pwm.c

ARM7下用图形用户界面实现LED,KEY,MOTOR,AD功能

#include "hardware.h"
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/ioctl.h>
#include <pthread.h>
#include "temp.h"

#include "nano-X.h"

#define SPE6I			PCONE&=(~0x3000)
#define SPE6O			PCONE|=0x1000
#define SPE60			PDATE&=(~0x40)
#define SPE61			PDATE |=0x40
#define CONT              10
#define MID               CONT/2
extern GR_GC_ID gc;
void init_pwm();
void init_pe6();
int readtemperature();
void delay(int t);
int init_ds18b20();
void writeonechar(unsigned char command);
unsigned char readonechar();
void * pwm(void *data);
void dotemp(float temp,GR_GC_ID gc);
void init_pwm()
{
    TCFG0|=((0<<24)|(0x19<<8) );
    TCFG1&=(~0xf<<8);
}
void init_pe6()
{
    SPE6I;
    SPE6O;
    PUPD=0x0;
}
void delay(int t)
{
    TCNTB2= CONT * t;
    TCON|=(0x1<<13);            
    TCON&=~(0x1<<13);
    TCON|=(0x1<<12);   
    while(!TCNTO2);
    while(TCNTO2);
    TCON&=~(0x1<<12);
}

int init_ds18b20()
{
       
	SPE61;
    SPE60;
    delay(80);
    SPE61; 
    delay(2);
    PCONE&=(~0x3000);
    delay(4);
    return (PDATE&0x40)>>6;
}
void writeonechar(unsigned char command)
{
	unsigned char i;
	unsigned char j;
	SPE6O;	
	for(i=0;i<8;i++)
	{
		SPE60;
		for(j=0;j<10;j--);
		if((command & 0x01)==0)
		{
			SPE60;
			delay(4);
                }
		else
		{
			SPE61;
			delay(4);
		}
		SPE61;
		for(j=0;j<10;j--);
		command>>=1;
	}
}
unsigned char readonechar()
{
	unsigned char i;
	unsigned char j;
	unsigned char temp;

	temp=0;
	for(i=0;i<8;i++)
	{
		SPE6O;
        for(j=0;j<5;j++);
		SPE60;
		for(j=0;j<5;j++);
		temp>>=1;
		SPE6I;
		delay(2);
		if(PDATE&0x40);
		if(PDATE&0x40)
			temp|=0x80;
		else
			temp|=0x00;
		delay(10);
	}
	return temp;
}

void * pwm(void *data)
{
    int t;
    float tt;
    int i=0;
	init_pe6();
	init_pwm();
	PDATE |=0x40;
	t=readtemperature();
	tt=t*0.0625;
 	if(tt-dtemp<10)
	{
        	dotemp(tt,gc);
	}
		
    dtemp=tt;
	for(i=0;i<660;i++);
    return NULL;
}

int readtemperature()
{
    unsigned char a;
    unsigned char b,i;
    int t;
    INTMSK|=(0x1<<26);
    PDATE |=0x40;
    delay(33);
    init_ds18b20();
    delay(33);
    writeonechar(0xCC);
    writeonechar(0x44);
    SPE6O;
    SPE61;
    for(i=0;i<10;i++)
    	delay(1000);
    if(init_ds18b20()==1)
    	printf("error\n");
    delay(33);                    //iiiiiiiiiiiii
    writeonechar(0xCC);
    writeonechar(0xBE);
    SPE6O;
    SPE61;
    delay(100);
   	a=readonechar();
    b=readonechar();
    INTMSK&=~(0x1<<26);
    t=b;
    t<<=8;
    t=t|a;
    delay(1000);
	return t;

}