Is there any jpeg capture (like snapshot) example with JX37 camera?

FreeRTOS SDK
1

thansk for support in advanced, I saw couple examples for medial control in SDK,
but seem most sample are processing video streaming, is there snapshot example ?
I would like to capture one frame every 20ms and store a jpeg format.

thank you in advanced.

I checked Arduino(camera to lcd) and rtos SDK and I put same setting in both project.

Arduino Project is working well, but tried to implement same with rtos SDK and got fail.

the camera ctx in rtos is below (should be same as Arduino one)

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image1335×727 64.1 KB

with above, I did implement snapshot callback and send snapshot command during while loop.

seems snapshot is not triggered with rtos sdk.

I found out the debug messages are different

rtos sdk:

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image799×680 34.7 KB

arduino debug:

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image1226×849 259 KB

I saw FW version are different and the heap size of VOE is big different also (11722496 and 7528192).

appreciated for your help and let me know if you need mroe information.

2

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3

Hi @sl526,

Have you tried this example?

You may need to uncomment line 37,
#define ENABLE_SD_SNAPSHOT //Enable the snapshot to sd card

4

thank you Pammy,

I think it should be still working w/o enabling SD storage and below is the debug message.

there is a thread to send CMD_VIDEO_SNAPSHOT every 10 sec and expect to see snapshot result

“printf(“snapshot size=%d\n\r”, jpeg_len);” → but I did not see this and it reset in 30 sec.

== Rtl8735b IoT Platform ==

[Normal mode]
BootFromNORFlash
[Start Boot ROM...]
=== Load PARTBL ===
=== Load Done ===
=== Load ISP_IQ ===
[fcs chk pass]
ISP_IQ @ 0x8461080, 0x58f80, 0x0
mfcs_data version 0x00010001
fcs_data version 0x00010101
=== Process ISP_IQ ===
=== Load Done ===
=== Load BL ===
[Image Start Table @ 0x18200]
=== Load Done ===

== Boot Loader ==
Nov  4 2025:14:24:05
=== Load FCS Para ===
=== Load Done ===
[crc pass]
=== Load ISP_IQ Sensor ===
ISP_IQ @ 0x8461080, 0x58f80
=== Process ISP_IQ ===
=== Load Done ===
=== Load FW1 ===
FW_ISP_IQ @ 0x8061080, 0x5af80
=== Process FW_ISP_IQ ===
DRAM_TYPE is DDR2 128MB.
ddr_freq = 533
VOE flash @ 0x80bc080, 0x82f80
FCS KM_status 0x00002081 err 0x0000200a
Wait KM fcs done 0 us
FCS TM_status 0x003f0000
store fcs data for application
It don't do the sensor i                            nitial process
RAM TM_STATUS 0x00bf1208 err 0x00001208
read fcs_status 0x000000bf
read fcs_stat                            us 0x000000bf
=== Process VOE IMG ===
[Image Start Table @ 0x20106200]
RAM Load @ 0x813f100->0x20106200, 0x6ac0
DDR Load @ 0x8146080->0x70100000, 0x1fc89e
=== FW Load Done ===

Boot Loader <==

== RAM Start ==
Build @ 23:24:32, Sep  7 2026

$8735b>interface 0 is initialized
interface 1 is initialized
cfg_size_lib = 124, cfg_size_user = 124

Initializing WIFI ...[Driver]: [HALMAC]
11692M HALMAC_MAJOR_VER = 1
HALMAC_PROTOTYPE_VER = 4
HALMAC_MINOR_VER = 20
HALMAC_PATCH_VER =
[Driver]: The driver include MP
[Driver]: Ver = libwlan:2026.07.27.15.54_b9.6_3985028b6cc47b5593d8544193444f6921                            2fa7e2
RFE type = 0
start_addr=(0x4000), end_addr=(0x8000), buffer_size=(0x4000), smp_number_max=(20                            48)

WIFI initialized
[Driver]: PSCAN_FAST_SURVEY channel: 1

[Driver]: set ssid [justin1219]
[Driver]: rtw_joinbss_cmd MGMT_FRAME_PROTECTION_OPTIONAL no pmf.
[Driver]: Bcn (ie: 266, rsn: 0, wpa: 0) ch: 1, seq: 3868, ts: 3016677069041

[Driver]: start auth to 4c:22:f3:86:01:07

[Driver]: auth success, start assoc
[Driver]: listen_interval: 10, bcn_interval: 100

[Driver]: association success(res=2)

[Driver]: set pairwise key to hw: alg:4(WEP40-1 WEP104-5 TKIP-2 AES-4)

[Driver]: set group key to hw: alg:4(WEP40-1 WEP104-5 TKIP-2 AES-4) keyid:2
(0) Scan: 1, Auth: 1, Assoc: 1, 4way: 1, connect: 1, reason: 0

Interface 0 IP address : 192.168.1.108
[LwIP_DHCP] dhcp offered_t0_lease: 259200
init_thread(59), Available heap 0x69167a0
[video_voe_presetting] fps:30  w:1920  h:1080

voe heap size = 23314944
fwin(1),enc_en(0),IQ_OFFSET = 0x2b620
fwin(1),enc_en(0),SENSOR_OFFSET = 0x3b580
sensor id 2 iq_data 2b620 sensor_data 3b580

RTSP[0] port: 554
hal_voe_ready 0x0 0xbf1208
connect successful sta mode

read fcs_status 0x000000bf
[video_init] uvcd iq is null, use default.
[video_init] uvcd SNR is null, use default.
IQ:FW size (65376)
sensor:date 2026/6/29 version:RTL8735B_VOE_1.7.1.0
sensor:FW size (3848)
sensor timestamp: 2026/06/29
iq timestamp: 2024/03/21 11:26:35
voe_heap malloc 0x706fc120, size 23314944
ISP:1 ENC:1 H265:1 NN:1
hal_voe_ready 0x0 0xbf1208
voe   :RTL8735B_VOE_1.7.1.0
sensor:RTL8735B_VOE_1.7.1.0
hal   :RTL8735B_VOE_1.7.1.0
load time sensor:48us iq:815us itcm:0us dtcm:0us ddr:0us ddr2:0us
Set H264 default HIGH profile
rc_version RC_v1
[video_pre_init_procedure] START
hal_voe_send2voe too long 150797 cmd 0x00000206 p1 0x00000000 p2 0x00000000
VOE command 0x206 fail ret 0x0
[Driver]: TSFValue = 3016678093051, tsf = 0, shift_set= 0x8000, bcn int = 100

[APP] send snapshot cmd now
[APP] send snapshot cmd now

below is the uncommend function

image
image1012×624 39.6 KB