main.cpp

00001 /* 
00002     MS5803_14BA with 0.96" OLED Display
00003  */
00004  
00005 #include "mbed.h"
00006 #include "Adafruit_SSD1306.h"
00007 #include "MS5803_14BA.h"
00008 
00009 //#define DISPLAY_USES_SPI
00010 //#define DISPLAY_USES_I2C
00011 
00012 #ifdef TARGET_K64F
00013  #define SPI_SCK     PTD1
00014  #define SPI_MOSI    PTD2
00015  #define SPI_MISO    PTD3
00016  #define SPI_CS      PTD0
00017  #define I2C_SDA     PTE25
00018  #define I2C_SCL     PTE24
00019  #define displayDC   PTC4
00020  #define displayRST  PTC3
00021 #elif defined(TARGET_KL25Z)
00022  #define SPI_SCK     PTD1
00023  #define SPI_MOSI    PTD2
00024  #define SPI_MISO    PTD3
00025  #define SPI_CS      PTD0
00026  #define I2C_SDA     PTE0
00027  #define I2C_SCL     PTE1
00028  #define displayDC   PTD5
00029  #define displayRST  PTA13
00030 #endif
00031 
00032 #define descentSL   (double) 23.0    // Descent speed limit in m/s
00033 #define liftSL      (double) 9.0     // Lift speed limit in m/s
00034 
00035 #define LED_ON 0
00036 #define LED_OFF 1
00037 
00038 #ifdef DISPLAY_USES_SPI
00039  // an SPI sub-class that provides a constructed default
00040  class SPIPreInit : public SPI
00041  {
00042  public:
00043      SPIPreInit(PinName mosi, PinName miso, PinName clk) : SPI(mosi,miso,clk)
00044      {
00045         format(8, 3);
00046         frequency(100000);
00047      };
00048  };
00049 
00050  SPIPreInit gSpi(SPI_MOSI, NC, SPI_SCK);
00051  Adafruit_SSD1306_Spi display(gSpi, displayDC, displayRST, SPI_CS, 64, 128);
00052 #elif defined(DISPLAY_USES_I2C)
00053  #define DISPLAY_I2C_ADDRESS    0x00
00054  
00055  // an I2C sub-class that provides a constructed default
00056  class I2CPreInit : public I2C
00057  {
00058  public:
00059      I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl)
00060      {
00061          frequency(400000);
00062          start();
00063      };
00064  };
00065 
00066  I2CPreInit gI2C(I2C_SDA, I2C_SCL);
00067  Adafruit_SSD1306_I2c display(gI2C, displayRST, DISPLAY_I2C_ADDRESS, 64, 128);
00068 #endif
00069  
00070 Ticker ticker;
00071 char tmpstr[50];
00072 Serial pc(USBTX, USBRX);
00073 MS5803_14BA  sensor(I2C_SDA, I2C_SCL, 0x3B, D1_OSR_4096, D2_OSR_4096); // SDA, SCL, I2C_address (0x76 or 0x77 look at MS5803.h)
00074 bool volatile tick = false;
00075 uint8_t k;
00076 double p, p0 = 0.0, pp = 0.0, h = 0.0, hmax = 0.0, t = 20.0;
00077 DigitalOut greenLED(LED_GREEN);
00078 DigitalOut redLED(LED_RED);
00079 //DigitalOut blueLED(LED_BLUE); // blueLED is not usable because it is shared with the SPI0_SCK line!
00080 
00081 void ticker_ISR() {
00082     tick = true;
00083 }
00084 
00085 void setup() {
00086     greenLED = LED_OFF;
00087     redLED = LED_OFF;
00088     pc.baud(115200);
00089     sprintf(tmpstr, "MS5803 demo\n");
00090     pc.printf(tmpstr);
00091     
00092     sensor.reset();
00093 
00094 #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
00095     display.printf(tmpstr);
00096 #endif
00097     
00098     sprintf(tmpstr, "Calibrating...\r\n\r\n");
00099 
00100  #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
00101     display.printf(tmpstr);
00102     display.display();
00103 #endif
00104 
00105     // gets the reference (surface) pressure as the mean of 10 initial measures
00106     for (k = 1; k <= 10; k++) {
00107         sensor.convert();
00108                 p0 = (p0*(k-1) + sensor.pressure)/k;
00109     }
00110     hmax = 0.0;
00111         
00112  #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
00113     display.clearDisplay();
00114  //   display.setTextSize((uint8_t) 2);
00115  #endif
00116     ticker.attach(&ticker_ISR, 0.1);    
00117 }
00118 
00119 int main()
00120 {   
00121     setup();
00122         
00123     while(1) {
00124             while(!tick); // wait a timer interrupt
00125       tick = false;
00126             greenLED = LED_ON;
00127 
00128             sensor.convert();
00129             p = sensor.pressure; // pressure in mBar
00130             t = sensor.temperature; // temperature in degC
00131             h = (p - p0)/100; // depth in m
00132             hmax = (h > hmax) ? h : hmax; // max depth
00133 /*        
00134             if ((p - pp)/60 > descentSL)
00135         redLED = LED_ON;
00136             else
00137                 redLED = LED_OFF;
00138         
00139             if ((p - pp)/60 < -liftSL)
00140                 redLED = LED_ON;
00141             else
00142                 redLED = LED_OFF;
00143 
00144             pp = p;
00145 */
00146             sprintf(tmpstr, "%.1f mBar/%.1f m\r\n%.1f C", p, h, t);
00147             pc.printf(tmpstr);//"%.3f\n", p);
00148             pc.printf("\n");
00149                     
00150 #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
00151       display.clearDisplay();
00152       display.setTextCursor(0, 0);
00153       display.printf("%s", tmpstr);
00154       display.display();
00155 #endif
00156       greenLED = LED_OFF;
00157     }
00158 }