LQ3399 Development board

system introduction

LQ3399 development board supports android6.0.1 operating system and adopts linux4. kernel. The module has been tested:

emmc driver

WY070ML 7 inch MIPI screen (1024x600)

LP079QXL-SP0V

Five-point touch capacitive screen (Silimicro GSL1680)

SD card

button

ADC

buzzer

Wake up from sleep

Three-way USB HOST2.0

All the way USB HOST3.0

One TYPEC interface

Audio decoding (ALC5651)

3G, 4G modules (PCIE interfaces move away from UC20, EC20 and various 3G dongles)

recording

trumpet

Optical audio output

motor

Four-way custom LED interface

AP6354 WIFI/BT combo module

G-sensor(LSM330TR)

Gyroscope (AK8963N)

Light sensor (CM32181)

MIPI CSI camera (OV5645 and OV13850)

Serial port

HDMI

Gigabit Ethernet RTL8211E

USB mouse and keyboard

HS0038B infrared integrated receiver

273

product description

The LQ3399 development board is composed of a stamp hole core board, a bottom plate and a liquid crystal board. The core board adopts a 10-layer board process design to ensure stability and reliability. It can be used in batches for tablet computers, car machines, learning machines, POS machines, game consoles, Industry monitoring and other fields. The backplane has a wealth of peripherals, which can demonstrate almost all the functions of the 3399 chip, onboard Gigabit Ethernet interface, onboard CSI interface, DSI interface, HDMI interface, EDP interface, TYPEC interface, USB3.0 interface, USB2.0 Interface, onboard audio fiber interface, onboard infrared integrated receiver, support infrared remote control function; onboard dual CSI interface, can support simultaneous external two MIPI cameras and display at the same time. Support software switch machine, sleep wakeup, etc. The LCD panel uses a 7-inch MIPI LCD screen by default, and an optional 7.9-inch 2K LCD screen, supports MIPI or EDP interface LCD screens, and supports stepless adjustment of backlight brightness.

LQ3399 Development Board The LQ3399 core board is suitable for VR, industrial control, electric power, communications, medical, media, security, automotive, finance, consumer electronics, handheld devices, game consoles, display control, teaching equipment and other fields. It can be widely used in POS, game consoles, teaching experiment platforms, multimedia terminals, PDAs, ordering machines, advertising machines and other fields.

276

Hardware resources

一、Hardware interface description

Hardware interface introduction
Label	name	illustrate
【1】	CPU	RK3399，A53,41.5GHz+A72,22GHz
【2】	DDR	K4E8E304EE-EGCF，LPDDR3，2GBytes
【3】	eMMC	KLMAG2GEND,16GB(4G,8G Optional)
【4】	RTC	RTC battery holder, CR1202
【5】	UART	UART4, TTL level interface
【6】	BEEP	buzzer
【7】	UART2	Serial port 2, default debugging serial port, RS232 level
【8】	SPDIF	Fiber output interface
【9】	DC Block	5V DC power input
【10】	POWER	Power button
【11】	Independent button	Volume up, used as Recovery key during upgrade
【12】	Independent button	Volume down
【13】	Independent button	return key
【14】	Independent button	menu
【15】	MIPI CSI	MIPI Camera interface
【16】	MIPI CSI+DSI	MIPI camera interface and DSI interface, can be connected to dual MIPI screens
【17】	MIPI DSI	The screen connected to the MIPI interface
【18】	RESET	Reset button
【19】	HDMI	HDMI Output Interface
【20】	TYPEC	TYPEC interface，Compatible with OTG function
【21】	USB3.0 interface	USB HOST3.0 interface
【22】	USB HOST	HOST2.0 interface，RK3399 Bring your own
【23】	USB HOST	HUB Chip expansion, two HOST2.0 interface
【24】	TF card	TF card socket
【25】	EDP	EDP interface
【26】	SIM card slot	3G, 4G mobile phone card slot
【27】	LED lights	Four programmable LED lights
【28】	Headphone holder	Headphone output
【29】	Speaker interface	External dual channel speakers
【30】	Speaker interface	External dual channel speakers
【31】	MIC	Headset, recording input
【32】	Camera interface	Standard 24PIN camera interface
【33】	Gigabit Ethernet	RT8211E interface
【34】	WIFI/BT	AP6354 WIFI/BT Two-in-one module
【35】	Infrared receiver	HS0038 infrared integrated receiver

