一#defineTS_TIMER_DELAY(HZ/28) / 定时时长为36ms/#defineTS_TIMER_DELAY(HZ/15)#defineTS_TIMER_DELAY1(HZ/10)/ 定时时长为100ms/*C源代码*/#include #include #include #include #include / printk#include / file结构#include #include #include #include #include #include #include #include #include #include #include #include #include #include hi_gpio.h#include touch_screen.h#define_CALIBRATE_1/ 使用校准参数,否则使用固定的校准值/ 以下为触摸屏较正用#define SCREEN_WIDTH800#define SCREEN_HEIGHT460#define NR_EQUATIONS6#define LSHIFT(x) (x)12)static int VarsNR_EQUATIONS*4;static int CalibrateOk = FALSE; / 是否校准过#define Vars1Vars#define Vars2(Vars + NR_EQUATIONS)#define Vars3(Vars + NR_EQUATIONS * 2)#define Vars4(Vars + NR_EQUATIONS * 3)/ 触摸屏设备结构体typedef struct uint32penStatus;TS_RETbufMAX_TS_BUF;uint32head, tail;wait_queue_head_twq;spinlock_tlock;TS_DEV;staticTS_DEVTsDev;static struct timer_list ts_timer;/ 定义定时器变量staticuint32touch_screen_major = 0;/ 触摸屏设备号static uint8 Ready = 1;/* 名称：DelayNo()* 功能：短软件延时。* 入口参数：i 延时参数，值越大，延时越久* 出口参数：无*/void DelayNo(uint32 i) for(; i0; i-);/* 名称：TestDelayNo()* 功能：测试短软件延时，以便于产生正确的时序。* 入口参数：无* 出口参数：无*/void TestDelayNo(void) while(1) ADS7843_DCLKS(); DelayNo(DELAY_200NS); ADS7843_DCLKC(); DelayNo(DELAY_200NS); /* 名称：ADS7843_IOInit()* 功能：初始化ADS7843的控制I/O，CS=1，DCLK=0，DIN=0。* 入口参数：无* 出口参数：无*/void ADS7843_IOInit(void) ADS7843_CSS(); / CS = 1 ADS7843_DCLKC(); / DCLK = 0 ADS7843_DINC();/ DIN = 0 DelayNo(DELAY_200NS);/* 名称：ADS7843_IRQR()* 功能：ADS7843的PENIRQ引脚测量，返回当前此引脚的电平值。* 入口参数：无* 出口参数：返回为0表示PENIRQ为低电平状态，否则为高电平。*/uint8 ADS7843_IRQR(void)uint8 dat3;uint8val;DelayNo(1);val = readw(GPIO_1_PORT_ADDR + 0x80); if(val) dat0 = 1; else dat0 = 0;/DelayNo(1);val = readw(GPIO_1_PORT_ADDR + 0x80); if(val) dat1 = 1; else dat1 = 0;/DelayNo(1);val = readw(GPIO_1_PORT_ADDR + 0x80); if(val) dat2 = 1; else dat2 = 0;/DelayNo(1); if(dat0 + dat1 + dat2) 1) return(1); else return(0);/* 名称：ADS7843_WriteRead()* 功能：对ADS7843进行读写操作。操作按照ADS7843的规定，*24Clocks，先写8位控制数据，然后读取12位的转换结果。* 入口参数：data控制数据* 出口参数：返回值为读出的数据*/ void ADS7843_WriteRead(uint8 data, uint16 *ret) uint8 i; uint16 ret_dat;data = data | 0x80;/ 设置S位ADS7843_IOInit();ADS7843_CSC();/ CS = 0for(i=0; i8; i+) if( (data&0x80) != 0 ) ADS7843_DINS();/ DIN = 1 else ADS7843_DINC();/ DIN = 0DelayNo(DELAY_200NS);ADS7843_DCLKS();/ DCLK = 1DelayNo(DELAY_200NS);ADS7843_DCLKC();/ DCLK = 0 data = data1;ADS7843_DINC();/ DIN = 0DelayNo(DELAY_200NS * 3);ADS7843_DCLKS();/ DCLK = 