Revision 0:61f4d516e96d, committed 2020-02-06

Comitter:

ghsalazar

Date:

Thu Feb 06 13:34:11 2020 +0000

Commit message:

Initial version;

Changed in this revision

diff -r 000000000000 -r 61f4d516e96d main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Feb 06 13:34:11 2020 +0000
@@ -0,0 +1,97 @@
+/** @file   main.cpp
+    @author Gastón SALAZAR <gaston_salazar@yahoo.com>
+    @brief  Display a (hexadecimal-) number sequence on a display
+
+# Interface #
+
+## Physical connections ##
+
+Port    Segment Color
+----    ------- -----
+PB0     A       blue
+PB1     B       red
+PB2     C       yellow
+PB3     D       green
+PB4     E       orange
+PB5     F       violet
+PB6     G       gray
+
+## LEDS on a 7-segment Display ##
+
+ AAA
+F   B
+F   B
+F   B
+ GGG
+E   C
+E   C
+E   C
+ DDD
+
+*/
+
+#include "mbed.h"
+
+const unsigned long     DELAY   = 5000000UL;
+const unsigned short    DISPLAY = 0x7F;
+
+// The programming language is C++, not C as previously done.
+DigitalOut  led(LED1);
+PortOut     myDisplay(PortB, DISPLAY);
+DigitalIn   myButton(USER_BUTTON);
+
+typedef enum {
+    ZERO =   0xc0,
+    ONE =    0xf9,
+    TWO =    0xa4,
+    THREE =  0xb0,
+    FOUR =   0x99,
+    FIVE =   0x92,
+    SIX =    0x82,
+    SEVEN =  0xf8,
+    EIGHT =  0x80,
+    NINE =   0x90,
+    CA =     0x88,
+    CB =     0x83,
+    CC =     0xc6,
+    CD =     0xa1,
+    CE =     0x86,
+    CF =     0x8e
+} digits;
+
+// This was handle in automation, some time ago, with a cam or "drum".
+// And in electronics, it was implemented with a decoder in a ROM.
+// Of course you could implemented it with logic gates.
+const unsigned short int segments[] = {ZERO, ONE, TWO, THREE, FOUR, FIVE,
+                                       SIX, SEVEN, EIGHT, NINE,
+                                       CA, CB, CC, CD, CE, CF
+                                      };
+
+void setup()
+{
+    myDisplay = ZERO;
+}
+
+void loop()
+{
+    static short unsigned   display_count   = 0;
+    static long unsigned    delay_count     = DELAY;
+
+    if (!delay_count) {
+        display_count++;
+        display_count &= 0x0f;
+        myDisplay = segments[display_count];
+        delay_count = DELAY;
+    }
+
+    if (myButton == 1)    // User button NOT pressed
+        delay_count--;
+}
+
+int main()
+{
+    setup();
+    while(1) {
+        loop();
+    }
+}

diff -r 000000000000 -r 61f4d516e96d mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Feb 06 13:34:11 2020 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/65be27845400
\ No newline at end of file