5. Buildroot Application
5.1 Serial Terminal
Connect the board and PC with USB Serial cable, then power on, the terminal will output boot information. The default baudrate is 1500000.
Serial Terminal
5.2 Display
EM3576 supports MIPI LCD, HDMI and Type-C(DP Alt Mode) display synchronization.
The RGB signal is multiplexed with several interfaces. If RGB is required, please modify the hardware and kernel.
Display synchronization
5.3 USB Type-C
Features supported by the Type-C interface:
Reversible Design: Allows insertion in either orientation for user convenience.
Data Transmission Roles: Supports flexible designation of host and device roles.
Multiple Protocol Support: Compatible with USB 3.0 and DisplayPort, enabling high-speed data transmission.
5.3.1 ADB
❶ Connect the board and PC host with Type-C cable.
❷ Install ADB driver on Windows system.
❸ Press Windows + R to open the Run program. Type cmd and press Enter
❹ Execute the follow commands to enable ADB.
1adb shell
5.3.2 Type-C to USB
EM3576 supports Type-C to USB. After inserting the USB flash drive, the system will automatically mount the device.
Check information about mounted device:
1df -h
root@rk3576-buildroot:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 14G 689M 13G 6% /
devtmpfs 966M 8.0K 966M 1% /dev
tmpfs 978M 140K 978M 1% /tmp
tmpfs 978M 488K 977M 1% /run
tmpfs 978M 196K 978M 1% /var/log
tmpfs 978M 0 978M 0% /dev/shm
/dev/mmcblk2p7 123M 12M 110M 10% /oem
/dev/mmcblk2p8 15G 332K 15G 1% /userdata
/dev/sda1 31G 28G 2.2G 93% /mnt/udisk
5.3.3 DP Alt Mode
DisplayPort Alternate Mode (DP Alt Mode) is a technology that facilitates the transmission of DisplayPort video signals through a USB Type-C interface. It enables devices to output video and audio via a USB-C connection without requiring a dedicated DisplayPort connector. This allows users to connect a display using a single USB-C port while transmitting video, audio, and additional data.
Boardcon has conducted the testing at Type-C to HDMI/DP (3840 x 2160 @ 60fps).
Type-C to HDMI
5.4 USB Host
After inserting the USB flash drive, the system will automatically mount the device.
Check information about mounted device:
1df -h
root@rk3576-buildroot:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 14G 689M 13G 6% /
devtmpfs 966M 8.0K 966M 1% /dev
tmpfs 978M 140K 978M 1% /tmp
tmpfs 978M 504K 977M 1% /run
tmpfs 978M 204K 978M 1% /var/log
tmpfs 978M 0 978M 0% /dev/shm
/dev/mmcblk2p7 123M 12M 110M 10% /oem
/dev/mmcblk2p8 15G 332K 15G 1% /userdata
/dev/sda1 58G 47G 12G 81% /mnt/udisk
/dev/sdb1 31G 28G 2.2G 93% /media/udisk1
5.5 Ethernet
❶ Connect the Board and router with an Ethernet cable.
❷ View the status of the Network interface.
1ifconfig
root@rk3576-buildroot:/# ifconfig
eth0 Link encap:Ethernet HWaddr B2:EF:E7:4F:BF:85
inet addr:192.168.0.216 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::a645:3196:e4ea:385/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:59 errors:0 dropped:4 overruns:0 frame:0
TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13635 (13.3 KiB) TX bytes:1340 (1.3 KiB)
Interrupt:64
❸ Ping URL to test Network.
1ping -I eth0 www.armdesigner.com
root@rk3576-buildroot:/# ping -I eth0 www.armdesigner.com
PING www.armdesigner.com (67.222.54.196) from 192.168.0.216 eth0: 56(84) bytes of data.
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=1 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=2 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=3 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=4 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=5 ttl=48 time=190 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=6 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=7 ttl=48 time=191 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=8 ttl=48 time=190 ms
^C
--- www.armdesigner.com ping statistics ---
8 packets transmitted, 8 received, 0% packet loss, time 7010ms
rtt min/avg/max/mdev = 190.493/190.668/191.365/0.274 ms
5.6 SATA
Important
SATA cannot be used with USB2.0 Host simultaneously. Boardcon Android firmware default SATA is unavailable. To enable SATA, please reflash the image boot_sata.img
❶ Connect SATA and SATA power(5V).
