arduino-esp32/cores/esp32/esp32-hal-sd.c

87 lines
2.5 KiB
C
Raw Normal View History

2016-10-19 23:31:03 +02:00
// 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"
xSemaphoreHandle _sd_sys_lock;
#define SD_MUTEX_LOCK() do {} while (xSemaphoreTake(_sd_sys_lock, portMAX_DELAY) != pdPASS)
#define SD_MUTEX_UNLOCK() xSemaphoreGive(_sd_sys_lock)
uint32_t sdSetup(uint8_t channel, uint32_t freq) //chan 0-7 freq 1220-312500
{
if(channel > 7) {
return 0;
}
static bool tHasStarted = false;
if(!tHasStarted) {
tHasStarted = true;
_sd_sys_lock = xSemaphoreCreateMutex();
}
gpio_sd_dev_t * gpio_sd_dev = (volatile gpio_sd_dev_t *)(DR_REG_GPIO_SD_BASE);
uint32_t prescale = (10000000/(freq*32)) - 1;
if(prescale > 0xFF) {
prescale = 0xFF;
}
SD_MUTEX_LOCK();
gpio_sd_dev->channel[channel].prescale = prescale;
gpio_sd_dev->cg.clk_en = 0;
gpio_sd_dev->cg.clk_en = 1;
SD_MUTEX_UNLOCK();
return 10000000/((prescale + 1) * 32);
}
void sdWrite(uint8_t channel, uint8_t duty) //chan 0-7 duty 8 bit
{
if(channel > 7) {
return;
}
duty += 128;
gpio_sd_dev_t * gpio_sd_dev = (volatile gpio_sd_dev_t *)(DR_REG_GPIO_SD_BASE);
SD_MUTEX_LOCK();
gpio_sd_dev->channel[channel].duty = duty;
SD_MUTEX_UNLOCK();
}
uint8_t sdRead(uint8_t channel) //chan 0-7
{
if(channel > 7) {
return 0;
}
gpio_sd_dev_t * gpio_sd_dev = (volatile gpio_sd_dev_t *)(DR_REG_GPIO_SD_BASE);
return gpio_sd_dev->channel[channel].duty - 128;
}
void sdAttachPin(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 sdDetachPin(uint8_t pin)
{
pinMatrixOutDetach(pin, false, false);
}