esp-idf/components/spi_flash/spi_flash_os_func_app.c

121 wiersze
3.2 KiB
C

// Copyright 2015-2019 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 <stdarg.h>
#include "esp32/rom/ets_sys.h"
#include "esp_attr.h"
#include "esp_spi_flash.h" //for ``g_flash_guard_default_ops``
#include "esp_flash.h"
/*
* OS functions providing delay service and arbitration among chips, and with the cache.
*
* The cache needs to be disabled when chips on the SPI1 bus is under operation, hence these functions need to be put
* into the IRAM,and their data should be put into the DRAM.
*/
typedef struct {
int host_id;
} app_func_arg_t;
// in the future we will have arbitration among devices, including flash on the same flash bus
static IRAM_ATTR esp_err_t spi_bus_acquire(int host_id)
{
return ESP_OK;
}
static IRAM_ATTR esp_err_t spi_bus_release(int host_id)
{
return ESP_OK;
}
//for SPI1, we have to disable the cache and interrupts before using the SPI bus
static IRAM_ATTR esp_err_t spi1_start(void *arg)
{
g_flash_guard_default_ops.start();
spi_bus_acquire(((app_func_arg_t *)arg)->host_id);
return ESP_OK;
}
static IRAM_ATTR esp_err_t spi1_end(void *arg)
{
g_flash_guard_default_ops.end();
spi_bus_release(((app_func_arg_t *)arg)->host_id);
return ESP_OK;
}
static esp_err_t spi23_start(void *arg)
{
spi_bus_acquire(((app_func_arg_t *)arg)->host_id);
return ESP_OK;
}
static esp_err_t spi23_end(void *arg)
{
spi_bus_release(((app_func_arg_t *)arg)->host_id);
return ESP_OK;
}
static IRAM_ATTR esp_err_t delay_ms(void *arg, unsigned ms)
{
ets_delay_us(1000 * ms);
return ESP_OK;
}
static DRAM_ATTR app_func_arg_t spi1_arg = {
.host_id = 0, //for SPI1,
};
static app_func_arg_t spi2_arg = {
.host_id = 1, //for SPI2,
};
static app_func_arg_t spi3_arg = {
.host_id = 2, //for SPI3,
};
//for SPI1, we have to disable the cache and interrupts before using the SPI bus
const DRAM_ATTR esp_flash_os_functions_t esp_flash_spi1_default_os_functions = {
.start = spi1_start,
.end = spi1_end,
.delay_ms = delay_ms,
};
const esp_flash_os_functions_t esp_flash_spi23_default_os_functions = {
.start = spi23_start,
.end = spi23_end,
.delay_ms = delay_ms,
};
esp_err_t esp_flash_init_os_functions(esp_flash_t *chip, int host_id)
{
if (host_id == 0) {
//SPI1
chip->os_func = &esp_flash_spi1_default_os_functions;
chip->os_func_data = &spi1_arg;
} else if (host_id == 1 || host_id == 2) {
//SPI2,3
chip->os_func = &esp_flash_spi23_default_os_functions;
chip->os_func_data = (host_id == 1) ? &spi2_arg : &spi3_arg;
} else {
return ESP_ERR_INVALID_ARG;
}
return ESP_OK;
}