Diff: main.cpp

Revision:

0:00e87008c034

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Apr 06 13:43:42 2015 +0000
@@ -0,0 +1,57 @@
+/***********************************************************************
+* Read temperature by using DS1617
+* read external diode temp. between DXP/DXN pin
+* read on-chip temperature
+* if changed then serial out
+* end
+* tested on nucleo-F401
+************************************************************************/
+
+#include "mbed.h"
+
+
+#define MAX1617_RIT (0x00)  // internal temperature register
+#define MAX1617_RET (0x01)  // external, (diode dxp-dxn)temperature register
+#define MAX1617_ADDR (0x30) // MAX1617 address (ADD0=0  ADD1=0)
+#define MAX1617_OSHT (0x0F) // MAX1617 one shot temperature read command, both channels
+
+
+I2C i2c(I2C_SDA, I2C_SCL);
+
+DigitalOut myled(LED1);
+
+Serial pc(SERIAL_TX, SERIAL_RX);
+
+int main()
+{
+   
+    char data_read_1[1];    //temp extread holder
+    char data_read_2[1];    //temp read holder
+    int rispold_1=0;
+    int rispold_2=0;
+
+   
+    while (1) {
+       char command_one_shot[1] = {MAX1617_OSHT};
+       char command_ext_temp[1] = {MAX1617_RET};
+       char command_int_temp[1] = {MAX1617_RIT};
+        //I2C transactions
+        i2c.write(MAX1617_ADDR, command_one_shot , 1, 0); // no stop  //one shot temp read
+        i2c.write(MAX1617_ADDR, command_ext_temp, 1, 1); // no stop   //ext temp read
+        i2c.read(MAX1617_ADDR, data_read_1, 1, 0);
+        i2c.write(MAX1617_ADDR, command_int_temp, 1, 1); // no stop   //int temp read
+        i2c.read(MAX1617_ADDR, data_read_2, 1, 0);
+        
+        //
+        int risp1 = (int)data_read_1[0];
+        int risp2 = (int)data_read_2[0];
+        if ((risp1 != rispold_1)|(risp2 != rispold_2))
+          pc.printf("temp int = %d\n",  risp2);
+           pc.printf("temp ext = %d\n",  risp1);
+        rispold_1 = risp1;
+        rispold_2 = risp2;
+        myled = !myled;
+        wait(0.3);
+    }
+
+}
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