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EEPW首頁 > 嵌入式系統(tǒng) > 設計應用 > msp430單片機模擬IIC總線讀取MMA7660三軸加速度傳感器

msp430單片機模擬IIC總線讀取MMA7660三軸加速度傳感器

作者：時間：2016-11-27 來源：網(wǎng)絡

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//-----------主函數(shù)-----------------------------------------------------------

void main(void)

{

OSC_Init();

Port_Init();

TimerA_UART_init();

MMA7660_Init();

__enable_interrupt();

TimerA_UART_print("All Initialization is OK!rn");

for (;;)

{

//__bis_SR_register(LPM0_bits);

Read3axle();

if (X_value_final>0)

P1OUT|= BIT0;

else if(X_value_final<0)

P1OUT&=~ BIT0;

else _nop();

//------------------------------

TimerA_UART_print("X_value---->");

output((unsigned int )X_value,4);

TimerA_UART_print(" ");

//------------------------------

TimerA_UART_print("Y_value---->");

output((unsigned int )Y_value,4);

TimerA_UART_print(" ");

//------------------------------

TimerA_UART_print("Z_value---->");

output((unsigned int )Z_value,4);

TimerA_UART_print("rn");

//------------------------------

P1OUT ^= BIT6 ;

//delay_us(20000);

}

}

//-------------------華麗的分割線-----------------------------------------------------------------

//file2 : g2452uart.h

#include "msp430g2452.h"

//------------------------------------------------------------------------------

// Hardware-related definitions

//------------------------------------------------------------------------------

#define UART_TXD 0x02 // TXD on P1.1 (Timer0_A.OUT0)

#define UART_RXD 0x04 // RXD on P1.2 (Timer0_A.CCI1A)

//------------------------------------------------------------------------------

// Conditions for 9600 Baud SW UART, SMCLK = 1MHz

//------------------------------------------------------------------------------

#define UART_TBIT_DIV_2 (1000000 / (9600 * 2))

#define UART_TBIT (1000000 / 9600)

//------------------------------------------------------------------------------

// Global variables used for full-duplex UART communication

//------------------------------------------------------------------------------

unsigned int txData; // UART internal variable for TX

unsigned char rxBuffer; // Received UART character

//------------------------------------------------------------------------------

// 串口通信的接口函數(shù)說明：

//------------------------------------------------------------------------------

void TimerA_UART_init(void);

//TimerA_UART_init()模擬串口通信初始化函數(shù),在main()函數(shù)中調(diào)用此函數(shù)就可以使用一下兩個函數(shù)了

void TimerA_UART_tx(unsigned char byte);

//TimerA_UART_tx( byte ) 通過串口發(fā)送一字節(jié)的數(shù)據(jù)

void TimerA_UART_print(char *string);

//TimerA_UART_print(*string) 通過串口發(fā)送任意字節(jié)的字符穿

void output(unsigned int num , int n );

//輸出一個數(shù)字

//注：接收的一字節(jié)數(shù)據(jù)存在rxBuffer變量里。

void Port1_Init()

{

P1OUT = 0x00; // Initialize all GPIO

P1SEL = UART_TXD + UART_RXD; // Timer function for TXD/RXD pins

// P1DIR = 0xFF & ~UART_RXD; // Set all pins but RXD to output

//設置TXD為輸出模式，P1.1和P1.2兩個調(diào)試小燈也為輸出模式。RXD為輸入模式。

P1DIR |= UART_TXD+BIT0+BIT6;

P1DIR &=~ UART_RXD;

P1OUT &=~ BIT0+BIT6 ; //初始化讓兩個燈都滅。

}

//------------------------------------------------------------------------------

// Function configures Timer_A for full-duplex UART operation

//------------------------------------------------------------------------------

void TimerA_UART_init(void)

{

Port1_Init(); //P1端口初始化！

TACCTL0 = OUT; // Set TXD Idle as Mark = 1

TACCTL1 = SCS + CM1 + CAP + CCIE; // Sync, Neg Edge, Capture, Int

TACTL = TASSEL_2 + MC_2; // SMCLK, start in continuous mode

}

//------------------------------------------------------------------------------

// Outputs one byte using the Timer_A UART

//------------------------------------------------------------------------------

void TimerA_UART_tx(unsigned char byte)

