Diff: hdc1080.h

Revision:

1:dd3a07b44fe2

Parent:

0:36666c79a60f

--- a/hdc1080.h	Thu Jul 28 02:20:22 2016 +0000
+++ b/hdc1080.h	Wed Sep 14 02:31:15 2016 +0000
@@ -1,70 +1,189 @@
 /*
+  By Joseph Ellsworth CTO of A2WH
+  Take a look at A2WH.com Producing Water from Air using Solar Energy
+  March-2016 License: https://developer.mbed.org/handbook/MIT-Licence
+  Please contact us http://a2wh.com for help with custom design projects.
 
-  See Also: 
+  See Also:
     http://www.ti.com/lit/ds/symlink/hdc1080.pdf
     https://github.com/closedcube/ClosedCube_HDC1080_Arduino/blob/master/src/ClosedCube_HDC1080.cpp
     http://e.pavlin.si/2016/06/04/hdlc-like-data-link-via-rs485/
+*/
 
-*/
+/**
+#include "mbed.h"
+#include <stdint.h>
+
+//Pin Defines for I2C Bus
+#define D_SDA                  PB_7 // specific for Nucleo-F303K8
+#define D_SCL                  PB_6 // specific for Nucleo-F303K8
+I2C hdc_i2c(D_SDA, D_SCL);
+#include "hdc1080.h"
+
+// Host PC Communication channels
+Serial pc(USBTX, USBRX); // tx, rx
+DigitalOut myled(LED1);
+
+int main()
+{
+    pc.baud(9600);
+    while(1) {
+        printf("\r\\nHDC1080 Test\r\n");
+        myled = !myled;
+        hdc_begin();
+        uint16_t manId = hdc_readManufactId();
+        float tempC = hdc_readTemp();     
+        float humid = hdc_readHumid();  
+        unsigned long  serNum = hdc_readSerial();
+        printf("manId=x%x, tempC=%0.3f humid=%0.3f serfNum=%ld\r\n",
+          manId, tempC, humid, serNum);
+        wait(3.0f);
+    }
+}
+**/
+
+
 
 #ifndef hdc1080_h
 #define hdc1080_h
 #include "mbed.h"
 
-   #define hdc_chip_addr (0x40 << 1) // Page #8.5.1.1 - 1000000
-     // left shift 1 bit for 7 bit address required by
-     // I2C library
-   //#define hdc_chip_addr 0x40 // Page #8.5.1.1 - 1000000     
-   const int off_temp  = 0x00;
-   const int off_humid_off = 0x01;
-   const int off_config = 0x02;
-   const int off_man_id = 0xFE;
-   const int off_serial_first = 0xFB;
-   const int off_serial_mid = 0xFC;
-   const int off_serial_last = 0xFD;
-   char comm = off_man_id;
- 
-   char hdc_buff[10];
-   
-//I2C i2c(D4,D5);   
-   
-void hdc_begin() {
-  printf("hdc_begin\r\n");
-  memset(hdc_buff,0,3);
-  hdc_buff[0] = off_config;
-  int res = i2c.write(hdc_chip_addr, hdc_buff, 2);
-  printf("hdc_begin write res=%d\r\n", res);  
+#define hdc_chip_addr (0x40 << 1) // Page #8.5.1.1 - 1000000
+// left shift 1 bit for 7 bit address required by
+// I2C library
+//#define hdc_chip_addr 0x40 // Page #8.5.1.1 - 1000000
+const int hdc_off_temp  = 0x00;
+const int hdc_off_humid = 0x01;
+const int hdc_off_config = 0x02;
+const int hdc_off_man_id = 0xFE;
+const int hdc_off_serial_first = 0xFB;
+const int hdc_off_serial_mid = 0xFC;
+const int hdc_off_serial_last = 0xFD;
+char hdc_comm = hdc_off_man_id;
+const float hdc_chip_error = -255;
+const unsigned long hdc_chip_err_l = 0;
+char hdc_buff[5];
+
+void hdc_begin()
+{
+    //printf("hdc_begin\r\n");
+    memset(hdc_buff,0,3);
+    hdc_buff[0] = hdc_off_config;
+    int res = hdc_i2c.write(hdc_chip_addr, hdc_buff, 2);
+    #ifdef DEBUG3
+    printf("hdc_begin write res=%d\r\n", res);
+    #endif
 }
-    
-float hdc_readTemp() {
-  printf("hdc_readTemp()\r\n");  
-  memset(hdc_buff,0,3);
-  hdc_buff[0] = off_temp;
-  int res = i2c.write(hdc_chip_addr, hdc_buff, 1);
-  printf("write res=%d\r\n", res);  
-  wait(0.015);
-  memset(hdc_buff,0,3);  
-  res = i2c.read(hdc_chip_addr, hdc_buff,2);    
-  printf("read res=%d hdc_buff [0]=%d  [1]=%d\r\n", res, (int) hdc_buff[0], (int) hdc_buff[1]);  
+
+uint16_t hdc_readData16(int chip_addr, int offset)
+{
+    memset(hdc_buff,0,3);
+    // send chip address onto buss
+    hdc_buff[0] = offset;
+    int res = hdc_i2c.write(chip_addr, hdc_buff, 1);
+    if (res != 0) {
+        #ifdef DEBUG3
+        printf("error talking to chip %d offst=%d\r\n", chip_addr, offset);
+        #endif
+        return 0;
+    }
+    // read data from chip
+    wait(0.015);
+    memset(hdc_buff,0,3);
+    res = hdc_i2c.read(hdc_chip_addr, hdc_buff,2);
+    if (res != 0) {
+        #ifdef DEBUG3
+        printf("error reading chip %d offst=%d\r\n", chip_addr, offset);
+        #endif
+        return 0;
+    }
+    return  hdc_buff[0] << 8 | hdc_buff[1];
 }
 
