最后一次优化和调整代码，增加支持keil4的中文注释。

2026-07-07 09:27:09 +08:00
parent fd4305cfbe
commit 7df28fc634
16 changed files with 5352 additions and 0 deletions
@@ -0,0 +1,109 @@
+#include "ds18b20.h"
+
+/*
+ * ????????DS18B20_Reset
+ * ????  ????¦ËDS18B20????????????
+ * ????  ????
+ * ???  ??1=?????0=??????
+ */
+bit DS18B20_Reset(void)
+{
+    unsigned int i;
+    unsigned char presence;
+    
+    DS18B20_DQ = 0;          /* ????????480~960us */
+    for(i=250; i>0; i--);   /* DJNZ???: 250*2=500us */
+    DS18B20_DQ = 1;          /* ????????DS18B20????15~60us??????60~240us */
+    for(i=10; i>0; i--);    /* DJNZ: 10*2=20us, ?????????? */
+    
+    presence = DS18B20_DQ;   /* ???????????(0=?????1=??????) */
+    
+    for(i=200; i>0; i--);   /* DJNZ: 200*2=400us, ????????? */
+    
+    return (presence == 0);  /* ????1?????????????? */
+}
+
+/*
+ * ????????DS18B20_WriteByte
+ * ????  ????DS18B20§Õ????????(LSB????)
+ * ????  ??dat=?§Õ???????
+ * ???  ????
+ */
+void DS18B20_WriteByte(uchar dat)
+{
+    unsigned char i, j;
+
+    for(i=0; i<8; i++)
+    {
+        DS18B20_DQ = 0;     /* ??????????§Õ?? */
+        if(dat & 0x01)      /* §Õ1????????? */
+            DS18B20_DQ = 1;
+        else                /* §Õ0?????????? */
+            DS18B20_DQ = 0;
+        for(j=35; j>0; j--); /* DJNZ: 35*2=70us, ?????>=60us */
+        DS18B20_DQ = 1;     /* ??????? */
+        dat >>= 1;          /* ???¦Ë(LSB first) */
+    }
+}
+
+/*
+ * ????????DS18B20_ReadByte
+ * ????  ????DS18B20?????????(LSB????)
+ * ????  ????
+ * ???  ????????????
+ */
+uchar DS18B20_ReadByte(void)
+{
+    unsigned char i, j, dat = 0;
+
+    for(i=0; i<8; i++)
+    {
+        DS18B20_DQ = 0;     /* ?????????????? */
+        DS18B20_DQ = 1;     /* ??????? */
+        for(j=7; j>0; j--); /* DJNZ: 7*2=14us, ???DS18B20???????(~15us) */
+
+        dat >>= 1;          /* ?????¦Ë */
+        if(DS18B20_DQ)
+            dat |= 0x80;    /* LSB first?????????????¦Ë??????¦Ë */
+
+        for(j=23; j>0; j--); /* DJNZ: 23*2=46us, ?????>=60us */
+    }
+    return dat;
+}
+
+/*
+ * ????????DS18B20_StartConvert
+ * ????  ??????DS18B20??????
+ * ????  ????
+ * ???  ????
+ */
+void DS18B20_StartConvert(void)
+{
+    if(!DS18B20_Reset()) return;    /* ??¦Ë???????? */
+    DS18B20_WriteByte(0xCC);        /* ????ROM */
+    DS18B20_WriteByte(0x44);        /* ????????? */
+}
+
+/*
+ * ????????DS18B20_ReadTemp
+ * ????  ?????DS18B20??????(16¦Ë)
+ * ????  ??temp=??????????????
+ * ???  ??1=????????0=DS18B20¦Ä???
+ */
+bit DS18B20_ReadTemp(int *temp)
+{
+    uchar tempL, tempH;
+    int raw;
+    
+    if(!DS18B20_Reset()) return 0;  /* ??¦Ë???????? */
+    DS18B20_WriteByte(0xCC);        /* ????ROM */
+    DS18B20_WriteByte(0xBE);        /* ??????? */
+    
+    tempL = DS18B20_ReadByte();     /* ?????????? */
+    tempH = DS18B20_ReadByte();     /* ?????????? */
+    
+    raw = (tempH << 8) | tempL;     /* ???16¦Ë???? */
+    *temp = raw;
+    
+    return 1;
+}