CCS/MSP-EXP430F5529LP: GUI Composer v2 not working

Does no one have any possible solutions?

Hello Martin

Thanks for your response, and those links. I have decided it may be best for me to go the USB/Serial IO route, using JSON.

I am starting with the BlinkJsonUart tutorial project, and have verified that it works. The code made available from this project is:

#include <aJSON.h>

// most launchpads have a red LED
#define LED RED_LED

//see pins_energia.h for more LED definitions
void printled_statewithjson(int state){
  aJsonObject* root = aJson.createObject();
  if (root == NULL) {
    return;
  }

  aJson.addItemToObject(root, "LED", aJson.createItem(state));

  char* string = aJson.print(root);
  
  if (string != NULL) {
    Serial.println(string);
    free(string);
  } 
  
  aJson.deleteItem(root);
}
  
// the setup routine runs once when you press reset:
void setup() {                
  // initialize the digital pin as an output.
  pinMode(LED, OUTPUT);     
  Serial.begin(9600); 
}

// the loop routine runs over and over again forever:
void loop() {
  digitalWrite(LED, HIGH);   // turn the LED on (HIGH is the voltage level)
  printled_statewithjson(1); // print json object with LED status set to 1 to UART
  delay(1000);               // wait for a second
  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW
  printled_statewithjson(0); // print json object with LED status set to 0 to UART
  delay(1000);               // wait for a second
}

Of the 3 functions, I understand what the loop() and setup() functions do. But I do not fully understand how printled_statewithjson() [line 19] works. Based on the information sent through the COM Port, I can tell that line 25 contains the information to be sent. Though I'm unsure of what exactly the "root" variable does, "LED" here must be referring to the name of the widget in the GUI, and "aJson.createItem(state)" must be telling the GUI whether the LED is on or off (1 or 0). Is this correct?

Finally, to implement similar code in my program, I am thinking that the necessary steps are to include the "aJSON.h" and "energia.h" headers, then use a function similar to printled_statewithjson().

Regards

Hi Raheem,

 printled_statewithjson function is using aJson energia library. If you read documentation for it, it should become clearer how that function works. here is a link to github that has that library and some documentation for it. 

Using that library is probably useful when you need to send complex JSON objects. However, if you just want to send few simple variables then it might be simpler to just print to serial. below is a simple example that pretty much does the same thing. i.e. it sends 

{"led":"0"}

or 

{"led":"1"} 

strings over serial port depending on whether blink example turns LED on or off. 

_____________________________

// most launchpads have a red LED

#define LED RED_LED

volatile unsigned int blinkCounter;

 

//see pins_energia.h for more LED definitions

//#define LED GREEN_LED

 

// the setup routine runs once when you press reset:

void setup() {               

  // initialize the digital pin as an output.

  pinMode(LED, OUTPUT);    

    //Initialize serial and wait for port to open:

  Serial.begin(9600);

}

 

// the loop routine runs over and over again forever:

void loop() {

  digitalWrite(LED, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);               // wait for a second

  Serial.println("{\"led\":1\}");

  blinkCounter++;

  digitalWrite(LED, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);               // wait for a second

  Serial.println("{\"led\":0\}");

  blinkCounter++;

}

Okay then, thanks.

The Serial.print() method is easier, but does CCS v7come with the library installed to use it? How about CCS Cloud?

From the reseach I did, it seems that the library comes with Energia, which I am not using. I tried including the "aJSON.h" and "energia.h" libraries in CCS v7, but errors are always occuring, stating that more header files/libraries need to be included.

Regards

Martin,

I went ahead and tried to print to serial using different functions I found in use in the program. This is my snippet of code:

if (g%2 == 0){
       strcpy(OutputString,"{\"LED\":0\}");
       #ifdef UART_COMM
       // Send the message to the host over UART
             putsUART((BYTE*)OutputString,strlen(OutputString));
       #endif
   }
   else{
       strcpy(OutputString,"{\"LED\":1\}");
       #ifdef UART_COMM
       // Send the message to the host over UART
             putsUART((BYTE*)OutputString,strlen(OutputString));
       #endif
   }
   g++;

The code should be alternately sending {"led":"0"} or {"led":"1"}. I confirmed that this works, using PuTTY:

But when I try connecting to the device via GUI Composer v2, the service either does not connect, or does not receive the data. This is what I am seeing:

And that red bar at the bottom continues on forever; no data ever shows in the console.

Do you know how to fix this?

Regards

Hello Martin

That was my mistake. I have adjusted the code so that the output is {"LED":"0"}, and GUI Composer v2 recognizes the data now. Thanks for the help.

Regards