Ali Bros
/
OBDII
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Revision 1:4b7c280d433d, committed 2011-05-02
- Comitter:
- AliBros
- Date:
- Mon May 02 04:34:18 2011 +0000
- Parent:
- 0:5b4bcf184488
- Commit message:
Changed in this revision
--- a/OBDII.cpp Mon May 02 02:46:26 2011 +0000
+++ b/OBDII.cpp Mon May 02 04:34:18 2011 +0000
@@ -4,94 +4,88 @@
// Use a timer to see if things take too long
-Timer CANTimer;
-namespace mbed {
-
-
-OBDII::OBDII(int can_speed)
-{
+Timer CANTimer;
+namespace mbed {
+OBDII::OBDII(int can_speed) {
can2.frequency(can_speed);
}
#define TIMEOUT 200
-unsigned char OBDII::request(unsigned char pid, char *buffer)
-{
+//function to request and OBD PID which will be placed in a buffer
+unsigned char OBDII::request(unsigned char pid, char *buffer) {
char can_msg[8];
float engine_data;
-
- led1 = 1;
-
- can_msg[0] = 0x02;
+
+
+ //forming the CAN message payload
+ can_msg[0] = 0x02;
can_msg[1] = 0x01;
- can_msg[2] = pid;
+ can_msg[2] = pid;
can_msg[3] = 0;
- can_msg[4] = 0;
+ can_msg[4] = 0;
can_msg[5] = 0;
- can_msg[6] = 0;
+ can_msg[6] = 0;
can_msg[7] = 0;
- if (can2.write(CANMessage(PID_REQUEST, can_msg, 8))) {
-
+ if (can2.write(CANMessage(PID_REQUEST, can_msg, 8))) {
+
}
-
- led1 = 0;
- CANTimer.reset();
- CANTimer.start();
-
- while(CANTimer.read_ms() < TIMEOUT) {
-
- if (can2.read(can_MsgRx)) {
-
- if((can_MsgRx.id == PID_REPLY) && (can_MsgRx.data[2] == pid))
- {
- switch(can_MsgRx.data[2])
- { /* Details from http://en.wikipedia.org/wiki/OBD-II_PIDs */
- case ENGINE_RPM: // ((A*256)+B)/4 [RPM]
- engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/4;
- sprintf(buffer,"%d",(int) engine_data);
- break;
-
- case ENGINE_COOLANT_TEMP: // A-40 [degree C]
- engine_data = can_MsgRx.data[3] - 40;
- sprintf(buffer,"%d",(int) engine_data);
-
- break;
-
- case VEHICLE_SPEED: // A [km]
- engine_data = can_MsgRx.data[3];
- sprintf(buffer,"%d",(int) engine_data);
-
- break;
+
+ CANTimer.reset();
+ CANTimer.start();
+
+ while (CANTimer.read_ms() < TIMEOUT) {
+
+ if (can2.read(can_MsgRx)) {
+
+ if ((can_MsgRx.id == PID_REPLY) && (can_MsgRx.data[2] == pid)) {
+ switch (can_MsgRx.data[2]) {
+ case ENGINE_RPM: // ((A*256)+B)/4 [RPM]
+ engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/4;
+ sprintf(buffer,"%d",(int) engine_data);
+ break;
+
+ case ENGINE_COOLANT_TEMP: // A-40 [degree C]
+ engine_data = can_MsgRx.data[3] - 40;
+ sprintf(buffer,"%d",(int) engine_data);
+
+ break;
+
+ case VEHICLE_SPEED: // A [km]
+ engine_data = can_MsgRx.data[3];
+ sprintf(buffer,"%d",(int) engine_data);
+
+ break;
- case MAF_SENSOR: // ((256*A)+B) / 100 [g/s]
- engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/100;
- sprintf(buffer,"%d",(int) engine_data);
-
- break;
+ case MAF_SENSOR: // ((256*A)+B) / 100 [g/s]
+ engine_data = ((can_MsgRx.data[3]*256) + can_MsgRx.data[4])/100;
