Product Introduction

Let's get to know the P2pro in 5 minutes.

Overview

The ArmSoM-P2pro is powered by the Rockchip RK3308B-S, which comes with a 64-bit quad-core ARM Cortex-A35 processor, USB, Ethernet, Bluetooth, wireless connectivity and a voice detection engine.With rich audio interfaces (such as MIC/PDM/SPDIF/I2S),RK3308 is ideal product for IoT and voice applications. The ArmSoM-p2pro uses 512MB DDR3 RAM and uses eMMC (optional) or SD card as the storage of operating system.

ArmSoM-P2pro

Key Parameters

SoC: Rockchip RK3308
CPU: Quad-core ARM Cortex-A35@ 1.2GHz, 28nm
RAM: 512MB DDR3
Flash: 8GB eMMC, optional
WiFi&Bluetooth: 802.11 a/b/g/n/ac & BT5.0 (AP6256)
Operating voltage: Wide range input voltage, 5V (voltage tolerance ±5%)
Operating temperature: 0°C ~ 70°C
Operating system:
- Officially supported by Rockchip: Debian11, Buildroot
- Third party support: istoreos (openwrt)
Weight:
Size: 52.5mm × 65mm

Hardware

Hardware Interface

armsom-p2pro-layout

tip

The PoE module and eMMC module of P2pro are not equipped by default. They are optional choices.

rk3308b-s Block Diagram

Hardware Spec

P2pro Hardware Spec

Model	ArmSoM-p2 pro
SoC	RockChip RK3308B-S
CPU	Quad-core ARM Cortex-A35@1.3GHz
RAM	256MB/512MB, DDR3
Flash	8GB, eMMC optional. Support MicroSD card expansion
Networking	1x 100Mbit/s Ethernet(PoE optional),802.11 a/b/g/n/ac & BT5.0 (AP6256)
USB	1x USB 2.0,1x USB Type-C
Audio Input	8x MIC(40PIN Header),1x PDM/I2S(40PIN Header)
Audio Output	2x Line out(40PIN Header),1x SPDIF out(40PIN Header),1x Audio Jack
Other Interfaces	1x SPI/UART(12PIN Header),1x I2S(40PIN Header;8channel,SDI=4CH,SDO=4CH),1x I2C(12PIN Header),1x UART(12PIN Header),2x PWM(12PIN Header),1x ADC(40PIN Header)
Buttons	1x Reset Button,1x Recovery Button
LED	1x LED(RGB)
Power Supply	USB Type-C(5V/2A)
OS	Debian11, Buildroot,istoreos
Dimensions	65mm x 52.5mm
Weight	30g
Operating Temperature	0°C ~ 70°C

Hardware Pin Definition

40-PIN GPIO

GPIO number	Function	Pin	Pin	Function	GPIO number
	+3.3V	1	2	+5.0V
	ADC_KEY_IN1	3	4	+5.0V
69	GPIO2_A5 / I2S0_SCLK_TX	5	6	SPDIF_TX / GPIO0_C1	17
70	I2S0_SCLK_RX / GPIO2_A6 / PDM_CLK	7	8	I2S0_LRCK_TX / GPIO2_A7	71
68	I2S0_8CH_MCLK / GPIO2_A4 / I2S0_MCLK	9	10	I2S0_LRCK_RX / GPIO2_B0	72
73	GPIO2_B1 / I2S0_SDO0	11	12	PDM_SDI0 / GPIO2_B5 / I2S0_SDI0	77
74	GPIO2_B2 / I2S0_SDO1	13	14	PDM_SDI1 / GPIO2_B6 /I2S0_SDI1	78
75	GPIO2_B3 / I2S0_SDO2	15	16	PDM_SDI2 / GPIO2_B7 / I2S0_SDI2	79
76	GPIO2_B4 / I2S0_SDO3	17	18	GPIO2_C0 / PDM_SDI3 / I2S0_SDI3	80
	GND	19	20	GND
	LINEOUT_L	21	22	LINEOUT_R
	MICBIAS1	23	24	MICBIAS2
	MICP1	25	26	MICN1
	MICP2	27	28	MICN2
	MICP3	29	30	MICN3
	MICP4	31	32	MICN4
	MICP5	33	34	MICN5
	MICP6	35	36	MICN6
	MICP7	37	38	MICN7
	MICP8	39	40	MICN8

