Program does not stay after reset

Anonymous · ‎Jan 24, 2014

On a custom board we are using for development with a BCM20732S module, I am finding that if I press the reset button (same pin as the SoC board) or turn off power and turn back on the program does not keep. We did not have this problem with the TAG board.

Does anyone know the cause of this issue? Thanks.

MichaelF_56 · ‎Jan 27, 2014

Another thing you will want to check is the state of the HCI UART Rx line during reset.

By default, there is a 10k pull down on Rx that's internal to the module which should keep the line from going into programming mode. However, if you are using somehting like an FTDI USB to Serial converter between your PC and the board, it's possible that the FTDI device could be pulling the Rx line of the HCI UART high and preventing the device from going into application mode.

When sampled on RESET only:

HCI UART Rx = High (Programming mode)

HCI UART Rx = Low (Application mode)

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Program does not stay after reset