USB PPRN (r_usb_pprn)

This module is USB Peripheral Printer Device Class Driver (PPRN). It implements the USB PPRN Interface.

Functions

Refer to USB (r_usb_basic) for the common API (r_usb_basic) to be called from the application.

Detailed Description

Overview

The r_usb_pprn module combines with the r_usb_basic module to provide a USB Peripheral Printer Device Class (PPRN) driver. The PPRN driver conforms to the USB Printer Device class specifications and implements communication with a printer host.

Features

The r_usb_pprn module has the following functions:

• Data transfer to and from a USB host
• Response to the printer class requests
• Response to function references from the printer host

Note

This driver is not guaranteed to provide USB printer operation in all scenarios. The developer must verify correct operation when connected to the targeted USB hosts.

Configuration

Build Time Configurations for r_usb_pprn

The following build time configurations are defined in fsp_cfg/r_usb_pprn_cfg.h:

Configuration	Options	Default	Description
Bulk In Pipe	USB PIPE1 USB PIPE2 USB PIPE3 USB PIPE4 USB PIPE5	USB PIPE4	Select the USB pipe to use for bulk in transfer.
Bulk Out Pipe	USB PIPE1 USB PIPE2 USB PIPE3 USB PIPE4 USB PIPE5	USB PIPE5	Select the USB pipe to use for bulk out transfer.

Configurations for Connectivity > USB PPRN (r_usb_pprn)

This module can be added to the Stacks tab via New Stack > Connectivity > USB PPRN (r_usb_pprn).

Configuration	Options	Default	Description
Name	Name must be a valid C symbol	g_pprn0	Module name.

Clock Configuration

Refer to the USB (r_usb_basic) module.

Pin Configuration

Refer to the USB (r_usb_basic) module.

Usage Notes

Class Requests (Host to Peripheral)

This driver notifies the application when receiving the following class requests:

Request	Code	Description
GET_DEVICE_ID	0x00	Get IEEE 1284 Device ID String
GET_PORT_STATUS	0x01	Get Printer's Status
SOFT_RESET	0x02	Flushes all buffers and resets the Bulk OUT and Bulk IN pipes

The data format of supported class requests is described below:

bmRequestType	bRequest	wValue	wIndex	wLength	Data
0xA1	GET_DEVICE_ID (0x00)	Config Index	Interface Alternate Setting	Maximum Length	1284 Device ID String
0xA1	GET_PORT_STATUS (0x01)	0	Interface	1	Printer Status
0x21	SOFT_RESET (0x02)	0	Interface	0	None

Limitations

• This driver does not support USB Low-speed mode.
• This driver does not support simultaneous operation with USB Host device class.

USB PPRN Example

This is a minimal example for implementing PPRN in bare metal and FreeRTOS application.

/******************************************************************************
 * Macro definitions
 ******************************************************************************/

/* Define device framework.  */
#define DEMO_PROTOCOL    (1U)          /* 1-Uni-dir, 2-Bi-dir */

#define VALUE_5BH        (0x5BU)

/******************************************************************************
 * Private global variables and functions
 ******************************************************************************/
static uint8_t g_port_status = PORT_STATUS_BENIGN;

/* Device printer device ID.  */
static uint8_t g_printer_device_id[] =
{
    0x00,                              /* data length */
    VALUE_5BH,

    'M',                               /* manufacturer (case sensitive) */
    'F',
    'G',
    ':',
    'G',
    'e',
    'n',
    'e',
    'r',
    'i',
    'c',
    ';',

    'M',                               /* model (case sensitive) */
    'D',
    'L',
    ':',
    'G',
    'e',
    'n',
    'e',
    'r',
    'i',
    'c',
    '_',
    '/',
    '_',
    'T',
    'e',
    'x',
    't',
    '_',
    'O',
    'n',
    'l',
    'y',
    ';',

    'C',                               /* PDL command set */
    'M',
    'D',
    ':',
    '1',
    '2',
    '8',
    '4',
    '.',
    '4',
    ';',

    'C',                               /* class */
    'L',
    'S',
    ':',
    'P',
    'R',
    'I',
    'N',
    'T',
    'E',
    'R',
    ';',

    'D',                               /* description */
    'E',
    'S',
    ':',
    'G',
    'e',
    'n',
    'e',
    'r',
    'i',
    'c',
    ' ',
    't',
    'e',
    'x',
    't',
    ' ',
    'o',
    'n',
    'l',
    'y',
    ' ',
    'p',
    'r',
    'i',
    'n',
    't',
    'e',
    'r',
    ';'
};

