shuixx/ds18b20
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shuixx 2019-06-09 15:00:27 +08:00
parent d06b2e9d14
commit e9ca82542c
2 changed files with 28 additions and 11 deletions
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12
dev.sh Executable file
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@ -0,0 +1,12 @@
#!/bin/sh
if [ -n "$1" ];then
rmmod ds18b20_224
make -j 2
insmod ds18b20_224.ko
sleep 2
fi
for i in `seq 1 10`
do
show-temp
done

23
ds18b20.c
View File

@ -27,14 +27,14 @@ int init_DS18B20(void)
unsigned int result; unsigned int result;
DQ_OUT; DQ_OUT;
DQ_L; DQ_L;
udelay(480); //480~960 udelay(480);
DQ_H; DQ_H;
udelay(15); //15-60
DQ_IN; DQ_IN;
udelay(60);//60-240 udelay(65);
result = DQ_V; result = DQ_V;
udelay(405); udelay(240);
printk("ds18b20 init result %d", result); printk("ds18b20 init result %d,%d", result, DQ_V);
udelay(180);
return result; return result;
} }
@ -53,7 +53,7 @@ unsigned char read_char(void)
udelay(2); udelay(2);
dat >>= 1; dat >>= 1;
DQ_IN; DQ_IN;
udelay(15); udelay(12);
if (DQ_V) if (DQ_V)
dat |= 0x80; dat |= 0x80;
udelay(50); udelay(50);
@ -103,6 +103,14 @@ int initDs18b20(unsigned int gpioNum)
/*读取数据*/ /*读取数据*/
void readDs18b20Data(unsigned char *value) void readDs18b20Data(unsigned char *value)
{ {
if (sizeof(&value) > 1){
value[0] = 0xff;
value[1] = 0xff;
}
else
{
return;
}
if (init_DS18B20()) if (init_DS18B20())
{ {
return; return;
@ -119,12 +127,9 @@ void readDs18b20Data(unsigned char *value)
write_char(0xCC); write_char(0xCC);
write_char(0xBE); write_char(0xBE);
if (sizeof(&value) > 1)
{
value[0] = read_char(); value[0] = read_char();
value[1] = read_char(); value[1] = read_char();
} }
}
void freeDs18b20(void) void freeDs18b20(void)
{ {