Diff: main.cpp

Revision:

0:76c6ddb1425b

Child:

1:32df8ff2011e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun May 08 14:36:12 2016 +0000
@@ -0,0 +1,119 @@
+#include "mbed.h"
+#include"time.h"
+
+#define UPA 2000//坐时最大加速度值
+
+uint16_t x_a,y_a,z_a;
+bool flag = 0;
+
+SPI spi_master(P0_6,P0_5,P0_7); //mosi miso sclk 
+DigitalOut cs(P0_4);
+
+//Serial pc(P0_23,P0_25);
+
+Serial pc(P0_9,P0_11);
+
+PwmOut buzzer(p22);//buzzer
+float frequency[]={659,554,659,554,440,494,554,587,494,659,554,440};
+float beat[]={1,1,1,1,1,0.5,0.5,1,1,1,1,2}; //节拍数组
+
+uint8_t LIS3DH_SPI_RD(uint8_t addr)
+{
+    uint8_t  temp;
+    cs = 0;
+    wait_us(10);
+    spi_master.write(addr);      
+    temp=spi_master.write(0xff);
+    wait_us(10);
+    cs = 1;
+    return temp;
+}
+
+void LIS3DH_SPI_WR(uint8_t addr,uint8_t wrdata)
+{  
+    cs = 0;
+    wait_us(10);
+    spi_master.write(addr);
+    spi_master.write(wrdata);
+    wait_us(10);
+    cs = 1;
+}
+
+void SPI_LIS3DH_Init()//启动函数
+{
+   spi_master.format(8,3);
+   spi_master.frequency(100000);
+   wait_ms(5);
+   LIS3DH_SPI_WR(0x24,0x80);
+   wait_ms(5);
+   LIS3DH_SPI_WR(0x20,0x17);
+   LIS3DH_SPI_WR(0x23,0x80);
+}
+
+void get_val(void)//得到加速度函数
+{
+    uint8_t Dx_L=1,Dy_L=1,Dz_L=1;
+    uint8_t Dx_H=1,Dy_H=1,Dz_H=1;
+    if(LIS3DH_SPI_RD(0x0f|0x80)==0x33)
+    {
+         printf("check device ok!\r\n");
+         flag=1;
+         Dx_H=LIS3DH_SPI_RD(0x29|0x80);   
+         Dx_L=LIS3DH_SPI_RD(0x28|0x80);
+         Dy_H=LIS3DH_SPI_RD(0x2b|0x80);
+         Dy_L=LIS3DH_SPI_RD(0x2A|0x80);
+         Dz_H=LIS3DH_SPI_RD(0x2d|0x80);
+         Dz_L=LIS3DH_SPI_RD(0x2C|0x80);  
+    }
+    else
+    { 
+        printf("check device err!\r\n");
+        wait(1);
+    }
+    x_a=Dx_H<<8|Dx_L/16;
+    y_a=Dy_H<<8|Dy_L/16;
+    z_a=Dz_H<<8|Dz_L/16;
+}
+void buzzerini(void)
+{
+   for (int i=0;i<=11;i++) {
+       buzzer.period(1/(2*frequency[i])); // 设置PWM周期
+       buzzer=0.5; // 设置占空比
+       wait(0.4*beat[i]); // 保持节拍周期
+                           }
+}
+void sit_judgement()
+{   int flag=0;
+    clock_t start,end;
+    start=clock();
+    get_val();
+    while(x_a<=UPA)
+    {   get_val(); 
+        end=clock();
+        if(((double)end-start)/CLK_TCK>30)//坐了30s
+        {   flag=1;
+            break;
+            }
+    }
+    while(flag)
+    {    buzzerini();
+         get_val();
+    }
+}
+        
+
+    
+
+int main(void)
+{
+  SPI_LIS3DH_Init();
+  while(1)
+  {  
+     sit_judgement();
+     if(flag)
+     {   
+         flag=0;
+         wait(1);
+     }
+  }
+}
\ No newline at end of file