[嵌入式]2021-09-29

2021年9月29日，准备开始写博客。用来记录自己在嵌入式开发、C语言以及自己其他小项目的心得体会和知识点。
下面是直接在oled上面写的一个简单的计算器程序，有一些功能没写，以后尽量补充。
#include “calculator.h”
#include “delay.h”
#include “Display.h”
#include “math.h”
#include “key.h”

#define GET_ARRAY_LEN(array,len) {len = (sizeof(array) / sizeof(array[0]));}

u8 char_switch_flag[3][8]=
{
{1,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0},
{0,0,0,0,0,0,0,0}
};
char char_switch[24][4]= //最后还有一个 ‘\0’，所以是4个字节。
{
“7”,“8”,“9”,".",“sin”,“x^2”,"+","-",
“4”,“5”,“6”,“0”,“cos”,“sqr”,"*","/",
“1”,“2”,“3”,“c”,“tan”,“cur”,“d”,"="
};
u8 x_line_l[]={0,11,11,11,13,23,25,11};
u8 x_line_r[]={0,11,11,11,25,23,13,11};

void array_set(u8 *array,u8 lenth,u8 set_num) //数字数组清零
{
while(lenth–){
array[lenth]=set_num;
}
}

void calculator_display_Init() //NO_INVERSED
{
u8 m=0,n=0;
u8 left=7,top=20,right=15,bottom=30;

DrawRect(0,0,127,17,1);	
for(m=0;m<3;m++){
	for(n=0;n<8;n++){
		left+=x_line_l[n];
		right+=x_line_r[n];
		DrawRect(left,top+m*13,right,bottom+m*13,1);
		GUI_DrawString(left+1,top+2+m*13,*(char_switch+m*8+n),char_switch_flag[m][n],FONT6X8);
	}
	left=7;right=15;
}
ScreenRefreshAll(main_cache);

}

static u8 i=0,j=0;
void calculator_char_selection()
{
u8 x=0,y=0;

if(G_IS_BIT_SET(key_down,4)){  //up 单击 1
	G_CLEAR_BIT(key_down,4);
	if(i--<1)i=2;
}
if(G_IS_BIT_SET(key_down,5)){ //down 单击 2
	G_CLEAR_BIT(key_down,5);
	if(++i>=3)i=0;
} 
if(G_IS_BIT_SET(key_down,6)){  //right 单击 3
	G_CLEAR_BIT(key_down,6);
	if(++j>=8)j=0;
}
if(G_IS_BIT_SET(key_down,7)){  //left 单击 4
	G_CLEAR_BIT(key_down,7);
	if(j--<1)j=7;
}

for(x=0;x<3;x++){
	for(y=0;y<8;y++){
		if((x==i)&&(y==j))char_switch_flag[i][j]=1;
		else char_switch_flag[x][y]=0;
	}
}

}

TYPE_FLAG alg_judge_type(char c)
{
if(c>=‘0’ && c<=‘9’)return NUMBER;
else if((c == ‘+’)||(c == ‘-’)||(c == ‘*’)||(c == ‘/’)||(c == ‘=’))return YUNSHUAN_1; //这些是需要显示的
else if((c == ‘.’)||(c == ‘c’)||(c == ‘d’))return YUNSHUAN_2; //这些是功能按键，不用显示。
return INVALID_TYPE;
}

//m^n函数
u32 Num_pow(u8 m,u8 n)
{
u32 result=1;
while(n–)result*=m;
return result;
}

float String_To_Num(unsigned char *input_num_buff,unsigned char num_lenth)
{
float result=0;
u8 i=0;
for(i=0;i<num_lenth;i++){
result+=input_num_buff[i]*Num_pow(10,num_lenth-i);
}
return result+input_num_buff[num_lenth];
}

float input_num1=0,input_num2=0,output_num=0;
u8 input_num_buff[8]={0};
extern char str[10];
static u8 string_lenth=0;
static u8 Num_1_2_flag=0;
static u8 num_lenth=0;
static u8 char_flag=0;
volatile TYPE_FLAG rec_state;

void calculator_display_Fuwei()
{
string_lenth=0;Num_1_2_flag=0;num_lenth=0;char_flag=0;input_num1=0;input_num2=0;output_num=0;
array_set(input_num_buff,8,0);
}

void calculator_char_input() //计算器内容处理函数
{
if(G_IS_BIT_SET(key_down,12)){ //确认 双击 1 输入框显示对应的符号。
G_CLEAR_BIT(key_down,12);
rec_state=alg_judge_type(char_switch[i*8+j][0]);

	switch(rec_state)    //显示处理部分
	{
		case NUMBER:case YUNSHUAN_1:
			GUI_DrawString(1+string_lenth*6,1,*(char_switch+i*8+j),NO_INVERSED,FONT6X8);
			if((j==4)||(j==5))string_lenth+=3;  //这是那两列特殊符号函数。
			else string_lenth+=1;
		break;
		case YUNSHUAN_2:case INVALID_TYPE:break;
	}
	
	switch(rec_state){	
		case NUMBER:
			if(Num_1_2_flag==0){
				input_num_buff[num_lenth++]=char_switch[i*8+j][0]-'0';
			}else{
				input_num_buff[num_lenth++]=char_switch[i*8+j][0]-'0';
			}
		break;
		case YUNSHUAN_1:
			switch(char_switch[i*8+j][0]){
				case '+':char_flag=1;break;
				case '-':char_flag=2;break;
				case '*':char_flag=3;break;
				case '/':char_flag=4;break;
				case '=':
					if(Num_1_2_flag==1){    //计算第二个数
						input_num2=String_To_Num(input_num_buff,num_lenth-1);
						array_set(input_num_buff,8,0);
						num_lenth=0;Num_1_2_flag=0;
					}
					switch(char_flag){
						case 1:
							output_num=input_num1+input_num2;
							input_num1=0;input_num2=0;
						break;
						case 2:
							output_num=input_num1-input_num2;
							input_num1=0;input_num2=0;
						break;
						case 3:
							output_num=input_num1*input_num2;
							input_num1=0;input_num2=0;
						break;
						case 4:
							output_num=input_num1/input_num2;
							input_num1=0;input_num2=0;
						break;
					}
					sprintf(str,"%20.3f",(float)output_num); 
					GUI_DrawString(7,9,str,NO_INVERSED,FONT6X8);						
				break;
			}
			if(Num_1_2_flag==0){  //计算第一个数
				input_num1=String_To_Num(input_num_buff,num_lenth-1);				
				array_set(input_num_buff,8,0);
				num_lenth=0;Num_1_2_flag=1;
			}
		break;
		case YUNSHUAN_2:
			switch(char_switch[i*8+j][0]){
				case 'd':
					
				break;
				case 'c':   //屏幕回复原始状态。
					calculator_display_Fuwei();
					ClearCacheArea(1,1,127,17,0);
				break;
				case '.':break;
			}
		break;
		case INVALID_TYPE:break;
	}
}		

}

void Calculator_All()
{
calculator_display_Init();
calculator_char_selection();
calculator_char_input();
}
`