二、Expansion interface definition:：

Pin number	Signal	type	describe
1	GPIO4_A3/I2S1_SCLK	GPIO Or I2S serial clock
2	GPIO4_A7/I2S1_SDO0	GPIO Or I2S data output
3	GPIO4_A6/I2S1_SDI0	GPIO Or I2S data input
4	GPIO4_A5/I2S1_LRCK_TX	GPIO Or I2S frame clock
5	GPIO4_A4/I2S1_LRCK_RX	GPIO Or I2S frame clock
6	GPIO4_A1/I2C1_SDA	GPIO or I2C1 data
7	GPIO4_A2/I2C1_SCL	GPIO or I2C1 clock
8	GPIO4_A0/I2S_CLK	GPIO or I2S master clock
9	GPIO3_D0/I2S0_SCLK	GPIO or I2S serial clock
10	GPIO3_D1/I2S0_LRCK_RX	GPIO or I2S frame clock
11	GPIO3_D2/I2S0_LRCK_TX	GPIO or I2S frame clock
12	GPIO3_D3/I2S0_SDI0	GPIO or I2S data input
13	GPIO3_D4/I2S0_SDI1	GPIO or I2S data input
14	GPIO3_D7/I2S0_SDO0	GPIO or I2S data output
15	GPIO3_D6/I2S0_SDO1	GPIO or I2S data output
16	GPIO3_D5/I2S0_SDO2	GPIO or I2S data output
17	GPIO4_D4	GPIO
18	ADC_IN2	ADC enter
19	GPIO2_C4/SDIO0_D0/ SPI5_RXD	GPIO or SDIO interface or
20	GPIO2_C5/SDIO0_D1/ SPI5_TXD	GPIO or SDIO Interface or SPI interface
21	GPIO2_C6/ SDIO0_D2/SPI5_CLK	GPIO or SDIO interface or SPI interface
22	GPIO2_C7/ SDIO0_D3/ SPI5_CSn0	GPIO or SDIO interface or SPI interface
23	GPIO2_D0/SDIO0_CMD	GPIO or SDIO interface
24	GPIO2_D1/SDIO0_CLK	GPIO or SDIO interface
25	GPIO2_C3/UART0_RTS	GPIO or serial port 0
26	GPIO2_C1/UART0_TXD	GPIO or serial port 0
27	GPIO2_C2/UART0_CTS	GPIO or serial port 0
28	GPIO2_C0/UART0_RXD	GPIO or serial port 0
29	PMU_RESET	Reset pin
30	GPIO4_D6	GPIO
31	GPIO4_D1	GPIO
32	GPIO4_D3	GPIO
33	GPIO4_C6/PWM1_d	GPIO j or PWM1
34	PMIC_EXT_EN	PMU Enable pin
35	RTC_CLKO_WIFI	32768Hz Clock output
36	Camera_RST_L	GPIO2_D3
37	VCC_RTC	RTC power input	Power input 2.5 to 3V
38	GPIO4_C2/PWM0	GPIO or PWM0
39	GPIO2_D4	GPIO
40	GPIO4_D2	GPIO
41	GPIO4_D5	GPIO
42	VCC3V3_S5	Secondary 3.3V power input	3.3V input, current is not less than 300mA
43	GPIO4_C5/SPDIF_TX	GPIO Or fiber output
44	GPIO4_C3/UART2DBG_RX	GPIO Or UART2
45	GPIO4_C4/UART2DBG_TX	GPIO Or UART2
46	GPIO4_C0/ I2C3_SDA/UART2_RX	GPIO Or I2C3 data or serial port 2
47	GPIO4_C1/ I2C3_SCL/ UART2_TX	GPIO Or I2C3 data or serial port 2
48	GPIO4_C7/HDMI_CEC	GPIO or HDMI CEC function
49	HDMI_HPD	HDMI hot plug detection pin
50	VCC_CHAREG_EN	PMIC enable
51	VCC3V3_SYS	Main 3.3V power input	3.3V input, power supply is not less than 4.3A
52	VCC3V3_SYS	Main 3.3V power input	3.3V input, power supply is not less than 4.3A
53	GND	Reference place
54	MIPI_TX1/RX1_D0N	DSI/CSI interface
55	MIPI_TX1/RX1_D0P	DSI/CSI interface
56	MIPI_TX1/RX1_D1N	DSI/CSI interface
57	MIPI_TX1/RX1_D1P	DSI/CSI interface
58	MIPI_TX1/RX1_CLKN	DSI/CSI interface
59	MIPI_TX1/RX1_CLKP	DSI/CSI interface
60	MIPI_TX1/RX1_D2N	DSI/CSI interface
61	MIPI_TX1/RX1_D2P	DSI/CSI interface
62	MIPI_TX1/RX1_D3N	DSI/CSI interface
63	MIPI_TX1/RX1_D3P	DSI/CSI interface
64	MIPI_RX0_D3N	CSI interface
65	MIPI_RX0_D3P	CSI interface
66	MIPI_RX0_D2N	CSI interface
67	MIPI_RX0_D2P	CSI interface
68	MIPI_RX0_CLKN	CSI interface
69	MIPI_RX0_CLKP	CSI interface
