Revision 2:7cf2ef9c51da, committed 2016-07-28

Comitter:

thursday1024

Date:

Thu Jul 28 22:55:30 2016 +0000

Parent:

1:3c8fcecce568

Commit message:

BME280 I2C

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BME280.cpp	Thu Jul 28 22:55:30 2016 +0000
@@ -0,0 +1,193 @@
+/**
+ *  BME280 Combined humidity and pressure sensor library
+ *
+ *  @author  Toyomasa Watarai
+ *  @version 1.0
+ *  @date    06-April-2015
+ *
+ *  Library for "BME280 temperature, humidity and pressure sensor module" from Switch Science
+ *    https://www.switch-science.com/catalog/2236/
+ *
+ *  For more information about the BME280:
+ *    http://ae-bst.resource.bosch.com/media/products/dokumente/bme280/BST-BME280_DS001-10.pdf
+ */
+
+#include "mbed.h"
+#include "BME280.h"
+
+BME280::BME280(PinName sda, PinName scl, char slave_adr)
+    :
+    i2c_p(new I2C(sda, scl)), 
+    i2c(*i2c_p),
+    address(slave_adr),
+    t_fine(0)
+{
+    initialize();
+}
+
+BME280::BME280(I2C &i2c_obj, char slave_adr)
+    :
+    i2c_p(NULL), 
+    i2c(i2c_obj),
+    address(slave_adr),
+    t_fine(0)
+{
+    initialize();
+}
+
+BME280::~BME280()
+{
+    if (NULL != i2c_p)
+        delete  i2c_p;
+}
+    
+void BME280::initialize()
+{
+    char cmd[18];
+ 
+    cmd[0] = 0xf2; // ctrl_hum
+    cmd[1] = 0x01; // Humidity oversampling x1
+    i2c.write(address, cmd, 2);
+ 
+    cmd[0] = 0xf4; // ctrl_meas
+    cmd[1] = 0x27; // Temparature oversampling x1, Pressure oversampling x1, Normal mode
+    i2c.write(address, cmd, 2);
+ 
+    cmd[0] = 0xf5; // config
+    cmd[1] = 0xa0; // Standby 1000ms, Filter off
+    i2c.write(address, cmd, 2);
+ 
+    cmd[0] = 0x88; // read dig_T regs
+    i2c.write(address, cmd, 1);
+    i2c.read(address, cmd, 6);
+ 
+    dig_T1 = (cmd[1] << 8) | cmd[0];
+    dig_T2 = (cmd[3] << 8) | cmd[2];
+    dig_T3 = (cmd[5] << 8) | cmd[4];
+ 
+    DEBUG_PRINT("dig_T = 0x%x, 0x%x, 0x%x\n", dig_T1, dig_T2, dig_T3);
+ 
+    cmd[0] = 0x8E; // read dig_P regs
+    i2c.write(address, cmd, 1);
+    i2c.read(address, cmd, 18);
+ 
+    dig_P1 = (cmd[ 1] << 8) | cmd[ 0];
+    dig_P2 = (cmd[ 3] << 8) | cmd[ 2];
+    dig_P3 = (cmd[ 5] << 8) | cmd[ 4];
+    dig_P4 = (cmd[ 7] << 8) | cmd[ 6];
+    dig_P5 = (cmd[ 9] << 8) | cmd[ 8];
+    dig_P6 = (cmd[11] << 8) | cmd[10];
+    dig_P7 = (cmd[13] << 8) | cmd[12];
+    dig_P8 = (cmd[15] << 8) | cmd[14];
+    dig_P9 = (cmd[17] << 8) | cmd[16];
+ 
+    DEBUG_PRINT("dig_P = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_P1, dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9);
+ 
+    cmd[0] = 0xA1; // read dig_H regs
+    i2c.write(address, cmd, 1);
+    i2c.read(address, cmd, 1);
+     cmd[1] = 0xE1; // read dig_H regs
+    i2c.write(address, &cmd[1], 1);
+    i2c.read(address, &cmd[1], 7);
+
+    dig_H1 = cmd[0];
