dbroqua/kobol-wiki
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

updating hardware, uext, and m2 pages

Browse source
This commit is contained in:
nurix87 2020-03-10 19:44:01 +07:00
parent 313e27c556
commit 0ba0c295fd
12 changed files with 42 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

38
docs/helios64/i2c.md
View file

@ -3,11 +3,23 @@
Helios64 support I2C bus for the low-speed communication between devices like microcontrollers, EEPROMs, A/D and D/A converters, I/O interface and other similar peripherals in embedded systems.
In order to communicate with each I2C slave device you will need an address and communication scenario.
Helios64 board exposes the SoC I2C Bus 1, on header **P1**. Below is the header pin-out.
Please take caution of the reserved address when you use the I2C interface, below is the reseved address list:
### I2C bus on Helios64 / RK3399K
Slave Address | R/W Bit | Description
--------------|---------|-------------------
000 0000 | 0 | General call address
000 0000 | 1 | START byte(1)
000 0001 | X | CBUS address(2)
000 0010 | X | Reserved for different bus format (3)
000 0011 | X | Reserved for future purposes
000 01XX | X | Hs-mode master code
111 10XX | X | 10-bit slave addressing
111 11XX | X | Reserved for future purposes
The I2C controller on RK3399K support following features:
### I2C bus on Helios64 / RK3399
The I2C controller on RK3399 support following features:
- 9 on-chip I2C controllers
- Multi-master I2C operation
@ -62,6 +74,8 @@ All the I2C bus in the board are using voltage level of 3.3V, please notice Heli
#### I2C at P1 Header
Helios64 board exposes the SoC I2C Bus 1, on header **P1**. Below is the header pin-out.
![I2C Pinout](/helios64/img/hardware/i2c_pinout.png)
This I2C device working with 3 pin bus (SDA, SCK, and GND), and also in band addressing.
@ -87,20 +101,6 @@ Pin No | Description
9|SCK (SPI)
10|SSEL (SPI)
Please take caution of the reserved address when you use the I2C interface, below is the reseved address list:
Slave Address | R/W Bit | Description
--------------|---------|-------------------
000 0000 | 0 | General call address
000 0000 | 1 | START byte(1)
000 0001 | X | CBUS address(2)
000 0010 | X | Reserved for different bus format (3)
000 0011 | X | Reserved for future purposes
000 01XX | X | Hs-mode master code
111 10XX | X | 10-bit slave addressing
111 11XX | X | Reserved for future purposes
### Usage under Linux
#### External bus block device under linux
@ -109,8 +109,8 @@ Below table describe the external bus of I2C under Linux,
Bus number | Device Block | Description |
-----------|--------------|--------------|
7 | /dev/i2c-0 | |
8 | /dev/i2c-1 | |
7 | /dev/i2c-7 | |
8 | /dev/i2c-8 | |
#### Checking the I2C Communication under linux