Arduino loop

--D. Thiebaut 17:08, 1 November 2008 (UTC)

Status: could make arduino-serial.c program send commands and read from Arduino

arduino-serial.c

/*
 * Arduino-serial
 * --------------
 * 
 * A simple command-line example program showing how a computer can
 * communicate with an Arduino board. Works on any POSIX system (Mac/Unix/PC) 
 *
 *
 * Compile with something like:
 * gcc -o arduino-serial arduino-serial.c
 *
 * Created 5 December 2006
 * Copyleft (c) 2006, Tod E. Kurt, tod@todbot.com
 * http://todbot.com/blog/
 *
 * 
 * Updated 8 December 2006: 
 *  Justin McBride discoevered B14400 & B28800 aren't in Linux's termios.h.
 *  I've included his patch, but commented out for now.  One really needs a
 *  real make system when doing cross-platform C and I wanted to avoid that
 *  for this little program. Those baudrates aren't used much anyway. :)
 *
 * Updated 26 December 2007:
 *  Added ability to specify a delay (so you can wait for Arduino Diecimila)
 *  Added ability to send a binary byte number
 *
 * Update 31 August 2008:
 *  Added patch to clean up odd baudrates from Andy at hexapodia.org
 *
 */

#include <stdio.h>    /* Standard input/output definitions */
#include <stdlib.h> 
#include <stdint.h>   /* Standard types */
#include <string.h>   /* String function definitions */
#include <unistd.h>   /* UNIX standard function definitions */
#include <fcntl.h>    /* File control definitions */
#include <errno.h>    /* Error number definitions */
#include <termios.h>  /* POSIX terminal control definitions */
#include <sys/ioctl.h>
#include <getopt.h>

void usage(void);
int serialport_init(const char* serialport, int baud);
int serialport_writebyte(int fd, uint8_t b);
int serialport_write(int fd, const char* str);
int serialport_read_until(int fd, char* buf, char until);

void usage(void) {
    printf("Usage: arduino-serial -p <serialport> [OPTIONS]\n"
    "\n"
    "Options:\n"
    "  -h, --help                   Print this help message\n"
    "  -p, --port=serialport        Serial port Arduino is on\n"
    "  -b, --baud=baudrate          Baudrate (bps) of Arduino\n"
    "  -s, --send=data              Send data to Arduino\n"
    "  -r, --receive                Receive data from Arduino & print it out\n"
    "  -n  --num=num                Send a number as a single byte\n"
    "  -d  --delay=millis           Delay for specified milliseconds\n"
    "\n"
    "Note: Order is important. Set '-b' before doing '-p'. \n"
    "      Used to make series of actions:  '-d 2000 -s hello -d 100 -r' \n"
    "      means 'wait 2secs, send 'hello', wait 100msec, get reply'\n"
    "\n");
}

int main(int argc, char *argv[]) 
{
    int fd = 0;
    char serialport[256];
    int baudrate = B9600;  // default
    char buf[256];
    int rc,n;

    if (argc==1) {
        usage();
        exit(EXIT_SUCCESS);
    }

    /* parse options */
    int option_index = 0, opt;
    static struct option loptions[] = {
        {"help",       no_argument,       0, 'h'},
        {"port",       required_argument, 0, 'p'},
        {"baud",       required_argument, 0, 'b'},
        {"send",       required_argument, 0, 's'},
        {"receive",    no_argument,       0, 'r'},
        {"num",        required_argument, 0, 'n'},
        {"delay",      required_argument, 0, 'd'}
    };
    
    while(1) {
        opt = getopt_long (argc, argv, "hp:b:s:rn:d:",
                           loptions, &option_index);
        if (opt==-1) break;
        switch (opt) {
        case '0': break;
        case 'd':
            n = strtol(optarg,NULL,10);
            usleep(n * 1000 ); // sleep milliseconds
            break;
        case 'h':
            usage();
            break;
        case 'b':
            baudrate = strtol(optarg,NULL,10);
            break;
        case 'p':
            strcpy(serialport,optarg);
            fd = serialport_init(optarg, baudrate);
            if(fd==-1){
	      printf( "Could not initialize USB port\n\n" );
	      return -1;
	    }
            break;
        case 'n':
            n = strtol(optarg, NULL, 10); // convert string to number
            rc = serialport_writebyte(fd, (uint8_t)n);
            if(rc==-1) return -1;
            break;
        case 's':
            strcpy(buf,optarg);
            rc = serialport_write(fd, buf);
            if(rc==-1) return -1;
            break;
        case 'r':
            serialport_read_until(fd, buf, '\n');
            printf("read: %s\n",buf);
            break;
        }
    }

