 |
级别:
|
|
积分:773分 |
|
注册:2006年08月13日
|
|
|
模拟IIC与msp430F133通信输出结果不对
程序代码如下：按照此程序输出的传感器（HP03）内存的几个常数不对，不知道为什么？调试了一周了，郁闷
//Function:模拟IIC与MCU通信，压力传感器的MCLK接MCU的ACLK（32768Hz输出）
// Vss--> GND
// VDD-->VCC
// MCLK(32768HZ)-->P2.0
// XCLK-->P6.1
// SDA-->P6.0
// SCL-->P6.2
//*******************head files**********************************
#include<msp430x14x.h>
//#include"io430.h"
#include<math.h>
//*********************symbol define*****************************
#define SDA_STATE P6IN & BIT0 //读入SDA状态
unsigned int C1=0;
unsigned int C2=0;
unsigned int C3=0;
unsigned int C4=0;
unsigned int C5=0;
unsigned int C6=0;
unsigned int C7=0;
unsigned char AA=0;
unsigned char BB=0;
unsigned char CC=0;
unsigned char DD=0;
unsigned int D1=0;
unsigned int D2=0;
long float DUT=0;
long float OFF=0;
long float SENS=0;
long float X=0;
long float Press=0;
long float Temp=0;
//*******************function declaration************************
void IIC_start(void);
void IIC_stop(void);
void IIC_SDA_HIGH(void);
void IIC_SDA_LOW(void);
void IIC_SCL_HIGH(void);
void IIC_SCL_LOW(void);
void IIC_ACK(void);
void IIC_NOACK(void);
void MCLKON(void);
void MCLKOFF(void);
void XCLR_LOW(void);
void XCLR_HIGH(void);
void IIC_ReadCalDate(void);
unsigned char IIC_readbyte(void);
void IIC_writebyte(unsigned char);
void ReadTemperaturePressureAD(void);
void CalculatepressTemp(void);
unsigned int ReadPressureAD();
unsigned int ReadTemperatureAD();
void SysDelay1ms(unsigned int);
void Delay16us(void);
void CPU_Init(void); //初始化时钟
void Port_Init(void); //初始化I/O
//********************************************************
//function:read calcute data and pressure,temp data
//********************************************************
void main( void )
{
//SysDelay1ms(100);
CPU_Init();
Port_Init();
//SysDelay2ms(50);
IIC_ReadCalDate();
while(1)
{
ReadTemperaturePressureAD();
CalculatepressTemp();
SysDelay1ms(100);
}
}
//********************************************************
void CPU_Init(void)
{
unsigned char i;
WDTCTL = WDTPW + WDTHOLD; // Stop watchdog timer to prevent time out reset
// Configure internal clocks
DCOCTL = DCO1 + DCO2; // Set digitally controlled oscillator to ~1MHz
BCSCTL1 = XT2OFF + RSEL2;
BCSCTL2 = SELM0; // MCLK and SMCLK use this oscillator
do
{
IFG1 &= ~OFIFG; //clear OSCFault flag_breathe
for(i=0xFF; i>0; i--); //delay wait
}
while((IFG1&OFIFG)!=0);
}
//******************** Port Initialization****************
// Vss GND
// //P6.3 VDD
// P2.0 MCLK(32768HZ)
// P6.1 XCLK
// P6.0 SDA
// P6.2 SCL
//********************************************************
void Port_Init(void)
{
//P6SEL &= ~0x08; //P6.3普通IO
//P6DIR |= 0x08; //P6.3输出1
//P6OUT |= 0x08;
P2DIR |= 0x01;
P2SEL |= 0x01; //P2.0输出ACLK
P6SEL &= ~0x02; //P6.1普通IO
P6DIR |= 0x02; //P6.1输出
P6SEL &= ~0x01; //P6.0普通IO
P6SEL &= ~0x04; //P6.2普通IO
P6DIR |= 0x04; //P6.2输出
}
//*********************************************************
void IIC_ReadCalDate(void)
{
unsigned int ucValue=0;
// P6OUT &= ~0x02; //P6.1输出0
IIC_start();
IIC_writebyte(0xa0); //contain stop signal
IIC_writebyte(16);