1DelayNo(DELAY_200NS);ADS7843_DCLKC(); / DCLK = 0ret_dat = 0;for(i=0; i12; i+) ret_dat = ret_dat1; DelayNo(DELAY_200NS); ADS7843_DCLKS();/ DCLK = 1 if( ADS7843_DOUTR() != 0 ) ret_dat = ret_dat | 1; DelayNo(DELAY_200NS);ADS7843_DCLKC(); / DCLK = 0 if(i = 6) DelayNo(DELAY_200NS * 2); for(i=0; i3; i+) DelayNo(DELAY_200NS); ADS7843_DCLKS();/ DCLK = 1 DelayNo(DELAY_200NS);ADS7843_DCLKC();/ DCLK = 0 DelayNo(DELAY_200NS);ADS7843_CSS();/ CS = 1*ret = ret_dat;/* 名称：DoGaussianElimination* 功能：* 入口参数：* 出口参数：*/ static uint8 DoGaussianElimination(int* x, const TS_POINT* src_pts, const TS_POINT* dst_pts) int x12, x23, y12, y23, nx12, nx23, ny12, ny23; int numerator, denominator1, denominator2; x12 = (src_pts0.x - src_pts1.x); x23 = (src_pts1.x - src_pts2.x); y12 = (src_pts0.y - src_pts1.y); y23 = (src_pts1.y - src_pts2.y); nx12 = (dst_pts0.x - dst_pts1.x); nx23 = (dst_pts1.x - dst_pts2.x); ny12 = (dst_pts0.y - dst_pts1.y); ny23 = (dst_pts1.y - dst_pts2.y); denominator1 = x12*y23 - x23*y12; if (denominator1 = 0) return FALSE; denominator2 = y12*x23 - y23*x12; if (denominator2 = 0) return FALSE; numerator = nx12*y23 - nx23*y12; x 0 = LSHIFT (numerator) / denominator1; numerator = nx12*x23 - nx23*x12; x 1 = LSHIFT (numerator) / denominator2; x 2 = LSHIFT (dst_pts 0.x) - x 0 * src_pts 0.x - x 1 * src_pts 0.y; numerator = ny12*y23 - ny23*y12; x 3 = LSHIFT (numerator) / denominator1; numerator = ny12*x23 - ny23*x12; x 4 = LSHIFT (numerator) / denominator2; x 5 = LSHIFT (dst_pts 0.y) - x 3 * src_pts 0.x - x 4 * src_pts 0.y; return TRUE;/* 名称：SetMouseCalibrationParameters* 功能：* 入口参数：* 出口参数：*/ static uint8 SetMouseCalibrationParameters(const TS_POINT* src_pts, const TS_POINT* dst_pts) TS_POINT my_src_pts 3; TS_POINT my_dst_pts 3; my_src_pts0 = src_pts0; my_src_pts1 = src_pts1; my_src_pts2 = src_pts4; my_dst_pts0 = dst_pts0; my_dst_pts1 = dst_pts1; my_dst_pts2 = dst_pts4; if (!DoGaussianElimination(Vars1, my_src_pts, my_dst_pts) return FALSE; my_src_pts0 = src_pts1; my_src_pts1 = src_pts2; my_src_pts2 = src_pts4; my_dst_pts0 = dst_pts1; my_dst_pts1 = dst_pts2; my_dst_pts2 = dst_pts4; if (!DoGaussianElimination(Vars2, my_src_pts, my_dst_pts) return FALSE; my_src_pts0 = src_pts2; my_src_pts1 = src_pts3; my_src_pts2 = src_pts4; my_dst_pts0 = dst_pts2; my_dst_pts1 = dst_pts3; my_dst_pts2 = dst_pts4; if (!DoGaussianElimination(Vars3, my_src_pts, my_dst_pts) return FALSE; my_src_pts0 = src_pts0; my_src_pts1 = src_pts3; my_src_pts2 = src_pts4; my_dst_pts0 = dst_pts0; my_dst_pts1 = dst_pts3; my_dst_pts2 = dst_pts4; if (!DoGaussianElimination(Vars4, my_src_pts, my_dst_pts) return FALSE; #if 0printf(Vars:);int i;for (i=0; i0 & !