    exit(EXIT_SUCCESS);    
} // end main
    
int serialport_writebyte( int fd, uint8_t b)
{
    int n = write(fd,&b,1);
    if( n!=1)
        return -1;
    return 0;
}

int serialport_write(int fd, const char* str) {
  int len;
  char buff[1024];
  strcpy( buff, str );
  strcat( buff, "\n" );
  len = strlen(buff);
  int n = write(fd, buff, len);
  if( n!=len ) 
    return -1;
  return 0;
}

int serialport_read_until(int fd, char* buf, char until) {
    char b[1];
    int i=0, k;
    do { 
        int n = read(fd, b, 1);  // read a char at a time
        if( n==-1) {
	  usleep( 100*1000 );
	  continue;
	}
        if( n==0 ) {
            usleep( 10 * 1000 ); // wait 10 msec try again
            continue;
        }
	buf[i] = b[0];
	i++;
    } while( b[0] != until );

    buf[i] = 0;  // null terminate the string
    return 0;
}

// takes the string name of the serial port (e.g. "/dev/tty.usbserial","COM1")
// and a baud rate (bps) and connects to that port at that speed and 8N1.
// opens the port in fully raw mode so you can send binary data.
// returns valid fd, or -1 on error
int serialport_init(const char* serialport, int baud)
{
    struct termios toptions;
    int fd;
    
    //fprintf(stderr,"init_serialport: opening port %s @ %d bps\n",
    //        serialport,baud);

    fd = open(serialport, O_RDWR | O_NOCTTY | O_NDELAY);
    if (fd == -1)  {
        perror("init_serialport: Unable to open port ");
        return -1;
    }
    
    if (tcgetattr(fd, &toptions) < 0) {
        perror("init_serialport: Couldn't get term attributes");
        return -1;
    }
    speed_t brate = baud; // let you override switch below if needed
    switch(baud) {
    case 4800:   brate=B4800;   break;
    case 9600:   brate=B9600;   break;
#ifdef B14400
    case 14400:  brate=B14400;  break;
#endif
    case 19200:  brate=B19200;  break;
#ifdef B28800
    case 28800:  brate=B28800;  break;
#endif
    case 38400:  brate=B38400;  break;
    case 57600:  brate=B57600;  break;
    case 115200: brate=B115200; break;
    }
    cfsetispeed(&toptions, brate);
    cfsetospeed(&toptions, brate);

    // 8N1
    toptions.c_cflag &= ~PARENB;
    toptions.c_cflag &= ~CSTOPB;
    toptions.c_cflag &= ~CSIZE;
    toptions.c_cflag |= CS8;
    // no flow control
    toptions.c_cflag &= ~CRTSCTS;

    toptions.c_cflag |= CREAD | CLOCAL;  // turn on READ & ignore ctrl lines
    toptions.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl

    toptions.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); // make raw
    toptions.c_oflag &= ~OPOST; // make raw

    // see: http://unixwiz.net/techtips/termios-vmin-vtime.html
    toptions.c_cc[VMIN]  = 0;
    toptions.c_cc[VTIME] = 20;
    
    if( tcsetattr(fd, TCSANOW, &toptions) < 0) {
        perror("init_serialport: Couldn't set term attributes");
        return -1;
    }

    return fd;
}

arduino-loop.pde

// ===============================
// arduino-loop.pde
// D. Thiebaut
// 11/6/08
// Similar to the simpleMessageSystem, but uses
//  no library.  Listens to the USB port for commands
//  of the type "w d 13 1" (write 1 to digital pin 13)
//  or of the type "r d" (read digital pins)
// Sends the string "OK\n" after processing a command
//  whether it is processed successfully or not.  
// ===============================

// -------------------------------------------------------------
// GLOBALS
// -------------------------------------------------------------
char buffer[256];
int len;
char *operation;
char *mode;
char *pin;
char *state;

// -------------------------------------------------------------
// PROTOTYPES
// -------------------------------------------------------------
void resetAll();
int process();
int writePin( char mode, int pin, int state );
int readPins( char mode );

// -------------------------------------------------------------
// SETUP: initializes port and buffer
// -------------------------------------------------------------
void setup() {
    Serial.begin(9600); 
    resetAll();
}

