S5PV210 Linux 模拟SPI方式控制ADS7846触摸屏驱动
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/***************************************************************************************ads7846 touch screenads.c*Light< lightwu@hotmail.com >*20011-11-28****************************************************************************************/#include <linux/errno.h>#include <linux/kernel.h>#include <linux/module.h>#include <linux/slab.h>#include <linux/input.h>#include <linux/init.h>#include <linux/serio.h>#include <linux/delay.h>#include <linux/platform_device.h>#include <linux/clk.h>#include <linux/fs.h>#include <linux/poll.h>#include <linux/irq.h>#include <linux/interrupt.h>#include <linux/cdev.h>#include <linux/miscdevice.h>#include <asm/uaccess.h>#include <asm/io.h>#include <asm/irq.h>#include <mach/hardware.h>#include <mach/map.h>#include <mach/regs-clock.h>#include <mach/regs-gpio.h>#include <plat/gpio-cfg.h>#include <mach/gpio.h>#define ADS7846_CNV_NBR 8 //ADC连续转换的次数struct ads7846_ts_info { struct input_dev *dev; unsigned int xp; //x方向位置 unsigned int yp; //y方向位置 unsigned int count; //adc转换次数 unsigned int cnv_nbr; unsigned int x_buf[ADS7846_CNV_NBR]; //ad转换buf unsigned int y_buf[ADS7846_CNV_NBR]; };static struct ads7846_ts_info*ts;static struct input_dev *OFN_dev;int absX = 0;int absY = 0;#define ADS7846_GPIO_MISO6//gpb6#define ADS7846_GPIO_MOSI7//gpb7#define ADS7846_GPIO_CLK4//gpb4#define ADS7846_GPIO_CS5//gpb5// ADS7846 Control Byte bit defines#define ADS7846_CMD_START0x0080#define ADS7846_ADDR_BIT4#define ADS7846_ADDR_MASK (0x7<<ADS7846_ADDR_BIT)#define ADS7846_MEASURE_X (0x5<<ADS7846_ADDR_BIT)#define ADS7846_MEASURE_Y (0x1<<ADS7846_ADDR_BIT)#define ADS7846_MEASURE_Z1 (0x3<<ADS7846_ADDR_BIT)#define ADS7846_MEASURE_Z2 (0x4<<ADS7846_ADDR_BIT)#define ADS7846_8BITS (1<<3)#define ADS7846_12BITS 0#define ADS7846_SER (1<<2)#define ADS7846_DFR 0#define ADS7846_PWR_BIT 0#define ADS7846_PD 0#define ADS7846_ADC_ON (0x1<<ADS7846_PWR_BIT)#define ADS7846_REF_ON (0x2<<ADS7846_PWR_BIT)#define ADS7846_REF_ADC_ON (0x3<<ADS7846_PWR_BIT)#define MEASURE_8BIT_X\ (unsigned short)(ADS7846_CMD_START | ADS7846_MEASURE_X | ADS7846_8BITS | ADS7846_DFR | ADS7846_PD)#define MEASURE_8BIT_Y\ (unsigned short)(ADS7846_CMD_START | ADS7846_MEASURE_Y | ADS7846_8BITS | ADS7846_DFR | ADS7846_PD)#define MEASURE_12BIT_X \ (unsigned short)(ADS7846_CMD_START | ADS7846_MEASURE_X | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD)#define MEASURE_12BIT_Y \ (unsigned short)(ADS7846_CMD_START | ADS7846_MEASURE_Y | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD)#define MEASURE_12BIT_Z1 \ (unsigned char)(ADS7846_MEASURE_Z1 | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD)#define MEASURE_12BIT_Z2 \ (unsigned char)(ADS7846_MEASURE_Z2 | ADS7846_12BITS | ADS7846_DFR | ADS7846_PD)static inline void set_miso_as_up(void)//gpc0{s3c_gpio_setpull(S5PV210_GPB(6), S3C_GPIO_PULL_UP);}static inline void set_miso_as_input(void)//gpc0{gpio_direction_input(S5PV210_GPB(6));}static inline void set_cs_mosi_clk_as_output(void)//gpc1 2 3{gpio_direction_output(S5PV210_GPB(7),1);//MOSIgpio_direction_output(S5PV210_GPB(4),1);//clkgpio_direction_output(S5PV210_GPB(5),1);//cs}static inline void set_cs_mosi_clk_as_up(void)//gpc1 2 3{s3c_gpio_setpull(S5PV210_GPB(4), S3C_GPIO_PULL_UP);s3c_gpio_setpull(S5PV210_GPB(5), S3C_GPIO_PULL_UP);s3c_gpio_setpull(S5PV210_GPB(7), S3C_GPIO_PULL_UP);}static inline void set_gpcx_value(int pinx ,int v){gpio_set_value(S5PV210_GPB(pinx),v);}static inline int get_gpcx_value(int pinx){return( gpio_get_value(S5PV210_GPB(pinx)) );}//读12bitstatic unsigned int ads7846_Read_Data(void){ unsigned int i,temp=0x00; for(i=0;i<12;i++) { temp <<=1; set_gpcx_value(ADS7846_GPIO_CLK, 1); udelay(10); set_gpcx_value(ADS7846_GPIO_CLK, 0); udelay(10); if(get_gpcx_value(ADS7846_GPIO_MISO) != 0)temp++; } return (temp);}//写8bitstatic void ads7846_Write_Data(unsigned int n){ unsigned char i; set_gpcx_value(ADS7846_GPIO_CLK, 0); for(i=0;i<8;i++) { if((n&0x80)==0x80) set_gpcx_value(ADS7846_GPIO_MOSI, 1); else set_gpcx_value(ADS7846_GPIO_MOSI, 0); n <<= 1; set_gpcx_value(ADS7846_GPIO_CLK, 1); udelay(10); set_gpcx_value(ADS7846_GPIO_CLK, 0); udelay(10); }}//ADS7846转换==//保存在ts->buf 当中//ADS7846_CNV_NBR是值为8的宏，含义是AD转换次数。static void ads7846_conver_start(void){int i;unsigned int cmd[2];unsigned int data[2]; set_gpcx_value(ADS7846_GPIO_CS, 0); //开读cmd[0] = MEASURE_12BIT_X;//宏，本程序内定义cmd[1] = MEASURE_12BIT_Y;//宏，本程序内定义/* CS# Low */set_gpcx_value(ADS7846_GPIO_CS, 0);//连续转换for(ts->count=0; ts->count<ts->cnv_nbr;) { //分别读出x y坐标＝＝ for(i=0; i<2; i++){ ads7846_Write_Data(cmd[i]); udelay(40); data[i] = ads7846_Read_Data(); } //保存转换结果 ts->x_buf[ts->count]= data[0]; ts->y_buf[ts->count]= data[1]; ts->count++;}/* CS# High */set_gpcx_value(ADS7846_GPIO_CS, 1);}//-----------------------------------------------------------------------------//触摸屏数据滤波算法//触摸屏AD连续转换N次后，按升序排列，再取中间几位值求平均#define TS_AD_NBR_PJ4 //取中间4位求平均值 #define TS_AD_NBR_MAX_CZ10 //最大与最小的差值static inline bool touch_ad_data_filter(unsigned int *buf0, unsigned int *buf1){ unsigned int i,j,k,temp,temp1,nbr=(ADS7846_CNV_NBR); //将转换结果升序排列 //buf0 for (j= 0; j< nbr; j++) {for (i = 0; i < nbr; i++) { if(buf0[i]>buf0[i+1])//升序排列{temp=buf0[i+1];buf0[i+1]=buf0[i];buf0[i]=temp;} } } //buf1 for (j= 0; j< nbr; j++) {for (i = 0; i < nbr; i++) { if(buf1[i]>buf1[i+1])//升序排列{temp=buf1[i+1];buf1[i+1]=buf1[i];buf1[i]=temp;} } } //取中间值求平均== k=((nbr-TS_AD_NBR_PJ)>>1); temp = 0;temp1 = 