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

main.cpp@1:be1498ba7fb4, 2011-03-11 (annotated)

Committer:
4180_1
Date:
Fri Mar 11 03:25:42 2011 +0000
Revision:
1:be1498ba7fb4
Parent:
0:0c54b73b002c
Child:
2:fa8c916b42a9
ver 2

Who changed what in which revision?

UserRevisionLine numberNew contents of line
4180_1 0:0c54b73b002c 1 #include "mbed.h"
4180_1 0:0c54b73b002c 2 // The program sends and receives I2C commands using RealTerm's I2C tab feature
4180_1 0:0c54b73b002c 3 // Run Realterm on PC and this program on mbed
4180_1 0:0c54b73b002c 4 // In RealTerm connect to the mbed's USB virtual COM port
4180_1 0:0c54b73b002c 5 // Switch to I2C tab
4180_1 0:0c54b73b002c 6 // Type in I2C address & data to read and write and see the response
4180_1 0:0c54b73b002c 7 // It is handy to debug complex I2C hardware setups
4180_1 1:be1498ba7fb4 8 // Prints "No Ack!" when no I2C device responds to the address
4180_1 1:be1498ba7fb4 9 //
4180_1 1:be1498ba7fb4 10 // See Instructions at http://mbed.org/users/4180_1/notebook/i2c-debug-for-realterm/
4180_1 1:be1498ba7fb4 11 //
4180_1 0:0c54b73b002c 12 DigitalOut myled(LED1);
4180_1 0:0c54b73b002c 13 Serial pc(USBTX, USBRX);
4180_1 0:0c54b73b002c 14 I2C i2c(p9,p10);
4180_1 0:0c54b73b002c 15
4180_1 0:0c54b73b002c 16 int main() {
4180_1 1:be1498ba7fb4 17 char last_command=0;
4180_1 1:be1498ba7fb4 18 char current_char=0;
4180_1 1:be1498ba7fb4 19 char address=0;
4180_1 1:be1498ba7fb4 20 char data [255];
4180_1 1:be1498ba7fb4 21 char current_byte=0;
4180_1 0:0c54b73b002c 22 char cmd[255];
4180_1 0:0c54b73b002c 23 int cmd_count=0;
4180_1 1:be1498ba7fb4 24 int data_count=0;
4180_1 1:be1498ba7fb4 25 int read=0;
4180_1 1:be1498ba7fb4 26 int write=0;
4180_1 1:be1498ba7fb4 27 int first_data_byte=0;
4180_1 0:0c54b73b002c 28 int i=0;
4180_1 1:be1498ba7fb4 29
4180_1 0:0c54b73b002c 30 myled=1;
4180_1 0:0c54b73b002c 31 i2c.frequency(75000);
4180_1 0:0c54b73b002c 32 i2c.start();
4180_1 1:be1498ba7fb4 33 i2c.stop();
4180_1 0:0c54b73b002c 34 i2c.start();
4180_1 1:be1498ba7fb4 35 i2c.stop();
4180_1 1:be1498ba7fb4 36 // Send a start message to RealTerm
4180_1 1:be1498ba7fb4 37 pc.printf("\fmbed I2C debug tool ready\n\r");
4180_1 1:be1498ba7fb4 38 // Loop processing command strings from RealTerm
4180_1 0:0c54b73b002c 39 while (1) {
4180_1 1:be1498ba7fb4 40 current_char = pc.getc();
4180_1 1:be1498ba7fb4 41 // Is it a two character ASCII string data byte value
4180_1 1:be1498ba7fb4 42 if (current_char <='F') {
4180_1 1:be1498ba7fb4 43 // convert to a binary byte
4180_1 1:be1498ba7fb4 44 if (current_char <='9') current_byte = current_char - '0';
4180_1 1:be1498ba7fb4 45 else current_byte =current_char +10 -'A';
4180_1 1:be1498ba7fb4 46 current_char = pc.getc();
4180_1 1:be1498ba7fb4 47 if (current_char >'F') pc.printf("error|\n\r");
4180_1 1:be1498ba7fb4 48 if (current_char <='9') current_byte = (current_byte <<4) | (current_char - '0');
4180_1 1:be1498ba7fb4 49 else current_byte = (current_byte <<4)|(current_char +10 -'A');