// -------------------------------------------------------------
// RESETALL: clears the buffer and the globals
// -------------------------------------------------------------
void resetAll() {
    buffer[0] = '\0';
    len       = 0;
    operation = mode = pin = state = 0;
}

// -------------------------------------------------------------
// LOOP: main workhorse.  Called repeatedly.  Gets chars from 
//       the arduino, and processes it when \n received
// -------------------------------------------------------------
void loop() {

    int c;
    c = Serial.read();

    // nothing received, nothing to do
    if (c==-1) return;
    
    // \n terminator received, process message
    if ( c=='\n' ) {
        if ( process() ) {
	   Serial.println( "Error" );
	}
        Serial.println( "OK" );
        resetAll();
        return;
    }
         
    // something received, but not \n. add to buffer
    buffer[ len++ ] = c;
    buffer[ len ] = '\0';
}

// -------------------------------------------------------------
// MYSTRTOK: equivalent to C strtok function that doesn't seem
//           supported by arduino.  Given a pointer to a string
//           p, returns a pointer q past p that points to a char
//           that is not a space.  If cannot find one, return
//           NULL.
// -------------------------------------------------------------
char* mystrtok( char* p, int skipNonBlank ) {
    char* q=p;
    if ( skipNonBlank ) {
        for ( ; *q != ' ' && *q != '\0'; q++ );
        if ( *q=='\0' ) return NULL;
    }
    for ( ; *q != '\0' && *q==' '; q++ );
    if ( *q == '\0' ) return NULL;
    if ( *q == ' ' ) return NULL;
    return q;
}

// -------------------------------------------------------------
// PROCESS: if we're here it's because we have received a message
//          from the UBUNTU PC.
// -------------------------------------------------------------
int process() {
    char *p;
    int len = strlen( buffer );
    int intPin;
    int intState;

    //Serial.print( "buffer = " );
    //Serial.print( buffer );
    
    //--- if message less than 3 chars long, return ---
    if ( len < 3 ) {
        resetAll();
        return 1; //error
    }

    //--- get the operation: 'w' or 'r'.  Do some error checking---
    operation = mystrtok( buffer, 0 );

    if ( ( !operation || (*operation!='r' && *operation!='w') ) 
         || ( ( *operation=='r' && len < 3 ) ||( *operation=='w' && len < 7 ) ) ) {
        resetAll();
        return 1; // error
    }

    //--- get the mode: 'd' or 'a' and do some error checking ---
    mode = mystrtok( operation + 1, 0 );
    if (  !mode || ( *mode!='a' && *mode!='d' ) ) {
        resetAll();
        return 1; // success
    }

    //--- if operation is 'r' read the pins ---
    if ( *operation == 'r' ) {
        readPins( *mode );
        resetAll();
        return 0; // success
    }

    //--- if not, operation is 'w', then get pin # and state ---
    pin = mystrtok( mode + 1, 0 );
    if ( !pin ) {
        resetAll();
        return 1; // error
    }
    intPin = atoi( pin );
    if ( intPin < 2 || intPin > 13 ) {
        resetAll();
        return 1; // error
    }
    
    //--- get the state of the output pin ---
    state = mystrtok( pin+1, 1 );
    if ( !state ) {
        resetAll();
        return 1; // error 
    }
    intState = atoi( state );
    if ( intState < 0 || intState > 1 ) {
        resetAll();
        return 1; // error
    }
    
    //--- write the state to the pin in question ---
    writePin( *mode, intPin, intState );

    resetAll();
    return 0;
}

// -------------------------------------------------------------
// WRITEPIN: depending on mode, writes the state to the pin
// -------------------------------------------------------------
int writePin( char mode, int  intPin, int intState ) {
    if ( mode=='d' )
        digitalWrite( intPin, intState );
    if ( mode=='a' )
        analogWrite( intPin, intState );
    return 0;
}

// -------------------------------------------------------------
// READPINS: read the status of all the pins and returns it as
//      a string.
// -------------------------------------------------------------
int readPins( char mode ) {
  int i;
  if ( mode=='d' ) {
        Serial.print( "d " );
        for ( i=2; i<14; i++ ) {
            Serial.print( digitalRead( i ) );
            Serial.print( ' ' );
        }
  }
  if ( mode=='a' ) {
        Serial.print( "a " );
        for ( i=0; i<6; i++ ) {
            Serial.print( analogRead( i ) );
            Serial.print( ' ' );
        }
  }
  Serial.println();
  return 0;
}