objective c - Arduino State Machine -

this cross-post answered original question here.

i'm not sure how go executing 3 functions i'm after (as introducing more 3 in future).

i trying fade/blink selected colour of rgb led (and perhaps introduce more functions in future) rgb data coming ios , sent rfduino ble module.

sends "fade" string module picked rfduinoble_onreceive (char *data, int len) on arduino end.

- (ibaction)fadebuttonpressed:(id)sender {     [rfduino send:[@"fade" datausingencoding:nsutf8stringencoding]]; }  - (ibaction)blinkbuttonpressed:(id)sender {     [rfduino send:[@"blink" datausingencoding:nsutf8stringencoding]]; } 

selected color:

- (void)setcolor {     nslog(@"colors: rgb %f %f %f", red, green, blue);      uicolor *color = [uicolor colorwithred:red green:green blue:blue alpha:1.0];      [colorswatch sethighlighted:yes];     [colorswatch settintcolor:color];      uint8_t tx[3] = { red * 255, green * 255, blue * 255 };     nsdata *data = [nsdata datawithbytes:(void*)&tx length:3];      [rfduino send:data]; } 

this how set rgb colour:

void rfduinoble_onreceive (char *data, int len) {     if (len >= 3) {         // rgb values.         uint8_t red = data[0];         uint8_t green = data[1];         uint8_t blue = data[2];          // set pwm each led.         analogwrite(rgb2_pin, red);         analogwrite(rgb3_pin, green);         analogwrite(rgb4_pin, blue);     } } 

this provided answer compiles on arduino, have no idea how execute functions , where?

#include <rfduinoble.h>  int state; char command; string hexstring;  // rgb pins. int redpin = 2; int grnpin = 3; int blupin = 4;  void setup () {   state = 1;    pinmode(redpin, output);   pinmode(grnpin, output);   pinmode(blupin, output);    // data want appear in advertisement   // (the devicename length plus advertisement length must <= 18 bytes.   rfduinoble.devicename = "ios";   rfduinoble.advertisementinterval = milliseconds(300);   rfduinoble.txpowerlevel = -20;   rfduinoble.advertisementdata = "rgb";    // start ble stack.   rfduinoble.begin(); }  void loop () {   //rfduino_ulpdelay(infinite); }  void processcommand (int command, string hex) {   // hex ?   // command ? }  void rfduinoble_onreceive (char *data, int len) {   (int = 0; < len; i++) {     statemachine(data[i]);   } }  void statemachine (char data) {   switch (state) {     case 1:       if (data == 1) {         state = 2;       }     break;     case 2:       if (data == 'b' || data == 'f' || data == 'c') {         command = data;         hexstring = "";         state = 3;       } else if (data != 1) { // stay in state 2 if received 0x01.         state = 1;       }     break;     case 3:       if ((data >= 'a' && data <= 'z') || (data >= '0' && data <= '9')) {         hexstring = hexstring + data;         if (hexstring.length() == 6) {           state = 4;         }       } else if (data == 1) {         state = 2;       } else {         state = 1;       }     break;     case 4:       if (data == 3) {         processcommand(command, hexstring);         state = 1;       } else if (data == 1) {         state = 2;       } else {         state = 1;       }     break;   } } 