0; //检查值是否有效== if((buf0[k+TS_AD_NBR_PJ-1]-buf0[k]>TS_AD_NBR_MAX_CZ)||(buf1[k+TS_AD_NBR_PJ-1]-buf1[k]>TS_AD_NBR_MAX_CZ)) //无效值 { return 0; } //-- //将中间指定位数累加 for(i=0;i<TS_AD_NBR_PJ;i++) { temp += buf0[k+i]; temp1 += buf1[k+i]; } //求平均值,将结果保存在最低位 buf0[0]=temp/TS_AD_NBR_PJ; buf1[0] = temp1/TS_AD_NBR_PJ; //-- return 1; }static inline bool get_down(void)//获取中断口电平状态{return (gpio_get_value (S5PV210_GPH0(7))); // 中断管脚电平状态}/*=========================================================================================== touch_timer_get_value这个函数的调用： 1、 触摸笔开始点击的时候， 在中断函数touch_down里面被调用，不是直接调用，而是设置定时器超时后调用 这样是为了去抖动 2、 touch_timer_get_value被调用一次后，如果pendown信号有效，则touch_timer_get_value会被持续调用 也是通过定时器实现的 touch_timer_get_value这个函数的功能： 启动7846转换，直到连续转换8次后，再滤波处理，获得有效值，并向上报告触摸屏事件============================================================================================*/static void touch_timer_get_value(unsigned long data); static DEFINE_TIMER(touch_timer, touch_timer_get_value, 0, 0);static void touch_timer_get_value(unsigned long data) {int pendown;//printk("touch_timer_get_value\n"); pendown = get_down();if(!pendown)//检测按下状态{ //关中断=== disable_irq(IRQ_EINT7); //启动ADS7846转换== ads7846_conver_start();//开中断== enable_irq(IRQ_EINT7);if(touch_ad_data_filter(ts->x_buf,ts->y_buf)) // 滤波函数处理 { ts->xp = ts->x_buf[0];ts->yp = ts->y_buf[0];printk("ts->xp = %d,ts->yp = %d\n",ts->xp,ts->yp);//--------------------------------------------------------------------absX = ts->xp ;absY = ts->yp ;input_report_abs(OFN_dev, ABS_X, absX);//X轴坐标input_report_abs(OFN_dev, ABS_Y, absY);//Y轴坐标input_report_key(OFN_dev, BTN_TOUCH, 1);//按下 按键input_report_abs(OFN_dev, ABS_PRESSURE, 1);//按下 压力input_sync(OFN_dev);//事件同步input_report_key(OFN_dev, BTN_TOUCH, 0);//抬起 按键值input_report_abs(OFN_dev, ABS_PRESSURE, 0);//抬起 压力值input_sync(OFN_dev);//-------------------------------------------------------------------- } mod_timer(&touch_timer, jiffies + 2); //重新设置系统定时器，超时后，又会调用touch_timer_get_value //jiffies变量记录了系统启动以来，系统定时器已经触发的次数。内核每秒钟将jiffies变量增加HZ次。 //因此，对于HZ值为100的系统，1个jiffy等于10ms，而对于HZ为1000的系统，1个jiffy仅为1ms //这里系统配置提HZ是100} else{/*ads7846_conver_start();if(touch_ad_data_filter(ts->x_buf,ts->y_buf)) // 滤波函数处理{ts->xp = ts->x_buf[0];ts->yp = ts->y_buf[0];printk("ts->xp = %d,ts->yp = %d\n",ts->xp,ts->yp);//--------------------------------------------------------------------absX = ts->xp ;absY = ts->yp ;input_report_abs(OFN_dev, ABS_X, absX);//X轴坐标input_report_abs(OFN_dev, ABS_Y, absY);//Y轴坐标input_report_key(OFN_dev, BTN_TOUCH, 0);//抬起 按键值input_report_abs(OFN_dev, ABS_PRESSURE, 0);//抬起 压力值input_sync(OFN_dev);//--------------------------------------------------------------------}*/}}static irqreturn_t touch_down(int irqno, void *param)//中断处理函数{ printk("Touch down -- Enter Interrupt 0 ！