/******************************************************************************
 * Exported global functions (to be accessed by other files)
 ******************************************************************************/
void usb_pprn_example(void);

usb_instance_ctrl_t g_basic0_ctrl;

#if (BSP_CFG_RTOS == 2)

/******************************************************************************
 * Function Name   : usb_apl_callback
 * Description     : Callback function for Application program
 * Arguments       : usb_event_info_t *p_api_event    : Control structure for USB API.
 *               : usb_hdl_t        cur_task        : Task Handle
 *               : uint8_t          usb_state       : USB_ON(USB_STATUS_REQUEST) / USB_OFF
 * Return value    : none
 ******************************************************************************/
void usb_apl_callback (usb_event_info_t * p_api_event, usb_hdl_t cur_task, usb_onoff_t usb_state)
{
    (void) usb_state;
    (void) cur_task;

    xQueueSend(g_apl_mbx_hdl, (const void *) &p_api_event, (TickType_t) (0));
}                                      /* End of function usb_apl_callback */

#endif /* (BSP_CFG_RTOS == 2) */

/******************************************************************************
 * Function Name   : usb_pprn_example
 * Description     : Peripheral Printer Class(PRN) application main process
 * Arguments       : none
 * Return value    : none
 ******************************************************************************/
void usb_pprn_example (void)
{
    usb_event_info_t event_info;
    usb_status_t     event;
    usb_info_t       info;
#if (BSP_CFG_RTOS == 2)
    usb_event_info_t * p_mess;
#endif

    g_usb_on_usb.open(&g_basic0_ctrl, &g_basic0_cfg);

    while (1)
    {
#if (BSP_CFG_RTOS == 2)                /* FreeRTOS */
        xQueueReceive(g_apl_mbx_hdl, (void *) &p_mess, portMAX_DELAY);

        event_info = *p_mess;
        event      = event_info.event;
#else                                  /* (BSP_CFG_RTOS == 2) */
        /* Get USB event data */
        g_usb_on_usb.eventGet(&event_info, &event);
#endif

        /* Handle the received event (if any) */
        switch (event)
        {
            case USB_STATUS_CONFIGURED:

                /* Initialization complete; get data from host */
                g_usb_on_usb.read(&g_basic0_ctrl, g_buf, DATA_LEN, USB_CLASS_PPRN);

                break;

            case USB_STATUS_WRITE_COMPLETE:
#if DEMO_PROTOCOL > 1
                g_usb_on_usb.read(&g_basic0_ctrl, g_buf, DATA_LEN, USB_CLASS_PPRN);
#endif
                break;

            case USB_STATUS_READ_COMPLETE:
#if DEMO_PROTOCOL > 1

                /* Loop back to Host */
                g_usb_on_usb.write(&g_basic0_ctrl, g_buf, event_info.data_size, USB_CLASS_PPRN);
#else
                g_usb_on_usb.read(&g_basic0_ctrl, g_buf, DATA_LEN, USB_CLASS_PPRN);
#endif
                break;

            case USB_STATUS_REQUEST:   /* Receive Class Request */
                if (USB_PPRN_GET_DEVICE_ID == (event_info.setup.request_type & USB_BREQUEST))
                {
                    R_USB_InfoGet(&g_basic0_ctrl, &info, event_info.device_address);
                    R_USB_PeriControlDataSet(&g_basic0_ctrl, g_printer_device_id, PRINTER_DEVICE_ID_LENGTH);
                }
                else if (USB_PRPN_GET_PORT_STATUS == (event_info.setup.request_type & USB_BREQUEST))
                {
                    R_USB_InfoGet(&g_basic0_ctrl, &info, event_info.device_address);
                    R_USB_PeriControlDataSet(&g_basic0_ctrl, &g_port_status, 1);
                }
                else if (USB_PPRN_SOFT_RESET == (event_info.setup.request_type & USB_BREQUEST))
                {
                    R_USB_InfoGet(&g_basic0_ctrl, &info, event_info.device_address);
                    R_USB_PeriControlStatusSet(&g_basic0_ctrl, USB_SETUP_STATUS_ACK);

                    /* [To do] Transport Abort */
                    g_usb_on_usb.stop(&g_basic0_ctrl, USB_TRANSFER_READ, USB_CLASS_PPRN);
                }
                else
                {
                }

                break;

            case USB_STATUS_SUSPEND:
            case USB_STATUS_DETACH:
                break;

            default:
                break;
        }
    }
}

Descriptors

A template for PPRN descriptors can be found in ra/fsp/src/r_usb_pprn folder. Be sure to replace the vendor ID with your own.