实验46_1 FPU测试(Julia分形)实验_开启硬件FPU.doc

#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "led.h"
#include "key.h"
#include "lcd.h"
#include "timer.h"

//46_1,本版本为开启硬件FPU版本.

//FPU模式提示
#if __FPU_USED==1
#define SCORE_FPU_MODE "FPU On"
#else
#define SCORE_FPU_MODE "FPU Off"
#endif

#define ITERATION 128 //迭代次数
#define REAL_CONSTANT 0.285f //实部常量
#define IMG_CONSTANT 0.01f //虚部常量
//颜色表
u16 color_map[ITERATION];
//缩放因子列表
const u16 zoom_ratio[] =
{
120, 110, 100, 150, 200, 275, 350, 450,
600, 800, 1000, 1200, 1500, 2000, 1500,
1200, 1000, 800, 600, 450, 350, 275, 200,
150, 100, 110,
};

//初始化颜色表
//clut:颜色表指针
void InitCLUT(u16 * clut)
{
u32 i=0x00;
u16 red=0,green=0,blue=0;
for(i=0;i<ITERATION;i++)//产生颜色表
{
//产生RGB颜色值
red=(i*8*256/ITERATION)%256;
green=(i*6*256/ITERATION)%256;
blue=(i*4*256 /ITERATION)%256;
//将RGB888,转换为RGB565
red=red>>3;
red=red<<11;
green=green>>2;
green=green<<5;
blue=blue>>3;
clut[i]=red+green+blue;
}
}

//产生Julia分形图形
//size_x,size_y:屏幕x,y方向的尺寸
//offset_x,offset_y:屏幕x,y方向的偏移
//zoom:缩放因子
void GenerateJulia_fpu(u16 size_x,u16 size_y,u16 offset_x,u16 offset_y,u16 zoom)
{
u8 i;
u16 x,y;
float tmp1,tmp2;
float num_real,num_img;
float radius;
for(y=0;y<size_y;y++)
{
for(x=0;x<size_x;x++)
{
num_real=y-offset_y;
num_real=num_real/zoom;
num_img=x-offset_x;
num_img=num_img/zoom;
i=0;
radius=0;
while((i<ITERATION-1)&&(radius<4))
{
tmp1=num_real*num_real;
tmp2=num_img*num_img;
num_img=2*num_real*num_img+IMG_CONSTANT;
num_real=tmp1-tmp2+REAL_CONSTANT;
radius=tmp1+tmp2;
i++;
}
LCD->LCD_RAM=color_map[i];//绘制到屏幕
}
}
}
u8 timeout;
int main(void)
{
u8 key;
u8 i=0;
u8 autorun=0;
float time;
u8 buf[50];
Stm32_Clock_Init(336,8,2,7);//设置时钟,168Mhz
delay_init(168); //延时初始化
uart_init(84,115200); //初始化串口波特率为115200
LED_Init(); //初始化LED
KEY_Init();
LCD_Init();
TIM3_Int_Init(65535,8400-1);//10Khz计数频率,最大计时6.5秒超出
POINT_COLOR=RED;
LCD_ShowString(30,50,200,16,16,"Explorer STM32F4");
LCD_ShowString(30,70,200,16,16,"FPU TEST");
LCD_ShowString(30,90,200,16,16,"ATOM@ALIENTEK");
LCD_ShowString(30,110,200,16,16,"2014/7/2");
LCD_ShowString(30,130,200,16,16,"KEY0:+ KEY2:-"); //显示提示信息
LCD_ShowString(30,150,200,16,16,"KEY_UP:AUTO/MANUL"); //显示提示信息
delay_ms(1200);
POINT_COLOR=BLUE; //设置字体为蓝色
InitCLUT(color_map);//初始化颜色表
while(1)
{
key=KEY_Scan(0);
switch(key)
{
case KEY0_PRES:
i++;
if(i>sizeof(zoom_ratio)/2-1)i=0;//限制范围
break;
case KEY2_PRES:
if(i)i--;
else i=sizeof(zoom_ratio)/2-1;
break;
case WKUP_PRES:
autorun=!autorun; //自动/手动
break;
}
if(autorun==1)//自动时,自动设置缩放因子
{
i++;
if(i>sizeof(zoom_ratio)/2-1)i=0;//限制范围
}
LCD_Set_Window(0,0,lcddev.width,lcddev.height);//设置窗口
LCD_WriteRAM_Prepare();
TIM3->CNT=0;//重设TIM3定时器的计数器值
timeout=0;
GenerateJulia_fpu(lcddev.width,lcddev.height,lcddev.width/2,lcddev.height/2,zoom_ratio[i]);
time=TIM3->CNT+(u32)timeout*65536;
sprintf((char*)buf,"%s: zoom:%d runtime:%0.1fms\r\n",SCORE_FPU_MODE,zoom_ratio[i],time/10);
LCD_ShowString(5,lcddev.height-5-12,lcddev.width-5,12,12,buf);//显示当前运行情况
printf("%s",buf);//输出到串口
LED0=!LED0;
}
}