rpi_pwm: Provide R with access to PWM

In mnr/rpigpior: Provides R with Access to the Raspberry Pi

Provide R with access to PWM

Description

Provides the R programming language with access to Raspberry Pi hardware Pulse Width Modulation (PWM)

Usage

rpi_pwm(
  pin_number = 12,
  pwm_period = 50000,
  pwm_dutycycle = 25000,
  pwm_debug = FALSE
)

Arguments

pin_number	One or two pins for hardware PWM. Must be 12, 32, 33, or 35. If two pins are selected, they must be one of these combinations: (12,33), (32,33), (12,35), or (32,35)
pwm_period	The length of a cycle. aka Frequency. 15 or greater, less than 1000000
pwm_dutycycle	The amount of time a cycle is on.
pwm_debug	If TRUE, checks Raspberry Pi OS settings for PWM and provides diagnostics

Details

Only two PWM lines are available on the Raspberry Pi - pwm0 and pwm1. Although it is possible to create software PWM, this isn't advised due to latency of linux and R. It might be helpful to read the article on 'rpi_pwm()' located at the [rpigpior website](https://mnr.github.io/rpigpior/articles/rpi_pwm.html).

Value

void 'rpi_pwm()' provides extensive error checking. Possible errors include:

• Invalid PWM pin: Hardware PWM is only supplied to pins 12, 32, 33, or 35.

• Invalid PWM pin combination: The combination of pins both select PWM0 or PWM1

• PWM not enabled: This PWM channel is not enabled

• (see https://mnr.github.io/rpigpior/articles/rpi_pwm.html for fixing errors)

Examples

rpi_pwm(12) # provides 50% PWM to pin 12 (PWM0)

#' # provides 20% PWM to pin 12 (PWM0) and pin 33 (PWM1)
rpi_pwm(c(12,33), pwm_period = 50000, pwm_dutycycle = 10000)

mnr/rpigpior documentation built on May 3, 2024, 12:14 a.m.