❷ Power on.
❸ Format SATA to ext4. If the device is in ext4 format, skip this step.
1mke2fs -t ext4 /dev/sda
Warning
This operation will permanently erase all existing data on the selected partition. Before running the command below, double‑check that the device path is correct.
❹ The system will automatically mount the device. Check information about mounted device:
1df -h
root@rk3576-buildroot:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 14G 689M 13G 6% /
devtmpfs 966M 8.0K 966M 1% /dev
tmpfs 978M 140K 978M 1% /tmp
tmpfs 978M 468K 977M 1% /run
tmpfs 978M 184K 978M 1% /var/log
tmpfs 978M 0 978M 0% /dev/shm
/dev/mmcblk2p7 123M 12M 108M 10% /oem
/dev/mmcblk2p8 15G 364K 15G 1% /userdata
/dev/nvme0n1 229G 7.8G 209G 4% /mnt/storage
/dev/sda 110G 7.8G 97G 8% /media/storage1
/dev/mmcblk1p1 30G 608K 30G 1% /mnt/sdcard
5.7 SD Card
EM3576 supports SD Hot-plug.
After inserting the Micro SD card, the system will automatically mount the device.
Check information about mounted device:
1df -h
root@rk3576-buildroot:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 14G 689M 13G 6% /
devtmpfs 966M 8.0K 966M 1% /dev
tmpfs 978M 140K 978M 1% /tmp
tmpfs 978M 512K 977M 1% /run
tmpfs 978M 208K 978M 1% /var/log
tmpfs 978M 0 978M 0% /dev/shm
/dev/mmcblk2p7 123M 12M 110M 10% /oem
/dev/mmcblk2p8 15G 332K 15G 1% /userdata
/dev/sda1 58G 47G 12G 81% /mnt/udisk
/dev/sdb1 31G 28G 2.2G 93% /media/udisk1
/dev/mmcblk1p1 30G 608K 30G 1% /mnt/sdcard
5.8 M.2 SSD
EM3576 only supports SSD in ext4 format.
❶ Connect SSD to the M.2 socket.
❷ Power on.
❸ Format SSD to ext4. If the device is in ext4 format, skip this step.
1mke2fs -t ext4 /dev/nvme0n1
❹ The system will automatically mount the device. Check information about mounted device:
1df -h
root@rk3576-buildroot:/# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/root 14G 689M 13G 6% /
devtmpfs 966M 8.0K 966M 1% /dev
tmpfs 978M 140K 978M 1% /tmp
tmpfs 978M 520K 977M 1% /run
tmpfs 978M 192K 978M 1% /var/log
tmpfs 978M 0 978M 0% /dev/shm
/dev/mmcblk2p7 123M 12M 108M 10% /oem
/dev/mmcblk2p8 15G 348K 15G 1% /userdata
/dev/nvme0n1 229G 7.8G 209G 4% /mnt/storage
/dev/mmcblk0p1 30G 608K 30G 1% /mnt/sdcard
/dev/sda1 58G 47G 12G 81% /mnt/udisk
/dev/sdb1 31G 28G 2.2G 93% /media/udisk1
5.9 WiFi & Bluetooth
5.9.1 WiFi
❶ Connect the WiFi antenna.
❷ View the device information.
1ifconfig
root@rk3576-buildroot:/# ifconfig
p2p0 Link encap:Ethernet HWaddr 3A:7A:CC:2A:11:87
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr 38:7A:CC:2A:11:87
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
❸ Scan for available WiFi hotspots.