(i%4)printf(n);printf(%dt, Varsi);printf(n);#endif return TRUE;/* 名称：DoMouseCalibrate* 功能：校准* 入口参数：* 出口参数：*/ int32 DoMouseCalibrate(uint16 * x0, uint16 * y0)#ifdef _CALIBRATE_/ 使用校准参数,否则使用固定的校准值 int x = *x0;int y = *y0; int x1, y1, x2, y2, x3, y3, x4, y4;printk(src: x:%4d y:%4dn, x, y); x1 = Vars10 * x + Vars11 * y + Vars12; y1 = Vars13 * x + Vars14 * y + Vars15; x2 = Vars20 * x + Vars21 * y + Vars22; y2 = Vars23 * x + Vars24 * y + Vars25; x3 = Vars30 * x + Vars31 * y + Vars32; y3 = Vars33 * x + Vars34 * y + Vars35; x4 = Vars40 * x + Vars41 * y + Vars42; y4 = Vars43 * x + Vars44 * y + Vars45;x = RSHIFT(x1 + x2 + x3 + x4);y = RSHIFT(y1 + y2 + y3 + y4);if (x SCREEN_WIDTH)x = SCREEN_WIDTH;if (y SCREEN_HEIGHT)y = SCREEN_HEIGHT; *x0 = x;*y0 = y;printk(des: x:%4d y:%4dn, x, y);#else#define TOUCH_LEFT(709)/100#define TOUCH_TOP(1093)/400#define TOUCH_RIGHT(3369)/100#define TOUCH_BOTTOM(3215)/700int32 ScaleX = (TOUCH_RIGHT - TOUCH_LEFT) * 10 / 600;/10倍int32 ScaleY = (TOUCH_BOTTOM - TOUCH_TOP) * 10 / 300;/10倍int32 x, y;x = *x0;y = *y0; x = (x-TOUCH_LEFT)*10 / ScaleX + 100;y = (y-TOUCH_TOP)*10 / ScaleY + 100;if (xSCREEN_WIDTH)x = SCREEN_WIDTH;if (ySCREEN_HEIGHT)y = SCREEN_HEIGHT;*x0 = x;*y0 = y;printk(*x:%dt y%dn, x, y);#endifreturn TRUE;/* 名 称：get_lcd_xy* 功 能：读取触摸屏上触摸点的坐标。* 程序会一直等待，直到有触摸输入。* 入口参数：x 用于保存触摸点x坐标(LCD)的变量指针* y 用于保存触摸点y坐标(LCD)的变量指针* 出口参数：无* 说 明：先通测量y轴的触摸输入，判断是否有触摸动作。如果有，则进行数据采集，*并进行去极值平均滤波处理。最后还要判断触摸输入是否合法，只有* 当触摸输入合法时才返回。*/int32 get_lcd_xy(uint16 *vx, uint16 *vy) static uint8i, temp;static uint16 vx_dat = 0; static uint16vy_dat = 0;static uint16x_max_data = 0;static uint16x_min_data = 0;static uint16y_max_data = 0;static uint16y_min_data = 0;staticuint32x_sum = 0;staticuint32y_sum = 0;/ 屏校准后不读取拖动状态的数据,只有按下和抬起有发送给GUIif (TsDev.penStatus = PEN_FLEETING) & (CalibrateOk = TRUE)return -1;while(1) / 进行数据采集 ADS7843_WriteRead(AIN_X, &vx_dat);x_max_data = vx_dat;x_min_data = vx_dat;x_sum = vx_dat; ADS7843_WriteRead(AIN_Y, &vy_dat);y_max_data = vy_dat;y_min_data = vy_dat;y_sum = vy_dat;for (i = 1; i x_max_data)x_max_data = vx_dat;if (vx_dat y_max_data)y_max_data = vy_dat;if (vy_dat 200)return -1;if (y_max_data - y_min_data) 200)return -1;*/if (i x = BUF_TAIL.x;ts_ret-y = BUF_TAIL.y;ts_ret-pressure = BUF_TAIL.pressure;TsDev.tail = INCBUF(TsDev.tail, MAX_TS_BUF);/printk(touchscreenko ts_get_value_2n);return sizeof(TS_RET);else Ready = 0;return -1;/* Function:gpio_init Description: GPIO初始化 Input: 无 Output:无 Return:无 Others:*/void gpio_init(void)int32 tmp;/ 设置GPIO1方向gpio_dirgetbyte(GPIO_1_PORT, &tmp);printk(gpio_init-:0x%xn,GPIO_1_PORT);tmp |= 0x98;/ 设置gpio1的3,4,7为输出tmp &= 0xDB;/ 设置gpio1的2,5为输入gpio_dirsetbyte(GPIO_1_PORT, tmp);/ 设置GPIO1中的5为中断口gpio_interruptset_byte(GPIO_1_PORT,0x20,0,0,1/ SENSE_BOTH,/ SENSE_LEVEL,/ EVENT_FALLING_EDGE);/ 屏蔽GPIO1.5中断tmp = 0x20;gpio_interruptdisable_byte(GPIO_1_PORT, tmp);/ 清除GPIO1.5中断标志gpio_interruptclear_byte(GPIO_1_PORT,tmp);/ 使能GPIO1.5中断gpio_interruptenable_byte(GPIO_1_PORT,tmp);/* Function:ts_interrupt Description: 触摸屏中断处理 Input: 无 Output:无 Return:无 Others:*/static irqreturn_t ts_interrupt(int32 irq, void *dev_id, struct pt_regs *reg) int32 handled = 0;uint8 current_irq;int32 tmp;printk(KERN_NOTICE ENTER INTE);tmp = 0x20; gpio_interruptdisable_byte(GPIO_1_PORT, tmp);/ 查询该管脚中断是否匹配上 current_irq = readw(GPIO_1_PORT_ADDR + GPIO_RIS); current_irq = current_irq & tmp;/ 读取中断管脚上的电平tmp = ADS7843_IRQR();if (current_irq = 0 | tmp != 0)/ 中断没匹配上或中断管脚上的电平不为低则不处理tmp = 0x20;gpio_interruptclear_byte(GPIO_1_PORT, tmp);gpio_interruptenable_byte(GPIO_1_PORT, tmp);else/printk(pen_downn);TsDev.penStatus = PEN_DOWN;/ 笔状态置为按下ts_timer.expires = jiffies + TS_TIMER_DELAY;add_timer(&ts_timer);/ 启动定时器/printk(ts_interruptn);handled = 1; return IRQ_RETVAL(handled);/* Function:ts_timer_handler Description: 定时器处理 Input: 无 Output:无 Return:无 Others:*/static void ts_timer_handler(unsigned long data)int32 temp;static uint16 x = 0;static uint16 y = 0;/ 读取中断管脚上的电平temp = ADS7843_IRQR();if (temp = 0)/ 去抖处理/printk(PEN_FLEETINGn);temp = get_lcd_xy(&x, &y);/ 读取触摸屏的值if (temp = 0)ts_put_value(x, y);/ 把笔状态与触摸屏的值加入到队列中TsDev.penStatus = PEN_FLEETING;/ 下一个状态改为拖拽ts_timer.expires = jiffies + TS_TIMER_DELAY1;add_timer(&ts_timer);else if (TsDev.penStatus != PEN_UP)del_timer(&ts_timer);if (TsDev.penStatus = PEN_FLEETING)TsDev.penStatus = PEN_UP;ts_put_value(x, y);/ 把抬笔状态加入到队列中TsDev.penStatus = PEN_UP;temp = 0x20;gpio_interruptclear_byte(GPIO_1_PORT, temp);gpio_interruptenable_byte(GPIO_1_PORT, temp);/* Function:ts_open Description: 打开设备 Input: 无 Output:无 Return:无 Others:*/static int32 ts_open(struct inode *inode ,struct file *file)TsDev.head = 0;TsDev.