main.cpp

00001 #include "mbed.h"
00002 #include "Hexi_KW40Z.h"
00003 #include "Hexi_OLED_SSD1351.h"
00004 #include "OLED_types.h"
00005 #include "OpenSans_Font.h"
00006 #include "string.h"
00007 
00008 #define LED_ON      0
00009 #define LED_OFF     1
00010 
00011    
00012 void StartHaptic(void);
00013 void StopHaptic(void const *n);
00014 void txTask(void);
00015 long ReadWeight(void);
00016 uint16_t getGram();
00017 long offset = 0;
00018 long getAverageValue(int times);
00019 
00020 // Pin connections for Hexiwear
00021 //MPL3115A2 MPL3115A2( PTC11, PTC10, MPL3115A2_I2C_ADDRESS);
00022 /* pos [0] = altimeter or pressure value */
00023 /* pos [1] = temperature value */
00024 float sensor_data[2];
00025 
00026 DigitalOut redLed(LED1,1);
00027 DigitalOut greenLed(LED2,1);
00028 DigitalOut blueLed(LED3,1);
00029 DigitalOut haptic(PTB9);
00030 
00031 DigitalIn HX_DOUT(PTC3);
00032 DigitalOut HX_PD_SCK(PTC5);
00033 
00034 /* Define timer for haptic feedback */
00035 RtosTimer hapticTimer(StopHaptic, osTimerOnce);
00036 
00037 /* Instantiate the Hexi KW40Z Driver (UART TX, UART RX) */ 
00038 KW40Z kw40z_device(PTE24, PTE25);
00039 
00040 /* Instantiate the SSD1351 OLED Driver */ 
00041 SSD1351 oled(PTB22,PTB21,PTC13,PTB20,PTE6, PTD15); /* (MOSI,SCLK,POWER,CS,RST,DC) */
00042 
00043 /*Create a Thread to handle sending BLE Sensor Data */ 
00044 Thread txThread;
00045 
00046  /* Text Buffer */ 
00047 char text[20]; 
00048 
00049 /****************************Call Back Functions*******************************/
00050 void ButtonRight(void)
00051 {
00052     StartHaptic();
00053     kw40z_device.ToggleAdvertisementMode();
00054 }
00055 
00056 void ButtonLeft(void)
00057 {
00058     StartHaptic();
00059     kw40z_device.ToggleAdvertisementMode();
00060 }
00061 
00062 void PassKey(void)
00063 {
00064     StartHaptic();
00065     strcpy((char *) text,"PAIR CODE");
00066     oled.TextBox((uint8_t *)text,0,25,95,18);
00067   
00068     /* Display Bond Pass Key in a 95px by 18px textbox at x=0,y=40 */
00069     sprintf(text,"%d", kw40z_device.GetPassKey());
00070     oled.TextBox((uint8_t *)text,0,40,95,18);
00071 }
00072 
00073 /***********************End of Call Back Functions*****************************/
00074 
00075 /********************************Main******************************************/
00076 
00077 int main()
00078 {    
00079     Thread::wait(10000);
00080     offset = getAverageValue(20);
00081     /* Get OLED Class Default Text Properties */
00082     oled_text_properties_t textProperties = {0};
00083     oled.GetTextProperties(&textProperties);    
00084 
00085     /* Turn on the backlight of the OLED Display */
00086     oled.DimScreenON();
00087     
00088     /* Fills the screen with solid black */         
00089     oled.FillScreen(COLOR_BLACK);
00090         
00091     /* Register callbacks to application functions */
00092     kw40z_device.attach_buttonLeft(&ButtonLeft);
00093     kw40z_device.attach_buttonRight(&ButtonRight);
00094     kw40z_device.attach_passkey(&PassKey);
00095 
00096     /* Change font color to white */ 
00097     textProperties.fontColor   = COLOR_WHITE;
00098     oled.SetTextProperties(&textProperties);
00099     
00100     /* Display Bluetooth Label at x=17,y=30 */ 
00101     strcpy((char *) text,"89.9kg");
00102     oled.Label((uint8_t *)text,17,30);
00103     
00104     
00105     /* Change font color to Blue */ 
00106     textProperties.fontColor   = COLOR_BLUE;
00107     oled.SetTextProperties(&textProperties);
00108     
00109     /* Display Bluetooth Label at x=17,y=65 */ 
00110     strcpy((char *) text,"BLUETOOTH");
00111     oled.Label((uint8_t *)text,17,65);
00112     
00113     /* Change font color to white */ 
00114     textProperties.fontColor   = COLOR_WHITE;
00115     textProperties.alignParam = OLED_TEXT_ALIGN_CENTER;
00116     oled.SetTextProperties(&textProperties);
00117     
00118     /* Display Label at x=22,y=80 */ 
00119     strcpy((char *) text,"Tap Below");
00120     oled.Label((uint8_t *)text,22,80);
00121          
00122     uint8_t prevLinkState = 0; 
00123     uint8_t currLinkState = 0; 
00124     txThread.start(txTask); /*Start transmitting Sensor Tag Data */
00125     
00126     while (true) 
00127     {
00128         blueLed = !kw40z_device.GetAdvertisementMode(); /*Indicate BLE Advertisment Mode*/   
00129         Thread::wait(50);
00130     }
00131 }
00132 
00133 /******************************End of Main*************************************/
00134 
00135 
00136 /* txTask() transmits the sensor data */
00137 void txTask(void){
00138    
00139    while (true) 
00140    {
00141         /* sets the gain of hx711 to 128*/
00142         ReadWeight();
00143         
00144         /*Notify Hexiwear App that it is running Sensor Tag mode*/
00145         kw40z_device.SendSetApplicationMode(GUI_CURRENT_APP_SENSOR_TAG);
00146 
00147         /*Send weight using pressure service*/ 
00148         kw40z_device.SendPressure(getGram());      
00149         Thread::wait(1000);                 
00150     }
00151 }
00152 
00153 void StartHaptic(void)  {
00154     hapticTimer.start(50);
00155     haptic = 1;
00156 }
00157 
00158 void StopHaptic(void const *n) {
00159     haptic = 0;
00160     hapticTimer.stop();
00161 }
00162 
00163 long ReadWeight(void)
00164 {
00165         long Count;
00166         unsigned char i;
00167         HX_PD_SCK.write(0);
00168         Count = 0;
00169         while(HX_DOUT.read() == 1);
00170         for (i=0;i<24;i++)
00171         {
00172                 HX_PD_SCK.write(1);
00173                 Count=Count<<1;
00174                 HX_PD_SCK.write(0);
00175                 if(HX_DOUT.read() == 1) Count++;
00176         }
00177         HX_PD_SCK.write(1);
00178         Count=Count^0x800000;
00179         HX_PD_SCK.write(0);
00180         return(Count);
00181 }
00182 
00183 uint16_t getGram(){
00184     return ((getAverageValue(20) - offset))/1000;
00185 }
00186 
00187 long getAverageValue(int times){
00188     long sum = 0;
00189     for (int i = 1; i <= times; i++)
00190     {
00191         sum += ReadWeight();
00192     }
00193     return sum / times;
00194 }
00195 
00196 
00197 
00198 
00199