1iwlist wlan0 scan
root@rk3576-buildroot:/# iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: E2:5D:54:8E:58:86
ESSID:"EZVIZ_BE4401587"
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.437 GHz (Channel 6)
Encryption key:on
Bit Rates:300 Mb/s
Extra:wpa_ie=dd160050f20101000050f20401000050f20401000050f202
IE: WPA Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Extra:
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK
Quality=100/100 Signal level=12/100
Extra:fm=0002
Cell 02 - Address: BC:1A:E4:EF:A0:D4
ESSID:"SZGX"
Protocol:IEEE 802.11bgn
Mode:Master
Frequency:2.412 GHz (Channel 1)
Encryption key:on
Bit Rates:780 Mb/s
Extra:rsn_ie=30140100000fac040100000fac040100000fac020c00
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : CCMP
Pairwise Ciphers (1) : CCMP
Authentication Suites (1) : PSK Extra:fm=0003
Cell 02 - Address: D8:32:14:25:B7:A2
ESSID:"LYB-5G"
Protocol:IEEE 802.11AC
Mode:Master
Frequency:5.805 GHz
Encryption key:on
Bit Rates:867 Mb/s
❹ Connect to the hotspot.
1wifi-connect.sh SSID PSK //input your SSID and password
❺ Test the WiFi network.
1ifconfig
2ping -I wlan0 www.armdesigner.com
root@rk3576-buildroot:/# ifconfig
p2p0 Link encap:Ethernet HWaddr 3A:7A:CC:2A:11:87
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
wlan0 Link encap:Ethernet HWaddr 38:7A:CC:2A:11:87
inet addr:192.168.0.217 Bcast:192.168.0.255 Mask:255.255.255.0
inet6 addr: fe80::5468:66de:9c2a:5b0e/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:60 errors:0 dropped:2 overruns:0 frame:0
TX packets:32 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:8817 (8.6 KiB) TX bytes:3872 (3.7 KiB)
root@rk3576-buildroot:/# ping -I wlan0 www.armdesigner.com
PING www.armdesigner.com (67.222.54.196) from 192.168.0.217 wlan0: 56(84) bytes of data.
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=1 ttl=48 time=193 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=2 ttl=48 time=196 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=3 ttl=48 time=195 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=4 ttl=48 time=194 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=5 ttl=48 time=251 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=6 ttl=48 time=200 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=7 ttl=48 time=195 ms
64 bytes from 67-222-54-196.unifiedlayer.com (67.222.54.196): icmp_seq=8 ttl=48 time=201 ms
^C
--- www.armdesigner.com ping statistics ---
9 packets transmitted, 8 received, 11.1111% packet loss, time 8011ms
rtt min/avg/max/mdev = 193.266/203.254/250.975/18.241 ms
5.9.2 Bluetooth
❶ View the Bluetooth device status.
1hciconfig -a
root@rk3576-buildroot:/# hciconfig -a
hci0: Type: Primary Bus: UART
BD Address: 38:7A:CC:2A:11:88 ACL MTU: 1021:5 SCO MTU: 255:11
UP RUNNING
RX bytes:2127 acl:0 sco:0 events:60 errors:0
TX bytes:4418 acl:0 sco:0 commands:77 errors:0
Features: 0xff 0xff 0xff 0xfa 0xdb 0xbf 0x7b 0x87
Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
Link policy: RSWITCH HOLD SNIFF PARK
Link mode: PERIPHERAL ACCEPT
Name: 'BlueZ 5.77'
Class: 0x6c0414
Service Classes: Rendering, Capturing, Audio, Telephony
Device Class: Audio/Video, Loudspeaker
[ 185.882030] rtk_btcoex: BTCOEX hci_rev 0x05a8
[ 185.882081] rtk_btcoex: BTCOEX lmp_subver 0xcbcd
HCI Version: 5.1 (0xa) Revision: 0x5a8
LMP Version: 5.1 (0xa) Subversion: 0xcbcd
Manufacturer: Realtek Semiconductor Corporation (93)
❷ Make Bluetooth discoverable and allow it to be pairable.
1hciconfig hci0 piscan
2bluetoothctl
root@rk3576-buildroot:/# hciconfig hci0 piscan
root@rk3576-buildroot:/# bluetoothctl
hci0 new_settings: powered connectable discoverable bondable ssp br/edr le secure-conn
Agent registered
[CHG] Controller 38:7A:CC:2A:11:88 Pairable: yes
[bluetooth]#
❸ Scanning for nearby Bluetooth devices.
