133 lines
3.6 KiB
C
133 lines
3.6 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 "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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#include "esp_system.h"
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#ifdef ESP_IDF_VERSION_MAJOR // IDF 4+
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#if CONFIG_IDF_TARGET_ESP32 // ESP32/PICO-D4
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#include "esp32/rom/ets_sys.h"
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#elif CONFIG_IDF_TARGET_ESP32S2
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#include "esp32s2/rom/ets_sys.h"
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#elif CONFIG_IDF_TARGET_ESP32C3
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#include "esp32c3/rom/ets_sys.h"
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#else
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#error Target CONFIG_IDF_TARGET is not supported
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#endif
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#else // ESP32 Before IDF 4.0
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#include "rom/ets_sys.h"
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#endif
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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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static void _on_apb_change(void * arg, apb_change_ev_t ev_type, uint32_t old_apb, uint32_t new_apb){
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if(old_apb == new_apb){
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return;
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}
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uint32_t iarg = (uint32_t)arg;
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uint8_t channel = iarg;
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if(ev_type == APB_BEFORE_CHANGE){
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SIGMADELTA.cg.clk_en = 0;
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} else {
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old_apb /= 1000000;
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new_apb /= 1000000;
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SD_MUTEX_LOCK();
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uint32_t old_prescale = SIGMADELTA.channel[channel].prescale + 1;
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SIGMADELTA.channel[channel].prescale = ((new_apb * old_prescale) / old_apb) - 1;
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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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}
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}
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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 apb_freq = getApbFrequency();
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uint32_t prescale = (apb_freq/(freq*256)) - 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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#ifndef CONFIG_IDF_TARGET_ESP32
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SIGMADELTA.misc.function_clk_en = 1;
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#endif
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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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uint32_t iarg = channel;
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addApbChangeCallback((void*)iarg, _on_apb_change);
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return apb_freq/((prescale + 1) * 256);
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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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