触摸屏驱动求助

发布于 2014-03-08 14:20:15 浏览：3316 订阅该版

在红龙103的板子上移植了RTT和RTGUI，都已经成功了，现在想加上触摸屏驱动跑一下DEMO，移植完以后，发现每次触摸无论什么地方都是打印
touch up: (0, 0)
屏上没有反应，还是DEMO的首页。

代码如下，希望能得到帮助，谢谢！

```#include <stdbool.h>
#include "stm32f10x.h"

#include "board.h"
#include "touch.h"

#include <rtthread.h>
#include <rtgui/event.h>
#include <rtgui/kbddef.h>
#include <rtgui/rtgui_server.h>
#include <rtgui/rtgui_system.h>

/*
MISO PB14
MOSI PB15
CLK  PB13
CS   PB12
INT  PG7
*/

#define   CS_0()          GPIO_ResetBits(GPIOB,GPIO_Pin_12)
#define   CS_1()          GPIO_SetBits(GPIOB,GPIO_Pin_12)

/*
7  6 - 4  3      2     1-0
s  A2-A0 MODE SER/DFR PD1-PD0
*/
//#define TOUCH_MSR_Y  0x90   //读X轴坐标指令 addr:1
//#define TOUCH_MSR_X  0xD0   //读Y轴坐标指令 addr:3

#define TOUCH_MSR_Y  0xD0   //读X轴坐标指令 addr:1
#define TOUCH_MSR_X  0x90   //读Y轴坐标指令 addr:3

struct rtgui_touch_device
{
    struct rt_device parent;

rt_timer_t poll_timer;
    rt_uint16_t x, y;

rt_bool_t calibrating;
    rt_touch_calibration_func_t calibration_func;

rt_uint16_t min_x, max_x;
    rt_uint16_t min_y, max_y;
};
static struct rtgui_touch_device *touch = RT_NULL;

extern unsigned char SPI_WriteByte(unsigned char data);
rt_inline void EXTI_Enable(rt_uint32_t enable);

struct rt_semaphore spi2_lock;

void rt_hw_spi2_baud_rate(uint16_t SPI_BaudRatePrescaler)
{
    SPI2->CR1 &= ~SPI_BaudRatePrescaler_256;
    SPI2->CR1 |= SPI_BaudRatePrescaler;
}

uint8_t SPI_WriteByte(unsigned char data)
{
    //Wait until the transmit buffer is empty
    while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_TXE) == RESET);
    // Send the byte
    SPI_I2S_SendData(SPI2, data);

//Wait until a data is received
    while (SPI_I2S_GetFlagStatus(SPI2, SPI_I2S_FLAG_RXNE) == RESET);
    // Get the received data
    data = SPI_I2S_ReceiveData(SPI2);

// Return the shifted data
    return data;
}

//SPI写数据
static void WriteDataTo7843(unsigned char num)
{
    SPI_WriteByte(num);
}

#define X_WIDTH 800
#define Y_WIDTH 480

static void rtgui_touch_calculate()
{

rt_kprintf("cal
");
	
    if (touch != RT_NULL)
    {
        rt_sem_take(&spi2_lock, RT_WAITING_FOREVER);
        /* SPI1 configure */
        rt_hw_spi2_baud_rate(SPI_BaudRatePrescaler_64);/* 72M/64=1.125M */

//读取触摸值
        {
            rt_uint16_t tmpx[10];
            rt_uint16_t tmpy[10];
            unsigned int i;

/* From the datasheet:
             * When the very first CLK after the control byte comes in, the
             * DOUT of ADS7843 is not valid. So we could only get 7bits from
             * the first SPI_WriteByte. And the got the following 5 bits from
             * another SPI_WriteByte.(aligned MSB)
             */
            for(i=0; i<10; i++)
            {
                CS_0();
                WriteDataTo7843(TOUCH_MSR_X);
                tmpx* = (SPI_WriteByte(0x00) & 0x7F) << 5;
                tmpx* |= (SPI_WriteByte(TOUCH_MSR_Y) >> 3) & 0x1F;

tmpy* = (SPI_WriteByte(0x00) & 0x7F) << 5;
                tmpy* |= (SPI_WriteByte(0x00) >> 3) & 0x1F;

WriteDataTo7843( 1<<7 ); /* 打开中断 */
                CS_1();
            }

//去最高值与最低值,再取平均值
            {
                rt_uint32_t min_x = 0xFFFF,min_y = 0xFFFF;
                rt_uint32_t max_x = 0,max_y = 0;
                rt_uint32_t total_x = 0;
                rt_uint32_t total_y = 0;
                unsigned int i;

for(i=0;i<10;i++)
                {
                    if( tmpx* < min_x )
                    {
                        min_x = tmpx*;
                    }
                    if( tmpx* > max_x )
                    {
                        max_x = tmpx*;
                    }
                    total_x += tmpx*;

if( tmpy* < min_y )