1scan on //enable scanning
2scan off //disable scanning
3devices //list devices
Run scan on to start searching for devices.
After scanning, run scan off to stop the search and prevent continuous refreshing.
Run devices to view the list of detected devices.
[bluetooth]# scan on
SetDiscoveryFilter success
hci0 type 7 discovering on
Discovery started
[CHG] Controller 38:7A:CC:2A:11:88 Discovering: yes
[NEW] Device 88:68:4B:74:39:44 OPPO K10 5G
[NEW] Device 4B:73:65:34:5F:5D 4B-73-65-34-5F-5D
[NEW] Device D4:6C:27:DF:40:46 D4-6C-27-DF-40-46
[NEW] Device 10:0E:A1:1C:13:A8 10-0E-A1-1C-13-A8
[CHG] Device A8:35:12:9A:EB:4D RSSI: 0xffffffe1 (-31)
[NEW] Device 7D:B8:B6:62:89:47 7D-B8-B6-62-89-47
[NEW] Device 2C:A0:42:D1:14:D5 Kang
[NEW] Device 5D:9A:E9:D5:D8:9B 5D-9A-E9-D5-D8-9B
[NEW] Device 14:DE:39:72:B3:C3 Mate 40 Pro
[NEW] Device 43:C7:3D:C0:16:E4 43-C7-3D-C0-16-E4
[CHG] Device 14:DE:39:72:B3:C3 RSSI: 0xffffffb3 (-77)
[NEW] Device 7B:7E:22:4C:1B:08 7B-7E-22-4C-1B-08
[bluetooth]# scan off
hci0 type 7 discovering off
Discovery stopped
[CHG] Device 7B:7E:22:4C:1B:08 TxPower is nil
[CHG] Device 7B:7E:22:4C:1B:08 RSSI is nil
[CHG] Device 43:C7:3D:C0:16:E4 RSSI is nil
[CHG] Device 14:DE:39:72:B3:C3 RSSI is nil
[CHG] Device 5D:9A:E9:D5:D8:9B TxPower is nil
[CHG] Device 5D:9A:E9:D5:D8:9B RSSI is nil
[CHG] Device 2C:A0:42:D1:14:D5 RSSI is nil
[CHG] Device 7D:B8:B6:62:89:47 TxPower is nil
[CHG] Device 7D:B8:B6:62:89:47 RSSI is nil
[CHG] Device A8:35:12:9A:EB:4D RSSI is nil
[CHG] Device 10:0E:A1:1C:13:A8 RSSI is nil
[CHG] Device D4:6C:27:DF:40:46 RSSI is nil
[CHG] Device 4B:73:65:34:5F:5D TxPower is nil
[CHG] Device 4B:73:65:34:5F:5D RSSI is nil
[CHG] Device 88:68:4B:74:39:44 RSSI is nil
[CHG] Controller 38:7A:CC:2A:11:88 Discovering: no
[bluetooth]# devices
Device A8:35:12:9A:EB:4D liuy
Device 88:68:4B:74:39:44 OPPO K10 5G
Device 4B:73:65:34:5F:5D 4B-73-65-34-5F-5D
Device D4:6C:27:DF:40:46 D4-6C-27-DF-40-46
Device 10:0E:A1:1C:13:A8 10-0E-A1-1C-13-A8
Device 7D:B8:B6:62:89:47 7D-B8-B6-62-89-47
Device 2C:A0:42:D1:14:D5 Kang
Device 5D:9A:E9:D5:D8:9B 5D-9A-E9-D5-D8-9B
Device 14:DE:39:72:B3:C3 Mate 40 Pro
Device 43:C7:3D:C0:16:E4 43-C7-3D-C0-16-E4
Device 7B:7E:22:4C:1B:08 7B-7E-22-4C-1B-08
[bluetooth]#
❹ Pair the device A8:35:12:9A:EB:4D for example.
