Embest Sbc6845 User manual

SBC6845

Single

Single Board

Board

Board Computer

Computer

User

User Manual

Manual

(For

(For Linux

Linux

Linux System)

System)

Version 1.1 – Jan.11.2013

Embest Technology

i

Copyright

Copyright Statement:

Statement:

SBC6845 and its related intellectual property are owned by Shenzhen Embest

Technology Co., Ltd.

Shenzhen Embest Technology has the copyright of this document and reserves

all rights. Any part of the document should not be modified, distributed or

duplicated in any approach and form with the written permission issued by

Embest Technology Co., Ltd.

Disclaimer:

Shenzhen Embest Technology does not take warranty of any kind, either

expressed or implied, as to the program source code, software and documents

in the CD/DVD-ROMs provided along with the products, and including, but not

limited to, warranties of fitness for a particular purpose; The entire risk as to the

quality or performance of the program is with the user of products; Should the

program prove defective, the user of products assumes the cost of all

necessary servicing, repair or correction.

Revision

Revision History:

History:

Version

Version Date

Date

Date Note

Note

1.0 2012-11-16 Original Version

1.1 201 3 - 01 -

11

First Revision

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Table

Table of

of

of Contents

Contents

Chapter

Chapter 1

1

1 Product

Product

Product Overview

Overview

Overview .....................................................................................................

.....................................................................................................

..................................................................................................... 1

1

1.1 Introduction ....................................................................................................................... 1

1.2 Packing List ...................................................................................................................... 1

1.3 Product Features ............................................................................................................. 1

1.4 Components on SBC6845 .............................................................................................. 3

1.5 Hardware Dimensions ..................................................................................................... 4

1.6 BSP Package in CD-ROM .............................................................................................. 4

Chapter

Chapter 2

2

2 System

System

System Boot-up

Boot-up

Boot-up and

and

and Testing

Testing

Testing .................................................................................

.................................................................................

................................................................................. 6

6

2.1 System Boot-up ................................................................................................................ 6

2.2 Example Applications ...................................................................................................... 7

2.3 Introduction to API ........................................................................................................... 9

2.4 Starting Testing .............................................................................................................. 12

2.4.1 Touch-Screen Testing ........................................................................................ 12

2.4.2 LCD Color Testing .............................................................................................. 12

2.4.3 LCD Backlight Testing ........................................................................................ 13

2.4.4 Ethernet Testing .................................................................................................. 13

2.4.5 Serial Interface Testing ...................................................................................... 14

2.4.6 CAN Bus Testing ................................................................................................ 14

2.4.7 RS485 Bus Testing ............................................................................................. 15

2.4.8 USB Testing ......................................................................................................... 16

2.4.9 RTC Testing ......................................................................................................... 17

2.4.10 SD Card Testing ............................................................................................... 18

2.4.11 LED Testing ....................................................................................................... 19

2.4.12 Buzzer Testing .................................................................................................. 19

2.4.13 GPIO Testing ..................................................................................................... 20

2.4.14 ADC Testing ...................................................................................................... 21

2.4.15 Button Testing ................................................................................................... 22

2.4.16 Keypad Testing ................................................................................................. 23

2.4.17 Screen Capture Testing ................................................................................... 24

2.4.18 Audio Testing ..................................................................................................... 24

2.4.19 Telnet Login Testing ......................................................................................... 24

2.4.20 Mounting NFS Network Filesystem ............................................................... 27

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2.4.21 Transferring Files by Using SecureCRT ....................................................... 28

2.4.22 Transferring Files over Network ..................................................................... 29

2.4.23 Linux QT Demonstration ................................................................................. 31

Chapter

Chapter 3

3

3 Development

Development

Development Environment

Environment

Environment and

and

and System

System

System Compilation

Compilation

Compilation ...................................

...................................

................................... 32

32

3.1 Building a Cross Compilation Environment ............................................................... 32

3.2 System Compilation ...................................................................................................... 33

3.2.1 Uncompressing Files ......................................................................................... 33

3.2.2 Making Bootstrap ................................................................................................ 34

3.2.3 Making U-boot ..................................................................................................... 34

3.2.4 Making Kernel ..................................................................................................... 34

3.2.5 Making Filesystem Image ................................................................................. 35

Chapter

Chapter 4

4

4 System

System

System Customization

Customization

Customization ..........................................................................................

..........................................................................................