                    {
                        min_y = tmpy*;
                    }
                    if( tmpy* > max_y )
                    {
                        max_y = tmpy*;
                    }
                    total_y += tmpy*;
                }
                total_x = total_x - min_x - max_x;
                total_y = total_y - min_y - max_y;
                touch->x = total_x / 8;
                touch->y = total_y / 8;
            }//去最高值与最低值,再取平均值
        }//读取触摸值

rt_sem_release(&spi2_lock);

/* if it's not in calibration status  */
        if (touch->calibrating != RT_TRUE)
        {
            if (touch->max_x > touch->min_x)
            {
                touch->x = (touch->x - touch->min_x) * X_WIDTH/(touch->max_x - touch->min_x);
            }
            else if (touch->max_x < touch->min_x)
            {
                touch->x = (touch->min_x - touch->x) * X_WIDTH/(touch->min_x - touch->max_x);
            }

if (touch->max_y > touch->min_y)
            {
                touch->y = (touch->y - touch->min_y) * Y_WIDTH /(touch->max_y - touch->min_y);
            }
            else if (touch->max_y < touch->min_y)
            {
                touch->y = (touch->min_y - touch->y) * Y_WIDTH /(touch->min_y - touch->max_y);
            }

// normalize the data
            if (touch->x & 0x8000)
                touch->x = 0;
            else if (touch->x > X_WIDTH)
                touch->x = X_WIDTH - 1;

if (touch->y & 0x8000)
                touch->y = 0;
            else if (touch->y > Y_WIDTH)
                touch->y = Y_WIDTH - 1;
        }
    }
}

void touch_timeout(void* parameter)
{
    static unsigned int touched_down = 0;
    struct rtgui_event_mouse emouse;
    static struct _touch_previous
    {
        rt_uint32_t x;
        rt_uint32_t y;
    } touch_previous;

//rt_kprintf("ccc
");

/* touch time is too short and we lost the position already. */
    if ((!touched_down) && GPIO_ReadInputDataBit(GPIOG, GPIO_Pin_7) != 0)
        return;

if (GPIO_ReadInputDataBit(GPIOG,GPIO_Pin_7) != 0)
    {

//rt_kprintf("ddd
");

int tmer = RT_TICK_PER_SECOND/8 ;
        EXTI_Enable(1);
        emouse.parent.type = RTGUI_EVENT_MOUSE_BUTTON;
        emouse.button = (RTGUI_MOUSE_BUTTON_LEFT |RTGUI_MOUSE_BUTTON_UP);

/* use old value */
        emouse.x = touch->x;
        emouse.y = touch->y;

/* stop timer */
        rt_timer_stop(touch->poll_timer);
        rt_kprintf("touch up: (%d, %d)
", emouse.x, emouse.y);
        touched_down = 0;

if ((touch->calibrating == RT_TRUE) && (touch->calibration_func != RT_NULL))
        {
            /* callback function */
            touch->calibration_func(emouse.x, emouse.y);
        }
        rt_timer_control(touch->poll_timer , RT_TIMER_CTRL_SET_TIME , &tmer);
    }
    else
    {
        if(touched_down == 0)
        {
            int tmer = RT_TICK_PER_SECOND/20 ;
            /* calculation */
            rtgui_touch_calculate();

/* send mouse event */
            emouse.parent.type = RTGUI_EVENT_MOUSE_BUTTON;
            emouse.parent.sender = RT_NULL;

emouse.x = touch->x;
            emouse.y = touch->y;

touch_previous.x = touch->x;
            touch_previous.y = touch->y;

/* init mouse button */
            emouse.button = (RTGUI_MOUSE_BUTTON_LEFT |RTGUI_MOUSE_BUTTON_DOWN);

//            rt_kprintf("touch down: (%d, %d)
", emouse.x, emouse.y);
            touched_down = 1;
            rt_timer_control(touch->poll_timer , RT_TIMER_CTRL_SET_TIME , &tmer);
        }
        else
        {
            /* calculation */
            rtgui_touch_calculate();

#define previous_keep      8
            //判断移动距离是否小于previous_keep,减少误动作.
