Sukkin Pang
CAN-Bus ECU simulator. Only part of the SAE J1979 are implemented. Uses CAN-Bus demo board as hardware platform. http://skpang.co.uk/catalog/canbus-ecu-simulator-with-lpc1768-module-p-1400.html Useful for testing diagnostic tools.
Fork of
ecu_reader
by 
Sukkin Pang
ecu_reader.cpp@0:908be729d27c, 2010-07-08 (annotated)
- Committer:
- pangsk
- Date:
- Thu Jul 08 21:05:29 2010 +0000
- Revision:
- 0:908be729d27c
- Child:
- 3:05bb8f0bd7a4
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| pangsk | 0:908be729d27c | 1 | #include "mbed.h" |
| pangsk | 0:908be729d27c | 2 | #include "ecu_reader.h" |
| pangsk | 0:908be729d27c | 3 | #include "globals.h" |
| pangsk | 0:908be729d27c | 4 | |
| pangsk | 0:908be729d27c | 5 | |
| pangsk | 0:908be729d27c | 6 | // Use a timer to see if things take too long |
| pangsk | 0:908be729d27c | 7 | Timer CANTimer; |
| pangsk | 0:908be729d27c | 8 | namespace mbed { |
| pangsk | 0:908be729d27c | 9 | |
| pangsk | 0:908be729d27c | 10 | |
| pangsk | 0:908be729d27c | 11 | ecu_reader::ecu_reader(int can_speed) |
| pangsk | 0:908be729d27c | 12 | { |
| pangsk | 0:908be729d27c | 13 | can2.frequency(can_speed); |
| pangsk | 0:908be729d27c | 14 | } |
| pangsk | 0:908be729d27c | 15 | |
| pangsk | 0:908be729d27c | 16 | #define TIMEOUT 200 |
| pangsk | 0:908be729d27c | 17 | unsigned char ecu_reader::request(unsigned char pid, char *buffer) |
| pangsk | 0:908be729d27c | 18 | { |
| pangsk | 0:908be729d27c | 19 | char can_msg[8]; |
| pangsk | 0:908be729d27c | 20 | float engine_data; |
| pangsk | 0:908be729d27c | 21 | |
| pangsk | 0:908be729d27c | 22 | led1 = 1; |
| pangsk | 0:908be729d27c | 23 | |
| pangsk | 0:908be729d27c | 24 | can_msg[0] = 0x02; |
| pangsk | 0:908be729d27c | 25 | can_msg[1] = 0x01; |
| pangsk | 0:908be729d27c | 26 | can_msg[2] = pid; |
| pangsk | 0:908be729d27c | 27 | can_msg[3] = 0; |
| pangsk | 0:908be729d27c | 28 | can_msg[4] = 0; |
| pangsk | 0:908be729d27c | 29 | can_msg[5] = 0; |
| pangsk | 0:908be729d27c | 30 | can_msg[6] = 0; |
| pangsk | 0:908be729d27c | 31 | can_msg[7] = 0; |
| pangsk | 0:908be729d27c | 32 | |
| pangsk | 0:908be729d27c | 33 | if (can2.write(CANMessage(PID_REQUEST, can_msg, 8))) { |
| pangsk | 0:908be729d27c | 34 | |
| pangsk | 0:908be729d27c | 35 | } |
| pangsk | 0:908be729d27c | 36 | |
| pangsk | 0:908be729d27c | 37 | led1 = 0; |
| pangsk | 0:908be729d27c | 38 | CANTimer.reset(); |
| pangsk | 0:908be729d27c | 39 | CANTimer.start(); |
| pangsk | 0:908be729d27c | 40 | |
| pangsk | 0:908be729d27c | 41 | while(CANTimer.read_ms() < TIMEOUT) { |
| pangsk | 0:908be729d27c | 42 | |
| pangsk | 0:908be729d27c | 43 | if (can2.read(can_MsgRx)) { |
| pangsk | 0:908be729d27c | 44 | |
| pangsk | 0:908be729d27c | 45 | if((can_MsgRx.id == PID_REPLY) && (can_MsgRx.data[2] == pid)) |
