shuixx/ds18b20
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shuixx 2019-06-16 12:36:11 +08:00
parent 9ca61be337
commit d0c34bf05c
1 changed files with 23 additions and 8 deletions
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31
ds18b20.c
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@ -50,18 +50,16 @@ unsigned char read_char(void)
unsigned char dat = 0; unsigned char dat = 0;
// spin_lock(&lock); // spin_lock(&lock);
DQ_OUT;
for(i=0; i<8; i++) { for(i=0; i<8; i++) {
DQ_OUT;
DQ_L; DQ_L;
udelay(2); udelay(2);
dat >>= 1;
DQ_IN; DQ_IN;
udelay(12); dat >>= 1;
udelay(2);
if (DQ_V) if (DQ_V)
dat |= 0x80; dat |= 0x80;
udelay(50); udelay(60);
DQ_OUT;
udelay(2);
} }
//spin_unlock(&lock); //spin_unlock(&lock);
return dat; return dat;
@ -125,6 +123,7 @@ void readDs18b20Data(unsigned char *value)
// local_irq_enable(); // local_irq_enable();
mdelay(750); mdelay(750);
//msleep(750);
// local_irq_disable(); // local_irq_disable();
@ -136,11 +135,27 @@ void readDs18b20Data(unsigned char *value)
} }
write_char(0xCC); write_char(0xCC);
write_char(0xBE); write_char(0xBE);
// local_irq_enable();
mutex_unlock(&mutex);
value[0] = read_char(); value[0] = read_char();
value[1] = read_char(); value[1] = read_char();
// local_irq_enable();
mutex_unlock(&mutex);
//printk("%d: TH:%x, TL:%x, c:%x", gpio_num,read_char(),read_char(),read_char());
// mdelay(1);
// init_DS18B20();
//write_char(0xB4);
//DQ_OUT;
//printk("%d: EC:%d", gpio_num,DQ_V);
//write_char(0x4E);
//write_char(0x64);
//write_char(0x00);
//write_char(0x7F);
//init_DS18B20();
//write_char(0x48);
} }
void freeDs18b20(void) void freeDs18b20(void)