Smart Bluetooth Forum Discussions

Can I use HCI UART(PIN#18 and #19 of BCM20732S module) from the application?

I'm making small pcb and need to shrink # of pins.

So if I can use HCI UART as Peripheral UART, it greatly helps me.

* Which eval boards are supported on each SDK? I haven't found a clear list anywhere.

* Is a better eval board available for the BCM20732 than the BCM920732TAG_Q32? This board has the pins broken out to tiny 20 mil diameter pads. I soldered to them with kynar wire, but even attaching small logic analyzer clips has already damaged the board. It's not really very usable.

I saw some documents in docsafe for a BCM920732EVAL_Q32_P3 board that actually uses 100 mil headers. Is this board available?

Hello,

lets say I have a characteristic:

    CHARACTERISTIC_UUID128 (0x0029, HANDLE_HELLO_SENSOR_VALUE_NOTIFY, UUID_HELLO_CHARACTERISTIC_NOTIFY,
                           LEGATTDB_CHAR_PROP_READ | LEGATTDB_CHAR_PROP_NOTIFY | LEGATTDB_CHAR_PROP_INDICATE,
                           LEGATTDB_PERM_READABLE, 7),
        'H','e','l','l','o',' ','0',

now I want to change the message and its length and then send it:

void update_message( UINT8 *data, INT32 len)
{
  int i;
  BLEPROFILE_DB_PDU db_pdu;

  bleprofile_ReadHandle(HANDLE_HELLO_SENSOR_VALUE_NOTIFY, &db_pdu);

  for( i = 0; i<len; i++)
  {
       db_pdu.pdu = data;
  }
  db_pdu.len = len;

  bleprofile_WriteHandle(HANDLE_HELLO_SENSOR_VALUE_NOTIFY, &db_pdu);
  ble_trace1("len1: %d\n", db_pdu.len); 


  bleprofile_ReadHandle(HANDLE_HELLO_SENSOR_VALUE_NOTIFY, &db_pdu);
  ble_trace1("len2: %d\n", db_pdu.len);

}

the problem I am having with my above function is that the data gets modified correctly, but the length remains the same.

lets say I pass the new length to be 3.

At line 15 the output I get is 3.

but at line 18, after reading the handle back the output goes back to 7.

Then when I send my data over BLE, I send 3 bytes of my new data plus the original remaining bytes.

Is there a way to have the length of the data payload change? How can i do this?

Thank you

Can I get a copy of the BCM20732 datasheet that is not watermarked? The one from docsafe is very difficult to read, requires an annoying password every time I open the document, and will not allow me to copy/paste. I would be hesitant to design in Broadcom parts if the documentation is so unpleasant to read. Other vendors do not do this. (example: http://www.ti.com/lit/ds/symlink/cc2540.pdf)

* What is the maximum SPI frequency for SPIFFY2? The documentation is conflicting.

20732-DS107-R pg 35 specifies:

"12 MHz when:              VDDIO >= 2.2v

  6 MHz when:    2.2V > VDDIO >= 1.62v"

920732HW-AN100-R pg 7 specifies:

"The maximum SCLK speed supported by SPIFFY2 is 6 MHz at all IO supply voltages."

* Are the maximum frequencies different for master and slave mode?

* Is there a minimum SPI frequency?

* For a given SPI transmission size, will the device consume more energy with a high clock rate (6 MHz), or a low clock rate (100 KHz)

Is there such thing as a reference design for the BCM20732S?

I'm trying to work out what's needed to get the chip up and running and programme it, but I realise that I'm going on a combination of the BCM20732S datasheet, and the schematics for the sensor TAG, which use the BCM20730/BCM20732, so maybe I'm missing something that's required for the module to function.