sdtask.c

加速度采集器。基于ATMega16L.AVRSTUIDIO4

#include "sdTask.h"
#include "lcd.h"
#include <avr/io.h>
#include <avr/pgmspace.h>

//==========Vars=================================
//Signals
unsigned char sdCardInserted;

//Queue
#define SDQUEUE_LENGTH 10	//9 records
unsigned char sdQueueFront = 0;
unsigned char sdQueueEnd = 0;
unsigned long sdQueueTime[SDQUEUE_LENGTH];
unsigned short sdQueueImpact[SDQUEUE_LENGTH];

//SDCard Interface
unsigned short sdBufferLength = 0;
extern unsigned char sdBuffer[512];

//SDCard name
//必须大写
const char filenamePrefix[] = "BOX";
const unsigned char fileIndexLength = 5;
const char filenameExt[] = "DAT";

//Error Strings
const prog_char errorInfo[4][9]={
	"Unformat",
	"DiskFull",
	"RootFull",
	"IdxFull"};


//===========================================

void sdTaskInit()
{
	unsigned char ucTemp;
	unsigned char strBuffer[9];

	ucTemp = fatInit();
	if(!ucTemp)
		ucTemp = fileCreateSequential(filenamePrefix,fileIndexLength,filenameExt);
//	ucTemp = 1;//test
	if(!ucTemp)
	{	//successful: display an arrow
		lcdWriteChar(1,1,0x7C);//Line 2 col 2
		sdCardInserted = 1;
	}
	else if(ucTemp<=4)
	{
		//LCD display error info
		strlcpy_P  (strBuffer,errorInfo[ucTemp-1],9);  
		lcdWriteString(0,0,8,strBuffer); //Line 1 col 0

		//wait for key pressed
		while(!((~PINB)&0x0F));
		lcdClearScreen();
	}
	return;
}

void sdTask()
{
	if(!sdCardInserted)
		return;
	//if buffer not full deque
	if(sdBufferLength<512)
		while(sdDeQueue((unsigned long*)(sdBuffer+sdBufferLength),(unsigned long*)(sdBuffer+sdBufferLength+4))
			&& sdBufferLength<512)
				sdBufferLength+=8;
	if(sdBufferLength>=512)
	{
		sdBufferLength = 0;
		if(fileWriteBuffer())
		{
			sdCardInserted = 0;
			lcdWriteChar(1,1,' ');
		}
	}
}

void sdTaskFinish()
{
	if(!sdCardInserted)
		return;
	fileClose(sdBufferLength);
	sdCardInserted = 0;
}

void sdEnQueue(unsigned long *pTime, unsigned short *pImpact)
{
	//check queue full
	if(sdQueueFront==sdQueueEnd+1)
		return;
	if(sdQueueFront==0 && sdQueueEnd==SDQUEUE_LENGTH-1)
		return;
	//Fill item
	sdQueueTime[sdQueueEnd] = *pTime;
	sdQueueImpact[sdQueueEnd] = *pImpact;
	//move pointer
	sdQueueEnd++;
	if(sdQueueEnd>=SDQUEUE_LENGTH)
		sdQueueEnd = 0;
}
unsigned char sdDeQueue(unsigned long *pTime, unsigned long *pImpact)
{
	if(sdQueueFront==sdQueueEnd)
		return 0;					//QueueEmpty
	*pTime = sdQueueTime[sdQueueFront];
	*pImpact = sdQueueImpact[sdQueueFront];
	sdQueueFront++;
	if(sdQueueFront>=SDQUEUE_LENGTH)
		sdQueueFront = 0;
	return 1;
}