Functions
fsp_err_t	R_USB_HMSC_StorageCommand (usb_ctrl_t const p_ctrl, uint8_t buf, uint8_t command, uint8_t destination)
	Processing for MassStorage(ATAPI) command. More...

fsp_err_t	R_USB_HMSC_DriveNumberGet (usb_ctrl_t const p_ctrl, uint8_t p_drive, uint8_t destination)
	Get number of Storage drive. More...

fsp_err_t	R_USB_HMSC_StorageReadSector (uint16_t drive_number, uint8_t *const buff, uint32_t sector_number, uint16_t sector_count)
	Read sector information. More...

fsp_err_t	R_USB_HMSC_StorageWriteSector (uint16_t drive_number, uint8_t const *const buff, uint32_t sector_number, uint16_t sector_count)
	Write sector information. More...

fsp_err_t	R_USB_HMSC_SemaphoreGet (void)
	Get a semaphore. (RTOS only) More...

fsp_err_t	R_USB_HMSC_SemaphoreRelease (void)
	Release a semaphore. (RTOS only) More...

Detailed Description

This module provides a USB Host Mass Storage Class (HMSC) driver. It implements the USB HMSC Interface.

Overview

The r_usb_hmsc module, when used in combination with the r_usb_basic module, operates as a USB Host Mass Storage Class (HMSC) driver. It is built on the USB Mass Storage Class Bulk-Only Transport (BOT) protocol. It is possible to communicate with BOT-compatible USB storage devices by combining this module with a file system and storage device driver.

Note: This module should be used in combination with the FreeRTOS+FAT File System.

Features

The r_usb_hmsc module has the following key features:

Checking of connected USB storage devices to determine whether or not operation is supported
Storage command communication using the BOT protocol
Support for SFF-8070i (ATAPI) USB mass storage subclass
Sharing of a single pipe for IN/OUT directions or multiple devices
Supports up to 4 connected USB storage devices

Class Requests

The class requests supported by this driver are shown below.

Request	Description
GetMaxLun	Gets the maximum number of units that are supported.
MassStorageReset	Cancels a protocol error.

Storage Commands

This driver supports the following storage commands:

TEST_UNIT_READY
MODE_SELECT10
MODE_SENSE10
PREVENT_ALLOW
READ_FORMAT_CAPACITY
READ10
WRITE10

Configuration

Refer to the USB (r_usb_basic) module.

Clock Configuration

Refer to the USB (r_usb_basic) module.

Pin Configuration

Refer to the USB (r_usb_basic) module.

Usage Notes

For Bare Metal

To use FreeRTOS+FAT without FreeRTOS, copy FreeRTOSConfig.h to the include path of your project.

Warning: Due to the wide variety of USB mass storage device implementations, this driver is not guaranteed to work with all devices. When implementing the driver it is important to verify correct operation with the mass storage devices that the end user is expected to use.

Limitations

Some MSC devices may be unable to connect because they are not recognized as storage devices.
MSC devices that return values of 1 or higher in response to the GetMaxLun command (mass storage class command) are not supported.
A maximum of 4 USB storage devices can be connected.
Only USB storage devices with a sector size of 512 bytes can be connected.
A device that does not respond to the READ_CAPACITY command operates as a device with a sector size of 512 bytes.
The continuous transfer mode cannot be used when using DMA.
This module must be incorporated into a project using r_usb_basic and does not provide any public APIs.
When using ff_fread() / ff_fwrite(), please append USB_BUFFER_PLACE_IN_SECTION to the declaration of the memory area specified as the first argument (pvBuffer), as shown below:

Example: uint8_t g_buffer[x] USB_BUFFER_PLACE_IN_SECTION;

Examples

USB HMSC Example

Example Operating Environment

The following shows an example operating environment for the HMSC.

Refer to the associated instruction manuals for details on setting up the evaluation board and using the emulator, etc.

