+ -
+
- Home +
- Experiment control +
- Pin debugging +
- Help +
This test page gives control over the BBB's pins. @@ -60,12 +117,12 @@
To see the pin out diagram of the BBB, click here.
+To see the pin out diagram of the BBB, click here.
- To 'unexport' a pin means to disable it. Apart from the obvious + To export/unexport a pin means to enable/disable it. Apart from the obvious use case, sometimes this can be required if you use two PWM channels that share the same frequency base.
@@ -76,13 +133,15 @@The frequency must be a decimal number greater than 0.
- The BBB has up to 8 PWM channels, with 6 having enhanced - resolution. + The duty cycle describes the proportion of off/on time per period. + This number is specified as a ratio, with values ranging from 0 to 1.
- However, those 6 are paired, meaning that each pair must share the - same frequency (although the duty cycle can be different). + The polarity determines if the duty represents the 'active + high' or 'active low' portion. By default, the duty cycle + represents the 'active high' portion.