Diff: main.cpp

Revision:

1:3baecb064743

Parent:

0:80fb3c4621be

diff -r 80fb3c4621be -r 3baecb064743 main.cpp
--- a/main.cpp	Tue Oct 23 19:39:34 2018 +0000
+++ b/main.cpp	Mon Nov 05 14:17:14 2018 +0000
@@ -15,8 +15,8 @@
 // Note MCP9808 also needs VCC (3.3 V) and GND
 
 float TempValue;
-float data[20];
-char data_write[3], data_read[2];
+float data[20],data_f[20];
+char data_write[3], data_read[2],data_write_crit_temp[3];
 int ii, status;
 int main() {
     char text[128];
@@ -32,12 +32,21 @@
     // Wake up
     data_write[0] = MCP9808_REG_CONF; // Register address
     data_write[1] = 0x00;  // Data MSB, b11-15 not used, b9-10 =>T_HYS=0, b8 => continuous conversions
-    data_write[2] = 0x04;  // Data LSB,  Alert Off, Alert Disabled, Alert T>T_Crit, Alert active low, Alert interrupt
+    data_write[2] = 0x1E;  // Data LSB,  Alert Off, Alert Disabled, Alert T>T_Crit, Alert active low, Alert interrupt
     status = i2c.write(MCP9808_ADDR, data_write, 3, 0); // address,data,length,repeat
     // address is chip addess
     // First byte of data has register address 
     // repeat true for multiple write when the chip autoincrements the address
     // MCP9808 does not do this, so we leave it at 0
+    
+    // Now we set the critical temperature
+    data_write_crit_temp[0] = MCP9808_REG_CRIT;
+    data_write_crit_temp[1] = 0x01;
+    data_write_crit_temp[2] = 0xB0;
+    status = i2c.write(MCP9808_ADDR, data_write_crit_temp, 3, 0);
+    
+    
+    
       
     while(1){
         int i=0;
@@ -50,14 +59,15 @@
             i2c.read(MCP9808_ADDR, data_read, 2, 0);
             status = data_read[0] >> 5;  // Shift flags to b0-b2
             // 1 in flag means: T>T_crit(b2), T>T_Upper(b1), T<T_Lower(b0)
-           // pc.printf("the status is %n",status);
+            pc.printf("the status is %X\n\r",status);
             data_read[0] = data_read[0] & 0x1F;  // clear flag bits for temperature
             
             data[i] = (data_read[0] * 16) + (data_read[1] / 16.0); // combine two bytes
+            data_f[i] = (data[i]+40)*9/5-40;
             // Display the flags, if you wish
             // pc.printf("Flags are %i \n\r",status);
             // This displays to the user
-            pc.printf("%i Temperature is %3.1f\n\r",i,data[i]);
+            pc.printf("%i Temperature is %3.1f C and %3.1f F\n\r",i,data[i],data_f[i]);
             i=i+1;
             wait(1);
         }