Forum >Replies by budmc77
Replies （2）
- You Reply: Thanks but I'm still getting the same results even with a different sketch name. Any other suggestions?
- You Reply: Stanley,
I'm still getting the error even with the updated library. The cpp and header is in my Arudino library's folder and I know its recognizing it because if I comment out #include <OBD.h> I get the error...
[code]
rpm_led:11: error: 'COBD' does not name a type
rpm_led.ino: In function 'void setup()':
rpm_led:18: error: 'obd' was not declared in this scope
rpm_led.ino: In function 'void loop()':
rpm_led:26: error: 'obd' was not declared in this scope
rpm_led:26: error: 'PID_RPM' was not declared in this scope[/code]
as oppose to
[code]rpm_led.ino: In function 'void setup()':
rpm_led:18: error: 'class COBD' has no member named 'begin'
rpm_led:20: error: 'class COBD' has no member named 'init'
rpm_led.ino: In function 'void loop()':
rpm_led:26: error: 'class COBD' has no member named 'readSensor'
[/code]
Any suggestions?
OBD.h
[code]/*************************************************************************
* Arduino Library for OBD-II UART Adapter
* Distributed under GPL v2.0
* Copyright (c) 2012~2013 Stanley Huang <[email protected]>
* All rights reserved.
*************************************************************************/
#define OBD_TIMEOUT_SHORT 2000 /* ms */
#define OBD_TIMEOUT_LONG 7000 /* ms */
#define OBD_TIMEOUT_INIT 3000 /* ms */
#define OBD_SERIAL_BAUDRATE 38400
#define OBD_RECV_BUF_SIZE 64
#ifndef OBDUART
#if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
#define OBDUART Serial1
#else
#define OBDUART Serial
#endif
#endif
// mode 0 pids
#define PID_RPM 0x0C
#define PID_SPEED 0x0D
#define PID_THROTTLE 0x11
#define PID_ENGINE_LOAD 0x04
#define PID_COOLANT_TEMP 0x05
#define PID_INTAKE_TEMP 0x0F
#define PID_MAF_FLOW 0x10
#define PID_ABS_ENGINE_LOAD 0x43
#define PID_AMBIENT_TEMP 0x46
#define PID_FUEL_PRESSURE 0x0A
#define PID_INTAKE_MAP 0x0B
#define PID_BAROMETRIC 0x33
#define PID_TIMING_ADVANCE 0x0E
#define PID_FUEL_LEVEL 0x2F
#define PID_RUNTIME 0x1F
#define PID_DISTANCE 0x31
unsigned int hex2uint16(const char *p);
unsigned char hex2uint8(const char *p);
class COBD
{
public:
COBD():dataMode(1),errors(0) {}
void begin();
bool init(bool passive = false);
bool readSensor(byte pid, int& result, bool passive = false);
bool isValidPID(byte pid);
void sleep(int seconds);
// Query and GetResponse for advanced usage only
void sendQuery(byte pid);
char* getResponse(byte& pid, char* buffer);
bool getResponseParsed(byte& pid, int& result);
byte dataMode;
byte errors;
//char recvBuf[OBD_RECV_BUF_SIZE];
protected:
static int normalizeData(byte pid, char* data);
static int getPercentageValue(char* data)
{
return (int)hex2uint8(data) * 100 / 255;
}
static int getLargeValue(char* data)
{
return hex2uint16(data);
}
static int getSmallValue(char* data)
{
return hex2uint8(data);
}
static int getTemperatureValue(char* data)
{
return (int)hex2uint8(data) - 40;
}
virtual bool available();
virtual char read();
virtual void write(const char* s);
virtual void write(const char c);
virtual void initIdleLoop() {}
virtual void dataIdleLoop() {}
byte pidmap[4 * 4];
byte vin[17];
};[/code]
OBD.cpp
[code]/*************************************************************************
* Arduino Library for OBD-II UART Adapter
* Distributed under GPL v2.0
* Copyright (c) 2012~2013 Stanley Huang <[email protected]>
* All rights reserved.