\n"); //稍后调用touch_timer_get_value，去抖动mod_timer(&touch_timer, jiffies + 15); //等ADS7846转换完成了再读 //同时还可以防抖动，如果定时器没有超时的这段时间里，//发生了抬起和按下中断，则定时器的值会被重设，不会超时 //内核配置时HZ值设为100，即1个jiffy等于10ms，//touch_timer_get_value(1); //直接调用会有抖动return IRQ_RETVAL(IRQ_HANDLED);}//-------------------------------------------static int __init ads7846_ts_init(void){ printk( KERN_INFO "Enter mini210 ads7846 Touchscreen driver\n" ); int ret = 0; printk("ads7846_ts_probe start!\n"); //给ads7846_ts_info指针分配内存== ts = kzalloc(sizeof(struct ads7846_ts_info), GFP_KERNEL); ts->cnv_nbr = ADS7846_CNV_NBR; ts->xp = 0; ts->yp = 0; ts->count = 0; //申请中断== s3c_gpio_setpull(S5PV210_GPH0(7), S3C_GPIO_PULL_UP); gpio_direction_input(S5PV210_GPH0(7)); s3c_gpio_cfgpin(S5PV210_GPH0(7), S3C_GPIO_SFN(0xf0000000));//设置为外部中断 eint0 ，参考GP0CON【】 set_irq_type(IRQ_EINT7, IRQ_TYPE_EDGE_FALLING);//-------------------------------------------------------------------------OFN_dev = input_allocate_device();// 申请一个输入设备if (!OFN_dev) return -ENOMEM;OFN_dev->name = "TouchScreen Pipe";// 触摸屏设备属性信息OFN_dev->phys = "input(ts)";OFN_dev->id.bustype = BUS_RS232;OFN_dev->id.vendor = 0xDEAD;OFN_dev->id.product = 0xBEEF;OFN_dev->id.version = 0x0101;input_set_abs_params(OFN_dev, ABS_X, 0, 4000, 0, 0);// input_set_abs_params(OFN_dev, ABS_Y, 0, 4000, 0, 0);// input_set_abs_params(OFN_dev, ABS_PRESSURE, 0, 1, 0, 0);// 压力OFN_dev->evbit[0] = BIT_MASK(EV_SYN) | BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);OFN_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);//---------------------------------------------------------------------------ret = request_irq(IRQ_EINT7, touch_down,IRQ_TYPE_EDGE_BOTH, "ads7864_touch", ts);if (ret != 0) {printk("ads7846_ts.c: Could not allocate ts IRQ_EINT !\n");ret = -EIO;goto fail;}//--------------------------------------------------------------------------------ret = input_register_device(OFN_dev);if(ret){free_irq(IRQ_EINT7, OFN_dev);input_free_device(OFN_dev);return -1;}//--------------------------------------------------------------------------------//初始化GPIO==set_miso_as_up(); set_miso_as_input(); set_cs_mosi_clk_as_up();set_cs_mosi_clk_as_output(); set_gpcx_value(ADS7846_GPIO_MOSI ,1);set_gpcx_value(ADS7846_GPIO_CS ,1);set_gpcx_value(ADS7846_GPIO_CLK ,1);//--printk("ads7846_ts_probe end!\n"); return 0;fail:disable_irq(IRQ_EINT7); free_irq(IRQ_EINT7, ts);return ret; }static void __exit ads7846_ts_exit(void){printk("Exit mini210 ads7846 Touchscreen driver\n");printk(KERN_INFO "ads7846_ts_remove() of TS called !\n"); disable_irq(IRQ_EINT7); free_irq(IRQ_EINT7, ts);}module_init(ads7846_ts_init);module_exit(ads7846_ts_exit);MODULE_AUTHOR("LIGHT");MODULE_LICENSE("GPL");
转载自：http://blog.csdn.net/bmbm546/article/details/7024147
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