Diff: DS1621.cpp

Revision:

0:4be500de690c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DS1621.cpp	Tue Mar 20 02:09:21 2018 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+
+//Serial pc2(USBTX, USBRX);
+I2C i2cTem(PB_9, PB_8); //i2c device constructor
+//9E = 1001 1110
+const int addr = 0x90;          //8 bit (addr|0) - all config bits=0 (floating)
+                                                        //First 4 bits are 1001 (set by manufacturer)
+int* ReadDS1621(void)
+{
+    char cmd[2];        // command buffer (re-usable)
+    static int data[2] = {0, 0};      //data being read
+        // AC = 1010 1100
+    cmd[0] = 0xAC;
+    i2cTem.write(addr, cmd, 1, false); // Access Config
+        // 02 = 0000 0010
+    cmd[0] = 0x02;  // 2 = continuous convert, POL=1
+    i2cTem.write(addr, cmd, 1, false); //continuous conversions
+        //pc2.printf("start %i:%i\n",(int)cmd[0],(int)cmd[1]);
+    wait_ms(20);    // allow time for ee write  
+        // EE = 1110 1110
+    cmd[0] = 0xEE;  //238=start conversions - needs 10ms delay
+    i2cTem.write(addr, cmd, 1, false); //try sending stop
+        //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
+    wait_ms(20);  //20ms
+        // AA = 1010 1010
+    cmd[0] = 0xAA;  //to issue 'Read temp'
+    i2cTem.write(addr, cmd, 1, false);
+        //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
+    i2cTem.read(addr, cmd, 2, false);  
+        //pc2.printf("%i:%i\n",(int)cmd[0],(int)cmd[1]);
+        data[0] = (int)cmd[0]; 
+        data[1] = (int)cmd[1];
+      return (int*)data;
+}