12-PIN GPIO

GPIO number	Function	Pin	Pin	Function	GPIO number
65	UART0_TX / GPIO2_A1 / SPI0_TX	1	2	I2C1_SDA / GPIO0_B3	11
64	UART0_RX / GPIO2_A0 / SPI0_RX	3	4	I2C1_SCL / GPIO0_B4	12
56	SPI2_CS / I2C0_SCL / GPIO1_D1 / UART1_TX	5	6	VCC_IO +3.3V	17
57	SPI2_CLK / I2C0_SDA / GPIO1_D0 / UART1_TX	7	8	GND
55	JTAG_TMS / UART2_TX_M0 / GPIO1_C7 / SPI2_TX	9	10	PWM2 / GPIO0_B7 / I2C3_SDA	15
54	JTAG_TCK / UART2_RX_M0 / GPIO1_C6 / SPI2_RX	11	12	PWM3 / GPIO0_C0 / IR_RX	16

Resources

Source Code

📚

Source Code

Linux for ARM development boards

Official Image

ArmSoM team uses Debian bullseye as the official operating system.

Download

The following systems have been tested and verified by ArmSoM official:

Network disk address:

Google Drive link

logo	Description	Download
	debian11 for P2pro : Debian 11, codenamed "Bullseye," is the latest stable release of the Debian project, released on August 14, 2021. Debian is an operating system based on free software known for its stability, security, and openness.	Google Drive link

Third Party System

logo	Description	Download
Openwrt	Openwrt for P2pro : Openwrt is a highly modular and automated embedded Linux system with powerful network components and scalability.	Google Drive link

Hardware Resources

📄

p2pro SCH

📃

p2pro 2D

📜

p2pro SMD

📑

Datasheet

Version Change History

v1.0 is an internal version (fail to disclose now)

User Manual

The P2pro user manual helps users understand the basic usage and preparation work needed for P2pro.

Its model and hardware version can be found printed on the board when you got P2pro.

This article gives an overview of the product information to you in as much detail as possible.

Getting Started

Before starting to use ArmSoM-P2pro, please prepare the following items

Tool Preparation

P2pro main board
Power supply: USB Type-C
- Support 5V/2A
System Installation (choose one)
- MicroSD card/TF card boot
  - MicroSD card/TF card, Class 10 or above, at least 8GB SDHC and card reader
  - The following are high-speed TF cards tested and verified by the ArmSoM team
    - SanDisk 32GB TF (MicroSD) (Developer Recommended)
    - SanDisk 32GB TF (MicroSD) Driving Recorder & Security Surveillance Dedicated Storage Card (Long Term Running Recommended)
    - Sandisk TF 8G Class10 microSD
    - Sandisk TF 128G Class10 microSD XC TF 128G 48MB/S:
- Onboard eMMC boot
  - USB Type-C data cable, P2pro typec port connected to computer, write image.

Optional Options

Ethernet cable
- P2pro supports Ethernet access, up to 100M.
- The network cable is used to connect P2pro to the local network and the Internet.
Wireless WIFI
- P2pro supports wireless Internet access, and supports 802.11 a/b/g/n/ac & BT5.0 (AP6256)
Audio cable
- You can play audio through speakers or headphones using a standard 3.5 mm jack.
USB-A to USB-C data cable

Image Flashing

Flash System Image

Interface Setup

If this is your first time using the ArmSoM-P2pro, please familiarize yourself with the [Peripheral Interfaces](#Hardware Interface) first to better understand the following.

100M Ethernet

If you are using wired Ethernet access, please insert the network cable into the RJ45 port on ArmSoM-P2pro, and the network port light flashes,indicating hardware connected properly.

Manually configure Ethernet

Switch to root user

sudo su

Check if Ethernet is working properly with the ifconfig command, and it will display the network card eth0 and Ethernet IP address. In addition, use the ping tool to determine if the network is connected.

ifconfig
ping www.baidu.com  

If unable to ping, please try

$ sudo dhclient eth0

Debug Serial Port

The debug serial port location is pin 9 and 11 of the 12-pin header

P2pro	Connection	Serial Module
GND (pin 8)	--->	GND
TX (pin 9)	--->	RX
RX (pin 11)	--->	TX

armsom-p2pro-debug

WIFI

# 1. Open the WIFI
root@linaro-alip:/# nmcli r wifi on
# 2. Scan WIFI
root@linaro-alip:/# nmcli dev wifi
# 3. Connect to WIFI network
root@linaro-alip:/# nmcli dev wifi connect "wifi_name" password "wifi_password"

p2pro wifi	2.4G	5G
debian	Tx 25 Mbps Rx 46 Mbps	Tx 130 Mbps Rx 132 Mbps
istoreos	Tx 131 Mbps Rx 130 Mbps	Tx 194 Mbps Rx 193 Mbps