70	MIPI_RX0_D1N	CSI interface
71	MIPI_RX0_D1P	CSI interface
72	MIPI_RX0_D0N	CSI interface
73	MIPI_RX0_D0P	CSI interface
74	MIPI_TX0_D3N	CSI interface
75	MIPI_TX0_D3P	CSI interface
76	MIPI_TX0_D2N	CSI interface
77	MIPI_TX0_D2P	CSI interface
78	MIPI_TX0_CLKN	CSI interface
79	MIPI_TX0_CLKP	CSI interface
80	MIPI_TX0_D1N	CSI interface
81	MIPI_TX0_D1P	CSI interface
82	MIPI_TX0_D0N	CSI interface
83	MIPI_TX0_D0P	CSI interface
84	GND	Reference place
85	HDMI_TXCN	HDMI output interface
86	HDMI_TXCP	HDMI output interface
87	HDMI_TX0N	HDMI output interface
88	HDMI_TX0P	HDMI output interface
89	HDMI_TX1N	HDMI output interface
90	HDMI_TX1P	HDMI output interface
91	HDMI_TX2N	HDMI output interface
92	HDMI_TX2P	HDMI output interface
93	TYPEC0_SBU1_DC	TYPEC interface
94	TYPEC0_SBU2_DC	TYPEC interface
95	TYPEC0_SBU2	TYPEC interface
96	TYPEC0_SBU1	TYPEC interface
97	TYPEC0_RX1N	TYPEC interface
98	TYPEC0_RX1P	TYPEC interface
99	TYPEC0_TX1P	TYPEC interface
100	TYPEC0_TX1N	TYPEC interface
101	TYPEC0_RX2N	TYPEC interface
102	TYPEC0_RX2P	TYPEC interface
103	TYPEC0_TX2P	TYPEC interface
104	TYPEC0_TX2N	TYPEC interface
105	TYPEC0_DM	TYPEC interface
106	TYPEC0_DP	TYPEC interface
107	USB3_SSTXP	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
108	USB3_SSTXN	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
109	USB3_SSRXP	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
110	USB3_SSRXN	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
111	TYPEC0_U2VBUSDET	TYPECinterface
112	ADC_IN1	ADC1 input pin	The reference level is 1.8V
113	ADC_IN0	ADC0 input pin	The reference level is 1.8V
114	USB3_DM	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
115	USB3_DP	USB3.0 interface	TYPEC, USB3.0 multiplexing pin
116	HOST0_DM	USB3.0 interface
117	HOST0_DP	USB3.0 interface
118	HOST1_DM	USB3.0 interface
119	HOST1_DP	USB3.0 interface
120	VCC1V8_S3	1.8V power output	The voltage is 0 during sleep
121	POWER_KEY	PMU enable pin	Low level enable
122	GPIO2_D2	GPIO
123	GPIO0_A4	GPIO
124	GPIO0_B2	GPIO
125	GPIO0_B1	GPIO
126	GPIO0_A3	GPIO
127	GPIO4_B4/SDMMC0_CLK	GPIO or SDIO interface
128	GPIO4_B3/SDMMC0_D3	GPIO or SDIO interface
129	GPIO4_B2/SDMMC0_D2	GPIO or SDIO interface
130	GPIO4_B1/SDMMC0_D1	GPIO or SDIO interface
131	GPIO4_B0/SDMMC0_D0	GPIO or SDIO interface
132	GPIO4_B5/SDMMC0_CMD	GPIO or SDIO interface
133	GPIO0_A7/SDMMC0_DET	GPIO or SDIO interface
134	GPIO0_A1	GPIO
135	EDP_TX3P	EDP interface
136	EDP_TX3N	EDP interface
137	EDP_TX2P	EDP interface
138	EDP_TX2N	EDP interface
139	EDP_TX1P	EDP interface
140	EDP_TX1N	EDP interface
141	EDP_TX0P	EDP interface
142	EDP_TX0N	EDP interface
143	EDPAUXP	EDP interface
144	EDPAUXN	EDP interface
145	GPIO4_D0	GPIO
146	GPIO0_B3	GPIO
147	GPIO0_B0	GPIO
148	GPIO1_A1	GPIO
149	GPIO1_A0	GPIO
150	GPIO1_B4/I2C4_SCL	GPIO or I2C interface
151	GPIO1_B3/I2C4_SDA	GPIO or I2C interface
152	GPIO0_A2/RK3399_26M_OUT	GPIO port or 26M clock output pin
153	GPIO0_B4	GPIO
