arduino-esp32/cores/esp32/esp32-hal-sigmadelta.c
Me No Dev c827bb4177
CPU and APB Frequency support (#2220)
* Add support to HAL for APB frequencies different than 80MHz

* Add support for CPU frequencies in the IDE board menu

* Switch to fast set_config

* Add method to uart so debug can be reassigned after apb frequency switch

* Return real APB frequency
2018-12-20 01:57:32 +01:00

94 lines
2.5 KiB
C

// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "esp32-hal.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/semphr.h"
#include "rom/ets_sys.h"
#include "esp32-hal-matrix.h"
#include "soc/gpio_sd_reg.h"
#include "soc/gpio_sd_struct.h"
#if CONFIG_DISABLE_HAL_LOCKS
#define SD_MUTEX_LOCK()
#define SD_MUTEX_UNLOCK()
#else
#define SD_MUTEX_LOCK() do {} while (xSemaphoreTake(_sd_sys_lock, portMAX_DELAY) != pdPASS)
#define SD_MUTEX_UNLOCK() xSemaphoreGive(_sd_sys_lock)
xSemaphoreHandle _sd_sys_lock;
#endif
uint32_t sigmaDeltaSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-312500
{
if(channel > 7) {
return 0;
}
#if !CONFIG_DISABLE_HAL_LOCKS
static bool tHasStarted = false;
if(!tHasStarted) {
tHasStarted = true;
_sd_sys_lock = xSemaphoreCreateMutex();
}
#endif
uint32_t apb_freq = getApbFrequency();
uint32_t prescale = (apb_freq/(freq*256)) - 1;
if(prescale > 0xFF) {
prescale = 0xFF;
}
SD_MUTEX_LOCK();
SIGMADELTA.channel[channel].prescale = prescale;
SIGMADELTA.cg.clk_en = 0;
SIGMADELTA.cg.clk_en = 1;
SD_MUTEX_UNLOCK();
return apb_freq/((prescale + 1) * 256);
}
void sigmaDeltaWrite(uint8_t channel, uint8_t duty) //chan 0-7 duty 8 bit
{
if(channel > 7) {
return;
}
duty -= 128;
SD_MUTEX_LOCK();
SIGMADELTA.channel[channel].duty = duty;
SD_MUTEX_UNLOCK();
}
uint8_t sigmaDeltaRead(uint8_t channel) //chan 0-7
{
if(channel > 7) {
return 0;
}
SD_MUTEX_LOCK();
uint8_t duty = SIGMADELTA.channel[channel].duty + 128;
SD_MUTEX_UNLOCK();
return duty;
}
void sigmaDeltaAttachPin(uint8_t pin, uint8_t channel) //channel 0-7
{
if(channel > 7) {
return;
}
pinMode(pin, OUTPUT);
pinMatrixOutAttach(pin, GPIO_SD0_OUT_IDX + channel, false, false);
}
void sigmaDeltaDetachPin(uint8_t pin)
{
pinMatrixOutDetach(pin, false, false);
}