?? armjishu_touchscreen.c
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/******************** (C) COPYRIGHT 2009 www.armjishu.com ************************
* File Name : ARMJISHU_TouchScreen_ADS7843.c
* Author : www.armjishu.com Team
* Version : V3.0.1
* Date : 03/20/2010
* Description :
ADS7843_CS is PB1
ADS7843_INT is PC1
*******************************************************************************/
#include "ARMJISHU_TouchScreen.h"
#include "stm32f10x.h"
#include <stdio.h>
#include "stm32f10x_exti.h"
extern void LCD_SetPoint(uint8_t Xpos, uint16_t Ypos, uint16_t Color);
// A/D 通道選擇命令字和工作寄存器
#define CHX 0x90//0x90 //通道Y+的選擇控制字 //0x94
#define CHY 0xD0//0xd0 //通道X+的選擇控制字 //0xD4
//#define ADS7843_WrCmd SPI1_SendByte
//#define ADS7843_Read SPI1_RecvByte
void ADS7843_CS_config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIOB, GPIOC and AFIO clock */
RCC_APB2PeriphClockCmd(RCC_ADS7843_CS , ENABLE); //RCC_APB2Periph_AFIO
/* LEDs pins configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_ADS7843_CS;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIO_ADS7843_CS_PORT, &GPIO_InitStructure);
}
static void ADS7843_INT_config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable GPIOB, GPIOC and AFIO clock */
RCC_APB2PeriphClockCmd(RCC_ADS7843_INT , ENABLE); //RCC_APB2Periph_AFIO
/* LEDs pins configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_ADS7843_INT;
//GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(GPIO_ADS7843_INT_PORT, &GPIO_InitStructure);
}
static void ADS7843_INT_EXIT_Init(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
/* Connect Button EXTI Line to Button GPIO Pin */
GPIO_EXTILineConfig(GPIO_ADS7843_EXTI_PORT_SOURCE, GPIO_ADS7843_EXTI_PIN_SOURCE);
/* Configure Button EXTI line */
EXTI_InitStructure.EXTI_Line = GPIO_ADS7843_EXTI_LINE;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
}
/*******************************************************************************
* Function Name : InterruptConfig
* Description : Configures the used IRQ Channels and sets their priority.NVIC_Configuration
* Input : None
* Output : None
* Return : None
*******************************************************************************/
static void ADS7843_InterruptConfig(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Set the Vector Table base address at 0x08000000 */
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0000);
/* Configure the Priority Group to 2 bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
/* Enable the EXTI5 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = GPIO_ADS7843_EXTI_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
static void LCD_BIG_POINT(u16 xScreen, u16 yScreen)
{
LCD_SetPoint(xScreen, yScreen, 0xF81F);//Magenta
LCD_SetPoint(xScreen-1, yScreen, 0xF81F);
LCD_SetPoint(xScreen+1, yScreen, 0xF81F);
LCD_SetPoint(xScreen, yScreen-1, 0xF81F);
LCD_SetPoint(xScreen, yScreen+1, 0xF81F);
LCD_SetPoint(xScreen-1, yScreen-1, 0xF81F);
LCD_SetPoint(xScreen-1, yScreen+1, 0xF81F);
LCD_SetPoint(xScreen+1, yScreen-1, 0xF81F);
LCD_SetPoint(xScreen+1, yScreen+1, 0xF81F);
}
static void LCD_SMALL_POINT(u16 xScreen, u16 yScreen)
{
LCD_SetPoint(xScreen, yScreen, 0xF81F);//Magenta
LCD_SetPoint(xScreen-1, yScreen, 0xF81F);
LCD_SetPoint(xScreen-1, yScreen-1, 0xF81F);
LCD_SetPoint(xScreen, yScreen-1, 0xF81F);
}
/*=====================================================================*/
u16 _AD2Y(u16 adx) //240
{
u16 sx=0;
int r = adx - 200;
r *= 240;
sx=r / (4000 - 280);
if (sx<=0 || sx>240)
return 0;
return sx;
}
u16 _AD2X(u16 ady) //320
{
u16 sy=0;
int r = ady - 260;
r *= 320;
sy=r/(3960 - 360);
if (sy<=0 || sy>320)
return 0;
return sy;
}
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
// A/D 通道選擇命令字和工作寄存器
//#define CHX 0x90 //通道Y+的選擇控制字 //0x94
//#define CHY 0xd0 //通道X+的選擇控制字 //0xD4
//讀ADS7843的IO控制口
/*=====================================================================*/
void ADS7843_Init(void)
{
ADS7843_CS_config(); // 使能LCD
ADS7843_CS_HIGH() ; // 關閉LCD
SPI1_Config();
SPI1_Init_For_Byte();
SPI1_MOSI_HIGH();
SPI1_SCK_LOW();
ADS7843_INT_config();
#if 0
ADS7843_INT_EXIT_Init();
ADS7843_InterruptConfig();
#endif
}
/*=====================================================================*/
/*=====================================================================*/
void SPI1_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
// Set as Output push-pull - SCK and MOSI
