[riot-notifications] [RIOT-OS/RIOT] ERROR: Timeout waiting for ACK/NACK after 'Synch (0x55 0x55)' (#11031)

Yannic notifications at github.com
Sat Apr 13 04:33:13 CEST 2019


`ttyUSB1` has always worked when the device on that port has an unlocked bootloader.

If I reset the device with JTAG every time before trying to flash a new image everything works just fine, but that can't be the intended solution.

As [the header file of the OpenMote-B](https://github.com/RIOT-OS/RIOT/blob/master/boards/openmote-b/include/board.h#L98) suggests, the bootloader backdoor should be enabled, it just doesn't seem to work for me.

````
#define CCA_BACKDOOR_ENABLE       (1)
#define CCA_BACKDOOR_PORT_A_PIN   (6) /**< BSL_BOOT Pin */
#define CCA_BACKDOOR_ACTIVE_LEVEL (0) /**< Active low */
````

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