-float hdc_readHumid() {
-    
+/* Read temperature from hdc_1080 chip.  Returns float
+containing the Celcius temperature or hdc_chip_error if
+error occurs reading the sensor */
+float hdc_readTemp()
+{
+    uint16_t  rawT = hdc_readData16(hdc_chip_addr, hdc_off_temp);
+    if (rawT == 0) {
+        #ifdef DEBUG3
+        printf("error reading hdc chip temp\r\n");
+        #endif
+        return hdc_chip_error;
+    } else {
+        float temp = ((float) rawT / pow(2.0f, 16.0f)) * 165.0f - 40.0f;
+        #ifdef DEBUG3
+        printf("temp=%0.3f\r\n", temp);
+        #endif
+        return temp;
+    }
+}
+
+/* Read humidity from hdc_1080 chip.  Returns a float
+containing the humidity or hdc_chip_error if error 
+occurs reading the sensor */
+float hdc_readHumid()
+{
+    uint16_t  rawH = hdc_readData16(hdc_chip_addr, hdc_off_humid);
+    if (rawH == 0) {
+        #ifdef DEBUG3
+        printf("error reading hdc chip humid\r\n");
+        #endif
+        return hdc_chip_error;
+    } else {
+        float humid = ((float) rawH / pow(2.0f, 16.0f)) * 100.0f;
+        #ifdef DEBUG3
+        printf("humid humid=%0.3f\r\n", humid);
+        #endif
+        return humid;
+    }
 }
 
-float hdc_readManufactId() {
-  printf("hdc_readManufactId()\r\n");
-  wait(0.015);
-  memset(hdc_buff,0,3);
-  hdc_buff[0] = off_man_id;
-  int res = i2c.write(hdc_chip_addr, hdc_buff, 1);  
-  printf("write res=%d\r\n", res);
-  
-  wait(0.015);
-  memset(hdc_buff,0,3);  
-  res = i2c.read(hdc_chip_addr, hdc_buff,2);    
-  printf("read res=%d hdc_buff [0]=%d  [1]=%d\r\n", res, (int) hdc_buff[0], (int) hdc_buff[1]);
-  
+int hdc_readManufactId()
+{   
+    uint16_t  rawid = hdc_readData16(hdc_chip_addr, hdc_off_man_id);
+    if (rawid == 0) {
+        #ifdef DEBUG3
+        printf("error reading hdc chip manId\r\n");
+        #endif
+        return (int) hdc_chip_error;
+    } else {  
+        #ifdef DEBUG3      
+        printf("man id=%x\r\n", (int) rawid);
+        #endif
+        return rawid;
+    }    
+}
+
+unsigned long hdc_readSerial()
+{    
+    wait(0.015);
+    memset(hdc_buff,0,4);
+    hdc_buff[0] = hdc_off_man_id;
+    int res = hdc_i2c.write(hdc_chip_addr, hdc_buff, 1);
+    if (res != 0) {      
+      #ifdef DEBUG3
+      printf("Error writing chip addr res=%d\r\n", res);
+      #endif
+      return (unsigned long) hdc_chip_err_l;
+    }      
+
+    wait(0.015);
+    memset(hdc_buff,0,4);
+    res = hdc_i2c.read(hdc_chip_addr, hdc_buff,4);
+    if (res != 0) {
+      #ifdef DEBUG3
+      printf("Errot reading chip serial res=%d#\r\n", res);
+      #endif
+      return (unsigned long) hdc_chip_err_l;
+    }
+      
+    unsigned long rawser = hdc_buff[0] << 16 | hdc_buff[1] << 8 | hdc_buff[0];
+    #ifdef DEBUG3
+    printf("ser=%lu\r\n", rawser);
+    #endif
+    return rawser;
 }
 
 #endif