| pangsk | 0:908be729d27c | 46 | { |
| pangsk | 0:908be729d27c | 47 | switch(can_MsgRx.data[2]) |
| pangsk | 0:908be729d27c | 48 | { /* Details from http://en.wikipedia.org/wiki/OBD-II_PIDs */ |
| pangsk | 0:908be729d27c | 49 | case ENGINE_RPM: // ((A*256)+B)/4 [RPM] |
| pangsk | 0:908be729d27c | 50 | engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/4; |
| pangsk | 0:908be729d27c | 51 | sprintf(buffer,"%d rpm ",(int) engine_data); |
| pangsk | 0:908be729d27c | 52 | break; |
| pangsk | 0:908be729d27c | 53 | |
| pangsk | 0:908be729d27c | 54 | case ENGINE_COOLANT_TEMP: // A-40 [degree C] |
| pangsk | 0:908be729d27c | 55 | engine_data = can_MsgRx.data[3] - 40; |
| pangsk | 0:908be729d27c | 56 | sprintf(buffer,"%d degC ",(int) engine_data); |
| pangsk | 0:908be729d27c | 57 | |
| pangsk | 0:908be729d27c | 58 | break; |
| pangsk | 0:908be729d27c | 59 | |
| pangsk | 0:908be729d27c | 60 | case VEHICLE_SPEED: // A [km] |
| pangsk | 0:908be729d27c | 61 | engine_data = can_MsgRx.data[3]; |
| pangsk | 0:908be729d27c | 62 | sprintf(buffer,"%d km ",(int) engine_data); |
| pangsk | 0:908be729d27c | 63 | |
| pangsk | 0:908be729d27c | 64 | break; |
| pangsk | 0:908be729d27c | 65 | |
| pangsk | 0:908be729d27c | 66 | case MAF_SENSOR: // ((256*A)+B) / 100 [g/s] |
| pangsk | 0:908be729d27c | 67 | engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/100; |
| pangsk | 0:908be729d27c | 68 | sprintf(buffer,"%d g/s",(int) engine_data); |
| pangsk | 0:908be729d27c | 69 | |
| pangsk | 0:908be729d27c | 70 | break; |
| pangsk | 0:908be729d27c | 71 | |
| pangsk | 0:908be729d27c | 72 | case O2_VOLTAGE: // A * 0.005 (B-128) * 100/128 (if B==0xFF, sensor is not used in trim calc) |
| pangsk | 0:908be729d27c | 73 | engine_data = can_MsgRx.data[3]*0.005; |
| pangsk | 0:908be729d27c | 74 | sprintf(buffer,"%d v ",(int) engine_data); |
| pangsk | 0:908be729d27c | 75 | |
| pangsk | 0:908be729d27c | 76 | case THROTTLE: // |
| pangsk | 0:908be729d27c | 77 | engine_data = (can_MsgRx.data[3]*100)/255; |
| pangsk | 0:908be729d27c | 78 | sprintf(buffer,"%d %% ",(int) engine_data); |
| pangsk | 0:908be729d27c | 79 | |
| pangsk | 0:908be729d27c | 80 | |
| pangsk | 0:908be729d27c | 81 | break; |
| pangsk | 0:908be729d27c | 82 | } |
| pangsk | 0:908be729d27c | 83 | |
| pangsk | 0:908be729d27c | 84 | return 1; |
| pangsk | 0:908be729d27c | 85 | |
| pangsk | 0:908be729d27c | 86 | } |
| pangsk | 0:908be729d27c | 87 | |
| pangsk | 0:908be729d27c | 88 | } |
| pangsk | 0:908be729d27c | 89 | } |
| pangsk | 0:908be729d27c | 90 | |
| pangsk | 0:908be729d27c | 91 | return 0; |
| pangsk | 0:908be729d27c | 92 | |
| pangsk | 0:908be729d27c | 93 | |
| pangsk | 0:908be729d27c | 94 | |
| pangsk | 0:908be729d27c | 95 | |
| pangsk | 0:908be729d27c | 96 | } |
| pangsk | 0:908be729d27c | 97 | } // namespace mbed |