main.cpp

00001 #include "mbed.h"
00002 
00003 uint8_t temp_offset = 0xFB;
00004 //uint8_t temp_offset = 0x00;
00005 uint8_t hum_offset = 0x00 ;
00006 
00007 Serial serial ( PA_9 , NC );
00008 
00009 // IES LEDs
00010 DigitalOut led1 ( PB_5 );
00011 DigitalOut led2 ( PB_2 );
00012 DigitalOut led3 ( PH_1 );
00013 
00014 DigitalIn pulse ( PA_2 );
00015 
00016 // I2C conf ( SDA , SCK )
00017 I2C i2c ( PB_9 , PB_8 );
00018 
00019 char i2c_data[1] = { 0 };
00020 char i2c_data2[2] = { 0 , 0 };
00021 char i2c_data4[4] = { 0 , 0 , 0 , 0 };
00022 
00023 const int i2c_addr_read  = 129;
00024 const int i2c_addr_write = 128;
00025 
00026 char conf_reg[1]        = { 0x0E };
00027 char meas_conf_reg[1]   = { 0x0F };
00028 char manf_id_low_reg[1] = { 0xFC };
00029 char temp_max_reg[1]    = { 0x05 };
00030 char temp_low_reg[1]        = { 0x00 };
00031 
00032 char conf_reg_init[2] = { 0x0F , 0x00 };
00033 char meas_conf_reg_init[2] = { 0x0F , 0x00 };
00034 char meas_conf_reg_reset[2] = { 0x0E , 0x80 };
00035 char meas_conf_reg_heat_on[2] = { 0x0E , 0x08 };
00036 char temp_offset_reg[2] = { 0x08 , temp_offset };
00037 
00038 char meas_conf_reg_meas[2] = { 0x0F , 0x01 }; // start_meas: 14bit, t&h , meas
00039 //char meas_conf_reg_meas[2] = { 0x0F , 0x51 }; // start_meas: 11bit, t&h , meas
00040 //char meas_conf_reg_meas[2] = { 0x0F , 0xA1 }; // start_meas: t_8bit, h_8bit , t&h , meas
00041 
00042 // HDC init
00043 void hdc_init ()
00044 {
00045     serial .printf ( "\n\r" );
00046     
00047     //Konfiguracja startowa rejestrów
00048     i2c.write ( i2c_addr_write , conf_reg_init , 2 , false );
00049     i2c.write ( i2c_addr_write , meas_conf_reg_init , 2 , false );
00050     
00051     // Wdrożenie offsetu
00052     i2c.write ( i2c_addr_write , temp_offset_reg , 2 , false );
00053     
00054     //Weryfikacja konfiguracji startowej rejestrów
00055     i2c.write ( i2c_addr_write , conf_reg , 1 , true );
00056     i2c.read ( i2c_addr_read , i2c_data , 1 , false );
00057     serial .printf ( "0x0E Conf. reg.: %X\n\r" , i2c_data[0] );
00058     i2c.write ( i2c_addr_write , meas_conf_reg , 1 , true );
00059     i2c.read ( i2c_addr_read , i2c_data , 1 , false );
00060     serial .printf ( "0x0F Meas conf. reg.: %X\n\r" , i2c_data[0] );
00061     
00062     // Weryfikacja adresu Manf. Id Low
00063     i2c.write ( i2c_addr_write , manf_id_low_reg , 1 , true );
00064     i2c.read ( i2c_addr_read , i2c_data , 1 , false );
00065     serial .printf ( "HDC manf_id_low_reg: %X initiated\n\r" , i2c_data[0] );
00066 }
00067 
00068 void hdc_soft_reset ()
00069 {
00070     serial .printf ( "\n\r" );
00071     // Soft reset
00072     i2c.write ( i2c_addr_write , meas_conf_reg_reset , 2 , false );
00073     // Wait to perform reset
00074     wait ( 1 );
00075     serial .printf ( "Soft reset perfomed\n\r" );
00076 }
00077 
00078 void hdc_heater ( uint8_t t )
00079 {
00080     serial .printf ( "\n\r" );
00081     // Soft reset
00082     i2c.write ( i2c_addr_write , meas_conf_reg_reset , 2 , false );
00083     // Wait to perform reset
00084     wait ( t );
00085     serial .printf ( "Heater switched on for 5s\n\r" );
00086 }
00087 
00088 void hdc_single_acqusition ()
00089 {
00090     i2c.write ( i2c_addr_write , meas_conf_reg_meas , 2 , false );
00091     wait ( 0.2 );
00092     i2c.write ( i2c_addr_write , temp_low_reg , 1 , true );
00093     i2c.read ( i2c_addr_read , i2c_data4 , 4 , false );
00094     //serial .printf ( "HDC Single acquisition raw[hex] 3-0: %X , %X , %X , %X \n\r" , i2c_data4[3] , i2c_data4[2] , i2c_data4[1] , i2c_data4[0] );
00095     double temp = ( i2c_data4 [1] << 8 ) + i2c_data4 [0];
00096     temp = ( ( temp * 165 ) / 65536 ) - 40 ;
00097     serial .printf ( "temp: %f\n\r" , temp );
00098 }
00099 
00100 void hdc_temp_max ()
00101 {
00102     i2c.write ( i2c_addr_write , temp_max_reg , 1 , true );
00103     i2c.read ( i2c_addr_read , i2c_data , 1 , false );
00104     //serial .printf ( "HDC Max temp. raw[hex]: %X\n\r" , i2c_data [0] );
00105     double temp = i2c_data [0];
00106     temp = ( ( temp * 165 ) / 256 ) - 40 ;
00107     serial .printf ( "HDC Max temp. = %f\n\r" , temp );
00108 }
00109 
00110 // Toggle LED
00111 void toggle_led ()
00112 {
00113     serial .printf ( "led toggle\n\r" );
00114     led1 = !led1;
00115     led3 = !led2;
00116     led3 = !led3;
00117 }
00118 
00119 int main() {
00120 
00121     led1 = 0;
00122     led2 = 0;
00123     led3 = 0;
00124     
00125     i2c.frequency ( 1000000 );
00126     
00127     hdc_init () ;
00128     //hdc_soft_reset () ;
00129     //hdc_heater ( 5 );
00130     //hdc_init () ;
00131 
00132     while ( 1 )
00133     {
00134         for ( int i = 0 ; i < 10 ; i++ )
00135         {
00136             hdc_single_acqusition () ;
00137             wait ( 10 ) ;
00138         }
00139         hdc_temp_max () ;
00140     }
00141 }