MMA7660加速度传感器I2C程序.docx

/*-*/*飞翔科技MMA7660加速度传感器E-mail: 2008淘宝店：*/*-*/#include /* common defines and macros */#include derivative.h /* derivative-specific definitions */#define SCL PTJ_PTJ7 #define SDA PTJ_PTJ6 #define SCL_dir DDRJ_DDRJ7#define SDA_dir DDRJ_DDRJ6#define BUS_CLOCK 32000000 /总线频率#define OSC_CLOCK 16000000 /晶振频率#define somenop(); asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop); asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop); asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop); asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);asm(nop);signed char X_value,Y_value,Z_value;signed char X_value_final,Y_value_final,Z_value_final; /三轴加速度的最终值/*/* 初始化锁相环 */*/void INIT_PLL(void) CLKSEL &= 0x7f; /set OSCCLK as sysclk PLLCTL &= 0x8F; /Disable PLL circuit CRGINT &= 0xDF; #if(BUS_CLOCK = 40000000) SYNR = 0x44; #elif(BUS_CLOCK = 32000000) SYNR = 0x43; #elif(BUS_CLOCK = 24000000) SYNR = 0x42; #endif REFDV = 0x81; /PLLCLK=2OSCCLK(SYNR+1)/(REFDV+1)64MHz ,fbus=32M PLLCTL =PLLCTL|0x70; /Enable PLL circuit asm NOP; asm NOP; while(!(CRGFLG&0x08); /PLLCLK is Locked already CLKSEL |= 0x80; /set PLLCLK as sysclk/*/* 延时函数 */*/void delay(void) unsigned int i; for(i=0;i7; data=1; somenop(); SCL = 1; somenop(); somenop(); i-; SCL = 0; SDA_dir = 0;/*/* IIC接收数据 */*/signed char I2Creceive(void) unsigned char i=8; unsigned char data=0; SCL_dir = 1; SDA_dir = 0; while(i) SCL = 0; somenop(); somenop(); SCL = 1; somenop(); data=1; data|=SDA; somenop(); i-; SCL = 0; return(data);/*/* IIC读取应答位 */*/void I2Creadack(void) SCL_dir = 1; SDA_dir = 0; SCL = 0; somenop(); somenop(); SCL = 1; somenop(); if(SDA = 1) for(;) ; somenop(); SCL = 0; somenop(); somenop();/*/* IIC发送应答位 */*/void I2Csendack(void) SCL_dir = 1; SDA_dir = 1; SCL = 0; somenop(); SDA = 0; somenop(); SCL = 1; somenop(); somenop(); SCL = 0; somenop(); somenop();/*/* 停止IIC */*/void I2Cstop(void) SCL_dir = 1; SDA_dir = 1; SCL = 0; SDA = 0; somenop(); somenop(); SCL = 1; somenop(); SDA = 1; somenop(); somenop(); SCL_dir = 0; SDA_dir = 0;/*/* 初始化加速度传感器 */*/void INIT_MMA7660(void) I2Cstart(); I2Csend(0x98); /发送从机地址，写入操作 I2Creadack(); I2Csend(0x07); /写入寄存器地址 I2Creadack(); I2Csend(0x01); /设置寄存器的值,设置量程2g，设置测量模式 I2Creadack(); I2Cstop();/*/* 读取3轴加速度 */*/void read3axle(void) I2Cstart(); I2Csend(0x98); /发送从机地址，写入操作 I2Creadack(); I2Csend(0x00); /写入待读取的第一个寄存器地址 I2Creadack(); I2Cstart(); I2Csend(0x99); /发送从机地址，读取操作 I2Creadack(); X_value = I2Creceive(); /读取X轴加速度 I2Csendack(); Y_value = I2Creceive(); /读取Y轴加速度 I2Csendack(); Z_value = I2Creceive(); /读取Z轴加速度 I2Cstop(); /将采集到的数据转换到-3231之间 X_value= X_value2; X_value_final = X_value /4; Y_value= Y_value2; Y_value_final = Y_value /4; Z_value= Z_value2; Z_value_final = Z_value /4;/*/* 主函数 */*/voi