Romilly Cocking
Captures digital signals and then displays them in a web browser using SVG.
Dependencies: EthernetNetIf mbed HTTPServer
Revision 0:47fad9a39024, committed 2010-08-13
- Comitter:
- romilly
- Date:
- Fri Aug 13 10:22:41 2010 +0000
- Commit message:
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/EthernetNetIf.lib Fri Aug 13 10:22:41 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/EthernetNetIf/#bc7df6da7589
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HTTPServer.lib Fri Aug 13 10:22:41 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/donatien/code/HTTPServer/#d753966e4d97
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Fri Aug 13 10:22:41 2010 +0000
@@ -0,0 +1,92 @@
+#include "mbed.h"
+#include "EthernetNetIf.h"
+#include "HTTPServer.h"
+
+#define SAMPLE_COUNT 1000
+
+LocalFileSystem local("local");
+
+DigitalOut led1(LED1);
+DigitalIn sda(p9);
+DigitalIn scl(p10);
+
+char sdamem[SAMPLE_COUNT];
+char sclmem[SAMPLE_COUNT];
+
+EthernetNetIf eth;
+HTTPServer svr;
+
+void capture() {
+ scl.mode(PullUp);
+ while (scl) {
+ wait_us(2);
+ }
+ for (int i = 0; i < SAMPLE_COUNT; i++) {
+ sdamem[i] = sda;
+ sclmem[i] = scl;
+ wait_us(1);
+ }
+}
+
+void plot(FILE* fp, char * name, char * mem, int offset) {
+ fprintf(fp, "<g transform='translate(100,%i)'>", offset);
+ fprintf(fp, "<text x='10' y='40' style='fill:black;stroke:none;font-size:16pt;font-family:arial'>%s</text>", name);
+ fprintf(fp, "<path d='M 50 50 ");
+ for (int i = 0; i < SAMPLE_COUNT; i++) {
+ fprintf(fp, "L %i %i %i %i ", 50+ 5*i, 50*mem[i], 55+5*i, 50*mem[i]);
+ }
+ fprintf(fp, "' />\n");
+ fprintf(fp, "</g>");
+}
+
+void writeSVG() {
+ FILE *fp = fopen("/local/out.svg", "w"); // Open "out.txt" on the local file system for writing
+ fprintf(fp, "<svg xmlns='http://www.w3.org/2000/svg' width='1200' height='500'>\n");
+ fprintf(fp, "<text x='500' y='50' style='fill:black;stroke:none;font-size:20pt;font-family:arial'>I2C bus activity</text>");
+ fprintf(fp, "<g style='fill:none;stroke:black'>");
+
+ plot(fp, "SDA", sdamem, 110);
+ plot(fp, "SCL", sclmem, 210);
+
+ fprintf(fp, "</g>");
+ fprintf(fp, "</svg>");
+ fclose(fp);
+}
+
+void startServer() {
+EthernetErr ethErr = eth.setup();
+ if (ethErr) {
+ printf("Error %d in setup.\n", ethErr);
+ return;
+ }
+ printf("Server setup OK\n");
+
+ FSHandler::mount("/local", "/"); //Mount /webfs path on web root path
+ svr.addHandler<FSHandler>("/"); //Default handler
+
+ svr.bind(80);
+
+ printf("Listening...\n");
+
+ Timer tm;
+ tm.start();
+ //Listen indefinitely
+ while (true) {
+ Net::poll();
+ if (tm.read()>.5) {
+ led1=!led1; //Show that we are alive
+ tm.start();
+ }
+ }
+}
+
+
+int main() {
+ led1 = 0;
+ capture();
+ writeSVG();
+ startServer();
+}
+
+
+
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Fri Aug 13 10:22:41 2010 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/9114680c05da