{

while (TACCTL0 & CCIE); // Ensure last char got TXd

TACCR0 = TAR; // Current state of TA counter

TACCR0 += UART_TBIT; // One bit time till first bit

TACCTL0 = OUTMOD0 + CCIE; // Set TXD on EQU0, Int

txData = byte; // Load global variable

txData |= 0x100; // Add mark stop bit to TXData

txData <<= 1; // Add space start bit

}

//------------------------------------------------------------------------------

// Prints a string over using the Timer_A UART

//------------------------------------------------------------------------------

void TimerA_UART_print(char *string)

{

while (*string) {

TimerA_UART_tx(*string++);

}

}

void output(unsigned int num , int n )

{

char *p,pd[4];

p=pd;

pd[0]=num/1000 +48 ; //千位

pd[1]=num/100 +48 ;// 百位

pd[2]=num0/10 +48 ; //十位

pd[3]=num +48;//個位

while (n--)

TimerA_UART_tx((*p++));

}

//------------------------------------------------------------------------------

// Timer_A UART - Transmit Interrupt Handler

//------------------------------------------------------------------------------

#pragma vector = TIMER0_A0_VECTOR

__interrupt void Timer_A0_ISR(void)

{

static unsigned char txBitCnt = 10;

TACCR0 += UART_TBIT; // Add Offset to CCRx

if (txBitCnt == 0) { // All bits TXed?

TACCTL0 &= ~CCIE; // All bits TXed, disable interrupt

txBitCnt = 10; // Re-load bit counter

}

else {

if (txData & 0x01) {

TACCTL0 &= ~OUTMOD2; // TX Mark 1

}

else {

TACCTL0 |= OUTMOD2; // TX Space 0

}

txData >>= 1;

txBitCnt--;

}

}

//------------------------------------------------------------------------------

// Timer_A UART - Receive Interrupt Handler

//------------------------------------------------------------------------------

#pragma vector = TIMER0_A1_VECTOR

__interrupt void Timer_A1_ISR(void)

{

static unsigned char rxBitCnt = 8;

static unsigned char rxData = 0;

switch (__even_in_range(TA0IV, TA0IV_TAIFG)) { // Use calculated branching

case TA0IV_TACCR1: // TACCR1 CCIFG - UART RX

TACCR1 += UART_TBIT; // Add Offset to CCRx

if (TACCTL1 & CAP) { // Capture mode = start bit edge

TACCTL1 &= ~CAP; // Switch capture to compare mode

TACCR1 += UART_TBIT_DIV_2; // Point CCRx to middle of D0

}

else {

rxData >>= 1;

if (TACCTL1 & SCCI) { // Get bit waiting in receive latch

rxData |= 0x80;

}

rxBitCnt--;

if (rxBitCnt == 0) { // All bits RXed?

rxBuffer = rxData; // Store in global variable

rxBitCnt = 8; // Re-load bit counter

TACCTL1 |= CAP; // Switch compare to capture mode

//__bic_SR_register_on_exit(LPM0_bits); // Clear LPM0 bits from 0(SR)

}

}

break;

}

}

//----------------------華麗的分割線2--------------------------------------------------------

//file :MMA7660FC.h

#ifndef _MMA7660FC_H

#define _MMA7660FC_H

#define MMA7660FC_ADD 0x4C //Please contact the factory to request a different IIC address

#define MMA7660FC_MW_ADD 0x98 //master write address

#define MMA7660FC_MR_ADD 0x99 //master read address

#define SlaveAddress 0x98 //從機地址

#define X_outAddr 0x00

#define Y_outAddr 0x01

#define Z_outAddr 0x02

// IIC Register Address

#define MMA7660_XOUT 0x00

#define MMA7660_YOUT 0x01

#define MMA7660_ZOUT 0x02

#define MMA7660_TILT 0x03

#define MMA7660_SRST 0x04

#define MMA7660_SPCNT 0x05

#define MMA7660_INTSU 0x06

#define MMA7660_MODE 0x07

#define MMA7660_SR 0x08

#define MMA7660_PDET 0x09

#define MMA7660_PD 0x0A

#endif

////////////////////////////////////////////////////////////////////////////////////////////////////\\\\\\\\\\\\

//以上為所有程序源碼！編譯工具CCS V5.0

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嵌入式系統(tǒng) msp430單片機模擬IIC總線MMA7660三軸加速度傳感 | 2016-11-27

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