rt-thread/bsp/raspberry-pi/raspi3-32

Raspberry PI 3B 32 BSP (Board Support Package) Execution Instruction

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Introduction

This document records the execution instruction of the BSP (board support package) provided by the RT-Thread development team for the Raspberry PI 3B 32 development board.

Hardware Features

Hardware	Description
CPU	quad-core ARM Cortex A53(ARMv8)
Main Frequency	1.2 GHz
GPU	VideoCore IV
GPU Frequency	400MHz
Memory	1GB (0x0000000 - 0x40000000)
	0x3f000000 - 0x40000000 is for peripheral

The description of functional pins is as shown as follow:

Compilation Instruction

The env tool is recommended for compiling in Windows environments.

The cross-compiler gcc-arm-none-eabi-4_8-2014q1_linux is recommended in Linux environment. If you don’t have compiling tool, please uncompress the downloaded package like this:

tar vxf gcc-arm-none-eabi-4_8-2014q1_linux.tar.bz2

In Linux environment, you need to modify the settings of the compiler directory, and modify the actual directory of the compiling tool in bsp/raspi3-32/rtconfig. py, remember to add the suffix /bin here.

EXEC_PATH = r'/opt/gcc-arm-none-eabi-4_8-2014q1_gri/bin'

Enter the rt-thread/bsp/raspi3-32 directory and run the following command to compile this BSP:

scons

If everything goes well, a new 'rtthread.elf' and 'kernel7.img' file will be generated. ‘kernel7.img' is what we need to put into the root directory of the Raspberry PI 3B SD card.

Eclipse compiling environment

• Step 1: Install the eclipse plugin 'cdt'.
• Step 2: Open eclipse cdt and set workspace, and set the workspace to 'rt-thread/bsp/raspberry-pi/raspi3-32'.
• Step 3: Import the project by selecting 'General->Existing Projects into Workspace' and then 'Browse ...'. Noted that the compiling only supports scons now.
  

Running

Prepare the Raspbian SD card

Download the raspbian image, for example, "2018-06-27-raspbian-stretch-lite.zip". Unpack it.

Burn the SD card on Windows

On Windows, download the burning tool " etcher.io ", run it and choose the unpacked image "2018-06-27-raspbian-stretch-lite.img".

When the burning process is completed, put "kernel8.img" into the boot partition to replace the file wit the same name.

Burn the SD card on Linux

Prepare an empty SD card, plug it in the computer and then execute the command below:

"sudo dd if=2018-06-27-raspbian-stretch-lite.img of=/dev/xxx bs=32M conv=fsync"

Note that the device file "/dev/xxx" should be replaced with the real SD card.

Prepare the serial port wire

The BSP uses GPIO 14 & GPIO 15 of raspi 3 as the communication ports, as shown in the following image:

The serial port parameters: 115200 8N1, hardware and software flow control is off.

Running Result

Insert the burned SD card into Raspberry Pi, power up, the output information on the serial port should be like this:

heap: 0x0005d784 - 0x0045d784

 \ | /
- RT -     Thread Operating System
 / | \     4.0.2 build Jan  9 2020
 2006 - 2019 Copyright by rt-thread team
[I/I2C] I2C bus [i2c0] registered
[I/I2C] I2C bus [i2c1] registered
[I/SDIO] SD card capacity 15558144 KB.
found part[0], begin: 1048576, size: 63.0MB
found part[1], begin: 67108864, size: 14.793GB
file system initialization done!
boot cpu:3
msh />cpu = 0x00000003
cpu 3 startup.
start OK: CPU 3
boot cpu:2
cpu = 0x00000002
cpu 2 startup.
start OK: CPU 2
boot cpu:1
cpu = 0x00000001
cpu 1 startup.
start OK: CPU 1
Hello RT-Thread!

msh />

Peripheral Condition

Drive	Support	Remark
UART	Support	UART0
GPIO	Support	-
IIC	Support	-
SPI	Support	-
CPU Timer	Support	-
SD card driver	Support	-
RTC	Support	-
WDT	Support	-
MAILBOX	Support	-
SMP	Support	-
FRAMEBUFFER	Support	HDMI