142 lines
5.5 KiB
C
142 lines
5.5 KiB
C
/**************************************************************************/
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/*!
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@file usb_msc_flash.c
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@author hathach (tinyusb.org)
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@section LICENSE
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Software License Agreement (BSD License)
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Copyright (c) 2018, Adafruit Industries (adafruit.com)
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holders nor the
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names of its contributors may be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
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EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**************************************************************************/
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#include "tusb.h"
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#include "internal_flash.h"
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// For updating fatfs's cache
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#include "extmod/vfs.h"
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#include "extmod/vfs_fat.h"
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#include "lib/oofatfs/ff.h"
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#include "py/mpstate.h"
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/*------------------------------------------------------------------*/
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/* MACRO TYPEDEF CONSTANT ENUM
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*------------------------------------------------------------------*/
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#define MSC_FLASH_ADDR_END 0xED000
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#define MSC_FLASH_SIZE (256*1024)
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#define MSC_FLASH_ADDR_START (MSC_FLASH_ADDR_END-MSC_FLASH_SIZE)
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#define MSC_FLASH_BLOCK_SIZE 512
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#define FL_PAGE_SZ 4096
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// Callback invoked when received an SCSI command not in built-in list below
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// - READ_CAPACITY10, READ_FORMAT_CAPACITY, INQUIRY, MODE_SENSE6, REQUEST_SENSE
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// - READ10 and WRITE10 has their own callbacks
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int32_t tud_msc_scsi_cb (uint8_t lun, uint8_t const scsi_cmd[16], void* buffer, uint16_t bufsize) {
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void const* response = NULL;
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uint16_t resplen = 0;
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switch ( scsi_cmd[0] ) {
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case SCSI_CMD_TEST_UNIT_READY:
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// Command that host uses to check our readiness before sending other commands
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resplen = 0;
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break;
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case SCSI_CMD_PREVENT_ALLOW_MEDIUM_REMOVAL:
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// Host is about to read/write etc ... better not to disconnect disk
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resplen = 0;
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break;
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case SCSI_CMD_START_STOP_UNIT:
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// Host try to eject/safe remove/poweroff us. We could safely disconnect with disk storage, or go into lower power
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/* scsi_start_stop_unit_t const * start_stop = (scsi_start_stop_unit_t const *) scsi_cmd;
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// Start bit = 0 : low power mode, if load_eject = 1 : unmount disk storage as well
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// Start bit = 1 : Ready mode, if load_eject = 1 : mount disk storage
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start_stop->start;
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start_stop->load_eject;
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*/
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resplen = 0;
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break;
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// negative means error -> tusb could stall and/or response with failed status
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default: return -1;
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}
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// return len must not larger than bufsize
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if ( resplen > bufsize ) resplen = bufsize;
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// copy response to stack's buffer if any
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if ( response && resplen ) {
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memcpy(buffer, response, resplen);
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}
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return resplen;
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}
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// Callback invoked when received READ10 command.
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// Copy disk's data to buffer (up to bufsize) and return number of copied bytes.
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int32_t tud_msc_read10_cb (uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize) {
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(void) lun;
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(void) offset;
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uint32_t const block_count = bufsize / MSC_FLASH_BLOCK_SIZE;
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internal_flash_read_blocks(buffer, lba, block_count);
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return block_count * MSC_FLASH_BLOCK_SIZE;
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}
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// Callback invoked when received WRITE10 command.
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// Process data in buffer to disk's storage and return number of written bytes
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int32_t tud_msc_write10_cb (uint8_t lun, uint32_t lba, uint32_t offset, void* buffer, uint32_t bufsize) {
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(void) lun;
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(void) offset;
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uint32_t const block_count = bufsize / MSC_FLASH_BLOCK_SIZE;
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// bufsize <= CFG_TUD_MSC_BUFSIZE (4096)
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internal_flash_write_blocks(buffer, lba, block_count);
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// update fatfs's cache if address matches
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fs_user_mount_t* vfs = MP_STATE_VM(vfs_mount_table)->obj;
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if ( (lba <= vfs->fatfs.winsect) && (vfs->fatfs.winsect <= (lba + bufsize / MSC_FLASH_BLOCK_SIZE)) ) {
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memcpy(vfs->fatfs.win, buffer + MSC_FLASH_BLOCK_SIZE * (vfs->fatfs.winsect - lba), MSC_FLASH_BLOCK_SIZE);
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}
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return block_count * MSC_FLASH_BLOCK_SIZE;
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}
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// Callback invoked when WRITE10 command is completed (status received and accepted by host).
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// used to flush any pending cache.
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void tud_msc_write10_complete_cb (uint8_t lun) {
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(void) lun;
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// flush pending cache when write10 is complete
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internal_flash_flush();
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}
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