154	GPIO0_B5	GPIO
155	GPIO0_A6/	GPIO or PWM interface	The default is infrared receiving port
156	GPIO1_C7	GPIO
157	GPIO1_A4	GPIO
158	GPIO1_A3	GPIO
159	GPIO1_B5	GPIO
160	GPIO1_A2	GPIO
161	GPIO1_B0/SPI1_TXD	GPIO or SPI interface
162	GPIO1_B2/SPI1_CSn0	GPIO or SPI interface
163	GPIO1_B1/SPI1_CLK	GPIO or SPI interface
164	GPIO1_A7/SPI1_RXD	GPIO or SPI interface
165	GPIO1_C2/SPI3_CSn0	GPIO or SPI interface
166	GPIO1_C4/I2C8_SDA	GPIO or SPI interface
167	GPIO1_D0	GPIO
168	GPIO1_C6	GPIO
169	GPIO2_B3/ SPI2_CLK/ CIF_CLKO	GPIO or SPI interface or parallel camera interface
170	GPIO2_B0/ I2C7_SCL/ CIF_VSYNC	GPIO or SPI interface or parallel camera interface
171	GPIO2_A7/ I2C7_SDA/ CIF_D7	GPIO or SPI interface or parallel camera interface
172	GPIO2_A6/CIF_D6	GPIO or parallel camera
173	GPIO2_A5/CIF_D5	GPIO or parallel camera
174	GPIO2_A4/CIF_D4	GPIO or parallel camera
175	GPIO2_A3/CIF_D3	GPIO or parallel camera
176	GPIO2_A2/CIF_D2	GPIO or parallel camera
177	GPIO2_A1/ I2C2_SCL/CIF_D1	GPIO or I2C interface or parallel camera interface
178	GPIO2_A0/ I2C2_SDA/CIF_D0	GPIO or I2C interface or parallel camera interface
179	GPIO2_B4/SPI2_CSn0	GPIO or SPI interface
180	GPIO2_B1/ I2C6_SDA/CIF_HREF	GPIO or I2C interface or parallel camera interface
181	GPIO2_B2/ I2C6_SCL/ CIF_CLKI	GPIO or I2C interface or parallel camera interface
182	GND	Reference place
183	GPIO3_B6/ MAC_RXCLK/UART3_RX	GPIO or Gigabit Ethernet interface or serial port
184	GPIO3_B3/ MAC_MCLK/ I2C5_SCL	GPIO or Gigabit Ethernet interface or I2C interface
185	GPIO3_B0/ MAC_MDC/ SPI0_CSn1	GPIO or Gigabit Ethernet interface or SPI interface
186	GPIO3_A3/ MAC_RXD3/ SPI4_CSn0	GPIO or Gigabit Ethernet interface or SPI interface
187	GPIO3_A2/ MAC_RXD2/ SPI4_CLK	GPIO or Gigabit Ethernet interface or SPI interface
188	GPIO3_A7/ MAC_RXD1/ SPI0_CSn0	GPIO or Gigabit Ethernet interface or SPI interface
189	GPIO3_A6/ MAC_RXD0/ SPI0_CLK	GPIO or Gigabit Ethernet interface or SPI interface
190	GPIO3_C0/ MAC_COL/ UART3_CTSn/ SPDIF_TX	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
191	GPIO3_C1/ MAC_TXCLK/ UART3_RTSn	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
192	GPIO3_B2/ MAC_RXER/ I2C5_SDA	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
193	GPIO3_B7/ MAC_CRS/ UART3_TX	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
194	GPIO3_A4/ MAC_TXD0 SPI0_TXD	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
195	GPIO3_A5/ MAC_TXD1/ SPI0_TXD	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
196	GPIO3_A0/ MAC_TXD2/ SPI4_RXD	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
197	GPIO3_A1/MAC_TXD3/SPI4_TXD	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
198	GPIO3_B4/ MAC_TXEN/ UART1_RX	GPIO or Gigabit Ethernet interface or serial port or optical fiber interface
199	GPIO3_B5/ MAC_MDIO/ UART1_TX	GPIO or Gigabit Ethernet interface or serial port
200	GPIO3_B1/ MAC_RXDV	GPIO or Gigabit Ethernet