1pair A8:35:12:9A:EB:4D
[bluetooth]# pair A8:35:12:9A:EB:4D
Attempting to pair with A8:35:12:9A:EB:4D
hci0 device_flags_changed: A8:35:12:9A:EB:4D (BR/EDR)
supp: 0x00000000 curr: 0x00000000
[bluetooth]# [ 173.017134] rtk_btcoex: hci create connection, start paging
[ 174.380179] rtk_btcoex: connected, handle 0001, status 0x00
[ 174.380268] rtk_btcoex: Page success
hci0 A8:35:12:9A:EB:4D type BR/EDR connected eir_len 11
[CHG] Device A8:35:12:9A:EB:4D Connected: yes
[liuy]# [ 174.460956] rtk_btcoex: io capability request
Request confirmation
[agent] Confirm passkey 622774 (yes/no): yes
[liuy]# [ 178.036444] rtk_btcoex: link key notify
hci0 new_link_key A8:35:12:9A:EB:4D type 0x05 pin_len 0 store_hint 1
[CHG] Device A8:35:12:9A:EB:4D Bonded: yes
[liuy]# [ 178.187364] rtk_btcoex: l2cap op 2, len 16, out 0
[CHG] Device A8:35:12:9A:EB:4D UUIDs: 8ce255c0-200a-11e0-ac64-0800200c9a66
[CHG] Device A8:35:12:9A:EB:4D UUIDs: 9664aa26-d76c-43ad-9775-d310f253a408
[CHG] Device A8:35:12:9A:EB:4D ServicesResolved: yes
[CHG] Device A8:35:12:9A:EB:4D Paired: yes
Pairing successful
[DEL] Device 4C:3E:56:53:EC:2D 4C-3E-56-53-EC-2D
[liuy]# [ 181.164278] rtk_btcoex: l2cap op 6, len 16, out 1
[ 181.164408] rtk_btcoex: TX l2cap disconn req, hndl 0x0001, dcid 0x0059, scid 0x0040
[DEL] Device 2C:A0:42:D1:14:D5 Kang
[ 181.164442] rtk_btcoex: handle_l2cap_discon_req: handle 0x0001, dcid 0x0059, scid 0x0040, dir 1
[DEL] Device 78:AE:22:6E:47:2C 78-AE-22-6E-47-2C
[DEL] Device CC:64:1A:B6:C3:AE ubuntu
[liuy]# connect [ 185.247311] rtk_btcoex: disconn cmpl evt: status 00, handle 0001, reason 13
hci0 A8:35:12:9A:EB:4D type BR/EDR disconnected with reason 3
[ 185.247391] rtk_btcoex: process disconn complete event.
[CHG] Device A8:35:12:9A:EB:4D ServicesResolved: no
[CHG] Device A8:35:12:9A:EB:4D Connected: no
❺ Connect the device.
1connect A8:35:12:9A:EB:4D
[bluetooth]# connect A8:35:12:9A:EB:4D
Attempting to connect to A8:35:12:9A:EB:4D
[bluetooth]# [ 189.910955] rtk_btcoex: hci create connection, start paging
[ 190.709669] rtk_btcoex: connected, handle 0002, status 0x00
[ 190.709733] rtk_btcoex: Page success
hci0 A8:35:12:9A:EB:4D type BR/EDR connected eir_len 11
[CHG] Device A8:35:12:9A:EB:4D Connected: yes
[liuy]# [ 190.914878] rtk_btcoex: l2cap op 2, len 16, out 1
5.10 Audio I/O
5.10.1 Audio in
5.10.1.1 Line in
❶ Plug the Microphone into the 3.5mm Audio jack(Line in).
❷ Switch to the Line in channel.
1amixer -c0 cset name='Right PGA Mux' 1
2amixer -c0 cset name='Left PGA Mux' 1
root@rk3576-buildroot:/# amixer -c0 cset name='Right PGA Mux' 1
numid=69,iface=MIXER,name='Right PGA Mux'
; type=ENUMERATED,access=rw------,values=1,items=3
; Item #0 'Line 1R'
; Item #1 'Line 2R'
; Item #2 'DifferentialR'
: values=1
root@rk3576-buildroot:/# amixer -c0 cset name='Left PGA Mux' 1
numid=68,iface=MIXER,name='Left PGA Mux'
; type=ENUMERATED,access=rw------,values=1,items=3
; Item #0 'Line 1L'
; Item #1 'Line 2L'
; Item #2 'DifferentialL'
: values=1
❸ Start recording.