*************************************************************************/
#include <Arduino.h>
#include <avr/pgmspace.h>
#include "OBD.h"
#define MAX_CMD_LEN 6
const char PROGMEM s_initcmd[][MAX_CMD_LEN] = {"ATZ\r","ATE0\r","ATL1\r"};
const char PROGMEM s_searching[] = "SEARCHING";
const char PROGMEM s_cmd_fmt[] = "%02X%02X 1\r";
const char PROGMEM s_cmd_sleep[] = "atlp\r";
const char PROGMEM s_cmd_vin[] = "0902\r";
unsigned int hex2uint16(const char *p)
{
char c = *p;
unsigned int i = 0;
for (char n = 0; c && n < 4; c = *(++p)) {
if (c >= 'A' && c <= 'F') {
c -= 7;
} else if (c>='a' && c<='f') {
c -= 39;
} else if (c == ' ') {
continue;
} else if (c < '0' || c > '9') {
break;
}
i = (i << 4) | (c & 0xF);
n++;
}
return i;
}
unsigned char hex2uint8(const char *p)
{
unsigned char c1 = *p;
unsigned char c2 = *(p + 1);
if (c1 >= 'A' && c1 <= 'F')
c1 -= 7;
else if (c1 >='a' && c1 <= 'f')
c1 -= 39;
else if (c1 < '0' || c1 > '9')
return 0;
if (c2 >= 'A' && c2 <= 'F')
c2 -= 7;
else if (c2 >= 'a' && c2 <= 'f')
c2 -= 39;
else if (c2 < '0' || c2 > '9')
return 0;
return c1 << 4 | (c2 & 0xf);
}
void COBD::sendQuery(unsigned char pid)
{
char cmd[8];
sprintf_P(cmd, s_cmd_fmt, dataMode, pid);
write(cmd);
}
bool COBD::readSensor(byte pid, int& result, bool passive)
{
// send a query command
sendQuery(pid);
// wait for reponse
bool hasData;
unsigned long tick = millis();
do {
dataIdleLoop();
} while (!(hasData = available()) && millis() - tick < OBD_TIMEOUT_SHORT);
if (!hasData) {
write('\r');
errors++;
return false;
}
// receive and parse the response
return getResponseParsed(pid, result);
}
bool COBD::available()
{
return OBDUART.available();
}
char COBD::read()
{
char c = OBDUART.read();
return c;
}
void COBD::write(const char* s)
{
OBDUART.write(s);
}
void COBD::write(const char c)
{
OBDUART.write(c);
}
int COBD::normalizeData(byte pid, char* data)
{
int result;
switch (pid) {
case PID_RPM:
result = getLargeValue(data) >> 2;
break;
case PID_FUEL_PRESSURE:
result = getSmallValue(data) * 3;
break;
case PID_COOLANT_TEMP:
case PID_INTAKE_TEMP:
case PID_AMBIENT_TEMP:
result = getTemperatureValue(data);
break;
case PID_ABS_ENGINE_LOAD:
result = getLargeValue(data) * 100 / 255;
break;
case PID_MAF_FLOW:
result = getLargeValue(data) / 100;
break;
case PID_THROTTLE:
case PID_ENGINE_LOAD:
case PID_FUEL_LEVEL:
result = getPercentageValue(data);
break;
case PID_TIMING_ADVANCE:
result = (getSmallValue(data) - 128) >> 1;
break;
case PID_DISTANCE:
case PID_RUNTIME:
result = getLargeValue(data);
break;
default:
result = getSmallValue(data);
}
return result;
}
char* COBD::getResponse(byte& pid, char* buffer)
{
unsigned long startTime = millis();
static const char responseSign[3] = {'4', '1', ' '};
byte i = 0;
for (;;) {
if (available()) {
char c = read();
buffer[i] = c;
if (++i == OBD_RECV_BUF_SIZE - 1) {
// buffer overflow
break;
}
if (c == '>' && i > 6) {
// prompt char reached
break;
}
} else {
buffer[i] = 0;
