607 lines
23 KiB
C
607 lines
23 KiB
C
/* Name: usbdrv.c
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* Project: V-USB, virtual USB port for Atmel's(r) AVR(r) microcontrollers
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* Author: Christian Starkjohann
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* Creation Date: 2004-12-29
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* Tabsize: 4
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* Copyright: (c) 2005 by OBJECTIVE DEVELOPMENT Software GmbH
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* License: GNU GPL v2 (see License.txt), GNU GPL v3 or proprietary (CommercialLicense.txt)
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* This Revision: $Id: usbdrv.c 791 2010-07-15 15:56:13Z cs $
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*/
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#include "usbportability.h"
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#include "usbdrv.h"
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#include "oddebug.h"
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/*
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General Description:
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This module implements the C-part of the USB driver. See usbdrv.h for a
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documentation of the entire driver.
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*/
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/* ------------------------------------------------------------------------- */
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/* raw USB registers / interface to assembler code: */
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uchar usbRxBuf[2*USB_BUFSIZE]; /* raw RX buffer: PID, 8 bytes data, 2 bytes CRC */
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uchar usbInputBufOffset; /* offset in usbRxBuf used for low level receiving */
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uchar usbDeviceAddr; /* assigned during enumeration, defaults to 0 */
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uchar usbNewDeviceAddr; /* device ID which should be set after status phase */
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uchar usbConfiguration; /* currently selected configuration. Administered by driver, but not used */
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volatile schar usbRxLen; /* = 0; number of bytes in usbRxBuf; 0 means free, -1 for flow control */
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uchar usbCurrentTok; /* last token received or endpoint number for last OUT token if != 0 */
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uchar usbRxToken; /* token for data we received; or endpont number for last OUT */
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volatile uchar usbTxLen = USBPID_NAK; /* number of bytes to transmit with next IN token or handshake token */
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uchar usbTxBuf[USB_BUFSIZE];/* data to transmit with next IN, free if usbTxLen contains handshake token */
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#if USB_COUNT_SOF
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volatile uchar usbSofCount; /* incremented by assembler module every SOF */
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#endif
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#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
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usbTxStatus_t usbTxStatus1;
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# if USB_CFG_HAVE_INTRIN_ENDPOINT3
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usbTxStatus_t usbTxStatus3;
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# endif
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#endif
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#if USB_CFG_CHECK_DATA_TOGGLING
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uchar usbCurrentDataToken;/* when we check data toggling to ignore duplicate packets */
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#endif
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/* USB status registers / not shared with asm code */
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uchar *usbMsgPtr; /* data to transmit next -- ROM or RAM address */
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static usbMsgLen_t usbMsgLen = USB_NO_MSG; /* remaining number of bytes */
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#ifdef USB_CFG_USE_GPIOR
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# define usbMsgFlags (*((uchar*)&GPIOR0))
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#else
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static uchar usbMsgFlags; /* flag values see below */
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#endif
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#define USB_FLG_MSGPTR_IS_ROM (1<<6)
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#define USB_FLG_USE_USER_RW (1<<7)
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/*
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optimizing hints:
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- do not post/pre inc/dec integer values in operations
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- assign value of USB_READ_FLASH() to register variables and don't use side effects in arg
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- use narrow scope for variables which should be in X/Y/Z register
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- assign char sized expressions to variables to force 8 bit arithmetics
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*/
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/* -------------------------- String Descriptors --------------------------- */
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#if USB_CFG_DESCR_PROPS_STRINGS == 0
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#if USB_CFG_DESCR_PROPS_STRING_0 == 0
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#undef USB_CFG_DESCR_PROPS_STRING_0
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#define USB_CFG_DESCR_PROPS_STRING_0 sizeof(usbDescriptorString0)
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PROGMEM char usbDescriptorString0[] = { /* language descriptor */
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4, /* sizeof(usbDescriptorString0): length of descriptor in bytes */
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3, /* descriptor type */
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0x09, 0x04, /* language index (0x0409 = US-English) */
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};
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#endif
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#if USB_CFG_DESCR_PROPS_STRING_VENDOR == 0 && USB_CFG_VENDOR_NAME_LEN
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#undef USB_CFG_DESCR_PROPS_STRING_VENDOR
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#define USB_CFG_DESCR_PROPS_STRING_VENDOR sizeof(usbDescriptorStringVendor)
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PROGMEM int usbDescriptorStringVendor[] = {
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USB_STRING_DESCRIPTOR_HEADER(USB_CFG_VENDOR_NAME_LEN),
