Example io demo UPDATE 2019

TODO: {{#todo:SEOKWREV (01.03.14-16:47->JG+);(01.03.14-17:35->MD+);(04.07.14-09:45->BS+);(04.09.14-16:15->BS+)|Jgreene|oe 4,oe 5,jg,md,SEOKWREV,ky,bs}}

This demo covers basic GPIO usage for the IPAC single board computer, and 150 and 200 series carrier boards. This demo first cover GPIO manipulation through the Linux terminal and then demonstrates gpio usage in a C program using an io example program.

Hardware Requirements

To use the io demo program you will need the following target hardware.

• An EMAC 150 series carrier board with a compatible SoM
  

OR

• An EMAC 200 series carrier board with a compatible SoM
  

OR

• an IPAC
  

AND

• additional components to establish to serial and Ethernet connections for your target hardware
  

Software Requirments

These tools should already be installed if you installed the EMAC SDK using the automatic installer.

• EMAC OE 5.X SDK
• EMAC Qt Creator
• GNU make
• CMake

Setup

If you haven't already, please review the EMAC_OE_SDK "getting started" page. EMAC_OE_SDK will need to be installed and serial and network connections will need to be established between the developer machine and the target device.See the Serial Connections or Network Connections page for more information on how to connect to the target EMAC product using a serial port or Ethernet connection.

GPIO manipulation through Linux Terminal

GPIOs can be manipulated directly through the target devices serial terminal.

GPIO manipulation in C

A more common manipulation of GPIOs is through a C program. The following example will demonstrated GPIO manipulation using the Libgpiod libary.

1. In a terminal, navigate to the base directory of the project.

   
   

   
   

   NOTE

   If the target board being used is x86, then change all occurrences of arm in the following sections below to x86.

2. Create a build directory for cross compiling.

   developer@ldc:~/projects/hello_emac# mkdir hello_emac-build-arm

3. Change directories into the newly created directory.

   developer@ldc:~/projects/hello_emac# cd hello_emac-build-arm

4. Run cmake using the target architecture.

   developer@ldc:~/projects/hello_emac/hello_emac-build-arm# cmake .. -DARCH:STRING=arm

5. Compile the code using make.

   developer@ldc:~/projects/hello_emac/hello_emac-build-arm# make

   The make command creates the target executable in the hello_emac-build-arm directory.

6. Now copy the executable to the target board. For information on copying the executable file, see the Transferring Files section.

Transferring Files SDK Install