Ali Bros
OBDII library, based on SK Pang\\\'s ecu reader. more details to be added shortly.
OBDII.cpp@1:4b7c280d433d, 2011-05-02 (annotated)
- Committer:
- AliBros
- Date:
- Mon May 02 04:34:18 2011 +0000
- Revision:
- 1:4b7c280d433d
- Parent:
- 0:5b4bcf184488
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| AliBros | 0:5b4bcf184488 | 1 | #include "mbed.h" |
| AliBros | 0:5b4bcf184488 | 2 | #include "OBDII.h" |
| AliBros | 0:5b4bcf184488 | 3 | #include "globals.h" |
| AliBros | 0:5b4bcf184488 | 4 | |
| AliBros | 0:5b4bcf184488 | 5 | |
| AliBros | 0:5b4bcf184488 | 6 | // Use a timer to see if things take too long |
| AliBros | 1:4b7c280d433d | 7 | Timer CANTimer; |
| AliBros | 1:4b7c280d433d | 8 | namespace mbed { |
| AliBros | 1:4b7c280d433d | 9 | OBDII::OBDII(int can_speed) { |
| AliBros | 0:5b4bcf184488 | 10 | can2.frequency(can_speed); |
| AliBros | 0:5b4bcf184488 | 11 | } |
| AliBros | 0:5b4bcf184488 | 12 | |
| AliBros | 0:5b4bcf184488 | 13 | #define TIMEOUT 200 |
| AliBros | 1:4b7c280d433d | 14 | //function to request and OBD PID which will be placed in a buffer |
| AliBros | 1:4b7c280d433d | 15 | unsigned char OBDII::request(unsigned char pid, char *buffer) { |
| AliBros | 0:5b4bcf184488 | 16 | char can_msg[8]; |
| AliBros | 0:5b4bcf184488 | 17 | float engine_data; |
| AliBros | 1:4b7c280d433d | 18 | |
| AliBros | 1:4b7c280d433d | 19 | |
| AliBros | 1:4b7c280d433d | 20 | //forming the CAN message payload |
| AliBros | 1:4b7c280d433d | 21 | can_msg[0] = 0x02; |
| AliBros | 0:5b4bcf184488 | 22 | can_msg[1] = 0x01; |
| AliBros | 1:4b7c280d433d | 23 | can_msg[2] = pid; |
| AliBros | 0:5b4bcf184488 | 24 | can_msg[3] = 0; |
| AliBros | 1:4b7c280d433d | 25 | can_msg[4] = 0; |
| AliBros | 0:5b4bcf184488 | 26 | can_msg[5] = 0; |
| AliBros | 1:4b7c280d433d | 27 | can_msg[6] = 0; |
| AliBros | 0:5b4bcf184488 | 28 | can_msg[7] = 0; |
| AliBros | 0:5b4bcf184488 | 29 | |
| AliBros | 1:4b7c280d433d | 30 | if (can2.write(CANMessage(PID_REQUEST, can_msg, 8))) { |
| AliBros | 1:4b7c280d433d | 31 | |
| AliBros | 0:5b4bcf184488 | 32 | } |
| AliBros | 1:4b7c280d433d | 33 | |
| AliBros | 1:4b7c280d433d | 34 | CANTimer.reset(); |
| AliBros | 1:4b7c280d433d | 35 | CANTimer.start(); |
| AliBros | 1:4b7c280d433d | 36 | |
| AliBros | 1:4b7c280d433d | 37 | while (CANTimer.read_ms() < TIMEOUT) { |
| AliBros | 1:4b7c280d433d | 38 | |
| AliBros | 1:4b7c280d433d | 39 | if (can2.read(can_MsgRx)) { |
| AliBros | 1:4b7c280d433d | 40 | |
| AliBros | 1:4b7c280d433d | 41 | if ((can_MsgRx.id == PID_REPLY) && (can_MsgRx.data[2] == pid)) { |
| AliBros | 1:4b7c280d433d | 42 | switch (can_MsgRx.data[2]) { |
| AliBros | 1:4b7c280d433d | 43 | case ENGINE_RPM: // ((A*256)+B)/4 [RPM] |
| AliBros | 1:4b7c280d433d | 44 | engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/4; |
| AliBros | 1:4b7c280d433d | 45 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 1:4b7c280d433d | 46 | break; |
| AliBros | 1:4b7c280d433d | 47 | |
| AliBros | 1:4b7c280d433d | 48 | case ENGINE_COOLANT_TEMP: // A-40 [degree C] |
| AliBros | 1:4b7c280d433d | 49 | engine_data = can_MsgRx.data[3] - 40; |
| AliBros | 1:4b7c280d433d | 50 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 1:4b7c280d433d | 51 | |
| AliBros | 1:4b7c280d433d | 52 | break; |
| AliBros | 1:4b7c280d433d | 53 | |
| AliBros | 1:4b7c280d433d | 54 | case VEHICLE_SPEED: // A [km] |
| AliBros | 1:4b7c280d433d | 55 | engine_data = can_MsgRx.data[3]; |
| AliBros | 1:4b7c280d433d | 56 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 1:4b7c280d433d | 57 | |
| AliBros | 1:4b7c280d433d | 58 | break; |
| AliBros | 0:5b4bcf184488 | 59 | |
| AliBros | 1:4b7c280d433d | 60 | case MAF_SENSOR: // ((256*A)+B) / 100 [g/s] |
| AliBros | 1:4b7c280d433d | 61 | engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/100; |
| AliBros | 1:4b7c280d433d | 62 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 1:4b7c280d433d | 63 | |
| AliBros | 1:4b7c280d433d | 64 | break; |
| AliBros | 1:4b7c280d433d | 65 | |
| AliBros | 1:4b7c280d433d | 66 | case O2_VOLTAGE: // A * 0.005 (B-128) * 100/128 (if B==0xFF, sensor is not used in trim calc) |
| AliBros | 1:4b7c280d433d | 67 | engine_data = can_MsgRx.data[3]*0.005; |
| AliBros | 1:4b7c280d433d | 68 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 1:4b7c280d433d | 69 | |
| AliBros | 1:4b7c280d433d | 70 | case THROTTLE: // |
| AliBros | 1:4b7c280d433d | 71 | engine_data = (can_MsgRx.data[3]*100)/255; |
| AliBros | 1:4b7c280d433d | 72 | sprintf(buffer,"%d",(int) engine_data); |
| AliBros | 0:5b4bcf184488 | 73 | |
| AliBros | 1:4b7c280d433d | 74 | |
| AliBros | 1:4b7c280d433d | 75 | break; |
| AliBros | 1:4b7c280d433d | 76 | } |
| AliBros | 1:4b7c280d433d | 77 | |
| AliBros | 0:5b4bcf184488 | 78 | return 1; |
| AliBros | 1:4b7c280d433d | 79 | |
| AliBros | 1:4b7c280d433d | 80 | } |
| AliBros | 0:5b4bcf184488 | 81 | |
| AliBros | 1:4b7c280d433d | 82 | } |
| AliBros | 1:4b7c280d433d | 83 | } |
| AliBros | 0:5b4bcf184488 | 84 | |
| AliBros | 1:4b7c280d433d | 85 | return 0; |
| AliBros | 1:4b7c280d433d | 86 | |
| AliBros | 0:5b4bcf184488 | 87 | |
| AliBros | 0:5b4bcf184488 | 88 | |
| AliBros | 0:5b4bcf184488 | 89 | |
| AliBros | 0:5b4bcf184488 | 90 | } |
| AliBros | 1:4b7c280d433d | 91 | } |