嵌入式实验-简易计算器

嵌入式课程设计

课设题目

简易计算器（3）

一用S3CEV40试验箱上小键盘和LCD屏，设计一个简易计算器，键盘布局如图所示

二要求：

1. 计算过程中的所有按键操作都在超级终端上显示出来

2. 按下“＝”键后，该键位不显示，但应将完整的算式显示出来

3. 只考虑二元运算

4. 对于按键错误的情况，请自行处理

三主程序：

/*--- include files ---*/

#include "def.h"

#include "44b.h"

#include "44blib.h"

#include "lcd.h"

/*--- extern variables ---*/

extern INT8U g_auc_Ascii8x16[];

/* keyboard control address */

volatile UCHAR *keyboard_base = (UCHAR *)0x06000000;

/*--- global variable ---*/

char str[100];

int m;

char *p;

/*--- function declare ---*/

void init_keyboard();

void KeyboardInt(void) __attribute__ ((interrupt ("IRQ")));

void Lcd_Init(void);

void Lcd_Test(void);

void Lcd_Clr(void);

Main()

{

Lcd_Init();

init_keyboard();

Uart_Printf("\nPlease press one key on keyboard and look at LED ...\n");

}

void init_keyboard()

{

/* enable interrupt */

rINTMOD = 0x0;

rINTCON = 0x1;

/* set EINT1 interrupt handler */

rINTMSK =~(BIT_GLOBAL|BIT_EINT1);

pISR_EINT1 = (int)KeyboardInt;

/* PORT G */

rPCONG = 0xffff; // EINT7~0

rPUPG = 0x0; // pull up enable

rEXTINT = rEXTINT|0x20; // EINT1 falling edge mode rEXTINTPND = 0xf; // clear EXTINTPND

}

void KeyboardInt(void)

{

int value;

int i;

char x[100],y[100],z[100];

char c;

rI_ISPC = BIT_EINT1; // clear pending bit

value = key_read();

Uart_Printf("%x",value);

str[m++] = (char)value;

if( str!=null)

{

n = 0;

if(str[n]!='=')

{

if(str[n]!='+'|str[n]!='-'|str[n]!='*'|str[n]!='÷')

{

for(i=0;i

x[i]=str[i]

for(j=n+1;j<=m;j++)

y[j]=str[j];

c = str[n];

switch(c)

{

case '+' : z = x+y; break;

case '-' : z = x-y; break;

case '*' : z = x*y; break;

case '÷' : z = x÷y; break;

}

}

P = str;

Lcd_Test();

}

else

n++;

}

}

inline int key_read()

{

int value;

char temp;

/* read line 1 */

temp = *(keyboard_base+0xfd);

/* not 0xF mean key down */

if(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK)

{

if( (temp&0x1) == 0 )

value = 3;

else if( (temp&0x2) == 0 )

value = 2;

else if( (temp&0x4) == 0 )

value = 1;

else if( (temp&0x8) == 0 )

value = 0;

while(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK) // release

temp = *(keyboard_base+0xfb);

return value;

}

/* read line 2 */

temp = *(keyboard_base+0xfb);

/* not 0xF mean key down */

if(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK)

{

if( (temp&0x1) == 0 )

value = '=';

else if( (temp&0x2) == 0 )

value = 6;

else if( (temp&0x4) == 0 )

value = 5;

else if( (temp&0x8) == 0 )

value = 4;

while(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK) // release temp = *(keyboard_base+0xfb);

return value;

}

/* read line 3 */

temp = *(keyboard_base+0xf7);

/* not 0xF mean key down */

if(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK)

{

if( (temp&0x1) == 0 )

value = '=';

else if( (temp&0x2) == 0 )

value = 9;

else if( (temp&0x4) == 0 )

value = 8;

else if( (temp&0x8) == 0 )

value = 7;

while(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK) // release temp = *(keyboard_base+0xfb);

return value;

}

/* read line 4 */

temp = *(keyboard_base+0xef);

/* not 0xF mean key down */

if(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK)

{

if( (temp&0x1) == 0 )

value = '÷';

else if( (temp&0x2) == 0 )

value = '*';

else if( (temp&0x4) == 0 )

value = '-';

else if( (temp&0x8) == 0 )

value = '+';

while(( temp & KEY_V ALUE_MASK) != KEY_V ALUE_MASK) // release

temp = *(keyboard_base+0xfb);

return value;

