EmbeddedArtists AB
Solutions for the SPI 7-Segment experiments for LPC812 MAX
Revision 0:933fe0778bc8, committed 2013-11-24
- Comitter:
- embeddedartists
- Date:
- Sun Nov 24 11:17:53 2013 +0000
- Commit message:
- First version
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
--- /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
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Sun Nov 24 11:17:53 2013 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/a9913a65894f \ No newline at end of file