1arecord -D hw:0,0 -f cd -r 44100 -c 2 -t wav test.wav
Press Ctrl + C to exit recording.
5.10.1.2 MIC
❶ Connect a MIC to the connector (2pin/2.0mm pitch).
❷ Switch to the microphone(MIC) channel.
1amixer -c0 cset name='Right PGA Mux' 2
2amixer -c0 cset name='Left PGA Mux' 2
root@rk3576-buildroot:/# amixer -c0 cset name='Right PGA Mux' 2
numid=69,iface=MIXER,name='Right PGA Mux'
; type=ENUMERATED,access=rw------,values=1,items=3
; Item #0 'Line 1R'
; Item #1 'Line 2R'
; Item #2 'DifferentialR'
: values=2
root@rk3576-buildroot:/# amixer -c0 cset name='Left PGA Mux' 2
numid=68,iface=MIXER,name='Left PGA Mux'
; type=ENUMERATED,access=rw------,values=1,items=3
; Item #0 'Line 1L'
; Item #1 'Line 2L'
; Item #2 'DifferentialL'
: values=2
❸ Start recording.
1arecord -D hw:0,0 -f cd -r 44100 -c 2 -t wav test.wav
Press Ctrl + C to exit recording.
5.10.2 Audio out
❶ View sound card.
1cat /proc/asound/cards
root@rk3576-buildroot:/# cat /proc/asound/cards
0 [rockchipes8388 ]: rockchip-es8388 - rockchip-es8388
rockchip-es8388
1 [rockchipdp0 ]: rockchip-dp0 - rockchip-dp0
rockchip-dp0
2 [rockchiphdmi ]: rockchip-hdmi - rockchip-hdmi
rockchip-hdmi
0- Line out1- Type-C(DP AIT mode)2- HDMI
❷ Select Audio output device to play test.wav
1amixer -c0 cset name='Speaker Switch' 1
2amixer -c0 cset name='Output 2 Playback Volume' 10 //（0-33）
3amixer -c0 cset name='PCM Volume' 140 //（0-192）
4aplay -Dhw:0,0 test.wav
1aplay -Dhw:1,0 record.wav
1aplay -Dhw:2,0 record.wav
5.11 RTC
❶ Insert a CR1220 battery before test. It keeps the time running when the main power is off.
❷ Set date and time manually.
1date -s "2024-12-20 11:23:00" //set system date
2hwclock -w //set the hardware clock to current system time
3hwclock //display date and time
root@rk3576-buildroot:/# date -s "2024-12-20 11:23:00"
Fri Dec 20 11:23:00 UTC 2024
root@rk3576-buildroot:/# hwclock -w
root@rk3576-buildroot:/# hwclock
Fri Dec 20 11:23:06 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 11:23:17 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 11:23:55 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 11:24:01 2024 0.000000 seconds
❸ Power off. Wait a while, then reapply power. If the RTC is functioning correctly, the clock should maintain its time and keep running while the board is powered off.
root@rk3576-buildroot:/# hwclock
Fri Dec 20 14:09:13 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 14:10:32 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 14:10:53 2024 0.000000 seconds
root@rk3576-buildroot:/# hwclock
Fri Dec 20 14:11:06 2024 0.000000 seconds
5.12 RS485
❶ Connect PC and board with USB-to-RS485 adapter.
RS485 connection
❷ Open the Serial Terminal and set baud rate for EM3576 and RS485 adapter respectively.
Baud rate: EM3576 - 1500000; RS485 adapter - 115200
❸ Execute command in the terminal of the board.
1com /dev/ttyS5 115200 8 0 1
❹ Input character to test RS485 communication.
5.13 CAN
❶ Connect PC and board with USB-to-CAN adapter.