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USB_CFG_VENDOR_NAME
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};
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#endif
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#if USB_CFG_DESCR_PROPS_STRING_PRODUCT == 0 && USB_CFG_DEVICE_NAME_LEN
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#undef USB_CFG_DESCR_PROPS_STRING_PRODUCT
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#define USB_CFG_DESCR_PROPS_STRING_PRODUCT sizeof(usbDescriptorStringDevice)
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PROGMEM int usbDescriptorStringDevice[] = {
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USB_STRING_DESCRIPTOR_HEADER(USB_CFG_DEVICE_NAME_LEN),
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USB_CFG_DEVICE_NAME
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};
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#endif
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#if USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER == 0 && USB_CFG_SERIAL_NUMBER_LEN
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#undef USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER
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#define USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER sizeof(usbDescriptorStringSerialNumber)
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PROGMEM int usbDescriptorStringSerialNumber[] = {
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USB_STRING_DESCRIPTOR_HEADER(USB_CFG_SERIAL_NUMBER_LEN),
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USB_CFG_SERIAL_NUMBER
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};
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#endif
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#endif /* USB_CFG_DESCR_PROPS_STRINGS == 0 */
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/* --------------------------- Device Descriptor --------------------------- */
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#if USB_CFG_DESCR_PROPS_DEVICE == 0
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#undef USB_CFG_DESCR_PROPS_DEVICE
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#define USB_CFG_DESCR_PROPS_DEVICE sizeof(usbDescriptorDevice)
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PROGMEM char usbDescriptorDevice[] = { /* USB device descriptor */
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18, /* sizeof(usbDescriptorDevice): length of descriptor in bytes */
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USBDESCR_DEVICE, /* descriptor type */
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0x10, 0x01, /* USB version supported */
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USB_CFG_DEVICE_CLASS,
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USB_CFG_DEVICE_SUBCLASS,
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0, /* protocol */
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8, /* max packet size */
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/* the following two casts affect the first byte of the constant only, but
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* that's sufficient to avoid a warning with the default values.
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*/
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(char)USB_CFG_VENDOR_ID,/* 2 bytes */
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(char)USB_CFG_DEVICE_ID,/* 2 bytes */
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USB_CFG_DEVICE_VERSION, /* 2 bytes */
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USB_CFG_DESCR_PROPS_STRING_VENDOR != 0 ? 1 : 0, /* manufacturer string index */
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USB_CFG_DESCR_PROPS_STRING_PRODUCT != 0 ? 2 : 0, /* product string index */
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USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER != 0 ? 3 : 0, /* serial number string index */
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1, /* number of configurations */
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};
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#endif
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/* ----------------------- Configuration Descriptor ------------------------ */
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#if USB_CFG_DESCR_PROPS_HID_REPORT != 0 && USB_CFG_DESCR_PROPS_HID == 0
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#undef USB_CFG_DESCR_PROPS_HID
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#define USB_CFG_DESCR_PROPS_HID 9 /* length of HID descriptor in config descriptor below */
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#endif
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#if USB_CFG_DESCR_PROPS_CONFIGURATION == 0
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#undef USB_CFG_DESCR_PROPS_CONFIGURATION
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#define USB_CFG_DESCR_PROPS_CONFIGURATION sizeof(usbDescriptorConfiguration)
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PROGMEM char usbDescriptorConfiguration[] = { /* USB configuration descriptor */
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9, /* sizeof(usbDescriptorConfiguration): length of descriptor in bytes */
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USBDESCR_CONFIG, /* descriptor type */
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18 + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT + 7 * USB_CFG_HAVE_INTRIN_ENDPOINT3 +
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(USB_CFG_DESCR_PROPS_HID & 0xff), 0,
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/* total length of data returned (including inlined descriptors) */
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1, /* number of interfaces in this configuration */
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1, /* index of this configuration */
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0, /* configuration name string index */
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#if USB_CFG_IS_SELF_POWERED
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(1 << 7) | USBATTR_SELFPOWER, /* attributes */
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#else
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(1 << 7), /* attributes */
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#endif
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USB_CFG_MAX_BUS_POWER/2, /* max USB current in 2mA units */
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/* interface descriptor follows inline: */
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9, /* sizeof(usbDescrInterface): length of descriptor in bytes */
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USBDESCR_INTERFACE, /* descriptor type */
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0, /* index of this interface */
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0, /* alternate setting for this interface */
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USB_CFG_HAVE_INTRIN_ENDPOINT + USB_CFG_HAVE_INTRIN_ENDPOINT3, /* endpoints excl 0: number of endpoint descriptors to follow */
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USB_CFG_INTERFACE_CLASS,
