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sigmadelta.rst

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Sigma-delta Modulation

Introduction

{IDF_TARGET_NAME} has a second-order sigma-delta modulation module. This driver configures the channels of the sigma-delta module.

Functionality Overview

There are eight independent sigma-delta modulation channels identified with :cppsigmadelta_channel_t. Each channel is capable to output the binary, hardware generated signal with the sigma-delta modulation.

Selected channel should be set up by providing configuration parameters in :cppsigmadelta_config_t and then applying this configuration with :cppsigmadelta_config.

Another option is to call individual functions, that will configure all required parameters one by one:

  • Prescaler of the sigma-delta generator - :cppsigmadelta_set_prescale
  • Duty of the output signal - :cppsigmadelta_set_duty
  • GPIO pin to output modulated signal - :cppsigmadelta_set_pin

The range of the 'duty' input parameter of :cppsigmadelta_set_duty is from -128 to 127 (eight bit signed integer). If zero value is set, then the output signal's duty will be about 50%, see description of :cppsigmadelta_set_duty.

Application Example

Sigma-delta Modulation example: peripherals/sigmadelta.

API Reference

inc/sigmadelta.inc

inc/sigmadelta_types.inc