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--- gpio_control_from_command_line [2017/01/22 13:54] – walkeradmin
+++ gpio_control_from_command_line [2017/01/22 16:06] – [Install WiringPi] walkeradmin
@@ Line 42: / Line 42: @@
 Raspberry Pi ONLY.
 </file>
+\\
+\\
+Another test, and something you can use a lot to check the status of the gpio is the </color red>readall</color> switch.
+\\
+\\
+    gpio readall
+\\
+This will give an output similar to below (This output is from a Pi Zero v1.3)
+\\
+\\
+<file>
+ +-----+-----+---------+------+---+-Pi Zero--+---+------+---------+-----+-----+
+ | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
+ +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
+ |     |     |    3.3v |      |   |  1 || 2  |   |      | 5v      |     |     |
+ |   2 |   8 |   SDA.1 |   IN | 1 |  3 || 4  |   |      | 5V      |     |     |
+ |   3 |   9 |   SCL.1 |   IN | 1 |  5 || 6  |   |      | 0v      |     |     |
+ |   4 |   7 | GPIO. 7 |   IN | 1 |  7 || 8  | 1 | ALT0 | TxD     | 15  | 14  |
+ |     |     |      0v |      |   |  9 || 10 | 1 | ALT0 | RxD     | 16  | 15  |
+ |  17 |   0 | GPIO. 0 |   IN | 0 | 11 || 12 | 0 | OUT  | GPIO. 1 | 1   | 18  |
+ |  27 |   2 | GPIO. 2 |   IN | 0 | 13 || 14 |   |      | 0v      |     |     |
+ |  22 |   3 | GPIO. 3 |   IN | 0 | 15 || 16 | 0 | OUT  | GPIO. 4 | 4   | 23  |
+ |     |     |    3.3v |      |   | 17 || 18 | 1 | OUT  | GPIO. 5 | 5   | 24  |
+ |  10 |  12 |    MOSI |   IN | 0 | 19 || 20 |   |      | 0v      |     |     |
+ |   9 |  13 |    MISO |   IN | 0 | 21 || 22 | 0 | OUT  | GPIO. 6 | 6   | 25  |
+ |  11 |  14 |    SCLK |   IN | 0 | 23 || 24 | 1 | IN   | CE0     | 10  | 8   |
+ |     |     |      0v |      |   | 25 || 26 | 1 | IN   | CE1     | 11  | 7   |
+ |   0 |  30 |   SDA.0 |   IN | 1 | 27 || 28 | 1 | IN   | SCL.0   | 31  | 1   |
+ |   5 |  21 | GPIO.21 |  OUT | 1 | 29 || 30 |   |      | 0v      |     |     |
+ |   6 |  22 | GPIO.22 |  OUT | 0 | 31 || 32 | 0 | IN   | GPIO.26 | 26  | 12  |
+ |  13 |  23 | GPIO.23 |  OUT | 1 | 33 || 34 |   |      | 0v      |     |     |
+ |  19 |  24 | GPIO.24 |  OUT | 0 | 35 || 36 | 0 | OUT  | GPIO.27 | 27  | 16  |
+ |  26 |  25 | GPIO.25 |  OUT | 0 | 37 || 38 | 0 | OUT  | GPIO.28 | 28  | 20  |
+ |     |     |      0v |      |   | 39 || 40 | 1 | OUT  | GPIO.29 | 29  | 21  |
+ +-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
+ | BCM | wPi |   Name  | Mode | V | Physical | V | Mode | Name    | wPi | BCM |
+ +-----+-----+---------+------+---+-Pi Zero--+---+------+---------+-----+-----+
+</file>
+\\
+It can be seen that this Pi has GPIO set to OUT and some to IN. I am using the Pi as a clock, so these are the lines going to my LED display.
+\\
+\\
+----
+==== Using gpio command ====
+\\
+\\
+Before looking at the commands, there is a switch I want to talk about, this is <color red>-g</color>. If you use the -g switch you are operating on BCM numbers, not PIN numbers. I always use BCM numbers, but some people prefer pin numbers.
+\\
+\\
+To set the function of the GPIO pin, use <color red>gpio -g mode</color>
+\\
+\\
+    using BCM number
+    gpio -g mode 18 out - Sets GPIO18 to OUTput mode (GPIO18 is physical pin 12)
+    using pin instead of bcm
+    gpio mode 12 out - Sets GPIO18 to OUTput mode (GPIO18 is physical pin 12)
+    Modes are In, Out, PWM, Up, Down and Tri.
+\\
+\\
+Set GPIO pin to 1 or 0
+\\
+\\
+    gpio -g write 18 0 - sets GPIO18 to a zero.
+    gpio -g write 18 1 - sets GPIO18 to a one.
+\\
+\\
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