mirror of
https://github.com/esp8266/Arduino.git
synced 2025-04-21 10:26:06 +03:00
afcbcd5cc9
Provides a simple interface to attach/detach pins to the sigma-delta generator, and get/set the 2 parameters prescaler & target. Working example that fades the onboard LED is provided. Code and sample by @stefaandesmet2003.
73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
/*
|
|
sigma_delta.h - esp8266 sigma-delta source
|
|
|
|
Copyright (c) 2014 Ivan Grokhotkov. All rights reserved.
|
|
This file is part of the esp8266 core for Arduino environment.
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/*
|
|
/******************************************************************************
|
|
* Info Sigma delta module
|
|
|
|
This module controls the esp8266 internal sigma delta source
|
|
Each pin can be connected to the sigma delta source
|
|
The target duty and frequency can be modified via the register GPIO_SIGMA_DELTA
|
|
|
|
THE TARGET FREQUENCY IS DEFINED AS:
|
|
|
|
FREQ = 80,000,000/prescaler * target /256 HZ, 0<target<128
|
|
FREQ = 80,000,000/prescaler * (256-target) /256 HZ, 128<target<256
|
|
target: duty ,0-255
|
|
prescaler: clk_div,0-255
|
|
so the target and prescale will both affect the freq.
|
|
|
|
Usage :
|
|
1. sigma_delta_enable() : activate the sigma delta source with default prescalar (0) & target (0)
|
|
2. sigma_delta_attachPin(pin), any pin 0..15, TBC if gpio16 supports sigma-delta source
|
|
This will set the pin to NORMAL output mode (pinMode(pin,OUTPUT))
|
|
3. sigma_delta_setPrescaler(uint8_t) : reduce the output frequencies
|
|
4. sigma_delta_setTarget(uint8_t) : set the output signal duty cycle, duty cycle = target/256
|
|
|
|
5. sigma_delta_detachPin(pin), this will revert the pin to NORMAL output mode & GPIO source.
|
|
The sigma delta source remains on until :
|
|
6. sigma_delta_disable()
|
|
|
|
*******************************************************************************/
|
|
|
|
#ifndef SIGMA_DELTA_H
|
|
#define SIGMA_DELTA_H
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
void sigma_delta_enable(void);
|
|
void sigma_delta_disable(void);
|
|
void sigma_delta_attachPin(uint8_t pin);
|
|
void sigma_delta_detachPin(uint8_t pin);
|
|
bool sigma_delta_isPinAttached(uint8_t pin);
|
|
uint8_t sigma_delta_getTarget(void);
|
|
void sigma_delta_setTarget(uint8_t target);
|
|
uint8_t sigma_delta_getPrescaler(void);
|
|
void sigma_delta_setPrescaler(uint8_t prescaler);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif//SIGMA_DELTA_H
|