12 KiB
Highlights of BK8000L from datasheet
arduino library:
specs:
- Bluetooth v2.1 + EDR ;
- A2DP v1.2 ;
- AVRCP v1.0 ;
- HFP v1.5 ;
- GAVDP1.2 ;
- HSP1.2 ;
- IOP
Parameters:
| Bluetooth Specification | Bluetooth V2.1 |
| Supply voltage | DC3.3-4.2V , ≤ 2.9V Automatic shutdown, ≤ 3.1V Call the police |
| Bluetooth protocol support | HFPV1.5 , A2DPV1.2 , AVRCPV1.4 , HSP1.2 , GAVDP1.2 , IOP |
| Working current | ≤ 60mA |
| Standby Current | <500uA |
| temperature range | - 40oC ~ + 85oC |
| Wireless transmission range | ≤ 10 Meters |
| transmit power | Class2 4dbm |
| Sensitivity | - 80dBm <0.1% BER |
| Frequency Range | 2.4GHz ~ 2.480GHz |
| External Interface | Serial ( TTL Level, 3.3V ) |
| Audio Performance | SBC decoding |
| Module size | 25x13.5x1.8mm |
| Size adapter plate | 21x29mm |
PINOUT
| PIN | NAME | decription | NOTES |
|---|---|---|---|
| 1 | GND | ground for antena | |
| 2 | ANT | antena, default off, internal is used | |
| 3 | GND | ground for antena | |
| 4 | VOL + (TMS) | volume up, JTAG | |
| 5 | VOL - (TCK) | volume down, JTAG | |
| 6 | NEXT (TDO) | next track, JTAG | |
| 7 | PREV (TDI) | previous track, JTAG | |
| 8 | #RST | reset, active LOW | |
| 9 | MBISTEN | unused | |
| 10 | TX(GPIO0) | 3.3V UART TX | |
| 11 | RX(GPIO1) | 3.3V UART RX | |
| 12 | PP/CALL (GPIO2) | Play / Pause / phone / releases / re-pair | |
| 13 | LED0 (GPIO3) | Status Indicator | |
| 14 | LED1 (GPIO4) | Status Indicator | |
| 15 | MUTE (GPIO5) | Mute Control (mute output low), the control terminal of the power amplifier | |
| 16 | GND | power ground | |
| 17 | AGND | AUX ground | |
| 18 | #AUX_DET (GPIO11) | AUX Insertion detection (active low) | |
| 19 | AUX_R | AUX Right channel input | |
| 20 | AUX_L | AUX Left channel input | |
| 21 | MIC_N | Microphone negative terminal | |
| 22 | MIC_P | Microphone positive terminal | |
| 23 | VMIC | Microphone bias voltage | |
| 24 | LN | Audio left differential output negative end | |
| 25 | LP | Audio left positive differential output terminal | |
| 26 | RP | Audio right differential output positive terminal | |
| 27 | RN | Audio right differential output negative end | |
| 28 | VBUS | Unused | |
| 29 | VBAT | power input( 3.3 ~ 4.2V ) | |
| 30 | 3V0 | Unused | |
| 31 | ADC | Unused | |
| 32 | GND | power ground |
AT instruction
Serial Configuration
- Baud Rate 9600 ;
- 8 Data bits;
- No parity bit;
- One stop bit;
- 9600 , N , 8 , 1 .
