基于ARM触摸屏的实现

ucos II+ucGUI+s3c2410+LCD+触摸屏整合作者:佚名来源:不详录入:Admin更新时间：2008-8-18 14:57:54点击数：240【字体：】环境：ads2.2＋ARM9 ＋s3c2410注意：由于编译器（ads1.2或2.2）对全局变量初始化为0的不完全支持，有时必须手动初始化为0，切记！！！一、ucos II移植到ARM9 s3c2410可从官网下载移植代码，基本无需改动。

在os_cpu_a.s中的函数UCOS_IRQHandler中的bl OSIntEnter和bl C_IRQHandler之间插入如下代码（见邵贝贝，第2版，第104页的说明：L3.18(4)）：ldr r0, =OSIntNestingldrb r0,[r0]cmp r0,#1bne XXldr r0,=OSTCBCurldr r1,[r0]str sp,[r1] ; store sp in preempted tasks's TCBXX二、ucGui 390移植到ARM9 s3c24101. Lcd驱动：1）画点函数：对dm2410实验板上的lcd，左上为原点（0，0），函数如下：void LCD2410_SetPixel(int xp, int yp, U16 color, int dindex){*(pLCDBuffer565 + SCREEN_WIDTH*yp + xp) = color;}为了达到更快的显示速度，别忘了开启Cache！！！2）LCD控制器的初始化，对2410函数如下：int LCD2410_Init(void){if(!isLcdInit){InitLcdPort();InitLcdRegs();isLcdInit = 1;return 0;}return 1;}void InitLcdPort(void){// LCD port initialize.s2410IOP->GPCUP = 0xFFFFFFFF;s2410IOP->GPCCON = 0xAAAAAAAA;s2410IOP->GPDUP = 0xFFFFFFFF;s2410IOP->GPDCON = 0xAAAAAAAA;s2410IOP->GPGCON &= ~(3 << 8); /* Set LCD_PWREN as output */ s2410IOP->GPGCON |= (1 << 8);s2410IOP->GPGDAT |= (1 << 4); //* Backlight ONvoid InitLcdRegs(void){s2410LCD->LCDCON1 = (CLKVAL_TFT << 8) | //* VCLK = HCLK / ((CLKVAL + 1) * 2) -> About 7 Mhz(EACH_FRAME << 7) | //* 0 : Each Frame(3 << 5) | // TFT LCD Pannel(12 << 1) | //Y: // 16bpp Mode(0 << 0) ; // Disable LCD Outputs2410LCD->LCDCON2 = (VBPD <<24)| //*VBPD :((32-1)&0xff)=0x1f (LINEVAL_TFT << 14) | //* LINEVAL_TFT : 480 - 1 &bsp;(VFPD << 6) | //* VFPD : ((11-1)&0xff) = 0xa(VSPW << 0) ; //* VSPW : ((2-1) &0x3f) = 0x1 s2410LCD->LCDCON3 = (HBPD <<19)| //*HBPD : (88-1)&0x7f) (HOZVAL_TFT << 8) | //* HOZVAL_TFT : 800 - 1(HFPD << 0) ; //* HFPD : ((40-1)&0xff) s2410LCD->LCDCON4 = (MVAL << 8) | //* MVAL : 13 (HSPW <<0); //*HSPW : ((128-1)&0xff)&bsp;s2410LCD->LCDCON5 = (0 << 12) | // BPP24BL : LSB valid(1 << 11) | // FRM565 MODE : 5:5:5:1 Format(0 << 10) | // INVVCLK : VCLK Falling Edge(1 << 9) | // INVVLINE : Inverted Polarity(1 << 8) | // INVVFRAME : Inverted Polarity(0 << 7) | // INVVD : Normal(0 << 6) | // INVVDEN : Normal &bsp;(0 << 5) | // INVPWREN : Normal(0 << 4) | // INVENDLINE : Normal(1 << 3) | // PWREN : Disable PWREN(0 << 2) | // ENLEND : Disable LEND signal(0 << 1) | // BSWP : Swap Disable(1 << 0) ; // HWSWP : Swap Enables2410LCD->LCDSADDR1 = ((FRAMEBUF_DMA_BASE >> 22) << 21) |((M5D(FRAMEBUF_DMA_BASE >> 1)) << 0);s2410LCD->LCDSADDR2=M5D( (FRAMEBUF_DMA_BASE+(LCD_XSIZE_TFT*LCD _YSIZE_TFT*2))>>1 );s2410LCD->LCDSADDR3=(((LCD_XSIZE_TFT-LCD_XSIZE_TFT)/1)<<11)|(LCD_XSI ZE_TFT/1);s2410LCD->LCDINTMSK|=(3); // MASK LCD Sub Interrupts2410LCD->LPCSEL&=(~7); // Disable LPC3600s2410LCD->TPAL=0; // Disable Temp Palettes2410LCD->LCDCON1 |= 1;}其中，部分变量、常量定义如下：#define LCD_XSIZE_TFT (800)#define LCD_YSIZE_TFT (480)#define HOZVAL_TFT (LCD_XSIZE_TFT-1)#define LINEVAL_TFT (LCD_YSIZE_TFT-1)#define MVAL (13)#define MVAL_USED (1)#define EACH_FRAME (0)//STN/CSTN timing parameter for LCBHBT161M(NANYA)#define WLH (3)#define WDLY (3)#define LINEBLANK (1 &0xff)#define VBPD ((32-1)&0xff)#define VFPD ((11-1)&0xff)#define VSPW ((2-1) &0x3f)#define HBPD ((88-1)&0x7f)#define HFPD ((40-1)&0xff)#define HSPW ((128-1)&0xff)#define CLKVAL_TFT (0)#define M5D(n) ((n) & 0x1fffff)#define SCREEN_WIDTH 800 //800#define SCREEN_HEIGHT 480 //480#define FRAMEBUF_DMA_BASE (0x35000000)U16* pLCDBuffer565=(U16*)FRAMEBUF_DMA_BASE;3）填写配置文件LCDConf.h&nbs;#define LCD_XSIZE (800) /* X-resolution of LCD, Logical coor. */#define LCD_YSIZE (480) /* Y-resolution of LCD, Logical coor. */#define LCD_BITSPERPIXEL (16)#define LCD_CONTROLLER 1#define LCD_SWAP_RB_0 12．触摸屏驱动：触摸屏驱动计算出触摸屏的坐标（x，y），对dm2410实验板上的触摸屏，左下为原点，但不一定是（0，0）。

