PWM Generator

PWM Generator
Status	Unstable/Broken
menuconfig	I/O->PWM Generator
Pinning	yes
Ecmd	yes
Depends on	ECMD
Requires	-
Code	https://github.com/ethersex/ethersex/tree/master/hardware/pwm

Pulse wide modulator generator with up to 3 channels.

This module uses the avr timers to generate the pwm signals, so for every channel a timer is necessary. It depends on the hardware and other modules, if three timers are available for the the three channels.

To get background infos you can have a look at this tutorial (in german): [AVR-Tutorial: PWM]

Status: Basic modul works - tested and used 2012-05-25

Connection

Every channels requieres a port, but since the timers are used, the ports have a predefined assignment - depending on the mcrocontroller.

Nevertheless you have to do some pin definition. Here the version for the AtMega32:

ifdef(`conf_CH_A_PWM_GENERAL', `dnl
 pin(CHANNEL_A_PWM, PD5, OUTPUT)
')
ifdef(`conf_CH_B_PWM_GENERAL', `dnl
 pin(CHANNEL_B_PWM, PD4, OUTPUT)
')
ifdef(`conf_CH_C_PWM_GENERAL', `dnl
  # error 3 Channel pwm unsupported.
')

You can also use the script add-hardware (in folder scripts) to generate a board-layout for your current configuration. I don't know the current status of the script - so it is possible, that not every features is supported.

Optional components

PWM Wave

Output of wave files

PWM Melody

Melody generator

PWM Servo

Control a servo motor