Revision 0:f825c06feba9, committed 2014-07-02

Comitter:

acracan

Date:

Wed Jul 02 06:40:38 2014 +0000

Commit message:

Four cells seven segments display demonstration.

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Jul 02 06:40:38 2014 +0000
@@ -0,0 +1,161 @@
+#include "mbed.h"
+
+// Define display ports
+const PinName cellPins[] = {A0, A1, A2, A3};
+const PinName segPins[] = {D13, D12, D11, D10, D9, D8, D7, D6};
+                        //  A    B    C    D   E   F   G   Dot
+DigitalOut *cellPorts[4];
+DigitalOut *segPorts[8];
+
+Timer displayTimer;
+
+namespace SevenSegments{
+    enum Element {
+      SegA = 1,
+      SegB = 2,
+      SegC = 4,
+      SegD = 8,
+      SegE = 16,
+      SegF = 32,
+      SegG = 64,
+      SegDot = 128
+    };
+    
+    const uint8_t digits[] = {
+      SegA | SegB | SegC | SegD | SegE | SegF,
+      SegB | SegC,
+      SegA | SegB | SegG | SegE | SegD,
+      SegA | SegB | SegG | SegC | SegD,
+      SegF | SegB | SegG | SegC,
+      SegA | SegF | SegG | SegC | SegD,
+      SegA | SegF | SegG | SegE | SegC | SegD,
+      SegA | SegB | SegC,
+      SegA | SegB | SegC | SegD | SegE | SegF | SegG,
+      SegA | SegB | SegG | SegF | SegC | SegD
+    };
+};
+
+
+// Rotary encoder specific objects
+DigitalIn A(D15);
+DigitalIn B(D14);
+
+Timer encoderTimer;
+
+// PC serial connection
+Serial pc(USBTX, USBRX);
+
+int counter = 0;
+uint8_t cellValues[4];
+
+// Function prototypes
+void readEncoder();
+void encoderIncrement();
+void encoderDecrement();
+void displaySevenSegs(uint8_t cellValues[]);
+void valueToBcd(int val, uint8_t cellValues[]);
+
+int main()
+{
+    displayTimer.start();
+
+    // Initialize cell ports
+    for (int i = 0; i < 4; i++) {
+      cellPorts[i] = new DigitalOut(cellPins[i]);
+      *cellPorts[i] = 1;
+    }
+    // Initialize segment ports
+    for (int i = 0; i < 8; i++)
+      segPorts[i] = new DigitalOut(segPins[i]);
+    
+    // Change encoder pin mode
+    A.mode(PullNone);
+    B.mode(PullNone);
+
+    while(1) {
+        displaySevenSegs(cellValues);
+        readEncoder();
+        // fă altceva util
+        // ...
+        
+    }
+}
+
+void bcdToSevenSegs(uint8_t val)
+{
+  uint8_t segs;
+
+  segs = SevenSegments::digits[val];
+  for (int s = 0; s < 8; s++) {
+    if (segs & (1 << s))
+      // Enable segment
+      *segPorts[s] = 1;
+    else
+      // Disable segment
+      *segPorts[s] = 0;
+  }
+}
+
+void displaySevenSegs(uint8_t cellValues[])
+{
+    static bool activeCells[5] = {true, false, false, false, false};
+        
+    if (displayTimer.read_us() < 1000)
+        return;
+    displayTimer.reset();
+    for (int i = 4; i > 0; i--)
+    activeCells[i] = activeCells[i - 1];
+    activeCells[0] = activeCells[4];
+    // Turn off all cells
+    for (int i = 0; i < 4; i++)
+    *cellPorts[i] = 1;
+    // Change cell value
+    for (int i = 0; i < 4; i++)
+    if (activeCells[i])
+        bcdToSevenSegs(cellValues[i]);
+    // Turn on active cell
+    for (int i = 0; i < 4; i++)
+    if (activeCells[i])
+      *cellPorts[i] = 0;
+}
+
+
+void valueToBcd(int val, uint8_t cellValues[])
+{
+  for (int i = 3; i >= 0; i--) {
+    cellValues[i] = val % 10;
+    val /= 10;
+  }
+}
+
+void readEncoder()
+{
+    static int state = 0;
+    int currentState;
+    const int stateOrder[] = {0, 2, 3, 1};
+    const int stateIndex[] = {0, 3, 1, 2};
+    int ccwState, cwState;
+    
+    currentState = (A << 1) + B;
+    ccwState = stateOrder[(stateIndex[state] + 3) & 3];
+    cwState = stateOrder[(stateIndex[state] + 1) & 3];
+    if (currentState == cwState)
+        encoderIncrement();
+    else if (currentState == ccwState)
+        encoderDecrement();
+    state = currentState;
+}
+
+void encoderIncrement()
+{
+    counter++;
+    valueToBcd(counter, cellValues);
+    pc.printf("Counter is: %d.\n\r", counter);
+}
+
+void encoderDecrement()
+{
+    counter--;
+    valueToBcd(counter, cellValues);
+    pc.printf("Counter is: %d.\n\r", counter);    
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jul 02 06:40:38 2014 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/024bf7f99721
\ No newline at end of file