Hello,

You can refer to the content in the following manual as well as the MIC reference circuit.

Document download： MIC reference circuit：

Thanks, I tried the command from the document:
rk_mpi_ao_test -i audi.pcm --sound_card_name=hw:0,0 --device_ch=2 --device_rate=16000 --input_rate=16000 --input_ch=2

Here is the output I get:
# rk_mpi_ao_test -i audi.pcm --sound_card_name=hw:0,0 --device_ch=2 --device_rate=16000 --input_rate=16000 --input_ch=2
cmd parse result:
input file name : audi.pcm
output file name : (null)
loop count : 1
channel number : 1
open sound rate : 16000
open sound channel : 2
input stream rate : 16000
input channel : 2
bit_width : 16
period_count : 4
period_size : 1024
sound card name : hw:0,0
device id : 0
set volume : 100
set mute : 0
set track_mode : 0
get volume : 0
get mute : 0
get track_mode : 0
query stat : 0
pause and resume chn : 0
save file : 0
query save file stat : 0
clear buf : 0
get attribute : 0
clear attribute : 0
set loopback mode : 0
adec input file name : (null)
rockit log path (null), log_size = 0, can use export rt_log_path=, export rt_log_size= change
log_file = (nil)
RTVersion 00:18:28-995 {dump :064} ---------------------------------------------------------
RTVersion 00:18:28-995 {dump :065} rockit version: git-8cb4d25b8 Tue Feb 28 11:12:39 2023 +0800
RTVersion 00:18:28-996 {dump :066} rockit building: built- 2023-02-28 15:23:19
RTVersion 00:18:28-996 {dump :067} ---------------------------------------------------------
(null) 00:18:28-996 {log_level_init :203}

please use echo name=level > /tmp/rt_log_level set log level
name: all cmpi mb sys vdec venc rgn vpss vgs tde avs wbc vo vi ai ao aenc adec
log_level: 0 1 2 3 4 5 6

rockit default level 4, can use export rt_log_level=x, x=0,1,2,3,4,5,6 change
(null) 00:18:28-996 {read_log_level :093} text is all=4
(null) 00:18:28-997 {read_log_level :095} module is all, log_level is 4
(null) 00:18:29-001 {monitor_log_level :144} #Start monitor_log_level thread, arg:(nil)
cmpi 00:18:29-009 {main :750} start running loop count = 0
RKAoChn 00:18:29-010 {setVqeAttr :784} pstVqeConfig = (nil), set mVqeEnable = false
cmpi 00:18:29-018 {commandThread :315} test info : mute = 0, volume = 100
cmpi 00:18:29-020 {sendDataThread :248} params->s32ChnIndex : 0

I don't hear any sound comming from the speaker connected to lineout and ground with a series 100ohm resistor, also there is nothing on the scope. Am I missing something? Also is there a library in the SDK which would allow me to play audio using python?

Ok, I managed to play a .wav file using alsaaudio and python. The strange thing is that I get audio output on TP4, but according to schematic for Luckfox pico plus, it's a CODEC_MICBIAS port. Is the schematic on the luckfox website not up-to-date? If so, can you share an updated version.

The TP4 is indeed an audio output interface for LINEOUT.

saSHA256 wrote: ↑2024-01-24 19:35 Ok, I managed to play a .wav file using alsaaudio and python. The strange thing is that I get audio output on TP4, but according to schematic for Luckfox pico plus, it's a CODEC_MICBIAS port. Is the schematic on the luckfox website not up-to-date? If so, can you share an updated version.

Hi, can you share how you got audio out with alsaaudio and python? Which distribution/modules, do you have some pointers/code? Thx.