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/*
* Copyright (c) 2006-2021, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <rtthread.h>
#include <dfs.h>
#define DBG_TAG "sd.sim"
#define DBG_LVL DBG_WARNING
#include <rtdbg.h>
#define SDCARD_SIM "sd.bin"
#define SDCARD_SIZE (16*1024*1024) //16M
struct sdcard_device
{
struct rt_device parent;
FILE *file;
};
static struct sdcard_device _sdcard;
#define SDCARD_DEVICE(device) (( struct sdcard_device*)(device))
static rt_mutex_t lock;
/* RT-Thread device interface */
static rt_err_t rt_sdcard_init(rt_device_t dev)
{
return RT_EOK;
}
static rt_err_t rt_sdcard_open(rt_device_t dev, rt_uint16_t oflag)
{
return RT_EOK;
}
static rt_err_t rt_sdcard_close(rt_device_t dev)
{
return RT_EOK;
}
/* position: block page address, not bytes address
* buffer:
* size : how many blocks
*/
static rt_ssize_t rt_sdcard_read(rt_device_t device, rt_off_t position, void *buffer, rt_size_t size)
{
struct sdcard_device *sd;
int result = 0;
LOG_I("sd read: pos %d, size %d", position, size);
rt_mutex_take(lock, RT_WAITING_FOREVER);
sd = SDCARD_DEVICE(device);
fseek(sd->file, position * SECTOR_SIZE, SEEK_SET);
result = fread(buffer, size * SECTOR_SIZE, 1, sd->file);
if (result < 0)
goto _err;
rt_mutex_release(lock);
return size;
_err:
LOG_E("sd read errors!");
rt_mutex_release(lock);
return 0;
}
/* position: block page address, not bytes address
* buffer:
* size : how many blocks
*/
static rt_ssize_t rt_sdcard_write(rt_device_t device, rt_off_t position, const void *buffer, rt_size_t size)
{
struct sdcard_device *sd;
int result = 0;
LOG_I("sst write: pos %d, size %d", position, size);
rt_mutex_take(lock, RT_WAITING_FOREVER);
sd = SDCARD_DEVICE(device);
fseek(sd->file, position * SECTOR_SIZE, SEEK_SET);
result = fwrite(buffer, size * SECTOR_SIZE, 1, sd->file);
if (result < 0)
goto _err;
rt_mutex_release(lock);
return size;
_err:
LOG_E("sd write errors!");
rt_mutex_release(lock);
return 0;
}
static rt_err_t rt_sdcard_control(rt_device_t dev, int cmd, void *args)
{
struct sdcard_device *sd;
unsigned int size;
RT_ASSERT(dev != RT_NULL);
sd = SDCARD_DEVICE(dev);
if (cmd == RT_DEVICE_CTRL_BLK_GETGEOME)
{
struct rt_device_blk_geometry *geometry;
geometry = (struct rt_device_blk_geometry *)args;
if (geometry == RT_NULL) return -RT_ERROR;
geometry->bytes_per_sector = SECTOR_SIZE;
geometry->block_size = SECTOR_SIZE;
fseek(sd->file, 0, SEEK_END);
size = ftell(sd->file);
geometry->sector_count = size / SECTOR_SIZE;
}
return RT_EOK;
}
rt_err_t rt_hw_sdcard_init(const char *spi_device_name)
{
int size;
struct sdcard_device *sd;
struct rt_device *device;
sd = &_sdcard;
device = &(sd->parent);
lock = rt_mutex_create("lock", RT_IPC_FLAG_PRIO);
if (lock == RT_NULL)
{
LOG_E("Create mutex in rt_hw_sdcard_init failed!");
return -RT_ERROR;
}
/* open sd card file, if not exist, then create it */
sd->file = fopen(SDCARD_SIM, "rb+");
if (sd->file == NULL)
{
/* create a file to simulate sd card */
sd->file = fopen(SDCARD_SIM, "wb+");
fseek(sd->file, 0, SEEK_END);
size = ftell(sd->file);
fseek(sd->file, 0, SEEK_SET);
if (size < SDCARD_SIZE)
{
int i;
unsigned char *ptr;
ptr = (unsigned char *) malloc(1024 * 1024);
if (ptr == NULL)
{
LOG_E("malloc error, no memory!");
return -RT_ERROR;
}
memset(ptr, 0x0, 1024 * 1024);
fseek(sd->file, 0, SEEK_SET);
for (i = 0; i < (SDCARD_SIZE / (1024 * 1024)); i++)
fwrite(ptr, 1024 * 1024, 1, sd->file);
free(ptr);
}
}
fseek(sd->file, 0, SEEK_SET);
device->type = RT_Device_Class_Block;
device->init = rt_sdcard_init;
device->open = rt_sdcard_open;
device->close = rt_sdcard_close;
device->read = rt_sdcard_read;
device->write = rt_sdcard_write;
device->control = rt_sdcard_control;
device->user_data = NULL;
rt_device_register(device, "sd0",
RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);
return RT_EOK;
}
#ifdef RT_USING_FINSH
int sd_erase(void)
{
rt_uint32_t index;
char * buffer;
struct rt_device *device;
device = &_sdcard.parent;
if ((buffer = rt_malloc(SECTOR_SIZE)) == RT_NULL)
{
rt_kprintf("out of memory\n");
return -1;
}
memset(buffer, 0, SECTOR_SIZE);
/* just erase the MBR! */
for (index = 0; index < 2; index ++)
{
rt_sdcard_write(device, index, buffer, SECTOR_SIZE);
}
rt_free(buffer);
return 0;
}
#endif
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