+    dig_H2 = (cmd[2] << 8) | cmd[1];
+    dig_H3 = cmd[3];
+    dig_H4 = (cmd[4] << 4) | (cmd[5] & 0x0f);
+    dig_H5 = (cmd[6] << 4) | ((cmd[5]>>4) & 0x0f);
+    dig_H6 = cmd[7];
+ 
+    DEBUG_PRINT("dig_H = 0x%x, 0x%x, 0x%x, 0x%x, 0x%x, 0x%x\n", dig_H1, dig_H2, dig_H3, dig_H4, dig_H5, dig_H6);
+}
+ 
+float BME280::getTemperature()
+{
+    uint32_t temp_raw;
+    float tempf;
+    char cmd[4];
+ 
+    cmd[0] = 0xfa; // temp_msb
+    i2c.write(address, cmd, 1);
+    i2c.read(address, &cmd[1], 3);
+ 
+    temp_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
+ 
+    int32_t temp;
+ 
+    temp =
+        (((((temp_raw >> 3) - (dig_T1 << 1))) * dig_T2) >> 11) +
+        ((((((temp_raw >> 4) - dig_T1) * ((temp_raw >> 4) - dig_T1)) >> 12) * dig_T3) >> 14);
+ 
+    t_fine = temp;
+    temp = (temp * 5 + 128) >> 8;
+    tempf = (float)temp;
+ 
+    return (tempf/100.0f);
+}
+ 
+float BME280::getPressure()
+{
+    uint32_t press_raw;
+    float pressf;
+    char cmd[4];
+ 
+    cmd[0] = 0xf7; // press_msb
+    i2c.write(address, cmd, 1);
+    i2c.read(address, &cmd[1], 3);
+ 
+    press_raw = (cmd[1] << 12) | (cmd[2] << 4) | (cmd[3] >> 4);
+ 
+    int32_t var1, var2;
+    uint32_t press;
+ 
+    var1 = (t_fine >> 1) - 64000;
+    var2 = (((var1 >> 2) * (var1 >> 2)) >> 11) * dig_P6;
+    var2 = var2 + ((var1 * dig_P5) << 1);
+    var2 = (var2 >> 2) + (dig_P4 << 16);
+    var1 = (((dig_P3 * (((var1 >> 2)*(var1 >> 2)) >> 13)) >> 3) + ((dig_P2 * var1) >> 1)) >> 18;
+    var1 = ((32768 + var1) * dig_P1) >> 15;
+    if (var1 == 0) {
+        return 0;
+    }
+    press = (((1048576 - press_raw) - (var2 >> 12))) * 3125;
+    if(press < 0x80000000) {
+        press = (press << 1) / var1;
+    } else {
+        press = (press / var1) * 2;
+    }
+    var1 = ((int32_t)dig_P9 * ((int32_t)(((press >> 3) * (press >> 3)) >> 13))) >> 12;
+    var2 = (((int32_t)(press >> 2)) * (int32_t)dig_P8) >> 13;
+    press = (press + ((var1 + var2 + dig_P7) >> 4));
+ 
+    pressf = (float)press;
+    return (pressf/100.0f);
+}
+ 
+float BME280::getHumidity()
+{
+    uint32_t hum_raw;
+    float humf;
+    char cmd[4];
+ 
+    cmd[0] = 0xfd; // hum_msb
+    i2c.write(address, cmd, 1);
+    i2c.read(address, &cmd[1], 2);
+ 
+    hum_raw = (cmd[1] << 8) | cmd[2];
+ 
+    int32_t v_x1;
+ 
+    v_x1 = t_fine - 76800;
+    v_x1 =  (((((hum_raw << 14) -(((int32_t)dig_H4) << 20) - (((int32_t)dig_H5) * v_x1)) +
+               ((int32_t)16384)) >> 15) * (((((((v_x1 * (int32_t)dig_H6) >> 10) *
+                                            (((v_x1 * ((int32_t)dig_H3)) >> 11) + 32768)) >> 10) + 2097152) *
+                                            (int32_t)dig_H2 + 8192) >> 14));
+    v_x1 = (v_x1 - (((((v_x1 >> 15) * (v_x1 >> 15)) >> 7) * (int32_t)dig_H1) >> 4));
+    v_x1 = (v_x1 < 0 ? 0 : v_x1);
