Hi, everyone:
I purchase no long time ago the BK3266 module from Bekken (https://es.aliexpress.com/item/1005004506411041.html?spm=a2g0o.order_list.order_list_main.17.6572194dAwoBOA&gatewayAdapt=glo2esp), which is supossed to be the replace for the BK8000L.
However, I'm struggling to power on this device. I connect 3,3V to VBAT and GND pins and I'm using a USB-TTL device to connect to UART RX and TX pins of the board, but I can not detect this bluetooh device through my phone or PC, neither the UART connectivity works. I had the same behaviour ocurred with 3 different BK3266 modules, all of them soldered to its expansion boards.
I have not found the datasheet for the board, but I found the datasheet for the SoC (http://www.c-chip.com.cn/english/userfile/productPic/20181201113141.pdf). There, I read that after a reset, the SoC goes into a standby mode where, according to the datasheet:
[...]
Standby – In this mode all circuits are powered down except the GPIO interface and a timer active to allow external circuitry and internal timer to wake-up the device. This is the default low power state of the chip while it is waiting to be used. There is no interaction with any Bluetooth devices in this state.
[...]
But I cannot found the way to wake up the board itself since I do not know if these GPIO pins from the SoC are straightly connected to the pins of the board (the pins of my multimeter are not small enough to thest each pin from the SoC correctly)
Has anyone managed to use this module correctly? Has anyone had the same problem as me or is it possible that these boardscame in bad condition?
Thank you very much!