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TechNexion VoiceHat information page
TechNexion VoiceHat includes four parts:
TFA9892 (speaker), SPH0645(MIC), PCA9955(LEDs), 8 GPIO keys.
TechNexion VoiceHat is used in Amazon Alexa project with TechNexion PICO-IMX7D/PICO-IMX8MQ.
NXP added a Yocto meta-layer("meta-avs-demos") to integrate Amazon Alexa SDK.
| SOM | BaseBoard | Software |
|---|---|---|
| PICO-IMX7D | PICO-PI | After Yocto 2.5(included) |
| PICO-IMX8MQ | PICO-PI-8M | After Yocto 2.5(included) |
| PICO-IMX8MM | PICO-PI-8M | After Yocto 2.5(included) |
| FLEX-IMX8MM | FLEX-PI | After Yocto 2.5(included) |
PS. "meta-avs-demos" isn't integrated in TechNexion Yocto
Configure it to use the power supply of VoiceHat from external independent power(J5, 12V) or baseboard.
With Jumper on Pin1 Pin2andPin9 Pin10: VoiceHat uses the power from baseboard.
Without jumpers on Pin1 Pin2andPin9 Pin10: VoiceHat uses the power from external independent power(J5, 12V).
(For PICO-IMX7D with PICO-PI, we suggest using external 12V power from J5.)
Control the routing patch of the signal.
For PICO-IMX7D : Set D1, D3, D5, D7 as UP(ON).
For PICO-IMX8MM/8MQ : Set D2, D4, D6, D8 as UP(ON).
For PICO-PI rev.B1:
=> setenv setfdt 'setenv fdtfile imx7d-pico-pi-voicehat.dtb'
For PICO-PI rev.C2:
=> setenv setfdt 'setenv fdtfile imx7d-pico-pi-c2-voicehat.dtb'
Please refer to:
# dmesg
Ensure that loaded DTB is correct.
OF: fdt: Machine model: TechNexion PICO-IMX7D and PI baseboard with VoiceHat
Ensure that SPH0645(MIC) driver is initialized correctly.
imx_sph0645_probe(): imx_sph0645_probe
imx_sph0645_probe(): Found 1 codec(s)
imx_sph0645_probe(): Reference clock found: pll_audio_main @ 663552000
imx_sph0645_init():
imx-sph0645 sound-sph0645: imx_sph0645_init,177: dai_init
imx-sph0645 sound-sph0645: sph0645 <-> 308c0000.sai mapping ok
imx_sph0645_probe(): done
Ensure that TFA9892(speaker) driver is initialized correctly.
snd_soc_tfa98xx: loading out-of-tree module taints kernel.
tfa98xx_i2c_init(): TFA98XX driver version v6.5.5
tfa98xx_i2c_probe(): addr=0x34
tfa98xx_i2c_probe(): TFA9912 detected
tfa98xx_i2c_probe(): tfa98xx_i2c_probe Probe completed successfully!
tfa98xx_i2c_probe(): addr=0x35
Found 2 codec(s)
Ensure the TFA98xx module driver are loaded successfully.
# lsmod
Module Size Used by
snd_soc_tfa98xx 147456 2
The used count should be 2.
used count 2 corresponds to left and right TFA98xx.
If TFA98xx off-tree module driver fails to be loaded.
Please check if the firmware exists and is put in the correct path.
(Yocto 2.5 already integrates TFA98xx firmware in the target image.)
The firmware should be under the path:
# ls -al /lib/firmware/tfa98/9912/TFA9892N1A_stereo_32FS.cnt
-r--r--r-- 1 root root 29090 Aug 20 2019 /lib/firmware/tfa98/9912/TFA9892N1A_stereo_32FS.cnt
Ensure there are two sound cards in the system: SPH0645(MIC) and TFA9912(speaker).
# cat /proc/asound/cards
0 [SPH0645 ]: SPH0645 - SPH0645
SPH0645
1 [TFA9912 ]: TFA9912 - TFA9912
TFA9912
Check if the ALSA PLAYBACK(TFA9912) and CAPTURE(SPH0645) devices exist.
# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: TFA9912 [TFA9912], device 0: HiFi multicodec-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
# arecord -l
**** List of CAPTURE Hardware Devices ****
card 0: SPH0645 [SPH0645], device 0: HiFi sph0645-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: TFA9912 [TFA9912], device 0: HiFi multicodec-0 []
Subdevices: 1/1
Subdevice #0: subdevice #0
To make it easier for the user, we prepare the test scripts to test functions on VoiceHat.
# /opt/voicehat-test/voicehat_main.sh
***********************************
LED Testing
***********************************
***********************************
Speaker Testing
***********************************
speaker-test 1.1.5
Playback device is hw:1
Stream parameters are 48000Hz, S16_LE, 2 channels
WAV file(s)
Rate set to 48000Hz (requested 48000Hz)
Buffer size range from 64 to 16384
Period size range from 32 to 8192
Using max buffer size 16384
Periods = 4
was set period_size = 4096
was set buffer_size = 16384
0 - Front Left
1 - Front Right
Time per period = 2.736881
0 - Front Left
1 - Front Right
Time per period = 2.986900
***********************************
MIC Testing
***********************************
Record for 5 sec, observe the volume bar, then playback:
imx_sph0645_startup():
Recording WAVE '/tmp/test.wav' : Signed 32 bit Little Endian, Ratimx_sph0645_trigger():
e 48000 Hz, Stereo
Plug PCM: Hardware PCM card 0 'SPH0645' device 0 subdevice 0
Its setup is:
stream : CAPTURE
access : RW_INTERLEAVED
format : S32_LE
subformat : STD
channels : 2
rate : 48000
exact rate : 48000 (48000/1)
msbits : 32
buffer_size : 8192
period_size : 2048
period_time : 42666
tstamp_mode : NONE
tstamp_type : MONOTONIC
period_step : 1
avail_min : 2048
period_event : 0
start_threshold : 1
stop_threshold : 8192
silence_threshold: 0
silence_size : 0
boundary : 1073741824
appl_ptr : 0
hw_ptr : 0
######+ imx_sph0645_trigger():
| 11%
imx_sph0645_shutdown():
Playing WAVE '/tmp/test.wav' : Signed 32 bit Little Endian, Rate 48000 Hz, Stereo
***********************************
Button Testing
***********************************
Please PREV button
PREV pressed
Please PLAY button
PLAY pressed
Please NEXT button
NEXT pressed
Please UP button
UP pressed
Please DOWN button
DOWN pressed
Please MUTE button
MUTE pressed
Please PAIR button
PAIR pressed
Please ACT button
ACT pressed
Most cases for unexpected reset of the board are caused by insufficient power.
Please follow the guide to use external independent power supply for VoiceHat.
Case 1. Check if the loaded DTB is the correct one with enabled VoiceHat.
Case 2. Check J6 jumper to see if you configure J6 jumper header to use external independent power but the power cable isn't plugged to J5.