三、Hardware interface

1. Power switch and socket

LQ3399 uses 5V DC power supply. The socket in the picture is a 5V DC power input socket. Be careful not to exceed 5.5V. Although the power chip NB680GD on the baseboard supports 5 to 24V input, other peripherals on the baseboard are also directly powered from here, so If the voltage is too large, it will burn out a bunch of peripheral chips on the bottom board

2. Debugging serial port LQ3399 reserves a RS232 serial port UART2 for debugging, and a common TTL serial port UART4.

Note that UART2 is used as the debug serial port by default, and the user can adjust the debug serial port by modifying the program.

3. HDMI interface

The LQ3399 development board adopts the miniHDMI interface, and with the miniHDMI extension cable, it can perfectly present the audio and video signals on the monitoring terminal that supports the HDMI2.0 protocol, such as TVs, monitors, etc.

4. camera

This interface is a universal 24PIN camera interface, which supports the full range of OV cameras, eliminating the need for the camera adapter board. For different types of cameras, just adjust the output voltage according to the specifications of the camera. This interface is a universal 30PIN MIPI camera interface. If a flash is connected to the camera, it can support the function of the flash.

5. Ethernet interface

LQ3399 supports Gigabit wired Ethernet interface, onboard RTL8211E, users can surf the Internet through wired Ethernet, and experience the extremely fast network.

6 Headphone jack

Connect earphones to this interface to realize earphone output. Of course, it can also be directly sent to the power amplifier input through this interface, such as the audio input port of a home theater, so that the audio signal of the development board can be displayed through the home theater.

7. Speaker interface: The development board directly supports dual-channel 2W speaker output. Connect the speaker to the above interface to achieve speaker output.

8. Recording interface

The development board supports recording input. The headset has been directly loaded on the development board, no need to input through an external headset.

9. TF card slot

LQ3399 leads to an external TF card, which can be used to upgrade the TF card or store some multimedia files.

10. Independent buttons

LQ3399 has six buttons in total, including four independent buttons, a POWER button and a reset button. Independent keys obtain key values through ADC sampling. In the schematic diagram, the corresponding relationship is as follows:

switch

Function

VOL+

Volume plus key

VOL-

Volume down key

ESC

return key

POWER

Power button

RESET

Reset button

11. TYPEC interface

The TYPEC interface is a brand-new standard interface, which has the functions of fast transmission rate, large output voltage, two-way insertion and two-way transmission. This interface not only supports the traditional USB OTG for program programming and synchronization functions, but it can also drive HDMI, EDP, MIPI screens, the maximum voltage can reach 20V, to achieve the function of fast charging. It is foreseeable that it will be the mainstream of the USB interface in the future.

12. USB HOST interface

RK3399 comes with two USB HOST2.0 interfaces and two TYPEC interfaces, one of which is TYPEC, which is used as a USB3.0 interface on x3399. The leftmost interface in the figure above corresponds to USB3.0. The vertical USB socket on the right side of USB3.0 is a USB HOST2.0 interface that comes with RK3399, and there is a double-layer USB HOST interface on the right. It is another USB HOST2.0 interface that comes with RK3399 and is converted by a HUB chip. Come. Such a rich HOST interface is believed to have satisfied most of the application scenarios.

13. Power button

After connecting the external power adapter, press and hold the POWER button to turn it on. After entering the android system, touch the POWER button to sleep, and press the POWER button again to wake up. Long press the POWER button to display the shutdown interface, and follow the on-screen instructions to shut down.

14. Reset button. When the system is running, lightly press the RESET button to restart the development board to realize the function of hard reset.