.......................................................................................... 36

36

4.1 Kernel Customization .................................................................................................... 36

4.2 Filesystem Customization ............................................................................................ 37

4.3 Simple Driver Modules in Kernel ................................................................................. 37

4.3.1 Using Makefile to Associate Drivers with Kernel ........................................... 40

4.3.2 Compiling and Downloading Drivers ............................................................... 40

4.4 Brief Introduction to Applications ................................................................................. 41

4.4.1 Compiling and Running Applications ............................................................... 42

4.4.2 Common Functions ............................................................................................ 42

4.5 Linux Multi-Thread Programming ................................................................................ 43

4.6 Linux Network Programming ........................................................................................ 45

4.6.1 Compiling Server and Client ............................................................................. 48

Chapter

Chapter 5

5

5 Updating

Updating

Updating Linux

Linux

Linux System

System

System .........................................................................................

.........................................................................................

......................................................................................... 49

49

5.1 Image Mapping and Burning ........................................................................................ 49

5.2 Burning System Image Manually ................................................................................ 50

5.2.1 Preparations ........................................................................................................ 50

5.2.2 Burning Bootstrap File ....................................................................................... 53

5.2.3 Burning U-boot File ............................................................................................ 54

5.2.4 Burning Logo File ............................................................................................... 55

5.2.5 Burning uImage File ........................................................................................... 56

5.2.6 Burning Linux System ........................................................................................ 57

5.3 Burning System Image Automatically ......................................................................... 60

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Technical

Technical Support

Support

Support and

and

and Warranty

Warranty

Warranty ............................................................................................

............................................................................................

............................................................................................ 62

62

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Chapter

Chapter 1

1

1 Product

Product

Product Overview

Overview

1.1

1.1 Introduction

Introduction

SBC6845 is an ARM embedded single board computer designed by Shenzhen Embest

Technology Co., Ltd. It is a small-sized board based on Atmel

’

s industrial microprocessor

AT91SAM9G45 and featured with 128MB DDR2 SDRAM, 256MB NAND Flash and 4MB

Data Flash, as well as abundant interfaces including 5 RS232 serial interfaces (COM2 is

RS485), a CAN interface, an Ethernet interface, a high-speed USB host interface, a

SD/MMC card interface and an audio output interface.

SBC6845 is designed to satisfy the different requirements of various fields such as

industrial control, intelligent instrumentation, data acquisition and analysis, medical

products and network equipments.

1.2

1.2 Packing

Packing

Packing List

List



A

SBC6845 board



A

serial cable



A

network cable



A

USB cable



A

12V power adapter



A

LCD touch-screen (optional item, available in 4.3-inch 480*272 or 7-inch

800*480 )



A

CD-ROM

1.3

1.3 Product

Product

Product Features

Features

Dimensions: 106.5mm x 94mm (6-layer PCB)

Operation temperature: -40 ~ + 85 ℃

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Operating Humidity: 0% ~ 90%

Power Supply: 12V/1.25A

Processor: Atmel AT91SAM9G45

On-Board Memories:

64MB*2 DDR2 SDRAM

256MB NAND Flash

4MB Data Flash

Audio/Video Output Interfaces:



A

3.5mm jack



A

2*20-pin DIP interface for LCD touch-screen



A

buzzer

Data Transfer Interfaces:

5 serial interfaces



A

CAN 2.0 interface (isolated)

2 USB 2.0 interfaces



A

10/100Mb Ethernet interface



A

SD card slot (hot plugging)

Pins for SPI , I2C , PWM , ADC , Keypad and GPIO

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1.4

1.4 Components

Components

Components on

on

on SBC6845

SBC6845

USB Host

Ethernet

Audio Out

Debug

Power

Touch

Buzzer

LCD

LED

Panel

Keypad

16 GPIO

SPI&IIC&PWM&ADC

DEBUG&COM0&COM1&COM2(RS485)&COM

DEBUG&COM0&COM1&COM2(RS485)&COM 3

3

Reset Key

CAN

RS485

User Key

Power

AT91SAM9G45

DDR

DDR 2

2

DDR

DDR 2

2

NandFlash

Figure

Figure 1-1

1-1

1-1 Components on SBC6845

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1.5

1.5 Hardware

Hardware

Hardware Dimensions

Dimensions

Figure

Figure 1-2

1-2

1-2 Hardware Dimensions

1.6

1.6 BSP

BSP

BSP Package

Package

Package in

in

in CD-ROM

CD-ROM

The CD-ROM provided along with SBC6845 contains a BSP package that helps

development the Linux system. U sers can make a custom system running on SBC6845

platform by utilizing the package. The table shown below lists out the contents of the

BSP attached with the corresponding descriptions.

