Diff: main.cpp

Revision:

0:933fe0778bc8

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Nov 24 11:17:53 2013 +0000
@@ -0,0 +1,106 @@
+#include "mbed.h"
+
+DigitalOut ssel(D10);
+SPI spi(D11, D12, D13); // mosi, miso, sclk
+
+Serial pc(USBTX, USBRX);
+
+#define SEG_A   0x80
+#define SEG_B   0x40
+#define SEG_C   0x20
+#define SEG_D   0x10
+#define SEG_E   0x08
+#define SEG_F   0x04
+#define SEG_G   0x02
+#define RDP     0x01
+
+const uint8_t segments[16] = {
+    SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F        ,  //0 = A,B,C,D,E,F
+            SEG_B | SEG_C                                ,  //1 = B,C
+    SEG_A | SEG_B |         SEG_D | SEG_E |         SEG_G,  //2 = A,B,D,E,G
+    SEG_A | SEG_B | SEG_C | SEG_D |                 SEG_G,  //3 = A,B,C,D,G
+            SEG_B | SEG_C |                 SEG_F | SEG_G,  //4 = B,C,F,G
+    SEG_A |         SEG_C | SEG_D |         SEG_F | SEG_G,  //5 = A,C,D,F,G
+    SEG_A |         SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,  //6 = A,C,D,E,F,G
+    SEG_A | SEG_B | SEG_C                                ,  //7 = A,B,C
+    SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,  //8 = A,B,C,D,E,F,G
+    SEG_A | SEG_B | SEG_C | SEG_D |         SEG_F | SEG_G,  //9 = A,B,C,D,F,G
+    SEG_A | SEG_B | SEG_C |         SEG_E | SEG_F | SEG_G,  //A = A,B,C,E,F,G
+                    SEG_C | SEG_D | SEG_E | SEG_F | SEG_G,  //B = C,D,E,F,G
+                            SEG_D | SEG_E |         SEG_G,  //C = D,E,G
+            SEG_B | SEG_C | SEG_D | SEG_E |         SEG_G,  //D = B,C,D,E,G
+    SEG_A |                 SEG_D | SEG_E | SEG_F | SEG_G,  //E = A,D,E,F,G
+    SEG_A |                         SEG_E | SEG_F | SEG_G}; //F = A,E,F,G
+
+static void send(int val)
+{
+    // control SSEL
+    ssel = 0;
+ 
+    spi.write(val);
+ 
+    // control SSEL
+    ssel = 1;
+}
+
+static bool readback(int val)
+{
+    int existing = spi.write(val);
+    int expected = spi.write(0x00);
+    
+    if ((val & 0xff) == (expected & 0xff)) {
+        return true;
+    }
+    return false;
+}
+
+static void experiment1_alt1()
+{
+    pc.printf("Starting...\n");
+    
+    do {
+        if (readback(~segments[0xe])) {
+            wait(0.5);
+            if (readback(~segments[0xa])) {
+                printf("readback successfull\n");
+                break;
+            }
+        }
+        printf("readback failed\n");
+    } while(0);
+    
+    while(1)
+        ;
+}
+
+static void experiment1_alt2()
+{
+    while(1) {
+        for (int i = 0; i < 16; i++) {
+            send(~segments[i]);
+            wait(0.4);
+        }
+    }
+}
+
+static void experiment1_alt3()
+{
+    while(1) {
+        send(~SEG_A);wait(1);
+        send(~SEG_B);wait(1);
+        send(~SEG_C);wait(1);
+        send(~SEG_D);wait(1);
+        send(~SEG_E);wait(1);
+        send(~SEG_F);wait(1);
+        send(~SEG_G);wait(1);
+        send(~RDP);wait(1);
+    }
+}
+
+
+int main()
+{
+    //experiment1_alt1(); // readback test - shift register verification
+    //experiment1_alt2(); // automatic counter
+    experiment1_alt3(); // running one
+}