            if(
                (touch_previous.x<touch->x+previous_keep)
                && (touch_previous.x>touch->x-previous_keep)
                && (touch_previous.y<touch->y+previous_keep)
                && (touch_previous.y>touch->y-previous_keep)  )
            {
                return;
            }

touch_previous.x = touch->x;
            touch_previous.y = touch->y;

/* send mouse event */
            emouse.parent.type = RTGUI_EVENT_MOUSE_BUTTON ;
            emouse.parent.sender = RT_NULL;

emouse.x = touch->x;
            emouse.y = touch->y;

/* init mouse button */
            emouse.button = (RTGUI_MOUSE_BUTTON_RIGHT |RTGUI_MOUSE_BUTTON_DOWN);
//            rt_kprintf("touch motion: (%d, %d)
", emouse.x, emouse.y);
        }
    }

/* send event to server */
    if (touch->calibrating != RT_TRUE)
        rtgui_server_post_event(&emouse.parent, sizeof(struct rtgui_event_mouse));
}

static void NVIC_Configuration(void)
{
    NVIC_InitTypeDef NVIC_InitStructure;

/* Enable the EXTI0 Interrupt */
    NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

rt_inline void EXTI_Enable(rt_uint32_t enable)
{
    EXTI_InitTypeDef EXTI_InitStructure;

/* Configure  EXTI  */
    EXTI_InitStructure.EXTI_Line = EXTI_Line7;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;//Falling下降沿 Rising上升

if (enable)
    {
        /* enable */
        EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    }
    else
    {
        /* disable */
        EXTI_InitStructure.EXTI_LineCmd = DISABLE;
    }

EXTI_Init(&EXTI_InitStructure);
    EXTI_ClearITPendingBit(EXTI_Line7);
}

static void EXTI_Configuration(void)
{
    /* PB1 touch INT */
    {
        GPIO_InitTypeDef GPIO_InitStructure;
        RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOG,ENABLE);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
        GPIO_Init(GPIOG,&GPIO_InitStructure);
    }

GPIO_EXTILineConfig(GPIO_PortSourceGPIOG, GPIO_PinSource7);

/* Configure  EXTI  */
    EXTI_Enable(1);
}

/* RT-Thread Device Interface */
static rt_err_t rtgui_touch_init (rt_device_t dev)
{
    NVIC_Configuration();
    EXTI_Configuration();

/* PC4 touch CS */
    {
        GPIO_InitTypeDef GPIO_InitStructure;
		
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB , ENABLE );       
	
       GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_InitStructure.GPIO_Pin   = GPIO_Pin_12;
        GPIO_Init(GPIOB,&GPIO_InitStructure);
        CS_1();
    }

/*预先设定好校准值，如果需要再次矫正的话，需要认为调用校正函数*/
	touch->min_x=171;
	touch->max_x=3635;
	touch->min_y=213;
	touch->max_y=3861;
	touch->calibrating = RT_FALSE;//跳过校准

CS_0();
    WriteDataTo7843( 1<<7 ); /* 打开中断 */
    CS_1();

return RT_EOK;
}

static rt_err_t rtgui_touch_control (rt_device_t dev, rt_uint8_t cmd, void *args)
{
    switch (cmd)
    {
    case RT_TOUCH_CALIBRATION:
        touch->calibrating = RT_TRUE;
        touch->calibration_func = (rt_touch_calibration_func_t)args;
        break;

case RT_TOUCH_NORMAL:
        touch->calibrating = RT_FALSE;
        break;

case RT_TOUCH_CALIBRATION_DATA:
    {
        struct calibration_data* data;

data = (struct calibration_data*) args;

//update
        touch->min_x = data->min_x;
        touch->max_x = data->max_x;
        touch->min_y = data->min_y;
        touch->max_y = data->max_y;
    }
    break;
    }

return RT_EOK;
}

void EXTI9_5_IRQHandler(void)
{
	rt_kprintf("bbb
");

/* disable interrupt */
    EXTI_Enable(0);

/* start timer */
    rt_timer_start(touch->poll_timer);

