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Mitch Bradley
2021-06-24 10:48:50 -10:00
parent dedd84702a
commit 60d5c294c0
2 changed files with 88 additions and 0 deletions
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57
Grbl_Esp32/src/Pins/Ledc.cpp Normal file
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#include "Ledc.h"
/*
Ledc.cpp
This is a driver for the ESP32 LEDC controller that is similar
to the Arduino HAL driver for LEDC. It differs from the Arduino
driver by being able to handle output pin inversion in hardware,
and by having the ledcSetDuty function in IRAM so it is safe
to call it from ISRs.
Part of Grbl_ESP32
2021 - Mitch Bradley
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Grbl 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
#include <soc/ledc_struct.h>
#include <driver/ledc.h>
extern "C" void __pinMode(uint8_t pin, uint8_t mode);
void ledcInit(Pin& pin, uint8_t chan, double freq, uint8_t bit_num) {
ledcSetup(chan, freq, bit_num); // setup the channel
auto nativePin = pin.getNative(Pin::Capabilities::PWM);
// This is equivalent to ledcAttachPin with the addition of
// using the hardware inversion function in the GPIO matrix.
// We use that to apply the active low function in hardware.
__pinMode(nativePin, OUTPUT);
uint8_t function = ((chan / 8) ? LEDC_LS_SIG_OUT0_IDX : LEDC_HS_SIG_OUT0_IDX) + (chan % 8);
bool isActiveLow = pin.getAttr().has(Pin::Attr::ActiveLow);
pinMatrixOutAttach(nativePin, function, isActiveLow, false);
}
void IRAM_ATTR ledcSetDuty(uint8_t chan, uint32_t duty) {
uint8_t g = chan >> 3, c = chan & 7;
bool on = duty != 0;
// This is like ledcWrite, but it is called from an ISR
// and ledcWrite uses RTOS features not compatible with ISRs
// Also, ledcWrite infers enable from duty, which is incorrect
// for use with RcServo which wants the
LEDC.channel_group[g].channel[c].duty.duty = duty << 4;
LEDC.channel_group[g].channel[c].conf0.sig_out_en = on;
LEDC.channel_group[g].channel[c].conf1.duty_start = on;
}

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Grbl_Esp32/src/Pins/Ledc.h Normal file
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#pragma once
/*
Ledc.h
This is a driver for the ESP32 LEDC controller that is similar
to the Arduino HAL driver for LEDC. It differs from the Arduino
driver by being able to handle output pin inversion in hardware,
and by having the ledcSetDuty function in IRAM so it is safe
to call it from ISRs.
Part of Grbl_ESP32
2021 - Mitch Bradley
Grbl is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Grbl 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with Grbl. If not, see <http://www.gnu.org/licenses/>.
*/
#include "../Pin.h"
extern void ledcInit(Pin& pin, uint8_t chan, double freq, uint8_t bit_num);
extern void ledcSetDuty(uint8_t chan, uint32_t duty);