Diff: main.cpp

Revision:

0:6e3731afdabf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jun 29 09:15:43 2016 +0000
@@ -0,0 +1,158 @@
+/* 
+    MS5803_14BA with 0.96" OLED Display
+ */
+ 
+#include "mbed.h"
+#include "Adafruit_SSD1306.h"
+#include "MS5803_14BA.h"
+
+//#define DISPLAY_USES_SPI
+//#define DISPLAY_USES_I2C
+
+#ifdef TARGET_K64F
+ #define SPI_SCK     PTD1
+ #define SPI_MOSI    PTD2
+ #define SPI_MISO    PTD3
+ #define SPI_CS      PTD0
+ #define I2C_SDA     PTE25
+ #define I2C_SCL     PTE24
+ #define displayDC   PTC4
+ #define displayRST  PTC3
+#elif defined(TARGET_KL25Z)
+ #define SPI_SCK     PTD1
+ #define SPI_MOSI    PTD2
+ #define SPI_MISO    PTD3
+ #define SPI_CS      PTD0
+ #define I2C_SDA     PTE0
+ #define I2C_SCL     PTE1
+ #define displayDC   PTD5
+ #define displayRST  PTA13
+#endif
+
+#define descentSL   (double) 23.0    // Descent speed limit in m/s
+#define liftSL      (double) 9.0     // Lift speed limit in m/s
+
+#define LED_ON 0
+#define LED_OFF 1
+
+#ifdef DISPLAY_USES_SPI
+ // an SPI sub-class that provides a constructed default
+ class SPIPreInit : public SPI
+ {
+ public:
+     SPIPreInit(PinName mosi, PinName miso, PinName clk) : SPI(mosi,miso,clk)
+     {
+        format(8, 3);
+        frequency(100000);
+     };
+ };
+
+ SPIPreInit gSpi(SPI_MOSI, NC, SPI_SCK);
+ Adafruit_SSD1306_Spi display(gSpi, displayDC, displayRST, SPI_CS, 64, 128);
+#elif defined(DISPLAY_USES_I2C)
+ #define DISPLAY_I2C_ADDRESS    0x00
+ 
+ // an I2C sub-class that provides a constructed default
+ class I2CPreInit : public I2C
+ {
+ public:
+     I2CPreInit(PinName sda, PinName scl) : I2C(sda, scl)
+     {
+         frequency(400000);
+         start();
+     };
+ };
+
+ I2CPreInit gI2C(I2C_SDA, I2C_SCL);
+ Adafruit_SSD1306_I2c display(gI2C, displayRST, DISPLAY_I2C_ADDRESS, 64, 128);
+#endif
+ 
+Ticker ticker;
+char tmpstr[50];
+Serial pc(USBTX, USBRX);
+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)
+bool volatile tick = false;
+uint8_t k;
+double p, p0 = 0.0, pp = 0.0, h = 0.0, hmax = 0.0, t = 20.0;
+DigitalOut greenLED(LED_GREEN);
+DigitalOut redLED(LED_RED);
+//DigitalOut blueLED(LED_BLUE); // blueLED is not usable because it is shared with the SPI0_SCK line!
+
+void ticker_ISR() {
+    tick = true;
+}
+
+void setup() {
+    greenLED = LED_OFF;
+    redLED = LED_OFF;
+    pc.baud(115200);
+    sprintf(tmpstr, "MS5803 demo\n");
+    pc.printf(tmpstr);
+    
+    sensor.reset();
+
+#if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
+    display.printf(tmpstr);
+#endif
+    
+    sprintf(tmpstr, "Calibrating...\r\n\r\n");
+
+ #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
+    display.printf(tmpstr);
+    display.display();
+#endif
+
+    // gets the reference (surface) pressure as the mean of 10 initial measures
+    for (k = 1; k <= 10; k++) {
+        sensor.convert();
+                p0 = (p0*(k-1) + sensor.pressure)/k;
+    }
+    hmax = 0.0;
+        
+ #if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
+    display.clearDisplay();
+ //   display.setTextSize((uint8_t) 2);
+ #endif
+    ticker.attach(&ticker_ISR, 0.1);    
+}
+
+int main()
+{   
+    setup();
+        
+    while(1) {
+            while(!tick); // wait a timer interrupt
+      tick = false;
+            greenLED = LED_ON;
+
+            sensor.convert();
+            p = sensor.pressure; // pressure in mBar
+            t = sensor.temperature; // temperature in degC
+            h = (p - p0)/100; // depth in m
+            hmax = (h > hmax) ? h : hmax; // max depth
+/*        
+            if ((p - pp)/60 > descentSL)
+        redLED = LED_ON;
+            else
+                redLED = LED_OFF;
+        
+            if ((p - pp)/60 < -liftSL)
+                redLED = LED_ON;
+            else
+                redLED = LED_OFF;
+
+            pp = p;
+*/
+            sprintf(tmpstr, "%.1f mBar/%.1f m\r\n%.1f C", p, h, t);
+            pc.printf(tmpstr);//"%.3f\n", p);
+            pc.printf("\n");
+                    
+#if defined(DISPLAY_USES_SPI) || defined(DISPLAY_USES_I2C)
+      display.clearDisplay();
+      display.setTextCursor(0, 0);
+      display.printf("%s", tmpstr);
+      display.display();
+#endif
+      greenLED = LED_OFF;
+    }
+}