EXTI_ClearITPendingBit(EXTI_Line7);
}

void rtgui_touch_hw_init(void)
{
    /* SPI1 config */
    {
        GPIO_InitTypeDef GPIO_InitStructure;
        SPI_InitTypeDef SPI_InitStructure;

rt_kprintf("aaa
");

/* Enable SPI1 Periph clock */
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOG | RCC_APB2Periph_AFIO , ENABLE ); 
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2 , ENABLE );

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //通用推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB,&GPIO_InitStructure);

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_14;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;  //上拉输入
	GPIO_Init(GPIOB,&GPIO_InitStructure);

/*
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; 	//通用推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; 
	GPIO_Init(GPIOB,&GPIO_InitStructure);

//Configure PG7 pin: TP_INT pin 
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; 
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; 	//上拉输入
	GPIO_Init(GPIOG,&GPIO_InitStructure);
*/
	
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;  //设置SPI单向或者双向的数据模式:SPI设置为双线双向全双工
	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;		//设置SPI工作模式:设置为主SPI
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;		//设置SPI的数据大小:SPI发送接收8位帧结构
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;		
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;	
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;		//NSS信号由硬件（NSS管脚）还是软件（使用SSI位）管理:内部NSS信号有SSI位控制
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;		
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;	//指定数据传输从MSB位还是LSB位开始:数据传输从MSB位开始
	SPI_InitStructure.SPI_CRCPolynomial = 7;	//CRC值计算的多项式

SPI_I2S_DeInit(SPI2);
        SPI_Init(SPI2, &SPI_InitStructure);

/* Enable SPI_MASTER */
        SPI_Cmd(SPI2, ENABLE);
        SPI_CalculateCRC(SPI2, DISABLE);

if (rt_sem_init(&spi2_lock, "spi2lock", 1, RT_IPC_FLAG_FIFO) != RT_EOK)
        {
            rt_kprintf("init spi2 lock semaphore failed
");
        }
    } /* SPI1 config */

touch = (struct rtgui_touch_device*)rt_malloc (sizeof(struct rtgui_touch_device));
    if (touch == RT_NULL) return; /* no memory yet */

/* clear device structure */
    rt_memset(&(touch->parent), 0, sizeof(struct rt_device));
    touch->calibrating = false;

/* init device structure */
    touch->parent.type = RT_Device_Class_Unknown;
    touch->parent.init = rtgui_touch_init;
    touch->parent.control = rtgui_touch_control;
    touch->parent.user_data = RT_NULL;

/* create 1/8 second timer */
    touch->poll_timer = rt_timer_create("touch", touch_timeout, RT_NULL,
                                        RT_TICK_PER_SECOND/8, RT_TIMER_FLAG_PERIODIC);

/* register touch device to RT-Thread */
    rt_device_register(&(touch->parent), "touch", RT_DEVICE_FLAG_RDWR);
}

#ifdef RT_USING_FINSH
#include <finsh.h>

void touch_t( rt_uint16_t x , rt_uint16_t y )
{
    struct rtgui_event_mouse emouse ;
    emouse.parent.type = RTGUI_EVENT_MOUSE_BUTTON;
    emouse.parent.sender = RT_NULL;

emouse.x = x ;
    emouse.y = y ;
    /* init mouse button */
    emouse.button = (RTGUI_MOUSE_BUTTON_LEFT |RTGUI_MOUSE_BUTTON_DOWN );
    rtgui_server_post_event(&emouse.parent, sizeof(struct rtgui_event_mouse));

rt_thread_delay(2) ;
    emouse.button = (RTGUI_MOUSE_BUTTON_LEFT |RTGUI_MOUSE_BUTTON_UP );
    rtgui_server_post_event(&emouse.parent, sizeof(struct rtgui_event_mouse));
}

FINSH_FUNCTION_EXPORT(touch_t, x & y ) ;
#endif
```