Format
Control Instruction format: AT + <CMD> [<param>]\r\n
Feedback data format: <IND> [<param>]\r\n
Control instructions
| Serial command | parameter | description | example | return | note |
|---|---|---|---|---|---|
| CA | pairing | AT+CA\r\n | |||
| CB | Exit pairing | AT+CB\r\n | |||
| CC | The last paired device connected | AT+CC\r\n | what this should do? connect to last connected device? | ||
| CD | disconnect | AT+CD\r\n | |||
| CE | Answer the call | AT+CD\r\n | |||
| CF | reject a call | AT+CF\r\n | |||
| CG | Hang up | AT+CG\r\n | |||
| CH | redial | AT+CH\r\n | last called number? | ||
| CK | volume up | AT+CK\r\n | |||
| CL | volume down | AT+CL\r\n | |||
| CM | Multi-language switch | AT+CM\r\n | |||
| CO | Channel switching (invalid) | AT+CO\r\n | to be tested | ||
| CP | Shutdown | AT+CP\r\n | |||
| CT | Enter the test mode | AT+CT\r\n | |||
| CW | Retention | test this | |||
| CV | Open phone VOICE | AT+CV\r\n | |||
| CY | Retention | test this | |||
| CZ | Memory clear | AT+CZ\r\n | |||
| CMM | Number:( 0-4 ) | Set the number of multi-lingual | AT+CMM4\r\n | ||
| MA | Music Play / Pause | AT+MA\r\n | |||
| MC | The music stops | AT+MC\r\n | |||
| MD | next track | AT+MD\r\n | |||
| ME | previous track | AT+ME\r\n | |||
| MF | fast forward | AT+MF\r\n | test how does this exacly works? | ||
| MH | rewind | AT+MH\r\n | test how does this exacly works? | ||
| MN | Query bluetooth name | AT+MN\r\n | NA:BK8000L\r\n | test this | |
| MO | Bluetooth connection status inquiry | AT+MO\rn | connection succeeded:" C1\r\n"no connection:"C0\r\n" | ||
| MP | PIN Code query | AT+MP\r\n | PN:0000\r\n | ||
| MR | Query bluetooth address | AT+MR\r\n | AD:111111111111\r\n | ||
| MQ | Query software version | AT+MQ\r\n | XZX-V1.2\r\n | ||
| MV | Bluetooth playback status inquiry | AT+MV\r\n | Play: "MB\r\n", time out:"MA\r\n", disconnect:" M0\r\n" | ||
| MY | Bluetooth inquiry HFP status | AT+MY\r\n | disconnect:"M0\r\n", connection:"M1\r\n", Caller: "M2\r\n", Outgoing: "M3\r\n", calling:"M4\r\n" |
from dump of lash:
| command | what google tell us about it | module response |
|---|---|---|
| AT+CKPD=200 | Notifies the AG service when a button on the headset is pressed. [1] | OK |
| AT+VGM= | AT+VGM=%gain% Notifies the audio gateway service when the microphone volume on the headset is changed to the specified gain value. [1] | |
| AT+VGS= | AT+VGS=%gain% Notifies the audio gateway service when the speaker volume on the headset is changed to the specified gain value. [1] | |
| AT+CHUP | Rejects an incoming call. [2] | OK |
| AT+CCWA= | Enables call waiting notification in the audio gateway [2]2 | OK |
| AT+BLDN | Bluetooth last dialled number [2] | |
| AT+BRSF= | Retrieves the supported features [2] | |
| AT+BTRH= | ||
| AT+BTRH? | ||
| AT+BVRA= | Enables or disables voice recognition in the audio gateway. [2] | |
| AT+CIND=? | Retrieves the indicator mappings for the audio gateway. [2] | |
| AT+CIND? | Reads the current status of the audio gateway indicators. [2] | |
| AT+CMER=3,0,0, | Registers or unregisters status updates. [2] | OK |
| AT+CHLD= | OK | |
| AT+CHLD=? | OK | |
| AT+CLCC | OK | |
| AT+CLIP= | Enables the call line identification. | OK |
| AT+COPS=3,0 | OK | |
| AT+COPS? | OK | |
| AT+CNUM | ||
| AT+VTS= | ||