CAN connection
❷ Open the CAN application and set the baudrate to 500000 on PC.
❸ Execute commands on Serial Terminal to configure CAN.
1ip link set can0 down
2ip link set can0 type can bitrate 500000 dbitrate 2000000 fd on
3ip link set can0 up
❹ Configure CAN as receiver.
1candump can0
❺ Configure CAN as Transmitter.
1cansend can0 123#DEADBEEFDEADBEEF
5.14 UART
The UART loopback test is for reference only.
❶ Connect RX and TX of UART.
❷ Execute command and input character to test.
1com /dev/ttyS10 115200 8 0 1 //test UART10
root@rk3576-buildroot:/# com /dev/ttyS10 115200 8 0 1
port = /dev/ttyS10
baudrate = 115200
cs = 8
parity = 0
stopb = 1
hhhhhh
RECV: hhhhhh
uiuiui12121
RECV: uiuiui12121
uiuiui000
RECV: uiuiui000
❸ Press Ctrl + C to exit UART10 testing.
❹ Execute command to test UART11.
1com /dev/ttyS11 115200 8 0 1
5.15 SPI
❶ Connect SPI3_MISO and SPI3_MOSI of SPI.
❷ Execute command to SPI.
1spidev_test
root@rk3576-buildroot:/# spidev_test
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
FF FF FF FF FF FF
40 00 00 00 00 95
FF FF FF FF FF FF
FF FF FF FF FF FF
FF FF FF FF FF FF
DE AD BE EF BA AD
F0 0D
5.16 Camera
❶ Connect AHD camera to the development board.
❷ Preview.
1./rockchip-test/camera/camera_ahd_test.sh
To preview any specific camera, just modify the device ID.
1gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw, format=NV12, width=1920, height=1080, framerate=25/1 ! waylandsink &
1gst-launch-1.0 v4l2src device=/dev/video2 ! video/x-raw, format=NV12, width=1920, height=1080, framerate=25/1 ! waylandsink &
5.17 Video Playback
5.17.1 Built-in playback
The script instruction directory is in /rockchip-test/video/, just run it.
root@rk3576-buildroot:/# ls /rockchip-test/video/
test_gst_multivideo.sh test_gst_video_fps.sh video_stresstest.sh
test_gst_video.sh test_gst_video_maxfps.sh video_test.sh
root@rk3576-buildroot:/# ./rockchip-test/video/test_gst_video.sh
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Redistribute latency...
mpp[1463]: mpp_info: mpp version: unknown mpp version for missing VCS info
mpp[1463]: mpp_info: mpp version: unknown mpp version for missing VCS info
mpp[1463]: mpp_info: mpp version: unknown mpp version for missing VCS info
mpp[1463]: mpp: unable to create enc vp8 for soc rk3576 unsupported
mpp[1463]: mpp_info: mpp version: unknown mpp version for missing VCS info
mpp[1463]: mpp_info: mpp version: unknown mpp version for missing VCS info
Redistribute latency...
mpp[1463]: h264d_api: is_avcC=1
Pipeline is PREROLLED ...
Prerolled, waiting for async message to finish...
Setting pipeline to PLAYING ...
Redistribute latency...
New clock: GstSystemClock
0:00:03.0 / 0:00:29.5 (10.4 %)
5.17.2 Browser playback
1chromium /mnt/udisk/video/4KP60/4KP60-exist.mp4
Command explanation:
chromiumLaunches the Chromium browser./mnt/udisk/video/4KP60/4KP60-exist.mp4The media file path to be played.
5.17.3 Command line
1gst-play-1.0 --videosink="waylandsink fullscreen=true" /mnt/udisk/video/8KP30/H265_8KP30-2.mp4 --audiosink="alsasink device=hw:0,0"
Command explanation:
/mnt/udisk/video/8KP30/H265_8KP30-2.mp4The media file path to be played.--audiosink="alsasink device=hw:0,0"Specifies the Audio output device.
Note
The EM3576 supports 4K@60 video playback and decoding of VP8, H.264, H.265, VP9, and AV1, but H.265 compatibility depends on specific encoding profiles.