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = SPI1_SCK | SPI1_MOSI;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(SPI1_PORT, &GPIO_InitStructure);
//SPI_MISO
GPIO_InitStructure.GPIO_Pin = SPI1_MISO;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(SPI1_PORT, &GPIO_InitStructure);
}
/*=====================================================================*/
void SPI1_Init_For_Byte(void)
{
}
/*=====================================================================*/
static void ADS7843_SPI_Start( void )
{
ADS7843_CS_HIGH();
SPI1_MOSI_HIGH();
SPI1_SCK_LOW();
ADS7843_CS_LOW(); //芯片允許
}
/*=====================================================================*/
static void SPI_MOSI(u8 data)
{
if(data)
SPI1_MOSI_HIGH();
else
SPI1_MOSI_LOW();
}
/*=====================================================================*/
/*
#define ShortDelayTime 1
#define LongDelayTime (ShortDelayTime*2)
SPI1_Delay_Short()
{
__IO uint32_t nCount;
for( nCount= 0; nCount < ShortDelayTime; nCount++ );
}
*/
/*=====================================================================*/
/*=====================================================================*/
static void ADS7843_WrCmd(u8 cmd)
{
u8 buf, i;
for( i = 0; i < 8; i++ )
{
buf = (cmd >> (7-i)) & 0x1 ; //MSB在前,LSB在后
SPI_MOSI(buf); //時鐘上升沿鎖存DIN
SPI1_SCK_HIGH(); //時鐘脈沖，一共8個
SPI1_SCK_LOW(); //開始發送命令字
}
}
/*=====================================================================*/
static u16 ADS7843_Read(void)
{
u16 buf = 0 ;
u8 i;
SPI1_SCK_HIGH(); //wait busy
SPI1_SCK_LOW();
for( i = 0; i < 12; i++ )
{
buf = buf << 1 ;
SPI1_SCK_HIGH();
if ( SPI1_MISO_READ() )
{
buf = buf + 1 ;
}
SPI1_SCK_LOW();
}
for( i = 0; i < 3; i++ )
{
SPI1_SCK_HIGH();
SPI1_SCK_LOW();
}
return( buf ) ;
}
/*=====================================================================*/
#define READ_TIMES 10
#define VALID_TIMES (((READ_TIMES-1)/2) -1)
static u8 ADS7843_Rd_Addata(u16 *X_Addata,u16 *Y_Addata)
{
u16 i,j,k,x_dataarray[READ_TIMES],y_dataarray[READ_TIMES];
for(i=0;(GPIO_ADS7843_INT_VALID)&&(i<READ_TIMES);i++) //采樣多次.
{
ADS7843_SPI_Start();
ADS7843_WrCmd( CHX ) ;
x_dataarray[i] = ADS7843_Read() ;
ADS7843_CS_HIGH();
ADS7843_SPI_Start();
ADS7843_WrCmd( CHY ) ;
y_dataarray[i] = ADS7843_Read() ;
ADS7843_CS_HIGH();
}
if(i == READ_TIMES) //一定要讀到times次數據,否則丟棄
{
// 濾波：排序后去掉最大值和最小值
for(i=0;i<READ_TIMES;i++)
{
for(j=READ_TIMES;j<READ_TIMES-1;j++)
{
if(x_dataarray[j] > x_dataarray[i])
{
k = x_dataarray[j];
x_dataarray[j] = x_dataarray[i];
x_dataarray[i] = k;
}
}
}
// 濾波：排序后去掉最大值和最小值
for(i=0;i<READ_TIMES;i++)
{
for(j=READ_TIMES;j<READ_TIMES-1;j++)
{
if(y_dataarray[j] > y_dataarray[i])
{
k = y_dataarray[j];
y_dataarray[j] = y_dataarray[i];
y_dataarray[i] = k;
}
}
}
// 濾波：去掉最大值和最小值
*X_Addata = (x_dataarray[VALID_TIMES] + x_dataarray[VALID_TIMES+1]
+ x_dataarray[VALID_TIMES+2] + x_dataarray[VALID_TIMES+3]) >> 2;
#ifdef SIZE_2_8INCH_TFT_LCD
*Y_Addata = 4095 - ((y_dataarray[VALID_TIMES] + y_dataarray[VALID_TIMES+1]
+ y_dataarray[VALID_TIMES+2] + y_dataarray[VALID_TIMES+3]) >> 2);
#else // SIZE_3_2INCH_TFT_LCD
*Y_Addata= (y_dataarray[VALID_TIMES] + y_dataarray[VALID_TIMES+1]
+ y_dataarray[VALID_TIMES+2] + y_dataarray[VALID_TIMES+3]) >> 2;
#endif
//printf("\n\r (0x%x, 0x%x), (%d, %d)", *X_Addata, *Y_Addata, *X_Addata, *Y_Addata);
return 1;
}
return 0;
}
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
u16 distence(u16 data1,u16 data2)
{
if((data2 > data1 + 2) || (data1 > data2 + 2))
{
return 0;
}
return 1;
}
/*=====================================================================*/
void ARMJISHU_TouchScreen(void)
{
u16 xdata, ydata;
u32 xScreen, yScreen;
static u16 sDataX,sDataY;
// printf("\n\r ARMJISHU_TouchScreen_ADS7843 \n\r");
if(!ADS7843_Rd_Addata(&xdata, &ydata))
{
return;
}
xScreen = _AD2X(xdata);
yScreen = _AD2Y(ydata);
//xScreen = 320 - ((ydata*320)>>12);
//yScreen = (xdata*240)>>12;
//printf("\n\r (0x%x, 0x%x), (%d, %d)", xdata, ydata, xScreen, yScreen);
if((xScreen>1)&&(yScreen>1)&&(xScreen<320-1)&&(yScreen<240-1))
{
//printf("\n\r%d,%d", xScreen, yScreen);
if((GPIO_ADS7843_INT_VALID) && distence(sDataX,xScreen) && distence(sDataY,yScreen))
{
//LCD_BIG_POINT(yScreen, xScreen);
LCD_SMALL_POINT(yScreen, xScreen);
}
sDataX = xScreen;
sDataY = yScreen;
}
}
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
/*=====================================================================*/
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