Gert Jan Schoneveld / Mbed 2 deprecated LedShow

This demo shows: - how to write to the multiple outputs/leds using a bus - how to send (debug) info to the pc - how to persist values

Dependencies:   mbed

No extra hardware needed. The Led Show uses the 4 build in mbed leds.

main.cpp@0:d5f986c1b759, 2012-11-01 (annotated)

Committer:
gj_schoneveld
Date:
Thu Nov 01 20:49:54 2012 +0000
Revision:
0:d5f986c1b759
Initial version.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
gj_schoneveld 0:d5f986c1b759 1 /*
gj_schoneveld 0:d5f986c1b759 2 LedShow
gj_schoneveld 0:d5f986c1b759 3
gj_schoneveld 0:d5f986c1b759 4 This demo shows:
gj_schoneveld 0:d5f986c1b759 5 - how to write to the multiple outputs/leds using a bus
gj_schoneveld 0:d5f986c1b759 6 - how to send (debug) info to the pc
gj_schoneveld 0:d5f986c1b759 7 - how to persist values
gj_schoneveld 0:d5f986c1b759 8
gj_schoneveld 0:d5f986c1b759 9 */
gj_schoneveld 0:d5f986c1b759 10
gj_schoneveld 0:d5f986c1b759 11 #include "mbed.h"
gj_schoneveld 0:d5f986c1b759 12
gj_schoneveld 0:d5f986c1b759 13 BusOut leds(LED1, LED2, LED3, LED4);
gj_schoneveld 0:d5f986c1b759 14 Serial pc(USBTX, USBRX);
gj_schoneveld 0:d5f986c1b759 15 LocalFileSystem local("local");
gj_schoneveld 0:d5f986c1b759 16
gj_schoneveld 0:d5f986c1b759 17 #define delay 0.25
gj_schoneveld 0:d5f986c1b759 18 typedef struct {
gj_schoneveld 0:d5f986c1b759 19 int value;
gj_schoneveld 0:d5f986c1b759 20 int steps;
gj_schoneveld 0:d5f986c1b759 21 } show;
gj_schoneveld 0:d5f986c1b759 22 show shows[] = {{1, 4}, {3, 3}, {7, 2}, {5, 2}, {15, 5}};
gj_schoneveld 0:d5f986c1b759 23 char *show_file = "/local/show.txt";
gj_schoneveld 0:d5f986c1b759 24 char *format = "%d\n";
gj_schoneveld 0:d5f986c1b759 25
gj_schoneveld 0:d5f986c1b759 26 int main()
gj_schoneveld 0:d5f986c1b759 27 {
gj_schoneveld 0:d5f986c1b759 28 pc.printf("*** The Ultimate Led Show ***\n");
gj_schoneveld 0:d5f986c1b759 29
gj_schoneveld 0:d5f986c1b759 30 int show_index = 0;
gj_schoneveld 0:d5f986c1b759 31
gj_schoneveld 0:d5f986c1b759 32 FILE *fp = fopen(show_file, "r");
gj_schoneveld 0:d5f986c1b759 33 if (fp) {
gj_schoneveld 0:d5f986c1b759 34 fscanf(fp, format, &show_index);
gj_schoneveld 0:d5f986c1b759 35 fclose(fp);
gj_schoneveld 0:d5f986c1b759 36 }
gj_schoneveld 0:d5f986c1b759 37
gj_schoneveld 0:d5f986c1b759 38 fp = fopen(show_file, "w");
gj_schoneveld 0:d5f986c1b759 39 if (fp) {
gj_schoneveld 0:d5f986c1b759 40 fprintf(fp, format, (show_index + 1) % (sizeof(shows) / sizeof(show)));
gj_schoneveld 0:d5f986c1b759 41 fclose(fp);
gj_schoneveld 0:d5f986c1b759 42 }
gj_schoneveld 0:d5f986c1b759 43
gj_schoneveld 0:d5f986c1b759 44 pc.printf("Show %d out of %d.\n", show_index + 1, (sizeof(shows) / sizeof(show)));
gj_schoneveld 0:d5f986c1b759 45 pc.printf("Press the reset button to move to the next one.\n");
gj_schoneveld 0:d5f986c1b759 46
gj_schoneveld 0:d5f986c1b759 47 show current = shows[show_index];
gj_schoneveld 0:d5f986c1b759 48
gj_schoneveld 0:d5f986c1b759 49 int step = 0;
gj_schoneveld 0:d5f986c1b759 50 bool step_forward = true;
gj_schoneveld 0:d5f986c1b759 51 while(1) {
gj_schoneveld 0:d5f986c1b759 52 leds = current.value << step;
gj_schoneveld 0:d5f986c1b759 53 wait(delay);
gj_schoneveld 0:d5f986c1b759 54
gj_schoneveld 0:d5f986c1b759 55 if (step == 0)
gj_schoneveld 0:d5f986c1b759 56 step_forward = true;
gj_schoneveld 0:d5f986c1b759 57 else if (step == current.steps - 1)
gj_schoneveld 0:d5f986c1b759 58 step_forward = false;
gj_schoneveld 0:d5f986c1b759 59
gj_schoneveld 0:d5f986c1b759 60 if (step_forward)
gj_schoneveld 0:d5f986c1b759 61 step++;
gj_schoneveld 0:d5f986c1b759 62 else
gj_schoneveld 0:d5f986c1b759 63 step--;
gj_schoneveld 0:d5f986c1b759 64 }
gj_schoneveld 0:d5f986c1b759 65 }