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Customers may request access to the source-code of the firmware to modify it for their needs.

Commands & Registers (I2C)

I2C-Address: 0x40 (7-bit)

Register

Name

Access

Description

Default Value

0x01

REG_ID

read

ID-Register

0xA5

0x02

REG_CONTROL

write

Restart and boot with BOOT_MODE=
0x00 - Internal Fuses
0x01 - Serial Download
0x02 - uSDHC1 8-bit eMMC 5.1
0x03 - uSDHC2 4-bit SD 3.0

0x04 - Power Off

-

0x03

REG_CONFIG

-

-

-

0x04

REG_PIN_CONFIG

write

<Pin> <Parameter>
Parameter for GPIO:

1: Input, NoPull
10: Input, PullDown
11: Input, PullUp

20: Output PushPull, init low level
21: Output PushPull, init high level
40: Output, OpenDrain, init low level
41: Output, OpenDrain, init high level

-

0x05

REG_PIN_SET

write

<Pin> <Level>

-

0x06

REG_PIN_GET

write
read

<Pin>
Level of pin.

-

0x07

REG_PWM_CONFIG

write

<Pin> <Duty Cycle [%]>

-

0x08

REG_SECO_CODE

read

Read SECO_CODE

0x40

0x09

REG_INT_STATUS

read

Read INT_STATUS register, clear it and reset EC_IRQ#_OD to “1”

0x01: RTC_INT#
0x02: SMB_ALERT#
0x04: CPU_IRQ#

0x00

0x0A

REG_INT_ENABLE

write

Enable or disable interrupts.

0x01: RTC_INT#
0x02: SMB_ALERT#
0x04: CPU_IRQ#

-

0x0B

REG_ALTERNATE_
FUNCTION

write

Set Pin to specific alternate function.
For available alternate functions for pins refer to the list of configurable GPIO pins below.

<Pin> <Alternate Function>

Alternate Functions:
0x00: GPIO (Default: Input, NoPull)
0x01: PWM (Default: disabled)

-

0xF0

REG_VERSION

read

Read firmware version

0x01

Configurable GPIO Pins (I2C)

The following Pins are configurable via I2C:

Pin#

Name

Default Configuration

Alternate Function

0

GPIO0/CAM0_PWR#

Input, NoPull

1

GPIO1/CAM1_PWR#

Input, NoPull

2

GPIO2/CAM0_RST#

Input, NoPull

3

GPIO3/CAM1_RST#

Input, NoPull

4

GPIO4

Input, NoPull

5

GPIO5

Input, NoPull

PWM*

6

GPIO6

Input, NoPull

7

GPIO7

Input, NoPull

8

GPIO8

Input, NoPull

9

GPIO9

Input, NoPull

10

GPIO10

Input, NoPull

11

GPIO11

Input, NoPull

20

USB0_EN_OC#

Output, OpenDrain, init low level

21

USB1_EN_OC#

Output, OpenDrain, init low level

22

USB2_EN_OC#

Output, OpenDrain, init low level

23

USB3_EN_OC#

Output, OpenDrain, init low level

24

USB4_EN_OC#

Output, OpenDrain, init low level

25

USB_HUB_PEN

Output, PushPull, init low level

26

USB_HUB_RST#_1V8

Output, PushPull, init low level

27

ENET0_RST#_1V8

Output, PushPull, init low level

28

ENET1_RST#_1V8

Output, PushPull, init low level

29

EDP_BRG_EN

Output, PushPull, init low level

30

LCD0_VDD_EN

Output, PushPull, init low level

31

LCD0_BKLT_EN

Output, PushPull, init low level

32

LCD0_BKLT_PWM

PWM, disabled

GPIO

33

LCD1_VDD_EN

Output, PushPull, init low level

34

LCD1_BKLT_EN

Output, PushPull, init low level

35

LCD1_BKLT_PWM

PWM, disabled

GPIO

36

WIFI_DISABLE

Output, PushPull, init high level

37

WIFI_CLK_EN

Output, PushPull, init low level

38

WIFI_PWRDWN#

Output, PushPull, init low level

*: Not available on RevA0

Carrier board BOOT_SEL configuration

The BOOT_SEL[2:0] Configuration on the carrier board is used to determine the boot device by setting the BOOT_MODE[3:0] pins:

BOOT_SEL[2:0]#

BOOT_MODE[3:0]

Boot Device

0 0 1

0 0 1 1

Carrier SD Card

1 0 0

0 0 0 0

Boot from Fuse

1 0 1

0 0 0 1

Serial Download Mode

1 1 0

0 0 1 0

Module eMMC

Other Functions

  • Holding the RESET button for >= 10 seconds will cause the system to reboot into serial download mode rather than rebooting into the mode selected by the BOOT_SEL configuration of the carrier board.

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