Table

Table 1-1

1-1

1-1 BSP

BSP

BSP Package

Package

Categories

Categories Names

Names

Names Descriptions

Descriptions

BIOS

Bootstrap

DATA

FLASH

u-boot

DATA

FLASH

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Categories

Categories Names

Names

Names Descriptions

Descriptions

Supports downloading kernel and file system through SAM-BA and

network

Kernel

Kernel Linux-2.6.30 ROM/CRAM/EXT2/EXT3/FAT/NFS/JFFS2/YAFFS2 file systems

Device

Drivers

Serial Drivers for 4 serial interfaces and a debug interface built in CPU

RTC AT91SAM9G45 extension RTC driver

NET 10/100M Ethernet driver

Flash NAND FLASH and

DATA

FLASH drivers

LCD LCD driver supporting 480x272, 640x480, 800x480 and 800x600

Touch Screen Driver for touch-screen controller built in CPU

USB Host USB Host driver

Watchdog B uilt-in watchdog driver

SD Card SD card driver

CAN 总线 Driver for an extension CAN bus

RS-485 Driver for an extension RS-485 bus

LED Driver for 4 LED indicators

BEEP Buzzer driver

Sound AC97 Codec audio driver

Button Driver for 2 custom keys

Keypad Driver for 6x6 matrix keyboard

GPIO Driver for 16 GPIO

ADC Driver for 10bit ADC

Root

Filesystem

YAFFS2 Readable and writable filesystem

Graphic

Interface

Qt Version 4.4.2

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Chapter

Chapter 2

2

2 System

System

System Boot-up

Boot-up

Boot-up and

and

Testing

2.1

2.1 System

System

System Boot-up

Boot-up

SBC6845 can support boot-up from Data Flash only.

A

default Linux system image has

been burned in Data Flash when it is manufactured. I f you need to update the image,

please refer to the contents of Chapter 5 Updating Linux System .

Before you power up the board, you need to set the video output resolution of the board

by applying a specific jumper configuration on SBC6845. The table shown below lists

different configurations of the jumpers.

Table

Table 2-1

2-1

2-1 Jumper

Jumper

Jumper Configurations

Configurations

JP11

JP11 JP10

JP10

JP10 S

S

S izes

izes

izes of

of

of LCD

LCD

LCD Resolutions

Resolutions

Resolutions of

of

of LCD

LCD

0 0 4.3 inches 480x272

0 1 5.6 inches 640x480

1 0 7.0 inches 800x480

1 1 10.4 inches 800x600

Additionally, you need to set up a HyperTerminal on your PC according to the serial

interface configuration window shown below.

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Figure

Figure 2-2

2-2

2-2 Setting up HyperTerminal

Now you can connect the power supply to SBC6845 and see the boot-up information

displayed in HyperTerminal.

2.2

2.2 Example

Example

Example Applications

Applications

T here are lots of example applications can be found under /home/app of the default

Linux system on SBC6845. Users can test or demonstrate the functions of board by

taking advantage of these programs. The diagram shown below can help you find them

more easily.

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can_test_1000k

/home/app

adc

beep

can

can_test_100k

can_test_10k

can_test_125k

can_test_20k

can_test_250k

can_test_500k

can_test_50k

can_test_750k

can_test_800k

com

evtest

gpio

lcd

led

ADC testing

Buzzer testing

CAN testing over different frequencies

Serial interface and RS485 testing

Testing for buttons, keypad, touch-screen, etc.

GPIO testing

LCD testing

LED testing

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2.3

2.3 Introduction

Introduction

Introduction to

to

to API

API

Before you get started with testing, it

’

s necessary to learn something about the API

functions used by example applications. If you ’ d like to look into the details of how the

programs are working, please view the source code under \ Linux 2.6 Kit\01

SourceCode\application\ in the SBC6845

’

s CD-ROM.

The tables listed below are the API functions called by some of the example applications

we provided in the CD-ROM, as well as the descriptions attached to each function.