IIC_start();
IIC_writebyte(0xa1);
ucValue=IIC_readbyte();
IIC_ACK();
C1=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C1<<=8;
C1|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C2=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C2<<=8;
C2|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C3=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C3<<=8;
C3|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C4=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C4<<=8;
C4|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C5=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C5<<=8;
C5|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C6=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C6<<=8;
C6|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C7=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
C7<<=8;
C7|=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
AA=ucValue;
ucValue=IIC_readbyte();
IIC_ACK();
BB=ucValue;
//UartSend(AA);
//UartSend(BB);
ucValue=IIC_readbyte();
IIC_ACK();
CC=ucValue;
ucValue=IIC_readbyte();
IIC_NOACK();
IIC_stop();
DD=ucValue;
}
//*********************************************************
void ReadTemperaturePressureAD(void)
{
long sumADvalue=0;
XCLR_HIGH();
MCLKON();
SysDelay1ms(2);
D1=ReadPressureAD();
sumADvalue+=D1;
D1=ReadPressureAD();
sumADvalue+=D1;
D1=ReadPressureAD();
sumADvalue+=D1;
D1=ReadPressureAD();
sumADvalue+=D1;
D1=sumADvalue>>2;
D2=ReadTemperatureAD();
P6SEL &= ~0x01; //P6.0普通IO
P6DIR |= 0x01; //P6.0输出
P6OUT &= ~0x01;
P6SEL &= ~0x04; //P6.2普通IO
P6DIR |= 0x04; //P6.2输出
P6OUT &= ~0x04;
MCLKOFF();
XCLR_LOW();
}
//*********************************************************
unsigned int ReadTemperatureAD(void)
{
unsigned char ucData=0;
unsigned int ADT=0;
IIC_start();
IIC_writebyte(0xee);
IIC_writebyte(0xff);
IIC_writebyte(0xe8);
IIC_stop();
SysDelay1ms(40);
IIC_start();
IIC_writebyte(0xee);
IIC_writebyte(0xfd);
IIC_start();
IIC_writebyte(0xef);
ucData=IIC_readbyte();
IIC_ACK();
//UartSend(CC);
ADT=ucData;
ADT<<=8;
ucData=IIC_readbyte();
IIC_NOACK();
IIC_stop();
ADT|=ucData;
//UartSend(DD);
return (unsigned int)(ADT);
}
unsigned int ReadPressureAD(void)
{
unsigned char ucData=0;
unsigned int ADP=0;
IIC_start();
IIC_writebyte(0xee);
IIC_writebyte(0xff);
IIC_writebyte(0xf0);
IIC_stop();
SysDelay1ms(40);
IIC_start();
IIC_writebyte(0xee);
IIC_writebyte(0xfd);
IIC_start();
IIC_writebyte(0xef);
ucData=IIC_readbyte();
IIC_ACK();
ADP=ucData;
ADP<<=8;
ucData=IIC_readbyte();
IIC_NOACK();
IIC_stop();
ADP|=ucData;
//UartSend(BB);
return (unsigned int)(ADP);
}
//*************Calculate press and temp*******************
void CalculatepressTemp(void)
{
if (D2 >= C5)
{
DUT = D2 - C5 - (D2 - C5) * (D2 - C5) * AA / 16384 / (1 << CC);
}
else // (D2 < C5)
{
DUT = D2 - C5 - (D2 - C5) * (D2 - C5) * BB / 16384 / (1 << CC);
}
OFF = (C2 * 4) + ((C4 - 1024) * DUT * 4 / 16384);
SENS = (C1 * 1024 + C3 * DUT) / 1024;
X = (SENS * (D1 - 7168) - OFF * 16384) / 16384;
Press = (X * 10 + C7 * 32) / 32; // Final pressure value (in millibars)
