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发表于 2013-1-14 20:28:53
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seeyou2013 发表于 2013-1-12 10:25 
你好，小弟最近也在做MMA7361的实验，，请问mma7361的self-test管脚，与0g-test管脚，我看你的电路图是悬 ...
//-------------------------------------------------------------------
// MMA7361 Demo code, show the 3 axis date through UART periodically
// Hardware connection: X_out PC2
// Y_out PC1
// Z_out PC0
// MMA7361_En PC3
// UART_Tx PD1
// Software UART baudrate 115200 when main frequency is 4M
//-------------------------------------------------------------------
#include "avr/io.h"
//#include "inAVR.h"
#include "stdio.h"
#include "stdbool.h"
#define Max_Axis 3
#define X_Channel 0 //PC2
#define Y_Channel 1 //PC1
#define Z_Channel 2 //PC0
#define MMA7361_EN 0x08 //PC3
const unsigned char Channel_Tbl[Max_Axis]={0x42,0x41,0x40}; //Z,Y,X
const unsigned char Axis_Name[Max_Axis]={'X','Y','Z'};
unsigned char Temp, Temp1, ADC_Done,ShowDebug_Cnt; //Temporary saving cells
unsigned int Axis_Data[Max_Axis];
unsigned long SumReg = 0; //Storage variable
static char SampCnt; //ADC samples counter
#include "functions.c"
int main(void)
{
unsigned char i;
IO_Ports_Init(); //Initialize IO ports
Timers_Init(); //Initialize timers
ADC_Init(); //Initialize ADC
PRR = 0x82; //Reduce consumption 86 (don't stop SPI)
CLKPR = 0x80; //Increase Fcpu
CLKPR = 0x00;
TCCR2B = 0x06;
__disable_interrupt();
__watchdog_reset();
WDTCSR = 0x18; //Enable watchdog, timeout 256ms
WDTCSR = 0x0D;
__enable_interrupt(); //Enable interrupts
MMA7361_Init();
while(1)
{
__watchdog_reset(); //Reset watchdog timer
if(ShowDebug_Cnt==0)
{
ShowDebug_Cnt=30;//13; //Get data periodically
for(i=0;i<Max_Axis;i++) //Get Axis data
Axis_Data=Get_ADC(i,10);
for(i=0;i<Max_Axis;i++) //Show Axis data through UART
{
SW_UART_Tx(Axis_Name);
Put_Axis(Axis_Data);
SW_UART_Tx(' ');
}
SW_UART_Tx(' '); //Next Line
SW_UART_Tx(0x0d);
}
}
}
//SIGNAL(SIG_OVERFLOW2)
#pragma vector=TIMER2_OVF_vect
__interrupt void TMR2irq( void )
{
if(ShowDebug_Cnt!=0)
ShowDebug_Cnt--;
}
//SIGNAL(SIG_ADC)
#pragma vector=ADC_vect
__interrupt void ADCirq( void )
{
SumReg += ADC; //Add result to common sum
if(--SampCnt == 0) //Check number of samples
{
ADC_Done=1; //Measuring is complete
ADCSRA = 0x80; //Stop ADC
}
else
{
ADCSRA |= 0x40; //Start next ADC cycle
}
}
//SIGNAL(__vector_default)
//#pragma vector=default
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发表于 2012-8-8 08:56:13
