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1、MSP430G2553 制作的自行车测度系统一，功能介绍：本系统主要用于安装在自行车上测量自行车的运行速度和行驶距离。 然后将速度和距离信息显示在显示在 LCD显示屏上。 (1) 处理器选用的是 TI 的MSP430G2553单片机(2) 测速装置选用的是霍尔器件，在车圈上固定一个磁铁，然后430 连接霍尔器件，通过输入捕获功能测量车轮的转动输出的脉冲的周期 在加上事先计算出车轮的直径就可计 算出车子的运行速度和行驶距离(3) 显示屏选用的是 NOKIA5110 LCD的显示屏，此显示屏的成本比较低，可以满足我的显示要求。(4) 整个系统有两个按键，一个是距离清零按键，按下该按键可以将显示的距
2、离清零，这样方便测量起始地和目的地的距离， 另外一个按键是用于打开 LCD的背光的，用于夜 晚 使用。当夜晚光线比较暗时，按下该按键 LCD的背光打开，方便看清楚显示的东西。在按一下背光熄灭。(5) 整个系统的供电的用到 2 节 7 号电池供电，当平常车子没有运行的时候， 430处于低功耗状态。耗电比较少，现在测速系统已将安装在我车子上正常工作 3 个月了二，系统框图图 1 是整个系统的框图 . LCD显示屏和 MSP430G2553的连接采用的 SPI 接口，霍尔传感器和按键和 430 之间是 IO 口连接。三，系统原理图图 2 是整个系统的原理图四，程序代码/* *#include#inc
3、lude#include#includeunsigned char Count, First_Time;unsigned int REdge1, REdge2, FEdge;unsigned char MST_Data, SLV_Data;#define DC P2OUT = P2OUT|(15)#define SCE P2OUT = P2OUT|(14)#define CLK_H P1OUT=P1OUT|(15)#define CLK_L P1OUT=P1OUT&(15)#define Data_H P1OUT=P1OUT|(17)#define Data_L P1OUT=P1OUT&(17
4、)#define u8 unsigned char#define u16 unsigned inttypedef structu8 x;u8 y;point;/*-5110屏幕尺寸和功能宏定义-*/#define DATA 1 /数据#define CMD 0 /命令#define LCD_X 84 / 液晶屏横坐标宽度#define LCD_ROW LCD_X /液晶屏列宽度void LCD_write_byte(unsigned char dat, unsigned char command);void LCD_init(void);void LCD_init(void);void LCD
5、_set_XY(unsigned char X, unsigned char Y);void LCD_clear(void);void LCD_write_char(unsigned char c);void LCD_write_String(unsignedchar X,unsigned char Y,unsigned char *s);void LCD_write_byte(unsigned char dat, unsigned char command)unsigned int i;/ LCD_SCE = 0; /5110 P2OUT &=BIT4;片选有效，允许输入数据if (comm
6、and = 0) / / LCD_DC = 0; P2OUT &=BIT5; else / LCD_DC = 1;写命令P2OUT |=BIT5;/ 写数据for (i=0;i8;i+)CLK_L;/spi_clk=0;if(dat & 0x80)=0x80)Data_H;elseData_L;CLK_H; / spi_clk=1;dat=(dat1);P2OUT |=BIT4;void LCD_init(void)P2OUT &=BIT4;P1OUT &= BIT4;P1OUT |= BIT4;LCD_write_byte(0x21, 0); / LCD 模式设置 : 芯片活动，水平寻址，使
7、用扩展指令LCD_write_byte(0xc8, 0); /设置液晶偏置电压LCD_write_byte(0x06, 0); / LCD_write_byte(0x13, 0); / 1:48温度校正LCD_write_byte(0x20, 0); /使用基本命令，V=0，水平寻址LCD_clear(); /清屏LCD_write_byte(0x0c, 0); / P2OUT |=BIT4;设定显示模式，正常显示void LCD_set_XY(unsigned char X, unsigned char Y)LCD_write_byte(0x80 | X, 0); / X行( 横坐标 )LC
8、D_write_byte(0x40 | Y, 0); / column 列( 纵坐标 )/*-/LCD_clear: LCD清屏函数-*/void LCD_clear(void)unsigned char t;unsigned char k;LCD_set_XY(0,0);for(t=0;t6;t+)for(k=0;k84;k+)LCD_write_byte(0x00,1);void LCD_write_char(unsigned char c)unsigned char i;c-=0x20; /ASCII码减去 0x20for (i=0; i6; i+)LCD_write_byte(ASCI
9、I_6_8c, 1);void LCD_write_String(unsignedchar X,unsigned char Y,unsignedchar *s)LCD_set_XY(X,Y);while (*s) /等效 *s!=0LCD_write_char(*s);s+;static float speed;static unsigned char display10;static unsigned char display210;static unsigned int temp ;static unsigned int distance=0;static float Period;sta
10、tic float Distance_km;int main(void)volatile unsigned int i;unsigned char lcd_buf684;WDTCTL = WDTPW + WDTHOLD; / Stop watchdog timerP1DIR |= BIT0; / P1.0/LED OutputP1OUT &= BIT0; / LED offif (CALBC1_8MHZ=0xFF) / If calibration constant erasedwhile(1); / do not load, trap CPU!DCOCTL = 0; / Select low
11、est DCOx and MODx settingsBCSCTL1 = CALBC1_8MHZ; / Set DCO to 8MHzDCOCTL = CALDCO_8MHZ;P1DIR &= BIT2;P1SEL |= BIT2;P2DIR &= BIT2;P2DIR &= BIT1;P2IES |=BIT2+BIT1;P2IE |=BIT2+BIT1;P1DIR |= BIT0;P1DIR|=BIT4|BIT5|BIT7;TA0CCTL1 = CAP + CM_3 + CCIE + SCS + CCIS_0;TA0CTL |= TASSEL_1 + MC_2 + TACLR; / ACLK, Cont Mode; start timerCount = 0x0;First_Time = 0x01;P2OUT = 0x00;P2DIR |=BIT5+BIT4 ;P1DIR |=BIT4 ;_EINT();P1OUT &= BIT4; / Now with SPI signals initialized,P1OUT |= BIT4; / reset slaveLCD_init(); /初始化 LCD模
