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Initialisation error :BSC_Initialize Failed: -4

Other Parts Discussed in Thread: BOOST-CC2564MODA, CC2564

Hi,

I am using BOOST-CC2564MODA for my BT-BLE solution along with STM32L496. I somehow manged to port SPPLEDemo example in STM32 Bluetopia stack to STM32L496 MCU.

While running the example faced the following error

OpenStack().
BSC_Initialize Failed: -4.
Unable to open the stack.

My UART connection is 4 wire 

STM32L4                 BOOST-CC2564MODA

TX             ------>            RX

RX             <------            TX

RTS           ------>           CTS

CTS          <-------           RTS

Defines symbols in IAR project preprocessor options 

STM32L496xx
DEBUG_ENABLED
USE_FULL_LL_DRIVER
__SUPPORT_LOW_ENERGY__

The green LED of the BOOST-CC256MODA glows on powering which indicates a proper powerup/ Initialisation sequence I guess?

I read many posts regarding this issue but didn't quiet understand how to debug this issue?