+    v_x1 = (v_x1 > 419430400 ? 419430400 : v_x1);
+ 
+    humf = (float)(v_x1 >> 12);
+ 
+    return (humf/1024.0f);
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/BME280.h	Thu Jul 28 22:55:30 2016 +0000
@@ -0,0 +1,102 @@
+/**
+ *  BME280 Combined humidity and pressure sensor library
+ *
+ *  @author  Toyomasa Watarai
+ *  @version 1.0
+ *  @date    06-April-2015
+ *
+ *  Library for "BME280 temperature, humidity and pressure sensor module" from Switch Science
+ *    https://www.switch-science.com/catalog/2236/
+ *
+ *  For more information about the BME280:
+ *    http://ae-bst.resource.bosch.com/media/products/dokumente/bme280/BST-BME280_DS001-10.pdf
+ */
+ 
+#ifndef MBED_BME280_H
+#define MBED_BME280_H
+
+#include "mbed.h"
+
+//#define _DEBUG
+#define DEFAULT_SLAVE_ADDRESS (0x76 << 1)
+
+#ifdef _DEBUG
+extern Serial pc;
+#define DEBUG_PRINT(...) pc.printf(__VA_ARGS__)
+#else
+#define DEBUG_PRINT(...)
+#endif
+
+ 
+/** BME280 class
+ *
+ *  BME280: A library to correct environmental data using Boshe BME280 device
+ *
+ *  BME280 is an environmental sensor
+ *  @endcode
+ */
+ 
+class BME280
+{
+public:
+
+    /** Create a BME280 instance
+     *  which is connected to specified I2C pins with specified address
+     *
+     * @param sda I2C-bus SDA pin
+     * @param scl I2C-bus SCL pin
+     * @param slave_adr (option) I2C-bus address (default: 0x76)
+     */
+    BME280(PinName sda, PinName sck, char slave_adr = DEFAULT_SLAVE_ADDRESS);
+
+    /** Create a BME280 instance
+     *  which is connected to specified I2C pins with specified address
+     *
+     * @param i2c_obj I2C object (instance)
+     * @param slave_adr (option) I2C-bus address (default: 0x76)
+     */
+    BME280(I2C &i2c_obj, char slave_adr = DEFAULT_SLAVE_ADDRESS);
+
+    /** Destructor of BME280
+     */
+    virtual ~BME280();
+
+    /** Initializa BME280 sensor
+     *
+     *  Configure sensor setting and read parameters for calibration
+     *
+     */
+    void initialize(void);
+
+    /** Read the current temperature value (degree Celsius) from BME280 sensor
+     *
+     */
+    float getTemperature(void);
+
+    /** Read the current pressure value (hectopascal)from BME280 sensor
+     *
+     */
+    float getPressure(void);
+
+    /** Read the current humidity value (humidity %) from BME280 sensor
+     *
+     */
+    float getHumidity(void);
+
+private:
+
+    I2C         *i2c_p;
+    I2C         &i2c;
+    char        address;
+    uint16_t    dig_T1;
+    int16_t     dig_T2, dig_T3;
+    uint16_t    dig_P1;
+    int16_t     dig_P2, dig_P3, dig_P4, dig_P5, dig_P6, dig_P7, dig_P8, dig_P9;
+    uint16_t    dig_H1, dig_H3;
+    int16_t     dig_H2, dig_H4, dig_H5, dig_H6;
+    int32_t     t_fine;
+
+};
+
+#endif // MBED_BME280_H
+

