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rt-thread/bsp/stm32f10x/drivers/touch.c

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#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 PA6
MOSI PA7
CLK PA5
CS PC4
*/
#define CS_0() GPIO_ResetBits(GPIOC,GPIO_Pin_4)
#define CS_1() GPIO_SetBits(GPIOC,GPIO_Pin_4)
/*
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
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 spi1_lock;
void rt_hw_spi1_baud_rate(uint16_t SPI_BaudRatePrescaler)
{
SPI1->CR1 &= ~SPI_BaudRatePrescaler_256;
SPI1->CR1 |= SPI_BaudRatePrescaler;
}
uint8_t SPI_WriteByte(unsigned char data)
{
//Wait until the transmit buffer is empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);
// Send the byte
SPI_I2S_SendData(SPI1, data);
//Wait until a data is received
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);
// Get the received data
data = SPI_I2S_ReceiveData(SPI1);
// Return the shifted data
return data;
}
//SPI写数据
static void WriteDataTo7843(unsigned char num)
{
SPI_WriteByte(num);
}
#define X_WIDTH 240
#define Y_WIDTH 320
static void rtgui_touch_calculate()
{
if (touch != RT_NULL)
{
rt_sem_take(&spi1_lock, RT_WAITING_FOREVER);
/* SPI1 configure */
rt_hw_spi1_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[i] = (SPI_WriteByte(0x00) & 0x7F) << 5;
tmpx[i] |= (SPI_WriteByte(TOUCH_MSR_Y) >> 3) & 0x1F;
tmpy[i] = (SPI_WriteByte(0x00) & 0x7F) << 5;
tmpy[i] |= (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[i] < min_x )
{
min_x = tmpx[i];
}
if( tmpx[i] > max_x )
{
max_x = tmpx[i];
}
total_x += tmpx[i];
if( tmpy[i] < min_y )
{
min_y = tmpy[i];
}
if( tmpy[i] > max_y )
{
max_y = tmpy[i];
}
total_y += tmpy[i];
}
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(&spi1_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;
/* touch time is too short and we lost the position already. */
if ((!touched_down) && GPIO_ReadInputDataBit(GPIOB, GPIO_Pin_1) != 0)
return;
if (GPIO_ReadInputDataBit(GPIOB,GPIO_Pin_1) != 0)
{
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)\n", 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)\n", 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)\n", 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 = EXTI1_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_Line1;
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_Line1);
}
static void EXTI_Configuration(void)
{
/* PB1 touch INT */
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOB,&GPIO_InitStructure);
}
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);
/* 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_GPIOC,ENABLE);
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;
GPIO_Init(GPIOC,&GPIO_InitStructure);
CS_1();
}
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, int 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 EXTI1_IRQHandler(void)
{
/* disable interrupt */
EXTI_Enable(0);
/* start timer */
rt_timer_start(touch->poll_timer);
EXTI_ClearITPendingBit(EXTI_Line1);
}
void rtgui_touch_hw_init(void)
{
/* SPI1 config */
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
/* Enable SPI1 Periph clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA
| RCC_APB2Periph_AFIO | RCC_APB2Periph_SPI1,
ENABLE);
/* Configure SPI1 pins: PA5-SCK, PA6-MISO and PA7-MOSI */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/*------------------------ SPI1 configuration ------------------------*/
SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;//SPI_Direction_1Line_Tx;
SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;/* 72M/64=1.125M */
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_I2S_DeInit(SPI1);
SPI_Init(SPI1, &SPI_InitStructure);
/* Enable SPI_MASTER */
SPI_Cmd(SPI1, ENABLE);
SPI_CalculateCRC(SPI1, DISABLE);
if (rt_sem_init(&spi1_lock, "spi1lock", 1, RT_IPC_FLAG_FIFO) != RT_EOK)
{
rt_kprintf("init spi1 lock semaphore failed\n");
}
} /* 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
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