Table

Table 2-2

2-2

2-2 LED

LED

LED API

API

API Function

Function

API

API Function

Function

Function for

for

for LED

LED

LED_API

LED_API int

int

int led_ctrl

led_ctrl

led_ctrl (char

(char

(char *name,

*name,

*name, int

int

int onoff);

onoff);

Source

Source ledlib.h

Function

Function Turn on/off LED indicators

Parameters

name (LED name, e.g. D6, D9 or D13)

on/off (0 for off, 1 for on)

Returned

Returned Value

Value

Value 0 for success , otherwise failure

Example

Example led_ctrl ("D9", 1);

Table

Table 2-3

2-3

2-3 Buzzer

Buzzer

Buzzer API

API

API Function

Function

API

API Function

Function

Function for

for

for Buzzer

Buzzer

BEEP_API

BEEP_API int

int

int beep_ctrl

beep_ctrl

beep_ctrl (char

(char

(char *name,

*name,

*name, int

int

int onoff);

onoff);

Source

Source beeplib.h

Function

Function control buzzer to make sound or keep silent

Parameters

name (buzzer name, normally there is only one buzzer which is called “ beep ” )

on /off (0 for off, 1 for on)

Returned

Returned Value

Value

Value 0 for success , otherwise failure

Example

Example beep_ctrl ("beep", 1); beep_ctrl ("beep", 0);

Table

Table 2-4

2-4

2-4 Serial

Serial

Serial Interface

Interface

Interface API

API

API Function

Function

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API

API Function

Function

Function for

for

for Serial

Serial

Serial Interface

Interface

int

int OpenDev(char

OpenDev(char

OpenDev(char *Dev)

*Dev)

*Dev) ;

;

Source

Source com_example.c

Function

Function Enable serial devices and acquire descriptors

Parameter

Parameter dev ( character string of serial devices, e.g. “ /dev/ttySAC0 ” )

Returned

Returned Value

Value

Value Value more than 0 is a serial file descriptor, less than 0 stands for failure

void

void set_speed(int

set_speed(int

set_speed(int fd,

fd,

fd, int

int

int speed)

speed)

speed) ;

;

Source

Source com_example.c

Function

Function Configure bitrate of serial interfaces

Parameter

fd (serial file descriptor)

speed (bitrate, e.g. 15200)

Returned

Returned Value

Value

Value None

int

int set_Parity

set_Parity

set_Parity (int

(int

(int fd,int

fd,int

fd,int databits,int

databits,int

databits,int stopbits,int

stopbits,int

stopbits,int parity,int

parity,int

parity,int flowctrl)

flowctrl)

flowctrl) ;

;

Source

Source com_example.c

Function

Function Configure serial interface data bits, stop bits, parity check and data flow control

Parameters

fd (serial file descriptor)

databits (length of data bits)

stopbits (length of stop bits)

parity (check type, N for no check, O for odd check, E for even check)

flowctrl (switch of hardware data follow control, 1 for enable, 0 for disable)

Returned

Returned Value

Value

Value 0 for success , otherwise failure

size_t

size_t read(int

read(int

read(int fd,

fd,

fd, const

const

const void

void

void *buf,

*buf,

*buf, size_t

size_t

size_t nbytes)

nbytes)

nbytes) ;

;

Source

Source unistd.h

Function

Function C alled by system to acquire data received on serial interface

Parameters

fd (serial file descriptor)

B uf (pointer to the received data)

nbytes (data length about to be read, Byte)

Returned

Returned Value

Value

Value Value less than 0 stands for error, more than 0 stands for received data length (Byte)

size_t

size_t write(int

write(int

write(int fd,

fd,

fd, const

const

const void

void

void *buf,

*buf,

*buf, size_t

size_t

size_t nbytes)

nbytes)

nbytes) ;

;

Source

Source unistd.h

Function

Function Called by system to send data through serial interfaces

Parameters

fd (serial file descriptor)

buf (pointer to the data about to be sent)

n bytes (length of data about to be sent, Byte)

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API

API Function

Function

Function for

for

for Serial

Serial

Serial Interface

Interface

int

int OpenDev(char

OpenDev(char

OpenDev(char *Dev)

*Dev)

*Dev) ;

;

Returned

Returned Value

Value

Value Value less than 0 stands for error, more than 0 stands for data length being sent (Byte)

int

int close(int

close(int

close(int fd)

fd)

fd) ;

;

Source

Source unistd.h

Function

Function Called by system to disable serial interface

Parameters

Parameters fd (serial file descriptor)

Returned

Returned Value

Value

Value 0 for success, less than 0 stands for error

Table

Table 2-5

2-5

2-5 GPIO

GPIO

GPIO API

API

API Function

Function

API

API Function

Function

Function for

for

for GPIO

GPIO

GPIO_API

GPIO_API int

int

int init_gpio

init_gpio

init_gpio (void);

(void);