Example Operating Environment

Application Specifications

The main functions of the application are as follows:

Performs enumeration and drive recognition processing on MSC devices.
After the above processsing finisihes, the application writes the file to the MSC device once.
After writing the above file, the APL repeatedly reads the file. It continues to read the file repeatedly until the switch is pressed again.

Application Processing (for RTOS)

This application has two tasks. An overview of the processing in these two tasks is provided below.

usb_apl_task

After start up, MPU pin setting, USB controller initialization, and application program initialization are performed.
The MSC device is attached to the kit. When enumeration and drive recognition processing have completed, the USB driver calls the callback function (usb_apl_callback). In the callback function (usb_apl_callback), the application task is notified of the USB completion event using the FreeRTOS functionality.
In the application task, information regarding the USB completion event about which notification was received from the callback function is retrieved using the real-time OS functionality.
If the USB completion event (the event member of the usb_ctrl_t structure) retrieved in step 2 above is USB_STS_CONFIGURED then, based on the USB completion event, the MSC device is mounted and the file is written to the MSC device.
If the USB completion event (the event member of the usb_ctrl_t structure) retrieved in step 2 above is USB_STS_DETACH, the application initializes the variables for state management.

usb_apl_task

file_read_task

Of the application tasks usb_apl_task and file_read_task, file_read_task is processed while usb_apl_task is in the wait state. This task performs file read processing on the file that was written to the MSC device.

Example Code

void usb_hmsc_baremetal_example (void)
{
    uint16_t  i;
    uint16_t  k;
    fsp_err_t err;
    FF_FILE * pxSourceFile;
    FF_Disk_t disk;
    rm_freertos_plus_fat_device_t device;
    usb_status_t     event;
    usb_event_info_t event_info;
    FF_Error_t       ff_err;
    size_t           size_return;
    int              close_err;
    rm_block_media_usb_instance_ctrl_t * p_instance_ctrl;
    for (i = 0; i < RM_FREERTOS_PLUS_FAT_EXAMPLE_BUFFER_SIZE_BYTES; i++)
    {
        g_file_data[i] = (uint8_t) i;
    }
    /* Open media driver.*/
    RM_FREERTOS_PLUS_FAT_Open(&g_rm_freertos_plus_fat0_ctrl, &g_rm_freertos_plus_fat0_cfg);
/* When using USB media, enable RM_FREERTOS_PLUS_FAT_EXAMPLE_SUPPORT_USB macro. */
 #ifdef RM_FREERTOS_PLUS_FAT_EXAMPLE_SUPPORT_USB
    while (1)
    {
        g_usb_on_usb.eventGet(&event_info, &event);
        switch (event)
        {
            case USB_STATUS_CONFIGURED:
            {
                /* Initialize the media and the disk. If the media is removable, it must be inserted before calling
                 * RM_FREERTOS_PLUS_FAT_MediaInit. */
                p_instance_ctrl                 = event_info.p_context;
                p_instance_ctrl->device_address = event_info.device_address;
                RM_FREERTOS_PLUS_FAT_MediaInit(&g_rm_freertos_plus_fat0_ctrl, &device);
                /* Initialize one disk for each partition used in the application. */
                RM_FREERTOS_PLUS_FAT_DiskInit(&g_rm_freertos_plus_fat0_ctrl, &g_rm_freertos_plus_fat0_disk_cfg, &disk);
                /* Mount each disk.  This assumes the disk is already partitioned and formatted. */
                FF_Mount(&disk, RM_FREERTOS_PLUS_FAT_EXAMPLE_PARTITION_NUMBER);
                /* Add the disk to the file system. */
                FF_FS_Add("/", &disk);
                /* Open a source file for writing. */
                pxSourceFile = ff_fopen((const char *) RM_FREERTOS_PLUS_FAT_EXAMPLE_FILE_NAME, "w");
                /* Write file data. */
                ff_fwrite(g_file_data, sizeof(g_file_data), 1, pxSourceFile);
                /* Close the file. */
                ff_fclose(pxSourceFile);
                g_state = STATE_FILE_READ;
                break;
            }
            case USB_STATUS_DETACH:
            {
                g_state = STATE_DETACH;
                RM_FREERTOS_PLUS_FAT_DiskDeinit(&g_rm_freertos_plus_fat0_ctrl, &disk);
                break;
            }
            default:
            {
                break;
            }
        }
        if (STATE_FILE_READ == g_state)
        {
            pxSourceFile = ff_fopen((const char *) RM_FREERTOS_PLUS_FAT_EXAMPLE_FILE_NAME, "r");
            for (k = 0; k < RM_FREERTOS_PLUS_FAT_EXAMPLE_BUFFER_SIZE_BYTES; k++)
            {
                g_read_buffer[k] = (uint8_t) 0;
            }
            /* Read file data. */
            size_return = ff_fread(g_read_buffer, sizeof(g_file_data), 1, pxSourceFile);
            /* Close the file. */
            close_err = ff_fclose(pxSourceFile);
        }
    }
 #endif
}

