93 lines
2.4 KiB
C
93 lines
2.4 KiB
C
// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "esp32-hal.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "freertos/semphr.h"
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#include "rom/ets_sys.h"
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#include "esp32-hal-matrix.h"
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#include "soc/gpio_sd_reg.h"
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#include "soc/gpio_sd_struct.h"
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#if CONFIG_DISABLE_HAL_LOCKS
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#define SD_MUTEX_LOCK()
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#define SD_MUTEX_UNLOCK()
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#else
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#define SD_MUTEX_LOCK() do {} while (xSemaphoreTake(_sd_sys_lock, portMAX_DELAY) != pdPASS)
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#define SD_MUTEX_UNLOCK() xSemaphoreGive(_sd_sys_lock)
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xSemaphoreHandle _sd_sys_lock;
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#endif
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uint32_t sigmaDeltaSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-312500
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{
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if(channel > 7) {
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return 0;
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}
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#if !CONFIG_DISABLE_HAL_LOCKS
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static bool tHasStarted = false;
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if(!tHasStarted) {
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tHasStarted = true;
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_sd_sys_lock = xSemaphoreCreateMutex();
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}
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#endif
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uint32_t prescale = (10000000/(freq*32)) - 1;
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if(prescale > 0xFF) {
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prescale = 0xFF;
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}
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SD_MUTEX_LOCK();
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SIGMADELTA.channel[channel].prescale = prescale;
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SIGMADELTA.cg.clk_en = 0;
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SIGMADELTA.cg.clk_en = 1;
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SD_MUTEX_UNLOCK();
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return 10000000/((prescale + 1) * 32);
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}
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void sigmaDeltaWrite(uint8_t channel, uint8_t duty) //chan 0-7 duty 8 bit
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{
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if(channel > 7) {
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return;
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}
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duty += 128;
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SD_MUTEX_LOCK();
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SIGMADELTA.channel[channel].duty = duty;
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SD_MUTEX_UNLOCK();
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}
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uint8_t sigmaDeltaRead(uint8_t channel) //chan 0-7
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{
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if(channel > 7) {
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return 0;
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}
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SD_MUTEX_LOCK();
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uint8_t duty = SIGMADELTA.channel[channel].duty - 128;
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SD_MUTEX_UNLOCK();
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return duty;
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}
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void sigmaDeltaAttachPin(uint8_t pin, uint8_t channel) //channel 0-7
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{
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if(channel > 7) {
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return;
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}
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pinMode(pin, OUTPUT);
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pinMatrixOutAttach(pin, GPIO_SD0_OUT_IDX + channel, false, false);
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}
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void sigmaDeltaDetachPin(uint8_t pin)
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{
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pinMatrixOutDetach(pin, false, false);
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}
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