Source

Source gpiolib.h

Function

Function Initializing GPIO

Parameters

Parameters None

Returned

Returned Value

Value

Value 0 for success, otherwise failure

GPIO_API

GPIO_API int

int

int remove_gpio

remove_gpio

remove_gpio (void);

(void);

Source

Source gpiolib.h

Function

Function Release gpio

Parameters

Parameters None

Returned

Returned Value

Value

Value 0 for success, otherwise failure

GPIO_API

GPIO_API int

int

int set_gpio_output

set_gpio_output

set_gpio_output (char

(char

(char *pin,

*pin,

*pin, int

int

int value);

value);

Source

Source gpiolib.h

Function

Function Provide a logic level output on GPIO interfaces

Parameters

p in (GPIO pin name, e.g. “ pb29 ”

v alue (0 for low level, 1 for high level)

Returned

Returned Value

Value

Value 0 for success, otherwise failure

GPIO_API

GPIO_API int

int

int get_gpio_input

get_gpio_input

get_gpio_input (char

(char

(char *pin);

*pin);

Source

Source unistd.h

Function

Function Acquire the logic level input on GPIO interfaces

Parameters

Parameters p in (GPIO pin name, e.g. “ pb29 ”

Returned

Returned Value

Value

Value 0 or 1 for input level, other values for input failure

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Table

Table 2-6

2-6

2-6 PWM

PWM

PWM API

API

API Function

Function

API

API Function

Function

Function for

for

for PWM

PWM

PWM_API

PWM_API int

int

int pwm_ctrl

pwm_ctrl

pwm_ctrl (char

(char

(char *name,

*name,

*name, int

int

int ratio);

ratio);

Source

Source pwmlib.h

Function

Function Control the duty cycle of PWM output

Parameters

name (pin name, e.g. “ PD26 ” )

r atio (integer between 0 ～255, duty cycle =ratio / 256)

Returned

Returned Value

Value

Value 0 for success, otherwise error

2.4

2.4 Starting

Starting

Starting Testing

Testing

This section will show you how to use the example applications installed by default in the

system to accomplish the testing of SBC6845

’

s functions. After you finish the

configurations mentioned in 2.1

2.1

2.1 System

System

System Boot-up

Boot-up

Boot-up , you can run the applications as

shown in the following contents.

2.4.2

2.4.2 Touch-Screen

Touch-Screen

Touch-Screen Testing

Testing

1

1）Execute the following instruction to run touch-screen calibration program;

[root@SBC6845:/]#

[root@SBC6845:/]# ts_calibrate

ts_calibrate

Press the symbol “ + ” shown on touch-screen for 5 times to accomplish

screen calibration.

2

2）Execute the following instruction to test touch-screen;

[root@SBC6845:/]#

[root@SBC6845:/]# ts_test

ts_test

Select Drag

Drag

Drag or Draw

Draw

Draw to test dragging and drawing functions.

Press Ctrl+C

Ctrl+C

Ctrl+C on your PC

’

s keyboard to exit the example application.

2.4.3

2.4.3 LCD

LCD

LCD Color

Color

Color Testing

Testing

By executing the following instruction, LCD will display each of three-primary color

respectively and then show them all together on the screen.

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[root@SBC6845:/]#

[root@SBC6845:/]# /home/app/lcd

/home/app/lcd

2.4.4

2.4.4 LCD

LCD

LCD Backlight

Backlight

Backlight Testing

Testing

1

1）Execute the following instruction to adjust backlight brightness; the

brightness value should be an integer between 1~10;

[root@SBC6845:/]#

[root@SBC6845:/]# bl_adjust

bl_adjust

bl_adjust SET

SET

SET 5

5

2

2）Execute the following instruction to turn off backlight;

[root@SBC6845:/]#

[root@SBC6845:/]# bl_adjust

bl_adjust

bl_adjust OFF

OFF

3

3）Execute the following instruction to turn on backlight;

[root@SBC6845:/]#

[root@SBC6845:/]# bl_adjust

bl_adjust

bl_adjust ON

ON

2.4.5

2.4.5 Ethernet

Ethernet

Ethernet Testing

Testing

1

1）Execute the following instruction to set an IP address for SBC6845;

[root@SBC6845:/]#

[root@SBC6845:/]# ifconfig

ifconfig

ifconfig eth0

eth0

eth0 192.192.192.200

192.192.192.200

2

2）Execute the following instruction to test network communication;

[root@SBC6845:/]#

[root@SBC6845:/]# ping

ping

ping 192.192.192.105

192.192.192.105

Note:

The IP in the above instructions are just examples. Please set IP address according to

your network configurations and ensure that SBC6845 and your PC are set in the same

network segment.

