Diff: keller_pressure.cpp

Revision:

1:805ee7853062

Parent:

0:fc5c10fc5a05

Child:

2:d6c82c96dae7

Child:

3:1a0add40e308

diff -r fc5c10fc5a05 -r 805ee7853062 keller_pressure.cpp
--- a/keller_pressure.cpp	Tue May 09 21:43:26 2017 +0000
+++ b/keller_pressure.cpp	Wed May 10 16:57:58 2017 +0000
@@ -44,11 +44,11 @@
     status = data[0];
     pressure = (data[1] << 8) | data[2];
     temperature = (data[3] << 8) | data[4];
-    
+
     pressureBAR = ((pressure - 16384)*(pmax-pmin))/32768+pmin;
     pressurePSI = pressureBAR*14.5038;
     pressureKPA = pressureBAR*100;
-    
+
     temperatureC = (temperature - 384)*0.003125-50;
     temperatureF = (temperatureC*1.8+32);
     result = true;
@@ -60,32 +60,47 @@
 void KELLER_PRESSURE::readUserInfo()
 {
     char data[3];
-    //const uint8_t i = NELEMS(data);
-    // _read_multibyte(char regAddress, char* data, char count)
+
     _read_multibyte(KELLER_PRESSURE_CUST_ID0, data, 3);
     Cust_ID0 = (data[1] << 8) | data[2];
 
     _read_multibyte(KELLER_PRESSURE_CUST_ID1, data, 3);
     Cust_ID1 = (data[1] << 8) | data[2];
 
+    // Scaling0 contains date/mode information
     _read_multibyte(KELLER_PRESSURE_SCALING0, data, 3);
     Scaling0 = (data[1] << 8) | data[2];
 
+    union {
+        char c[4];
+        float f;
+    } u;
+
+    //Scaling1 and Scaling2 contain lower pressure limit
     _read_multibyte(KELLER_PRESSURE_SCALING1, data, 3);
     Scaling1 = (data[1] << 8) | data[2];
+    u.c[3] = data[1];
+    u.c[2] = data[2];
 
     _read_multibyte(KELLER_PRESSURE_SCALING2, data, 3);
     Scaling2 = (data[1] << 8) | data[2];
+    u.c[1] = data[1];
+    u.c[0] = data[2];
+    pmin = u.f;
 
+    //Scaling3 and Scaling4 contain upper pressure limit
     _read_multibyte(KELLER_PRESSURE_SCALING3, data, 3);
     Scaling3 = (data[1] << 8) | data[2];
+    u.c[3] = data[1];
+    u.c[2] = data[2];
 
     _read_multibyte(KELLER_PRESSURE_SCALING4, data, 3);
     Scaling4 = (data[1] << 8) | data[2];
+    u.c[1] = data[1];
+    u.c[0] = data[2];
+    pmax = u.f;
 
-    pmin = ((Scaling1 << 16) | Scaling2)/(0xBF800000)*-1.0;
-    pmax = ((Scaling3 << 16) | Scaling4)/(1092616192.0)*10.0;
-
+    // Read out date of manufacture information and sensor mode
     year = ((Scaling0 & KELLER_PRESSURE_SCALING0_YEAR_MASK) >> 11) + 2010;
     month = (Scaling0 & KELLER_PRESSURE_SCALING0_MONTH_MASK) >> 7;
     day = (Scaling0 & KELLER_PRESSURE_SCALING0_DAY_MASK) >> 2;
@@ -136,8 +151,7 @@
     i2c.stop();
 
     //wait_us(500);
-    while (getStatus() != 0x40)
-    {
+    while (getStatus() != 0x40) {
         wait_us(10); // wait until the status bit indicates conversion has completed
     }