两个函数：1）设置中断向量，开中断：void SetTSInterrupt(void){rADCDLY = (50000);rADCCON = (1<<14)|(ADCPRS<<6)|(7<<3)|(0<<2)|(0<<1)|(0);rADCTSC = (0<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);pISR_ADC = (U32)TSIrqISR; //rINTMSK &= ~(BIT_ADC);rINTSUBMSK &= ~(BIT_SUB_TC);}2）中断处理函数：static void TSIrqISR(void){int i;U32 Pt[6];rINTSUBMSK |= (BIT_SUB_ADC|BIT_SUB_TC);if(rADCDAT0 & 0x8000){//抬起isDown = 0;rADCTSC &= 0xff; // Set stylus down interruptTX = -1;TY = -1; //抬起触笔时，TX,TY要值成不大于0的数}else //按下{ isDown = 1;rADCTSC=(0<<8)|(0<<7)|(0<<6)|(1<<5)|(1<<4)|(1<<3)|(0<<2)|(1);for(i=0;i<LOOP;i++); //delay to set up the next channelfor(i=0;i<5;i++) //5 times{rADCCON|=0x1; // Start X-position conversionwhile(rADCCON & 0x1); // Check if Enable_start is lowwhile(!(0x8000&rADCCON)); // Check ECFLG&nbs;Pt[i]=(0x3ff&rADCDAT0);}Pt[5]=(Pt[0]+Pt[1]+Pt[2]+Pt[3]+Pt[4])/5;//多次采样取平均值TX = Pt[5];rADCTSC=(0<<8)|(0<<7)|(1<<6)|(1<<5)|(0<<4)|(1<<3)|(0<<2)|(2);for(i=0;i<LOOP;i++); //delay to set up the next channelfor(i=0;i<5;i++) //5 times{rADCCON|=0x1; // Start Y-position conversionwhile(rADCCON & 0x1); // Check if Enable_start is lowwhile(!(0x8000&rADCCON)); // Check ECFLGPt[i]=(0x3ff&rADCDAT1);}Pt[5]=(Pt[0]+Pt[1]+Pt[2]+Pt[3]+Pt[4])/5;// 多次采样取平均值TY = Pt[5];rADCTSC=(1<<8)|(1<<7)|(1<<6)|(0<<5)|(1<<4)|(0<<3)|(0<<2)|(3);}//cprintf("%d,%d\n",TX,TY);OSMboxPost(TouchMbox, 0);//向处理触摸进程发消息rSUBSRCPND |= BIT_SUB_TC;rINTSUBMSK &= ~(BIT_SUB_TC); // Unmask sub interrupt (TC)ClearPending(BIT_ADC);}3）需要的量：#define LOOP 1#define ADCPRS 0x27int TX=0;//触摸坐标xint TY=0;//触摸坐标yextern OS_EVENT *TouchMbox;int isDown;4）触摸屏校准：Ucgui390中，带有一校准程序（于TOUCH_Calibrate.c中），可以改写为我所用（见下文）。