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USB_CFG_INTERFACE_SUBCLASS,
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USB_CFG_INTERFACE_PROTOCOL,
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0, /* string index for interface */
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#if (USB_CFG_DESCR_PROPS_HID & 0xff) /* HID descriptor */
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9, /* sizeof(usbDescrHID): length of descriptor in bytes */
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USBDESCR_HID, /* descriptor type: HID */
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0x01, 0x01, /* BCD representation of HID version */
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0x00, /* target country code */
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0x01, /* number of HID Report (or other HID class) Descriptor infos to follow */
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0x22, /* descriptor type: report */
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USB_CFG_HID_REPORT_DESCRIPTOR_LENGTH, 0, /* total length of report descriptor */
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#endif
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#if USB_CFG_HAVE_INTRIN_ENDPOINT /* endpoint descriptor for endpoint 1 */
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7, /* sizeof(usbDescrEndpoint) */
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USBDESCR_ENDPOINT, /* descriptor type = endpoint */
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(char)0x81, /* IN endpoint number 1 */
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0x03, /* attrib: Interrupt endpoint */
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8, 0, /* maximum packet size */
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USB_CFG_INTR_POLL_INTERVAL, /* in ms */
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#endif
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#if USB_CFG_HAVE_INTRIN_ENDPOINT3 /* endpoint descriptor for endpoint 3 */
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7, /* sizeof(usbDescrEndpoint) */
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USBDESCR_ENDPOINT, /* descriptor type = endpoint */
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(char)(0x80 | USB_CFG_EP3_NUMBER), /* IN endpoint number 3 */
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0x03, /* attrib: Interrupt endpoint */
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8, 0, /* maximum packet size */
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USB_CFG_INTR_POLL_INTERVAL, /* in ms */
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#endif
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};
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#endif
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/* ------------------------------------------------------------------------- */
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static inline void usbResetStall(void)
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{
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#if USB_CFG_IMPLEMENT_HALT && USB_CFG_HAVE_INTRIN_ENDPOINT
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usbTxLen1 = USBPID_NAK;
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#if USB_CFG_HAVE_INTRIN_ENDPOINT3
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usbTxLen3 = USBPID_NAK;
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#endif
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#endif
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}
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/* ------------------------------------------------------------------------- */
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#if !USB_CFG_SUPPRESS_INTR_CODE
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#if USB_CFG_HAVE_INTRIN_ENDPOINT
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static void usbGenericSetInterrupt(uchar *data, uchar len, usbTxStatus_t *txStatus)
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{
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uchar *p;
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char i;
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#if USB_CFG_IMPLEMENT_HALT
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if(usbTxLen1 == USBPID_STALL)
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return;
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#endif
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if(txStatus->len & 0x10){ /* packet buffer was empty */
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txStatus->buffer[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */
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}else{
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txStatus->len = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */
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}
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p = txStatus->buffer + 1;
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i = len;
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do{ /* if len == 0, we still copy 1 byte, but that's no problem */
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*p++ = *data++;
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}while(--i > 0); /* loop control at the end is 2 bytes shorter than at beginning */
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usbCrc16Append(&txStatus->buffer[1], len);
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txStatus->len = len + 4; /* len must be given including sync byte */
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DBG2(0x21 + (((int)txStatus >> 3) & 3), txStatus->buffer, len + 3);
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}
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USB_PUBLIC void usbSetInterrupt(uchar *data, uchar len)
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{
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usbGenericSetInterrupt(data, len, &usbTxStatus1);
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}
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#endif
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#if USB_CFG_HAVE_INTRIN_ENDPOINT3
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USB_PUBLIC void usbSetInterrupt3(uchar *data, uchar len)
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{
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usbGenericSetInterrupt(data, len, &usbTxStatus3);
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}
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#endif
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#endif /* USB_CFG_SUPPRESS_INTR_CODE */
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/* ------------------ utilities for code following below ------------------- */
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/* Use defines for the switch statement so that we can choose between an
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* if()else if() and a switch/case based implementation. switch() is more
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* efficient for a LARGE set of sequential choices, if() is better in all other
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* cases.