}

return -1;

}

void Lcd_Init(void)

{

rDITHMODE=0x1223a;

rDP1_2 =0x5a5a;

rDP4_7 =0x366cd9b;

rDP3_5 =0xda5a7;

rDP2_3 =0xad7;

rDP5_7 =0xfeda5b7;

rDP3_4 =0xebd7;

rDP4_5 =0xebfd7;

rDP6_7 =0x7efdfbf;

rLCDCON1=(0)|(1<<5)|(MV AL_USED<<7)|(0x0<<8)|(0x0<<10)|(CLKVAL_GREY16<<12 );

rLCDCON2=(LINEV AL)|(HOZV AL<<10)|(10<<21);

rLCDSADDR1= (0x2<<27) | ( ((LCD_ACTIVE_BUFFER>>22)<<21 ) | M5D(LCD_ACTIVE_BUFFER>>1));

rLCDSADDR2= M5D(((LCD_ACTIVE_BUFFER+(SCR_XSIZE*LCD_YSIZE/2))>>1)) | (MV AL<<21);

rLCDSADDR3= (LCD_XSIZE/4) | ( ((SCR_XSIZE-LCD_XSIZE)/4)<<9 );

// enable,4B_SNGL_SCAN,WDL Y=8clk,WLH=8clk,

rLCDCON1=(1)|(1<<5)|(MV AL_USED<<7)|(0x3<<8)|(0x3<<10)|(CLKVAL_GREY16<<12 );

rBLUELUT=0xfa40;

//Enable LCD Logic and EL back-light.

rPDATE=rPDATE&0x0e;

}

void Lcd_Draw_Box(INT16 usLeft, INT16 usTop, INT16 usRight, INT16 usBottom, INT8U ucColor)

{

Lcd_Draw_HLine(usLeft, usRight, usTop, ucColor, 1);

Lcd_Draw_HLine(usLeft, usRight, usBottom, ucColor, 1);

Lcd_Draw_VLine(usTop, usBottom, usLeft, ucColor, 1);

Lcd_Draw_VLine(usTop, usBottom, usRight, ucColor, 1);

}

void Lcd_DspAscII8x16(INT16U x0, INT16U y0, INT8U ForeColor, INT8U * s) {

INT16 i,j,k,x,y,xx;

INT8U qm;

INT32U ulOffset;

INT8 ywbuf[16],temp[2];

for( i = 0; i < strlen((const char*)s); i++ )

{

if( (INT8U)*(s+i) >= 161 )

{

temp[0] = *(s + i);

temp[1] = '\0';

return;

}

else

{

qm = *(s+i);

ulOffset = (INT32U)(qm) * 16; //Here to be changed tomorrow

for( j = 0; j < 16; j ++ )

{

ywbuf[j] = g_auc_Ascii8x16[ulOffset + j];

}

for( y = 0; y < 16; y++ )

{

for( x = 0; x < 8; x++ )

{

k = x % 8;

if( ywbuf[y] & (0x80 >> k) )

{

xx = x0 + x + i*8;

LCD_PutPixel(xx, y + y0, (INT8U)ForeColor);

}

}

}

}

}

}

void Lcd_Clr(void)

{

INT32U i;

INT32U *pDisp = (INT32U *)LCD_VIRTUAL_BUFFER;

for( i = 0; i < (SCR_XSIZE*SCR_YSIZE/2/4); i++ )

{

*pDisp++ = WHITE;

}

}

void Lcd_Test(void)

{

/* initial LCD controller */

Lcd_Init();

/* clear screen */

Lcd_Clr();

/* draw rectangle pattern */

#ifdef Eng_v // english version

Lcd_DspAscII8x16(10,0,DARKGRAY,"Embest S3CEV40 ");

#else

Lcd_DspAscII8x16(10, 10,DARKGRAY," jian yi ji suan qi ")

#endif

Lcd_Draw_Box(10,40,310,60,14);

Lcd_DspAscII8x16(20, 50, BLACK, *p)

}

四课设总结

这次课设没有在老师的指导下完成，在做的当中解遇到了不小的麻烦，但经过多方面的查阅资料，最终完成了。这次课设综合了几乎一学期所学的知识，使我对嵌入式有了一个系统的了解，但嵌入式里面所含盖的岂止这一点，可能已后再也不会接触到嵌入式，但我相信通过对嵌入式的学习，可能会对我学习其他方面的知识有所帮助。