The table shown below is the testing information in HyperTerminal window.

Table

Table 2-7

2-7

2-7 Ethernet

Ethernet

Ethernet Testing

Testing

PING 192.192.192.105 (192.192.192.105): 56 data bytes

64 bytes from 192.192.192.105: icmp_seq=0 ttl=64 time=0.5 ms

64 bytes from 192.192.192.105: icmp_seq=1 ttl=64 time=0.3 ms

64 bytes from 192.192.192.105: icmp_seq=2 ttl=64 time=0.3 ms

64 bytes from 192.192.192.105: icmp_seq=3 ttl=64 time=0.3 ms

64 bytes from 192.192.192.105: icmp_seq=4 ttl=64 time=0.3 ms

64 bytes from 192.192.192.105: icmp_seq=5 ttl=64 time=0.3 ms

64 bytes from 192.192.192.105: icmp_seq=6 ttl=64 time=0.3 ms

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--- 192.192.192.105 ping statistics ---

7 packets transmitted, 7 packets received, 0% packet loss

round-trip min/avg/max = 0.3/0.3/0.5 ms

~ $

Press Ctrl+C

Ctrl+C

Ctrl+C on your PC

’

s keyboard to exit Ethernet testing.

2.4.6

2.4.6 Serial

Serial

Serial Interface

Interface

Interface Testing

Testing

SBC6845 has 5 serial interfaces - ttySAC0, ttySAC1, ttySAC2, ttySAC3 and ttySAC6.

ttySAC2 is defined as RS-485 and ttySAC6 is used for debugging. Please execute the

following instruction to test serial interfaces.

[root@SBC6845:/home/app]#

[root@SBC6845:/home/app]# ./com

./com

./com -d

-d

-d /dev/ttySAC1

/dev/ttySAC1

/dev/ttySAC1 -s

-s

-s 1234567890

1234567890

1234567890 -b

-b

-b 115200

115200

115200 –

–

– f

f

Table

Table 2-8

2-8

2-8 Command

Command

Command Parameters

Parameters

Parameters Descriptions

Descriptions

-d Serial device node used to specify serial interfaces

-s Character string to be sent

-b Bitrate

-f Enable hardware data flow control

Note:

ttySAC1 requires hardware data flow control.

The internal pull-up resistor of serial interface is enabled by default by the driver in order

to ensure the quality and reliability of communication.

Please be aware of the SPACEs in the instruction; Missing of any space would cause

failure in executing instructions.

2.4.7

2.4.7 CAN

CAN

CAN Bus

Bus

Bus Testing

Testing

SBC6845 integrates only one CAN bus, and therefore it needs to work with another

SBC6845 or a CAN-enabled device to test the data transfer over CAN bus. The figure

shown below illustrates the connections between SBC6845 and a CAN-enabled device.

Please

Please be

be

be aware

aware

aware that

that

that jumper

jumper

jumper JP13

JP13

JP13 is

is

is shorted.

shorted.

Embest Technology

15

Figure

Figure 2-3

2-3

2-3 CAN Bus Connections

Please execute the following instructions;

[root@SBC6845:/]#

[root@SBC6845:/]# cd

cd

cd /home/app/can/

/home/app/can/

[root@SBC6845:/home/app/can]#

[root@SBC6845:/home/app/can]# ./can_test_125k

./can_test_125k

./can_test_125k /dev/can0

/dev/can0

The HypterTerminal will display the testing information as shown in the following table.

Table

Table 2-9

2-9

2-9 CAN

CAN

CAN Testing

Testing

Testing Information

Information

/dev/can0 Work Rate: 125000bps

/dev/can0 work on normal mode.

Press "\q" to quit!

Input the message and press Enter to send!

The frame id=1...2031, and eid=id*2+1

CanTest> TestData

CanTest>

Header: id=1 srr=0 ide=0 eid=0 rtr=0 rb1=0 rb0=0 dlc=8

RECV: "TestData"

Press Ctrl+C

Ctrl+C

Ctrl+C on your PC

’

s keyboard to exit testing.

2.4.8

2.4.8 RS485

RS485

RS485 Bus

Bus

Bus Testing

Testing

RS485 interface is associated to the device /dev/ttySAC2. Similar to CAN bus testing,

two RS485-enabled devices are required to accomplish the testing as shown below.

Embest SBC6845 User manual

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