Function Documentation

◆ R_USB_HMSC_StorageCommand()

fsp_err_t R_USB_HMSC_StorageCommand	(	usb_ctrl_t *const	p_ctrl,
		uint8_t *	buf,
		uint8_t	command,
		uint8_t	destination
	)

Processing for MassStorage(ATAPI) command.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.
FSP_ERR_ASSERTION	Parameter Null pointer error.
FSP_ERR_USB_PARAMETER	Parameter error.

◆ R_USB_HMSC_DriveNumberGet()

fsp_err_t R_USB_HMSC_DriveNumberGet	(	usb_ctrl_t *const	p_ctrl,
		uint8_t *	p_drive,
		uint8_t	destination
	)

Get number of Storage drive.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.
FSP_ERR_ASSERTION	Parameter Null pointer error.
FSP_ERR_USB_PARAMETER	Parameter error.

◆ R_USB_HMSC_StorageReadSector()

fsp_err_t R_USB_HMSC_StorageReadSector	(	uint16_t	drive_number,
		uint8_t *const	buff,
		uint32_t	sector_number,
		uint16_t	sector_count
	)

Read sector information.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.
FSP_ERR_ASSERTION	Parameter Null pointer error.
FSP_ERR_USB_PARAMETER	Parameter error.

Note: The address specified in the argument buff must be 4-byte aligned.

◆ R_USB_HMSC_StorageWriteSector()

fsp_err_t R_USB_HMSC_StorageWriteSector	(	uint16_t	drive_number,
		uint8_t const *const	buff,
		uint32_t	sector_number,
		uint16_t	sector_count
	)

Write sector information.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.
FSP_ERR_ASSERTION	Parameter Null pointer error.
FSP_ERR_USB_PARAMETER	Parameter error.

Note: The address specified in the argument buff must be 4-byte aligned.

◆ R_USB_HMSC_SemaphoreGet()

fsp_err_t R_USB_HMSC_SemaphoreGet ( void )

Get a semaphore. (RTOS only)

If this function is called in the OS less execution environment, a failure is returned.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.

◆ R_USB_HMSC_SemaphoreRelease()

fsp_err_t R_USB_HMSC_SemaphoreRelease ( void )

Release a semaphore. (RTOS only)

If this function is called in the OS less execution environment, a failure is returned.

Return values

FSP_SUCCESS	Success.
FSP_ERR_USB_FAILED	The function could not be completed successfully.

Functions

Detailed Description

Overview

Features

Class Requests

Storage Commands

Configuration

Clock Configuration

Pin Configuration

Usage Notes

For Bare Metal

Limitations

Examples

USB HMSC Example

Application Specifications

Application Processing (for RTOS)

Example Code

Function Documentation

◆ R_USB_HMSC_StorageCommand()

◆ R_USB_HMSC_DriveNumberGet()

◆ R_USB_HMSC_StorageReadSector()

◆ R_USB_HMSC_StorageWriteSector()

◆ R_USB_HMSC_SemaphoreGet()

◆ R_USB_HMSC_SemaphoreRelease()