thank you for a prompt reply and for cheering me up)
indeed, using Transparent Mode on the end device throws the TX payload out of the UART, all fine.
However I still have no success in achieving any kind of effect on the Grove.
Here is what I did:
- receiving XBee (Transparent Mode) is getting 3.3V on pin 1 (XBee dev board) along with the Grove.
- dev board pin 2 connected to RX on Grove
- dev board pin 3 connected to TX on Grove
- dev board pin 10 is sharing GND with Grove's GND and GND of my power supply
- XBee (0 13 A2 0 40 DA 78 AF) is getting the API frame (ID 1B) as follows:
7e 0 13 0 1B 0 13 A2 0 40 DA 78 AF 1 7E FF 6 0C 0 0 0 EF 6F
According to the KT403 documentation here http://www.seeedstudio.com/wiki/images/c/c0/Grove_-_MP3_v2.0_KT403A_datasheet_V1.3_EN%28Recompiled_by_Seeed%29.pdf this payload should reset the chip, and this frame, for example:
7e 00 13 00 E1 00 13 A2 00 40 DA 78 AF 01 7E FF 06 0F 01 01 01 EF A3 should start the playback of an 01/01.mp3 on card.
Unfortunately, the status LED on Grove is blinking neither shortly while resetting nor constantly while playing (as stated here: http://www.seeedstudio.com/wiki/Grove_-_MP3_v2.0#Hardware_Overview). Nothing is to hear as well. LED is on constantly.
Maybe you have an idea what I'am doing wrong here?
Maybe there is a possibility for me to debug by listening to the Grove's UART somehow?
And yes, I am sure the link between XBees is working, since my Remote AT like
7e 0 10 17 1E 0 13 A2 0 40 DA 78 AF FF FE 2 44 34 5 58 /
7e 0 10 17 1F 0 13 A2 0 40 DA 78 AF FF FE 2 44 34 4 58 are resulting in turning the DS4 led on board on and off.
Thank you in advance for looking into this!
ps: Also the selecting "SD as playing device" and "setting volume to 1E" commands were performed without effect.