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CC256XQFNEM: we are using CC256x bluetooth module and connected to stm32f411 discovery board with CC256x-STADAPT, We have few doubts

Sreenath P
Prodigy 20 points

Part Number: CC256XQFNEM

Tool/software:

1.We want to connect Phone to the Bluetooth device as BT headset (with mic). we were trying to use a3dp sample code on stm32f411 discovery board, but currently we are unable to have the playback on the speakers , from the I2s/PCM lines from CC256x .When we checked the clock and ws,data signal the voltage level is only 1.8 v (as per schematics it is supposed to be 3.3v) , the DAC on the STM32f411 discovery board needs 3.3v of signals. 
2.We also want to send sensor data back to the phone . how can we make it happen with the a3dp sample code? 
3.Also there will be a second headset connecting to the 1st one (left or right channel) (will there be any overload ?)

is a3dp better than a2dp for this application?

  • 0
    TI__Genius 14601 points

    Hi,

    1. On the cc256XQFNEM. The debug header is 1.8V however RF1 and RF2 will be at 3.3V.

    2. You can add an spp (Serial Port Profile) connection as well to send the sensor data (there is also an LE example). All you would need to do is merge the 2 examples.

    3. I dont suspect that there will be too much overload if connecting to just one more device.

    4. A3DP would lighten the load on the host, but would not allow you to do any ble concurrently on the CC256X device.

    Best,

    Rogelio

  • 0 in reply to RogelioD
    Prodigy 20 points

    2. as per this suggestion sppLE  connection back to phone and audio playback(A2dp) is happening same time .
    3.  As 2nd speaker is going to be connected to the 1st one over BT ,,  i want to transmit audio for the 2nd speaker from 1st one .. any suggestions to do this Hope I am doing it right.