Forum >How do i know my Bluno is connected?

How do i know my Bluno is connected?

djh_83 2015-03-22 05:37:54 21247 Views14 Replies
Hi,

I connect to the bluno with my iphone app over blue tooth. When I connect, a little led turns on, on the board and I can now send and receive bytes over Bluetooth. I'd like to know from within the bluno program that I am now connected with a device. The reason being is to only start sending serial data after a successful connection with the smart phone.

Thanks

2025-03-05 15:02:59

How do you do that? I'm a complete beginner and I've been looking for a solution like this for months (viewtopic.php?f=8&t=1350 ) and this seems like it could be it!

What's the IIC interface and how do you read pin8 from CC2540?

Thanks in advance!

tiojoca

2025-03-05 15:02:36

您是如何做到的？我完全是个初学者，几个月来我一直在寻找这样的解决方案（viewtopic.php?f=8&t=1350），这似乎就是解决方案！@@什么是 IIC 接口，您如何从 CC2540 读取 pin8？@@提前致谢！

tiojoca

2025-03-05 15:02:05

嗨，timjanwall，@@抱歉，我之前没有检查过 CC2540 的 IIC 接口。刚才，我查看了它的数据表，似乎 CC2540 仅支持 SPI 接口，而不支持 IIC。http ://www.ti.com/lit/ds/symlink/cc2540.pdf

Leff

2021-03-02 08:40:12 So, just in case someone else runs into this issue. It appears that pins 6 and 7 on the MCU are attached to the Link and Pair LEDs from the BLE module. This means you can test the state of pin 6 to tell whether you are linked or not. deanarnold.uk

2021-02-23 06:07:42 Just checking to see if anyone has found a better method. I have found the sketch above does not work great if you are going in and out of sleep mode. deanarnold.uk

2016-07-15 04:08:45 I think Leff ment i2c and i looking for the same solution as tiojoca, i will try dig in to how to get to the CC2540 with i2c. If you find enything usefull post here or pm

timjanwall

2016-07-15 04:08:45 I think Leff ment i2c and i looking for the same solution as tiojoca, i will try dig in to how to get to the CC2540 with i2c. If you find enything usefull post here or pm

timjanwall

2015-06-24 00:58:24 brilliant！ Leff

2015-05-01 03:38:40 I ended up solving this using a totally different approach. I set the board to AT mode and use the AT+RSSI=? command to get the RSSI which will always be -000 if Bluno is not connected to a BT device. An example implementation of this solution:

Code: Select all

const int ledBLE = 13;
typedef enum {START, WAIT_AT, WAIT_RSSI, WAIT_EXIT, NORM_MODE, _TMP} state_type;
state_type state = START;
char chr;
String buffer, rssi, data;
bool reading = false;

void setup() {
   Serial.begin(115200);      //Initiate the Serial comm
   pinMode(ledBLE, OUTPUT);
   state = START;
 }

void loop() {
   if (state == START) {
      start();
   } else if (state == WAIT_AT) {
      wait_at();
   } else if (state == WAIT_RSSI) {
      wait_rssi();
   } else if (state == WAIT_EXIT) {
      wait_exit();
   } else if (state == NORM_MODE) {
      norm_mode();
   }
}

void start() {
   delay(10);
   Serial.print("+");
   Serial.print("+");
   Serial.print("+");
   data = "";
   state = WAIT_AT;
}

void wait_at() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == 'E') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      } else {
         data += chr;
      }
      if (reading && buffer == "Enter AT Mode\r\n") {
         Serial.println("AT+RSSI=?");
         reading = false;
         state = WAIT_RSSI;
      } else if (data == "led_on") {
         digitalWrite(ledBLE, HIGH);
         data = "";
      } else if (data == "led_off") {
         digitalWrite(ledBLE, LOW);
         data = "";
      }
   }
}

void wait_rssi() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == '-') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      }
      if (buffer.length() == 4) {
         rssi = buffer;
         Serial.println("AT+EXIT");
         reading = false;
         state = WAIT_EXIT;
         if (rssi == "-000") {
            digitalWrite(ledBLE, LOW);
         }
      }
   }
}

void wait_exit() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == 'O') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      }
      if (buffer == "OK\r\n") {
         reading = false;
         state = NORM_MODE;
      }
   }
}

void norm_mode() {
   Serial.println("\r\n<<<");
   Serial.println(rssi);
   Serial.println(">>>\r\n");
   Serial.flush();
   state = START;
}

Not sure this is the best way to do it, though. I'm not very comfortable with using Serial for all the different inputs/outputs of different sources: executing AT commands and getting their results, getting data from BT, and outputting data back to USB.

Does anyone have a better suggestion on how to do this? tiojoca

Code: Select all

const int ledBLE = 13;
typedef enum {START, WAIT_AT, WAIT_RSSI, WAIT_EXIT, NORM_MODE, _TMP} state_type;
state_type state = START;
char chr;
String buffer, rssi, data;
bool reading = false;

void setup() {
   Serial.begin(115200);      //Initiate the Serial comm
   pinMode(ledBLE, OUTPUT);
   state = START;
 }

void loop() {
   if (state == START) {
      start();
   } else if (state == WAIT_AT) {
      wait_at();
   } else if (state == WAIT_RSSI) {
      wait_rssi();
   } else if (state == WAIT_EXIT) {
      wait_exit();
   } else if (state == NORM_MODE) {
      norm_mode();
   }
}

void start() {
   delay(10);
   Serial.print("+");
   Serial.print("+");
   Serial.print("+");
   data = "";
   state = WAIT_AT;
}

void wait_at() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == 'E') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      } else {
         data += chr;
      }
      if (reading && buffer == "Enter AT Mode\r\n") {
         Serial.println("AT+RSSI=?");
         reading = false;
         state = WAIT_RSSI;
      } else if (data == "led_on") {
         digitalWrite(ledBLE, HIGH);
         data = "";
      } else if (data == "led_off") {
         digitalWrite(ledBLE, LOW);
         data = "";
      }
   }
}

void wait_rssi() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == '-') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      }
      if (buffer.length() == 4) {
         rssi = buffer;
         Serial.println("AT+EXIT");
         reading = false;
         state = WAIT_EXIT;
         if (rssi == "-000") {
            digitalWrite(ledBLE, LOW);
         }
      }
   }
}

void wait_exit() {
   while (Serial.available() > 0) {
      chr = Serial.read();
      if (chr == 'O') {
         reading = true;
         buffer = "";
      }
      if (reading) {
         buffer += chr;
      }
      if (buffer == "OK\r\n") {
         reading = false;
         state = NORM_MODE;
      }
   }
}

void norm_mode() {
   Serial.println("\r\n<<<");
   Serial.println(rssi);
   Serial.println(">>>\r\n");
   Serial.flush();
   state = START;
}

2015-03-22 05:37:54 Hi,

I connect to the bluno with my iphone app over blue tooth. When I connect, a little led turns on, on the board and I can now send and receive bytes over Bluetooth. I'd like to know from within the bluno program that I am now connected with a device. The reason being is to only start sending serial data after a successful connection with the smart phone.

Thanks djh_83

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