BT

# 1. Activate Bluetooth
root@linaro-alip:/# service bluetooth start
# 2. Enter bluetoothctl
root@linaro-alip:/# bluetoothctl
# 3. Enter the following command to connect
root@linaro-alip:/# power on
root@linaro-alip:/# agent on
root@linaro-alip:/# default-agent
root@linaro-alip:/# scan on
root@linaro-alip:/# pair yourDeviceMAC

Audio

View sound cards in the system:

root@linaro-alip:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: rockchiprk3308a [rockchip,rk3308-acodec], device 0: dailink-multicodecs ff560000.acodec-0 [dailink-multicodecs ff560000.acodec-0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 7: Loopback [Loopback], device 0: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 7: Loopback [Loopback], device 1: Loopback PCM [Loopback PCM]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7

play music

root@linaro-alip:/# aplay -D plughw:0,0  ./usr/share/sounds/alsa/Rear_Right.wav

USB Interface

ArmSoM-P2pro provides a USB 2.0 port.

Mic Interface

armsom-p2pro-8mic

View All Built-in Codec Gains

amixer contents

The headphone output sound is too low

Check the current left and right channel output gain of the codec:

amixer cget name='DAC HPOUT Left Volume'
amixer cget name='DAC HPOUT Right Volume'

Adjust the base gain as needed:

amixer cset name='DAC HPOUT Left Volume' 18
amixer cset name='DAC HPOUT Right Volume' 18

Adjust volume (percentage):

amixer cset name='Master Playback Volume' 40

recording

Mic gain adjustment for built-in codec

Group 0: mic1/mic2; Group 1: mic3/mic4; Group 2: mic5/mic6; Group 3: mic7/mic8
The prefix "ADC MIC" indicates adjustment of the linear gain of the front-stage MIC PGA
The prefix "ADC ALC" indicates adjustment of the linear gain of the back-stage ALC

amixer cset name='ADC MIC Group 0 Right Gain'  3
amixer cset name='ADC MIC Group 0 Left Gain'  3
amixer cset name='ADC ALC Group 0 Left Volume'  31
amixer cset name='ADC ALC Group 0 Right Volume'  31

amixer cset name='ADC MIC Group 1 Right Gain'  3
amixer cset name='ADC MIC Group 1 Left Gain'  3
amixer cset name='ADC ALC Group 1 Left Volume'  31
amixer cset name='ADC ALC Group 1 Right Volume'  31

amixer cset name='ADC MIC Group 2 Right Gain'  3
amixer cset name='ADC MIC Group 2 Left Gain'  3
amixer cset name='ADC ALC Group 2 Left Volume'  31
amixer cset name='ADC ALC Group 2 Right Volume'  31

amixer cset name='ADC MIC Group 3 Right Gain'  3
amixer cset name='ADC MIC Group 3 Left Gain'  3
amixer cset name='ADC ALC Group 3 Left Volume'  31
amixer cset name='ADC ALC Group 3 Right Volume'  31

export ALSA_LIB_ADD_GAIN=3

// When the sampling rate is greater than 16000hz, the recording command should add the parameters --period-size=1024 --buffer-size=4096
arecord -D hw:0,0 -c 8 -r 44100 -f S16_LE --period-size=1024 --buffer-size=4096 test.wav

Easy to buy sample

ArmSoM online shop: https://www.armsom.org/product-page/p2pro

ArmSoM Aliexpress online shop: https://www.aliexpress.com/item/3256805779421715.html

ArmSoM Taobao shop: https://item.taobao.com/item.htm?id=735000017740

OEM&ODM, please contact: sales@armsom.org

Product Introduction

Overview​

Key Parameters​

Hardware​

Hardware Interface​

rk3308b-s Block Diagram​

Hardware Spec​

Hardware Pin Definition​

Resources​

Source Code​

Source Code

Official Image​

Download​

Third Party System​

Hardware Resources​

p2pro SCH

p2pro 2D

p2pro SMD

Datasheet

User Manual​

Getting Started​

Tool Preparation​

Optional Options​

Image Flashing​

Interface Setup​

100M Ethernet​

Debug Serial Port​

WIFI​

BT​

Audio​

USB Interface​

Mic Interface​

Easy to buy sample​

Overview

Key Parameters

Hardware

Hardware Interface

rk3308b-s Block Diagram

Hardware Spec

Hardware Pin Definition

Resources

Source Code

Official Image

Download

Third Party System

Hardware Resources

User Manual

Getting Started

Tool Preparation

Optional Options

Image Flashing

Interface Setup

100M Ethernet

Debug Serial Port

WIFI

BT

Audio

USB Interface

Mic Interface

Easy to buy sample