PWM Generator

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Revision as of 22:41, 24 May 2012 by Tkaltenbrunner (talk | contribs) (Connection)
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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 thre 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]


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.