A board-level description of the 40 GPIO pins found on a Raspberry Pi. This is different than wiring pi or BCM numbering schemes. Instead, this reflects the function of pins by their physical location on the board.
Format
rpi_pin_desc
A data frame with 40 rows and two columns:
description. Primary function of the pin
secondary. Secondary function of the pin
valid_PWM_pair_1, valid_PWM_pair_2. Used by rpi_pwm() to determine valid PWM pins and channel combinations.
PWM_channel. Unambiguously relates the PWM channel to each board pin