+ sprintf(buffer,"%d",(int) engine_data);
+
+ break;
+
+ case O2_VOLTAGE: // A * 0.005 (B-128) * 100/128 (if B==0xFF, sensor is not used in trim calc)
+ engine_data = can_MsgRx.data[3]*0.005;
+ sprintf(buffer,"%d",(int) engine_data);
+
+ case THROTTLE: //
+ engine_data = (can_MsgRx.data[3]*100)/255;
+ sprintf(buffer,"%d",(int) engine_data);
- case O2_VOLTAGE: // A * 0.005 (B-128) * 100/128 (if B==0xFF, sensor is not used in trim calc)
- engine_data = can_MsgRx.data[3]*0.005;
- sprintf(buffer,"%d",(int) engine_data);
-
- case THROTTLE: //
- engine_data = (can_MsgRx.data[3]*100)/255;
- sprintf(buffer,"%d",(int) engine_data);
-
-
- break;
- }
-
+
+ break;
+ }
+
return 1;
-
- }
+
+ }
- }
- }
+ }
+ }
- return 0;
-
+ return 0;
+
}
-} // namespace mbed
\ No newline at end of file
+}
\ No newline at end of file
--- a/OBDII.h Mon May 02 02:46:26 2011 +0000
+++ b/OBDII.h Mon May 02 04:34:18 2011 +0000
@@ -1,11 +1,13 @@
#ifndef OBDII_H
#define OBDII_H
+//Can Speed
+#define CANSPEED_125 125000
+#define CANSPEED_250 250000
+#define CANSPEED_500 500000
-#define CANSPEED_125 125000 // CAN speed at 125 kbps
-#define CANSPEED_250 250000 // CAN speed at 250 kbps
-#define CANSPEED_500 500000 // CAN speed at 500 kbps
-
- /* Details from http://en.wikipedia.org/wiki/OBD-II_PIDs */
+/* Details from http://en.wikipedia.org/wiki/OBD-II_PIDs
+to add more options simply find the required PIDs from
+http://en.wikipedia.org/wiki/OBD-II_PIDs and define them*/
#define ENGINE_COOLANT_TEMP 0x05
#define ENGINE_RPM 0x0C
#define VEHICLE_SPEED 0x0D
@@ -13,31 +15,23 @@
#define THROTTLE 0x11
#define O2_VOLTAGE 0x14
+
#define PID_REQUEST 0x7DF
#define PID_REPLY 0x7E8
-namespace mbed {
+namespace mbed {
-class OBDII{
+class OBDII {
public:
-
OBDII(int can_speed);
-
unsigned char request(unsigned char pid, char *buffer);
-private:
+private:
+ int i;
- int i;
-
};
-
-
-
-
- }
-
-
+}
#endif
\ No newline at end of file
--- a/globals.cpp Mon May 02 02:46:26 2011 +0000 +++ b/globals.cpp Mon May 02 04:34:18 2011 +0000 @@ -1,12 +1,5 @@ #include "globals.h" - Serial pc (USBTX,USBRX); - -DigitalOut led1 (LED1); -DigitalOut led2 (LED2); -DigitalOut led3 (LED3); -DigitalOut led4 (LED4); - -// We use can on mbed pins 29(CAN_TXD) and 30(CAN_RXD). +// Using mbed pins 29(CAN_TXD) and 30(CAN_RXD) CAN can2(p30, p29); CANMessage can_MsgRx; \ No newline at end of file
--- a/globals.h Mon May 02 02:46:26 2011 +0000 +++ b/globals.h Mon May 02 04:34:18 2011 +0000 @@ -4,12 +4,8 @@ #include "mbed.h" extern Serial pc; -extern DigitalOut led1; -extern DigitalOut led2; -extern DigitalOut led3; -extern DigitalOut led4; -// We use can on mbed pins 29(CAN_TXD) and 30(CAN_RXD). +// Using mbed pins 29(CAN_TXD) and 30(CAN_RXD). extern CAN can2; extern CANMessage can_MsgRx; #endif \ No newline at end of file