4180_1 1:be1498ba7fb4 50 // first byte after S command is the I2C address
4180_1 1:be1498ba7fb4 51 if (first_data_byte==1) {
4180_1 1:be1498ba7fb4 52 first_data_byte=0;
4180_1 1:be1498ba7fb4 53 address=current_byte;
4180_1 1:be1498ba7fb4 54 pc.printf(" -I2C address=%2.2X ", address);
4180_1 1:be1498ba7fb4 55 //Odd I2C address is a read and even is a write
4180_1 1:be1498ba7fb4 56 if ((address & 0x01) == 0) write=1;
4180_1 1:be1498ba7fb4 57 else read=1;
4180_1 1:be1498ba7fb4 58 } else
4180_1 1:be1498ba7fb4 59 // Read in cmd bytes for write
4180_1 1:be1498ba7fb4 60 if ((last_command == 'S')&&(read==0)) {
4180_1 1:be1498ba7fb4 61 cmd[cmd_count]=current_byte;
4180_1 1:be1498ba7fb4 62 cmd_count++;
4180_1 0:0c54b73b002c 63 }
4180_1 1:be1498ba7fb4 64 // number of bytes for a read
4180_1 1:be1498ba7fb4 65 if ((last_command =='R')||(read==1)) data_count=current_byte;
4180_1 1:be1498ba7fb4 66 } else {
4180_1 1:be1498ba7fb4 67 // Not a number - it is a command character
4180_1 1:be1498ba7fb4 68 last_command = current_char;
4180_1 1:be1498ba7fb4 69 switch (last_command) {
4180_1 1:be1498ba7fb4 70 // Start
4180_1 1:be1498ba7fb4 71 case 'S':
4180_1 1:be1498ba7fb4 72 first_data_byte=1;
4180_1 1:be1498ba7fb4 73 break;
4180_1 1:be1498ba7fb4 74 // Stop
4180_1 1:be1498ba7fb4 75 case 'P':
4180_1 1:be1498ba7fb4 76 // Do the I2C write
4180_1 1:be1498ba7fb4 77 if (write==1) {
4180_1 1:be1498ba7fb4 78 pc.printf(" write ");
4180_1 1:be1498ba7fb4 79 if (i2c.write(address,cmd,cmd_count)!=0) pc.printf(" No Ack! ");
4180_1 1:be1498ba7fb4 80 for (i=0; i<cmd_count; i++)
4180_1 1:be1498ba7fb4 81 pc.printf(" cmd=%2.2X ", cmd[i]);
4180_1 0:0c54b73b002c 82 }
4180_1 1:be1498ba7fb4 83 // Do the I2C read
4180_1 1:be1498ba7fb4 84 if (read==1) {
4180_1 1:be1498ba7fb4 85 pc.printf(" read ");
4180_1 1:be1498ba7fb4 86 if (i2c.read(address, data, data_count) != 0) pc.printf(" No Ack! ");
4180_1 1:be1498ba7fb4 87 for (i=0; i<data_count; i++)
4180_1 1:be1498ba7fb4 88 pc.printf(" data=%2.2X ",data[i]);
4180_1 1:be1498ba7fb4 89 }
4180_1 1:be1498ba7fb4 90 // reset values for next I2C operation
4180_1 1:be1498ba7fb4 91 i2c.stop();
4180_1 1:be1498ba7fb4 92 pc.printf("\n\r");
4180_1 1:be1498ba7fb4 93 read=0;
4180_1 1:be1498ba7fb4 94 data_count=0;
4180_1 1:be1498ba7fb4 95 cmd_count=0;
4180_1 1:be1498ba7fb4 96 write=0;
4180_1 1:be1498ba7fb4 97 first_data_byte=0;
4180_1 1:be1498ba7fb4 98 break;
4180_1 1:be1498ba7fb4 99 // Read after write
4180_1 1:be1498ba7fb4 100 case 'R':
4180_1 1:be1498ba7fb4 101 read=1;
4180_1 1:be1498ba7fb4 102 break;
4180_1 1:be1498ba7fb4 103 // Status request
4180_1 1:be1498ba7fb4 104 case '?':
4180_1 1:be1498ba7fb4 105 pc.printf(" mbed ready \n\r");
4180_1 1:be1498ba7fb4 106 break;
4180_1 1:be1498ba7fb4 107 // Unknown or unimplemented command
4180_1 1:be1498ba7fb4 108 default:
4180_1 1:be1498ba7fb4 109 pc.printf("unknown command");
4180_1 1:be1498ba7fb4 110 break;
4180_1 1:be1498ba7fb4 111 }
4180_1 0:0c54b73b002c 112 }
4180_1 0:0c54b73b002c 113 }
4180_1 0:0c54b73b002c 114 }