--- a/main.cpp	Thu Jul 30 07:29:17 2015 +0000
+++ b/main.cpp	Thu Jul 28 22:55:30 2016 +0000
@@ -1,70 +1,104 @@
-// php_acces main.cpp
- 
-#include "mbed.h" 
-#include "EthernetInterface.h"
-#include "HTTPClient.h"
-#define BUFF_SIZE 128
-
-extern void php_access_main( char *uri, char *ch_name, int* sp );
-char php_uri[]="https://alpha.c.dendai.ac.jp/plot/save_data.php"; 
-
-char ch_str[] ="ch13894";
-
-extern HTTPClient http;
-EthernetInterface eth;
-
-static int speed=0;
-void thread_main( void const *av ){
-    char ch_name[BUFF_SIZE];
-    strcpy( ch_name, ch_str );
-    printf( "Channel Name:%s\n", ch_name );
-    
-    php_access_main( php_uri, ch_name, &speed ); // 
-    
-    while(true) Thread::wait(1000);
-}
-
-// memo
-// R-LED -> LED1; G-LED -> LED2; B-LED -> LED3;
-// sw3 -> PTA4; sw2 -> PTC6;
-
-DigitalOut my_LED0(LED1);
-DigitalOut my_LED1(LED3);
-DigitalOut my_LED2(LED2);
-DigitalIn  my_sw0(PTA4); 
-DigitalIn  my_sw1(PTC6); 
-
-int main() {
-    my_LED0=1;
-    my_LED1=1;
-    Timer t;
-    t.start();
-    
-    int ret = eth.init(); //Use DHCP
-    printf( "php_test Starting,...\n" ) ;
-    while(1) {
-        ret = eth.connect();
-        if( ret==0 )break ; // DHCP OK
-        Thread::wait( 100 );
-    }
-    t.stop();
-    srand(t.read_ms());
-
-    printf( "IP = %s\n", eth.getIPAddress() );
-    
-    #define STACK_SIZE 20000
-    Thread thr( thread_main, NULL, osPriorityNormal, STACK_SIZE );
-    speed=0;
-    int i=0;
-    while(true){
-        if(!my_sw0 && speed<=0)speed++;
-        if(!my_sw1 && speed>=0)speed--;
-        if(speed>0 ){my_LED0=0;my_LED1=1;my_LED2=1;}
-        if(speed<0 ){my_LED0=1;my_LED1=0;my_LED2=1;}
-        if(speed==0){my_LED0=1;my_LED1=1;my_LED2=0;}
-        speed = (rand()%3)-1;
-        Thread::wait(1000);
-        i++;
-    }
-}
-
+// php_acces main.cpp
+  
+#include "mbed.h" 
+#include "BME280.h"
+#include "EthernetInterface.h"
+#include "HTTPClient.h"
+#define BUFF_SIZE 128
+
+extern void php_access_main( char *uri, char *ch_name, int* sp );
+char php_uri[]="https://alpha.c.dendai.ac.jp/plot/save_data.php"; 
+
+//char ch_str[] ="ch13894";
+char ch_str[] ="ch1389400";
+
+
+extern HTTPClient http;
+EthernetInterface eth;
+
+static int speed=0;
+void thread_main( void const *av ){
+    char ch_name[BUFF_SIZE];
+    strcpy( ch_name, ch_str );
+    printf( "Channel Name:%s\n", ch_name );
+    
+    php_access_main( php_uri, ch_name, &speed ); // 
+    
+    while(true) Thread::wait(1000);
+}
+
+// memo
+// R-LED -> LED1; G-LED -> LED2; B-LED -> LED3;
+// sw3 -> PTA4; sw2 -> PTC6;
+
+DigitalOut my_LED0(LED1);
+DigitalOut my_LED1(LED3);
+DigitalOut my_LED2(LED2);
+DigitalIn  my_sw0(PTA4); 
+DigitalIn  my_sw1(PTC6); 
+
+#if defined(TARGET_LPC1768)
+BME280 sensor(p28, p27);
+#else
+BME280 sensor(I2C_SDA, I2C_SCL);
+#endif
+
+int main() {
+
+    
+    //while(1) {
+    //    printf("hoge test = %2.2f degC, %04.2f hPa, %2.2f %%\n", sensor.getTemperature(), sensor.getPressure(), sensor.getHumidity());
+    //    wait(1);
+    //}
+
+
+    
+    
+    
+    my_LED0=1;
+    my_LED1=1;
+    Timer t;
+    t.start();
+    
+    int ret = eth.init(); //Use DHCP
+    printf( "php_test Starting,...\n" ) ;
+    while(1) {
+        ret = eth.connect();
+        if( ret==0 )break ; // DHCP OK
+        Thread::wait( 100 );
+    }
+    t.stop();
+    srand(t.read_ms());
+
+    printf( "IP = %s\n", eth.getIPAddress() );
+    
+    #define STACK_SIZE 20000
+    Thread thr( thread_main, NULL, osPriorityNormal, STACK_SIZE );
+    speed=0;
+    int i=0;
+    //double tmp;
+    while(true){
+        speed = sensor.getTemperature()*100, 
+
+/*        printf("hoge test = %2.2f degC, %04.2f hPa, %2.2f %%\n", 
+            tmp, 
+            sensor.getPressure(), 
+            sensor.getHumidity());
+        speed = tmp*100;
+*/    
+  
+        
+/*        if(!my_sw0 && speed<=0)speed++;
+        if(!my_sw1 && speed>=0)speed--;
+        if(speed>0 ){my_LED0=0;my_LED1=1;my_LED2=1;}
+        if(speed<0 ){my_LED0=1;my_LED1=0;my_LED2=1;}
+        if(speed==0){my_LED0=1;my_LED1=1;my_LED2=0;}
+        speed = (rand()%3)-1;
+*/      
+      
+        Thread::wait(1000);
+        i++;
+    }
+}
+
+

--- a/php_access.cpp	Thu Jul 30 07:29:17 2015 +0000
+++ b/php_access.cpp	Thu Jul 28 22:55:30 2016 +0000
@@ -24,7 +24,7 @@
         HTTPMap params;
         HTTPText inText( buff, BUFFSIZE );
         
-        sprintf( str, "%d", j+=*sp );
+        sprintf( str, "%.2f", (*sp)/100.0 );
         params.put("data", str );
         params.put("ch", ch_name );
         char str_sp[128]; sprintf( str_sp, "%d", *sp );