Running "Raspbian" on Model_B Raspberry Pi (Revision 2) w/ ribbon expanding the GPIO out onto a Breadboard as shown in the following image.
Here is a close up of the GPIO setup on the breadboard and the connection of my probe. My probe is connected to the Green wire which is connected to pin 7 (CE1). My ground is obviously connected to ground which is the yellow wire.
I'm using GPIO pin 7 (CE1) as an output which I have my probe connected to and my ground is connected to the ground pin. I've set probe on 10:1 setting.
My program reflects the example for the "C" "wiringPi library" program located here . You will need to scroll down as the example is located towards the end. I'm also attaching a image below of my program.
I'm unsure what the (if) statement is doing but as you can see i'm setting the pinMode to (7,OUTPUT) and using a (while) loop to toggle pin on and off as fast as possible. I'm hoping to achieve a digital square wave from this program to view on my oscilloscope. However, i'm getting a bad signal on the screen as you can see below.
THE PROBLEM I'M HAVING:
Can someone help me troubleshoot my setup so I can get a digital square wave to display. The link I attached above gives an article on how they set their test bench up. The even show the signal that was displayed on the oscilloscope. However, for some reason I cannot replicate their results. Below is an article for the spec sheet of the GPIO. Again my board is revision 2.
SPEC SHEET FOR THE GPIO:
PROBLEM HAS BEEN RESOLVED:
Thanks to K-Sid's comment below and the wonderful link I have fixed the issue. I'm posting the new image of the signal being analyzed. It's showing a frequency of 4.3MHz which is around what it should be.