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Moxa EM-1220-LX [47/57] How to use the gpio
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EM-1240-LX User’s Manual EM-1240-LX Device API
int set_gpio_mode(unsigned int pio, int mode)
--to configure GPIO ports to be DI ports or DO ports.
Input:
unsigned int pio - GPIO port number
Each GPIO point will be regarded as a port. We support from Port 0 to Port 9 for the EM-1240,
and from Port 0 to Port 7 for the EM-1220.
int mode
1 represents DI.
0 represents DO.
Output:
1 represents high.
0 represents low.
Return:
< 0 is wrong.
= 0 is correct.
int set_gpio_data(unsigned int pio, int data)
--to check the current status of the GPIO, either high or low voltage, used when the GPIO points
are configured as DO.
Input:
unsigned int pio - GPIO port number
Each GPIO point will be regarded as a port. We support from Port 0 to Port 9 for the EM-1240,
and from Port 0 to Port 7 for the EM-1220.
int data
1 represents high.
0 represents low.
Output:
1 represents high.
0 represents low.
Return:
< 0 is wrong.
= 0 is correct.
How to use the GPIO
1. The device driver must be loaded.
> insmod gpio.ko
2. The program must include <moxadevice.h> and link to libmoxalib.a. Here is an example:
> arm-elf-gcc –wl, -elf2flt –o TestGpioAp TestGpioAp.c –lmoxalib –lpthread
5-4
Содержание
- Em 1240 lx user s manual 1
- Fifth edition february 2009 1
- Www moxa com product 1
- Copyright notice 2
- Disclaimer 2
- Em 1240 lx user s manual 2
- Technical support contact information www moxa com support 2
- Trademarks 2
- Table of contents 3
- Introduction 5
- Overview 6
- Package checklist 6
- Product features 6
- Hardware specifications 7
- Product specifications 7
- Software specifications 8
- Appearance 9
- Em 1240 embedded module development kit 9
- Em 1240 lx user s manual introduction 9
- Hardware block diagram 9
- Em 1240 development kit 10
- Em 1240 embedded module 10
- Em 1240 lx user s manual introduction 10
- Dimensions 11
- Installing the em 1240 lx 11
- Led indicators 12
- Wiring requirements 12
- Connecting data transmission cables 13
- Connecting the power 13
- Connecting to the network 13
- Grounding the em 1240 lx 13
- Connecting to a serial device 14
- Serial console port 14
- Additional functions 15
- Internal sd socket 15
- Reset button 15
- Real time clock 16
- Getting started 17
- Connecting the em 1240 lx to a pc 18
- Console port 18
- Powering on the em 1240 lx 18
- Telnet 19
- Configuring the ethernet interface 20
- Developing your applications 22
- Installing a secure digital sd memory card 22
- Compiling hello c 23
- Installing the em 1240 lx tool chain 23
- Uploading hello to the em 1240 lx 24
- Running hello on the em 1240 lx 25
- Make file example code 26
- Software package 27
- Em 1240 lx software architecture 28
- Journaling flash file system jffs2 29
- Em 1240 lx software package 30
- Configuring the em 1240 lx 32
- Enabling and disabling daemons 33
- How to enable disable etc inittab www server 33
- How to enable disable telnet ftp server 33
- How to enable network time protocol 33
- How to update the system time periodically with network time protocol 33
- Adding a web page 34
- Iptables 34
- Observe and erase chain rules 36
- Append or delete rules 37
- Define policy for chain rules 37
- Enabling nat at bootup 38
- Nat example 38
- Configuring dial in dial out service 39
- Configuring pppoe 39
- Connect using a modem 39
- Dial in service 39
- Dial out service 39
- Direct cable connection 39
- Dynamic driver module load unload 40
- How to mount a remote nfs server 40
- Upgrading the kernel 41
- Upgrading the root file system user directory 42
- Autostarting user applications on bootup 43
- Checking the kernel and root file system versions 43
- Loading factory defaults 43
- Em 1240 lx device api 44
- Buzzer 45
- Rtc real time clock 45
- Uart interface 45
- Api list 46
- Moxa gpio api 46
- How to use the gpio 47
- Gpio library source code 48
- Limits 48
- A system commands 52
- Editor 52
- File manager 52
- System commands 52
- Μclinux normal command utility collection 52
- Moxa special utilities 53
- Network 53
- Process 53
- B snmp agent with mib ii rs 232 like group 54
- Snmp agent with mib ii rs 232 like group 54
- C em 1240 lx faq 57
- Em 1240 lx faq 57
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