15. Recovery button

The volume up button is used as the Recovery button during programming. You need to press this button to enter the recovery mode when flashing.

16. LCD interface

The LQ3399 development board has a 30PIN DSI interface by default, and the MIPI related signals are connected to the LCD control board through a flexible cable to control the LCD. At the same time, the 12th pin of the 30PIN interface is the PWM pin, which is used to control the backlight of the LCD, and realize multi-level backlight brightness adjustment through PWM. At the same time, it also leads to I2C for capacitive touch and interrupt and wake-up signals.

By default, RK3399 supports dual MIPI LCD control output function, which can drive 2K or even 4K screens. On the LQ3399, a dual-screen MIPI interface is also reserved. When you need to drive a screen with dual MIPI interfaces, just connect this interface. In addition, an EDP interface is reserved on the LQ3399 development board, which can also drive high-resolution screens.

17. Backup battery

The backup battery is used to ensure that the RTC can still work after the power is off, to ensure that the system time is not lost.

18. Buzzer

The buzzer is an active buzzer, it will beep when there is a direct current, and the power supply is controlled by a transistor to turn on and off. The hardware circuit controls the triode through a PWM, which can be used for PWM test or for sound prompts on appropriate occasions.

19. Infrared integrated receiver

The HS0038B integrated receiver is used here, which has the advantages of high sensitivity and convenient use. We can use it to realize wireless remote control and use the LQ3399 development board as a high-performance quad-core set-top box.

20. Optical fiber interface

The sound on the LQ3399 development board can not only be output through speakers, earphones, and HDMI, but also through optical fiber output to restore the most authentic sound. Connect to a high-fidelity speaker with an optical input interface through an optical fiber cable, and you can listen to the most realistic sound.

21. SIM card interface

There is a PCIE socket on the back of the LQ3399 development board, which is used to connect the 3G and 4G communication modules of the PCIE interface. Of course, when using 3G and 4G, you need to insert the corresponding mobile phone card into this SIM card slot.

22. WIFI Bluetooth module

The LQ3399 development board comes standard with a SDIO interface WIFI/BT module with 2.4G and 5G dual-band WIFI. The left and upper sides of the above figure are the corresponding PCB antennas of the module.

267

Software description

The Android operating system is installed on the LQ3399 by default. If users want to run other operating systems, they need to use the corresponding firmware to burn to the motherboard.

LQ3399 has a flexible starting method. Under normal circumstances, unless the hardware is damaged, the LQ3399 development board will not be bricked.

If an accident occurs during the upgrade process and the bootloader is damaged, making it impossible to upgrade again, you can still enter the MaskRom mode to repair it.

Upgrade method

LQ3399 supports the following two ways to upgrade the firmware:

Use a USB cable to upgrade the firmware: Use a USB cable to connect the motherboard to the computer, and use the upgrade tool to burn the firmware onto the motherboard.

Use MicroSD card: Use the upgrade card creation tool to make the MicroSD card into an upgrade card, insert the upgrade card into the motherboard, power on, and the machine will automatically perform the upgrade.

Boot memory

LQ3399 loads the system from the following memories:

eMMC interface

SDMMC interface

NOR flash interface

Start mode

LQ3399 has three startup modes:

Normal mode

Loader mode

MaskRom mode

Normal mode

Normal mode is the normal startup process. Each component is loaded in turn and enters the system normally.

Loader mode

In Loader mode, the bootloader will enter the upgrade state, waiting for host commands for firmware upgrades, etc. To enter the Loader mode, the bootloader must detect that the RECOVERY button is pressed during startup and the USB is connected.

The method to make the device enter the upgrade mode is as follows:

1. One way is to disconnect the power adapter

Connect the device and the host with a double male USB data cable.

Press and hold the RECOVERY button on the device.

After plugging in the power supply for about two seconds, release the RECOVERY button.

2. Another way is to connect the power adapter

Connect the device and the host with a double male USB data cable.

Press and hold the RECOVERY button on the device.

Briefly press the RESET button.

After about two seconds, release the RECOVERY button.

MaskRom mode

MaskRom mode is used to repair the system when the bootloader is damaged.

Generally, it is not necessary to enter the MaskRom mode. Only when the bootloader verification fails (the IDR block cannot be read, or the bootloader is damaged), the BootRom code will enter the MaskRom mode. At this time, the BootRom code waits for the host to transmit the bootloader code through the USB interface, load and run it.

270

<<return to previous page