jim hamblen / Mbed 2 deprecated I2C_Debug_for_RealTerm

I2C debug program for use with RealTerm. Sends I2C commands to P9 and P10. Run program on mbed. Start RealTerm, select the mbed virtual com port under the port tab, then open RealTerm's I2C command tab. Reset mbed. See http://mbed.org/users/4180_1/notebook/i2c-debug-for-realterm/ for instructions

Dependencies:   mbed

Files at this revision

API Documentation at this revision

Revision 2:fa8c916b42a9, committed 2011-03-14

Comitter:
4180_1
Date:
Mon Mar 14 00:50:34 2011 +0000
Parent:
1:be1498ba7fb4
Commit message:
ver3

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
diff -r be1498ba7fb4 -r fa8c916b42a9 main.cpp
--- a/main.cpp	Fri Mar 11 03:25:42 2011 +0000
+++ b/main.cpp	Mon Mar 14 00:50:34 2011 +0000
@@ -15,6 +15,7 @@
 
 int main() {
     char last_command=0;
+    char previous_command=0;
     char current_char=0;
     char address=0;
     char data [255];
@@ -31,15 +32,20 @@
     i2c.frequency(75000);
     i2c.start();
     i2c.stop();
+    // Send a start message to RealTerm
+    pc.printf("\fmbed I2C debug tool ready\n\r");
+    // Scan for I2C devices that reply with ack
+    for (i=0; i<=254; i=i+2) {
+        if (i2c.read(i, &data[0], 1) ==0) printf("I2C device detected at address=%2.2X\n\r", i);
+    }
+    data[0]=0;
     i2c.start();
     i2c.stop();
-// Send a start message to RealTerm
-    pc.printf("\fmbed I2C debug tool ready\n\r");
 // Loop processing command strings from RealTerm
     while (1) {
         current_char = pc.getc();
         // Is it a two character ASCII string data byte value
-        if (current_char <='F') {
+        if ((current_char <='F') && (current_char !='?')) {
             // convert to a binary byte
             if (current_char <='9') current_byte = current_char - '0';
             else current_byte =current_char +10 -'A';
@@ -69,6 +75,7 @@
             switch (last_command) {
                     // Start
                 case 'S':
+                    if (previous_command == 'S') i2c.start();
                     first_data_byte=1;
                     break;
                     // Stop
@@ -106,9 +113,10 @@
                     break;
                     // Unknown or unimplemented command
                 default:
-                    pc.printf("unknown command");
+                    pc.printf(" unknown command \n\r");
                     break;
             }
+            previous_command = last_command;
         }
     }
 }
\ No newline at end of file