unsigned int timeout;
if (dataMode != 1 || strstr_P(buffer, s_searching)) {
timeout = OBD_TIMEOUT_LONG;
} else {
timeout = OBD_TIMEOUT_SHORT;
}
if (millis() - startTime > timeout) {
// timeout
errors++;
break;
}
dataIdleLoop();
}
}
buffer[i] = 0;
if (i > 6) {
char *p = buffer;
while ((p = strstr(p, responseSign))) {
p += 3;
byte curpid = hex2uint8(p);
if (pid == 0) pid = curpid;
if (curpid == pid) {
errors = 0;
p += 2;
if (*p == ' ')
return p + 1;
}
};
}
return 0;
}
bool COBD::getResponseParsed(byte& pid, int& result)
{
char buffer[OBD_RECV_BUF_SIZE];
char* data = getResponse(pid, buffer);
if (!data) {
// try recover next time
write('\r');
return false;
}
result = normalizeData(pid, data);
return true;
}
void COBD::sleep(int seconds)
{
char cmd[MAX_CMD_LEN];
strcpy_P(cmd, s_cmd_sleep);
write(cmd);
if (seconds) {
delay((unsigned long)seconds << 10);
write('\r');
}
}
bool COBD::isValidPID(byte pid)
{
if (pid >= 0x7f)
return false;
pid--;
byte i = pid >> 3;
byte b = 0x80 >> (pid & 0x7);
return pidmap[i] & b;
}
void COBD::begin()
{
OBDUART.begin(OBD_SERIAL_BAUDRATE);
}
bool COBD::init(bool passive)
{
unsigned long currentMillis;
unsigned char n;
char prompted;
char buffer[OBD_RECV_BUF_SIZE];
for (unsigned char i = 0; i < sizeof(s_initcmd) / sizeof(s_initcmd[0]); i++) {
if (!passive) {
char cmd[MAX_CMD_LEN];
strcpy_P(cmd, s_initcmd[i]);
write(cmd);
}
n = 0;
prompted = 0;
currentMillis = millis();
for (;;) {
if (available()) {
char c = read();
if (n > 2 && c == '>') {
buffer[n] = 0;
prompted++;
} else if (n < OBD_RECV_BUF_SIZE - 1) {
buffer[n++] = c;
}
} else if (prompted) {
break;
} else {
unsigned long elapsed = millis() - currentMillis;
if (elapsed > OBD_TIMEOUT_INIT) {
// init timeout
//WriteData("\r");
return false;
}
initIdleLoop();
}
}
}
while (available()) read();
// load pid map
memset(pidmap, 0, sizeof(pidmap));
for (byte i = 0; i < 4; i++) {
byte pid = i * 0x20;
sendQuery(pid);
char* data = getResponse(pid, buffer);
if (!data) break;
data--;
for (byte n = 0; n < 4; n++) {
if (data[n * 3] != ' ')
break;
pidmap[i * 4 + n] = hex2uint8(data + n * 3 + 1);
}
}
while (available()) read();
errors = 0;
return true;
}[/code]
OBD.ino
[code]/*************************************************************************
* Sample sketch based on OBD-II library for Arduino
* Distributed under GPL v2.0
* Copyright (c) 2012-2013 Stanley Huang <[email protected]>
* All rights reserved.
*************************************************************************/
#include <Arduino.h>
#include "OBD.h"
COBD obd;
void setup()
{
// we'll use the debug LED as output
pinMode(13, OUTPUT);
// start communication with OBD-II UART adapter
obd.begin();
// initiate OBD-II connection until success
while (!obd.init());
}
void loop()
{
int value;
if (obd.readSensor(PID_RPM, value)) {
// RPM is read and stored in 'value'
// light on LED when RPM exceeds 5000
digitalWrite(13, value > 5000 ? HIGH : LOW);
}
}[/code]