| AT+XAPL=0000-0000-0100,7 | ||
| AT+IPHONEACCEV= |
[1] https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ms881905(v=msdn.10)
[2] https://docs.microsoft.com/en-us/previous-versions/windows/embedded/ms881893(v=msdn.10)
bluetooth status information send without request
| static part of data | variable part of sent data | description | real data |
|---|---|---|---|
| II | connection succeeded | II\r\n | |
| IA | disconnect | IA\r\n | |
| MA | timeout: MA\r\n(isn't this paused music?) | ||
| MB | Play: MB\r\n | ||
| IR | number | Caller ID | IR-136XXXXXX |
| PR | number | Outdoing number | PR-136XXXXX |
| ON | Bluetooth is thurned on | ON\r\n |
SPP Introduction
| SPP Data Format | parameter | description | example | info returnd by module |
|---|---|---|---|---|
| APT+SPP8888 | Four-digit password ( 8888 ) | Through a password to open SPP | APT+SPP8888\r\n | pass OK: OK\r\n, wrong pass: ERR \r\n |
| APT+XXXXXXX | data 64byte | transfer data, do not exceed recommended 64byte | APT+XXXXXX\r\n | success: OK\r\n, error: ERR\r\n |
| APR+XXXXXXX | data 64byte | receive data, do not exceed recommended 64byte | APR+XXXXXX\r\n | Data sent from phone |
NOTES:
based on datasheet (BK8000L_datasheet.pdf) BK8000L has support for SDcard:
| PIN | function |
|---|---|
| GPIO12 | sd_clk/clk13m |
| GPIO13 | sd_cmd/SCL |
| GPIO14 | sd_data[0]/SDA |
| GPIO15 | sd_data[1] |
| GPIO16 | sd_data[2] |
| GPIO17 | sd_data[3] |
wakeup:
The BK8000L can enter into shut down mode when there is no active connection. The shut mode can be waked up by GPIO and USB charge. All GPIO can be source to wake up MCU from shut down state. In shut down state, any level change on the set GPIO will trigger the wake up procedure.
KICAD supporting files:
schematics symbol:
PCB module:
RE-draw of basic supporting circutes (mic, output etc...) is in breakout board adapter project: here
strings from flash dump:
/AT+
...skipping
AT+CKPD=200
AT+VGM=
AT+VGS=
sec_ssp_keypress_notify %02x:%02x:%02x:%02x:%02x:%02x %02x
sec_ssp_passkey_notify %02x:%02x:%02x:%02x:%02x:%02x %06lu
sec_ssp_passkey_req %02x:%02x:%02x:%02x:%02x:%02x
remote_name_complete %02x:%02x:%02x:%02x:%02x:%02x %02x %s
Command in progress was aborted by the target device
sec_ssp_conf_req %02x:%02x:%02x:%02x:%02x:%02x %06lu
EVENT_PLAYBACK_STATUS_CHANGED
UNKNOWN EVENT
EVENT_TRACK_CHANGED
EVENT_TRACK_REACHED_END
EVENT_TRACK_REACHED_START
EVENT_PLAYBACK_POS_CHANGED
EVENT_BATT_STATUS_CHANGED
EVENT_SYSTEM_STATUS_CHANGED
EVENT_PLAYER_APPLICATION_SETTING_CHANGED
EVENT_NOW_PLAYING_CONTENT_CHANGED
EVENT_AVAILABLE_PLAYERS_CHANGED
EVENT_ADDRESSED_PLAYER_CHANGED
EVENT_UIDS_CHANGED
EVENT_VOLUME_CHANGED
avrcp getcaps eventids: count %d
id=%d (%s)
STOPPED
UNKNOWN
PLAYING
PAUSED
FWD_SEEK
REV_SEEK
id=%d (%s)
, playback status=%s
, current track index=0x%08lx:%08lx
avrcp play status:
song length %ld sec
song position %ld sec
play status %s
avrcp %s: %lu
Beken
FFTTEST
AECTEST
AECIOCTL
acl_req %02x:%02x:%02x:%02x:%02x:%02x %02x%02x%02x
hs disconnected %lu
INVALID RESULT_T VALUE
sco failed to open %s
hs connected %lu
release failed
press failed
TITLE
ARTIST
ALBUM
TOTAL_TRACK_NUMBER
GENRE
PLAYING_TIME
[cont']
attr_id %s, char_set_id %d, attr_len 0x%x attr_val%s: %.*s
%u %02x:%02x:%02x:%02x:%02x:%02x %u
...skipping
AT+CHUP
AT+CCWA=
AT+BLDN
AT+BRSF=
AT+BTRH=
AT+BTRH?