Temp = 250 + ( DUT * C6 / 256 * (1 << DD) - DUT * 256) / (1 << DD) / 256; // Final temperature value
Press = Press * 98312 / 131072; // Convert to mmHg
}
//********************1ms定时程序************************
void SysDelay1ms(unsigned int ms)
{
int i,j;
for(i=0;i<ms;i++)
{
for(j=0;j<200;j++);
}
}
//********************// 20us定时程序***********************
//void Delay20us(void)
//{
// _NOP();
// _NOP();
// _NOP();
// _NOP();
// _NOP();
// _NOP();
//}
//**********************// 16us定时程序********************
void Delay16us(void)
{
_NOP();
}
//*********************************************************
void IIC_writebyte(unsigned char ucData)
{
unsigned char i;
for(i=0;i<8;i++)
{
IIC_SCL_LOW();
Delay16us();
if((ucData & 0x80)==0x80)
{
IIC_SDA_HIGH();
Delay16us();
}
else
{
IIC_SDA_LOW();
Delay16us();
}
IIC_SCL_HIGH();
Delay16us();
ucData<<=1;
IIC_SCL_LOW();
}
//stop signal
IIC_SDA_HIGH();
Delay16us();
IIC_SCL_LOW();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
IIC_SCL_LOW();
Delay16us();
}
unsigned char IIC_readbyte(void)
{
unsigned char ucValue=0;
unsigned char ucindex=0;
IIC_SDA_HIGH(); //output high level,get ready for accept
Delay16us();
for(ucindex=0;ucindex<8;ucindex++)
{
ucValue<<=1;
IIC_SCL_LOW();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
P6SEL &= ~0x01; //P6.0普通IO
P6DIR &= ~0x01;
if(SDA_STATE)
ucValue|=1;
Delay16us();
IIC_SCL_LOW();
Delay16us();
}
return (unsigned int)(ucValue);
}
//*********************************************************
void IIC_start(void)
{
IIC_SDA_HIGH();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
IIC_SDA_LOW();
Delay16us();
IIC_SCL_LOW();
Delay16us();
}
void IIC_stop(void)
{
IIC_SCL_LOW();
Delay16us();
IIC_SDA_LOW();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
IIC_SDA_HIGH();
Delay16us();
}
//*********************************************************
void IIC_ACK(void)
{
IIC_SDA_LOW();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
IIC_SCL_LOW();
Delay16us();
}
void IIC_NOACK(void)
{
IIC_SDA_HIGH();
Delay16us();
IIC_SCL_HIGH();
Delay16us();
IIC_SCL_LOW();
Delay16us();
}
//*********************************************************
void MCLKON(void)
{
P2SEL |= 0x01; // set p2.0 as ACLK Output for sensor MCLK
P2DIR |= 0x01; //P2.0输出
}
void MCLKOFF(void) // shutdown p2.0 as ACLK Output
{
P2SEL &= 0x00;
P2DIR |= 0x01; //P2.0输出
P2OUT &= ~0x01; //P2.0 = 0
}
void XCLR_LOW(void)
{
P6SEL &= ~0x02; //P6.1普通IO
P6DIR |= 0x02; //P6.1输出0
P6OUT &= ~0x02;
}
void XCLR_HIGH(void)
{
P6SEL &= ~0x02; //P6.1普通IO
P6DIR |= 0x02; //P6.1输出1
P6OUT |= 0x02;
}
//*********************************************************
void IIC_SDA_HIGH(void)
{
P6SEL &= ~0x01; //P6.0普通IO
P6DIR |= 0x01; //P6.0输出
P6OUT |= 0x01; //P6.0输出1
}
void IIC_SDA_LOW(void)
{
P6SEL &= ~0x01; //P6.0普通IO
P6DIR |= 0x01; //P6.0输出
P6OUT &= ~0x01; //P6.0输出0
}
//*********************************************************
void IIC_SCL_HIGH(void)
{
P6SEL &= ~0x04; //P6.2普通IO
P6DIR |= 0x04;
P6OUT |= 0x04; //P6.2输出1
}
void IIC_SCL_LOW(void)
{
P6SEL &= ~0x04; //P6.2普通IO
P6DIR |= 0x04;
P6OUT &= ~0x04; //P6.2输出0
|
|
