Diff: ds1621.cpp

Revision:

0:d1667b4536dd

Child:

1:bef707045d41

diff -r 000000000000 -r d1667b4536dd ds1621.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ds1621.cpp	Sat Mar 05 20:35:01 2011 +0000
@@ -0,0 +1,39 @@
+/***********************************************************
+Author: Dupuy Bruno
+Date: 5 mars 2001
+Version: beta
+************************************************************/
+#include "ds1621.h"
+
+DS1621::DS1621(I2C* interface, uint8_t address, Serial* pc) {
+    if (dbx) dbx->printf("Constructor DS1621\n\r");
+    i2c = interface;
+    dbx = pc;
+}
+
+float DS1621::getTemp(uint8_t address) { // Return degrees C (-55 to +125)
+    if (dbx) dbx->printf("DS1621::getTemp DS1621 address=0x%X\n\r",address);
+    float temperature;
+    uint16_t temp16;
+    char temp8[2];
+    int8_t data;
+    address &= 0x0E;
+    data = 0xEE;
+    i2c->write(DS1621_Write|address,(char *)&data,sizeof(data));
+    data = 0xAA;
+    i2c->write(DS1621_Write|address,(char *)&data,sizeof(data));
+    i2c->read(DS1621_Read|address, temp8 ,sizeof(temp8), false);
+    // Format temperature
+    temp16 = temp8[0];
+    temp16 = temp16 << 1;
+    temp16 = temp16 + (temp8[1] >> 7);
+    if ((temp16 & 0x100) == 0) { // +
+        temperature = ((float) temp16 / 2);
+    } else {  // -
+        temp16 = ~temp16 & 0xFF;
+        temperature = ((float) temp16 / 2);
+        temperature = -1.0 * temperature;
+    }
+    if (dbx)  dbx->printf("temp8[0]=0x%X, temp8[1]=0x%X, temp16=0x%X\n\r",temp8[0],temp8[1],temp16);
+    return temperature;
+}
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