AT+BVRA=
AT+CIND=?
AT+CIND?
AT+CMER=3,0,0,
AT+CHLD=
AT+CHLD=?
AT+CLCC
AT+CLIP=
AT+COPS=3,0
AT+COPS?
AT+CNUM
AT+VTS=
AT+XAPL=0000-0000-0100,7
AT+IPHONEACCEV=
call on hold
held call rejected
held call accepted
AG Response and Hold status - %s
AG indicator %s=%d
AG current calls %d, %d, %d, %d, %d, %s, %d, %s, %d
PR-%s
IR-%s
AG calling line identification %s, %d, %s, %d, %s, %d
AG operator %s
AG state {service %d, call %d, callsetup %d, callheld %d, signal %d, roam %d}
AG subscriber %s, type %d
AG waiting call notification %s, %d, %d, %s, %d, %s, %d, %d
disable_complete %lu %02x
a2dp connected %lu
hf connected %lu
stream suspended %lu
stream started %lu
enable_complete %lu %02x
OPERATION NOT STARTED
OPERATION IN PROGRESS
OPERATION NOT PERMITTED
NO SUCH ENTRY
INPUT/OUTPUT ERROR
DEVICE NOT CONFIGURED
FAILED ALLOCATING MEMORY
RESOURCE IS BUSY
NO SUCH DEVICE
INVALID ARGUMENT
OPERATION NOT SUPPORTED
OPERATION TIMED OUT
DEVICE IS SUSPENDED
GENERAL-PURPOSE ERROR
LOGICAL TEST FAILURE
INCORRECT STATE
PIPE IS STALLED
INVALID PARAMETER
OPERATION ABORTED
SHORT TRANSFER
WOULD BLOCK
ALREADY
EVALUATION TIME EXPIRED
RESOURCE IS FULL
DEST ADDR REQUIRED
CAN'T ASSIGN REQUESTED ADDRESS
MESSAGE TOO LONG
NET DOWN
NET UNREACHABLE
NET RESET
CONNECTION ABORTED
CONNECTION RESET
ALREADY CONNECTED
NOT CONNECTED
CONNECTION REFUSED
HOST DOWN
HOST UNREACHABLE
NO LINK
PROTOCOL
NO PROTOCOL OPTION
OPERATION INTERRUPTED
PROTOCOL TYPE MISMATCH
newconn, svc id
connecting, svc id
%u %02x:%02x:%02x:%02x:%02x:%02x
a2dp connecting %lu
hs connecting %lu
SBC [%02x %02x]
bitpool %d/%d
16KHz %s, 32KHz %s, 44KHz %s, 48KHz %s
MONO %s, DUAL %s, STEREO %s, JOINT STEREO %s
block 4 %s, 8 %s, 12 %s, 16 %s
subbands 4 %s, 8 %s
SNR %s, Loudness %s
MPEG-1,2 AUDIO [%02x %02x %02x %02x]
I %s, II %s, III %s, CRC %s
16K %s, 22K %s, 24K %s, 32K %s, 44K %s, 48K %s
MPF %s, VBR %s
bit rate 0x%x, 0x%x
MPEG-2,4 AAC [%02x %02x %02x %02x %02x %02x]
MPEG2 LC %s, MPEG4 LC %s, LTP %s, SCALABLE %s
8K %s, 11K %s, 12K %s, 16K %s, 22K %s, 24K %s, 32K %s, 44K %s
48K %s, 64K %s, 88K %s, 96K %s
MONO %s, STEREO %s, VBR %s, bit rate %ld
ATRAC [%02x %02x %02x %02x %02x %02x %02x]
0123456789ABCDEF
0123456789abcdef
Infinity
POSIX
powf
sqrtf
ASCII
ASCII
Public Browse Group Root
Bluetooth service discovery
0000
Audio Sink
Audio/Video remote Control
BK8000L
0000