Sending date through Bluetooth using the EZ430-RF2560

The appl_send_spp_data() function in the appl_sdk.c reads the accelerometer data and sends it  via bluetooth. Also please note that the accelerometer sends a small amount of data. So to change the size of the data being sent change the PAYLOAD_SIZE and the checksum index. I am struggling with the frequency which it needs to send the data. If you can figure out where I can send the data at a faster rate it would be cool.

Please see below.

My appl_send_spp_data() function looks as follows:

void appl_send_spp_data(UCHAR dev_index)
{
    sdk_spp_data_read(appl_spp_data_buffer, sizeof(appl_spp_data_buffer)
       );

I don't understand how this code reads the data from the accelerometer and sends it.

sdk_spp_data_read reads the data from the accelerometer. The function to is present in sdk_pl.c . The accelerometer data is being read using I2C. The data to be sent via bluetooth is being done by appl_spp_write(...) in file appl_spp.c which essentially does the same thing above. You can try by writing some fixed pattern in the appl_spp_data_buffer array to see if the data is being sent fine and commenting out sdk_spp_data_read(...).

Are you using any external sensor? Is the UART communication being done between the sensor and MSP430?

Yes Gautam, the UART communication is being done between an external sensor and the MSP430.

You can use the same code, but I am not sure about the interrupts. You can poll the data out from your sensor and then send it. As far as I understand the appl_send_spp_data(..) is scheduled to run every few milliseconds. I am still trying to find how to increase or decrease the frequency though. If you still want to enable interrupts just set up a buffer and then simply send the data from the buffer in the appl_send_spp_data(..).

Gautam, I think you need to increase the throughput in your case. Look on page 172 of the developers guide. It might help you.

I'm going to start modifying the  appl_send_spp_data and see if I can make it work.

Simple.

void appl_send_spp_data(UCHAR dev_index)
{
    /* sdk_spp_data_read(appl_spp_data_buffer, sizeof(appl_spp_data_buffer) );*/

   appl_spp_data_buffer[0]  = 'T';

   appl_spp_data_buffer[1] = 'E';

   appl_spp_data_buffer[2] = 'S';

   appl_spp_data_buffer[3] = 'T';

    appl_spp_write(dev_index, appl_spp_data_buffer, sizeof(appl_spp_data_buffer)
        );
}

You should be able to see "TEST" in your hyper-terminal.

Thanks for the info. Could you expand a little on your second point regarding the timer? Is there some sample code I can look at that uses the timer to read the sensor data? I'm confused on how to do this.

Also, you said to comment out the out appl_send_spp_data function call, but isn't this what I will be using to send the data through bluetooth?

I am trying to read data from PIN 39 on the back of the EZ430.

Thank you.

Hi Srisenthilkumar,

hope I could pronouce your name right:). I have read several of your post and I think you are really an expert in EZ430-rf2560. I am trying to detect a ADC signal and send that to my laptop computer. I have successfully modified the (ez430-rf2560 version of) accl code and i could let my end device sending ADC data to my PC thru the dongle (another ez430-rf2560 and the USB stick). now I wanna connect this thing directly to my PC bluetooth. I failed several times that I found a connection has been built and a COM port has been assigned to my end device on my PC, but I just cannot open them thru hyperterminal. 

I realized that your post might have answered that question. from the developer's guide page 153, it said step 16 is to appl_send_spp_data(dev_index) and step 17/18 is to check a CNF signal from the peer device before sending another step 16. I think without a USB peer rf2560, I cannot give my end device a CNF so the connection is malfunctioning, hence I cannot open my COM thru hyperterminal?

2 questions:

1. if my understanding is correctly. otherwise why I can built connection bwtween PC-->USB-MSP430-rf2560--> MSP430rf2560 while not able to directly connect PC to end device? (I modified the requirement for MSP430-Demo prefix)

2. you gave a tip that commenting out all appl_send_spp_data, and use the timer A ISR to send data. I tried that, but under #pragma vector=TIMER1_A0_VECTOR __interrupt void TIMER1_A0_ISR(void) function at user.task.c, appl_send_spp_data (rem_bt_dev_index) is warne since rem_bt_dev_index is used before its value is set from spp connection function or somewhere. what could I do?

desperately need my ez430-rf2560 talking to my PC without any dongle thing.......

Thanks in advance!

Jingle