edit: final code

#include <rfduinoble.h>  // state properties. int state = 1; char command; string hexstring;  // rgb pins. int redpin = 2; int grnpin = 3; int blupin = 4;  // setup function set rgb pins output pins. void setup () {   pinmode(redpin, output);   pinmode(grnpin, output);   pinmode(blupin, output);    // data want appear in advertisement   // (the devicename length plus advertisement length must <= 18 bytes.   rfduinoble.devicename = "ios";   rfduinoble.advertisementinterval = milliseconds(300);   rfduinoble.txpowerlevel = -20;   rfduinoble.advertisementdata = "rgb";    // start ble stack.   rfduinoble.begin(); }  void loop () {   switch (command) {     case 1:       // blink.     break;     case 2:       // fade.     break;   }    //rfduino_ulpdelay(infinite); }  // converts hex string actual hex values. // needed convert ascii value hex // value of each character. byte getval (char c) {   if (c >= '0' && c <= '9') return (byte)(c - '0');   else return (byte)(c - 'a' + 10); }  // process each function/command. void processcommand (int command, string hex) {   switch (command) {     case 'b':       command = 1; // set blink mode.     break;     case 'f':       command = 2; // set fade mode.     break;     case 'c':       // put 2 characters       // done hex notation , set color.       byte red = getval(hex.charat(1)) + (getval(hex.charat(0)) << 4);       byte green = getval(hex.charat(3)) + (getval(hex.charat(2)) << 4);       byte blue = getval(hex.charat(5)) + (getval(hex.charat(4)) << 4);        // set color.       setcolor (red, green, blue);     break;   } }  // sets color of each rgb pin. void setcolor (byte red, byte green, byte blue) {   analogwrite(redpin, red);   analogwrite(grnpin, green);   analogwrite(blupin, blue); }  // function returns data radio. void rfduinoble_onreceive (char *data, int len) {   (int = 0; < len; i++) {     statemachine(data[i]);   } }  // main state machine function, processes // data depending on bytes received. void statemachine (char data) {   switch (state) {     case 1:       if (data == 1) {         state = 2;       }     break;     case 2:       if (data == 'b' || data == 'f' || data == 'c') {         command = data;         hexstring = "";         state = 3;       } else if (data != 1) { // stay in state 2 if received 0x01.         state = 1;       }     break;     case 3:       if ((data >= 'a' && data <= 'z') || (data >= '0' && data <= '9')) {         hexstring = hexstring + data;         if (hexstring.length() == 6) {           state = 4;         }       } else if (data == 1) {         state = 2;       } else {         state = 1;       }     break;     case 4:       if (data == 3) {         processcommand(command, hexstring);         state = 1;       } else if (data == 1) {         state = 2;       } else {         state = 1;       }     break;   } } 

there code here can use convert hex characters byte.

so, can add existing code -

byte getval(char c)  {        if (c >= '0' && c <= '9')          return (byte)(c - '0');        else          return (byte)(c-'a'+10) }  void processcommand (int command, string hex) {       switch (command) {            case 'b':               command = 1;   // set blink mode                break;            case 'f':               command=2;    // set fade mode               break;            case 'c':               byte red=getval(hex.charat(1)) + (getval(hex.charat(0)) << 4);               byte green=getval(hex.charat(3)) + (getval(hex.charat(2)) << 4);               byte blue=getval(hex.charat(5)) + (getval(hex.charat(4)) << 4);               setcolor(red,green,blue);      } }  void setcolor(byte red,byte green,byte blue) {  // set pwm each led.         analogwrite(rgb2_pin, red);         analogwrite(rgb3_pin, green);         analogwrite(rgb4_pin, blue); } 

on ios side can use -

-(void) sendcommand:(char)command arg1:(byte)arg1 arg2:(byte)arg2 arg3:(byte) arg3 {      nsstring *commandstring=[nsstring stringwithformat:@"\001%c%02x%02x%02x\003",command,arg1,arg2,arg3];      nsdata *commanddata=[commandstring datausingencoding:nsasciistringencoding];      [rfduino send:data]; }  - (ibaction)fadebuttonpressed:(id)sender {     [self sendcommand:'f' arg1:0 arg2:0 arg3:0]; }  - (ibaction)blinkbuttonpressed:(id)sender {     [self sendcommand:'b' arg1:0 arg2:0 arg3:0]; }  - (void)setcolor {     nslog(@"colors: rgb %f %f %f", red, green, blue);      uicolor *color = [uicolor colorwithred:red green:green blue:blue alpha:1.0];      [colorswatch sethighlighted:yes];     [colorswatch settintcolor:color];      [self sendcommand:c arg1:red*255 arg2:green*255 arg3:blue*255]; }