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*/
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#if USB_CFG_USE_SWITCH_STATEMENT
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# define SWITCH_START(cmd) switch(cmd){{
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# define SWITCH_CASE(value) }break; case (value):{
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# define SWITCH_CASE2(v1,v2) }break; case (v1): case(v2):{
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# define SWITCH_CASE3(v1,v2,v3) }break; case (v1): case(v2): case(v3):{
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# define SWITCH_DEFAULT }break; default:{
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# define SWITCH_END }}
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#else
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# define SWITCH_START(cmd) {uchar _cmd = cmd; if(0){
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# define SWITCH_CASE(value) }else if(_cmd == (value)){
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# define SWITCH_CASE2(v1,v2) }else if(_cmd == (v1) || _cmd == (v2)){
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# define SWITCH_CASE3(v1,v2,v3) }else if(_cmd == (v1) || _cmd == (v2) || (_cmd == v3)){
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# define SWITCH_DEFAULT }else{
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# define SWITCH_END }}
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#endif
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#ifndef USB_RX_USER_HOOK
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#define USB_RX_USER_HOOK(data, len)
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#endif
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#ifndef USB_SET_ADDRESS_HOOK
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#define USB_SET_ADDRESS_HOOK()
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#endif
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/* ------------------------------------------------------------------------- */
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/* We use if() instead of #if in the macro below because #if can't be used
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* in macros and the compiler optimizes constant conditions anyway.
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* This may cause problems with undefined symbols if compiled without
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* optimizing!
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*/
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#define GET_DESCRIPTOR(cfgProp, staticName) \
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if(cfgProp){ \
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if((cfgProp) & USB_PROP_IS_RAM) \
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flags = 0; \
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if((cfgProp) & USB_PROP_IS_DYNAMIC){ \
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len = usbFunctionDescriptor(rq); \
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}else{ \
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len = USB_PROP_LENGTH(cfgProp); \
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usbMsgPtr = (uchar *)(staticName); \
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} \
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}
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/* usbDriverDescriptor() is similar to usbFunctionDescriptor(), but used
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* internally for all types of descriptors.
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*/
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static inline usbMsgLen_t usbDriverDescriptor(usbRequest_t *rq)
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{
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usbMsgLen_t len = 0;
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uchar flags = USB_FLG_MSGPTR_IS_ROM;
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SWITCH_START(rq->wValue.bytes[1])
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SWITCH_CASE(USBDESCR_DEVICE) /* 1 */
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice)
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SWITCH_CASE(USBDESCR_CONFIG) /* 2 */
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration)
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SWITCH_CASE(USBDESCR_STRING) /* 3 */
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#if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC
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if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM)
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flags = 0;
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len = usbFunctionDescriptor(rq);
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#else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
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SWITCH_START(rq->wValue.bytes[0])
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SWITCH_CASE(0)
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0)
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SWITCH_CASE(1)
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor)
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SWITCH_CASE(2)
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_PRODUCT, usbDescriptorStringDevice)
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SWITCH_CASE(3)
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber)
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SWITCH_DEFAULT
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if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
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len = usbFunctionDescriptor(rq);
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}
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SWITCH_END
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#endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */
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#if USB_CFG_DESCR_PROPS_HID_REPORT /* only support HID descriptors if enabled */
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SWITCH_CASE(USBDESCR_HID) /* 0x21 */
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18)
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SWITCH_CASE(USBDESCR_HID_REPORT)/* 0x22 */
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GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport)
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#endif
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SWITCH_DEFAULT
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if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){
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len = usbFunctionDescriptor(rq);
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}
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SWITCH_END
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usbMsgFlags = flags;
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return len;
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}
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/* ------------------------------------------------------------------------- */
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/* usbDriverSetup() is similar to usbFunctionSetup(), but it's used for
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* standard requests instead of class and custom requests.
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*/
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static inline usbMsgLen_t usbDriverSetup(usbRequest_t *rq)
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{
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uchar len = 0, *dataPtr = usbTxBuf + 9; /* there are 2 bytes free space at the end of the buffer */
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uchar value = rq->wValue.bytes[0];
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#if USB_CFG_IMPLEMENT_HALT
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uchar index = rq->wIndex.bytes[0];
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#endif
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dataPtr[0] = 0; /* default reply common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */
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SWITCH_START(rq->bRequest)
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SWITCH_CASE(USBRQ_GET_STATUS) /* 0 */
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uchar recipient = rq->bmRequestType & USBRQ_RCPT_MASK; /* assign arith ops to variables to enforce byte size */
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if(USB_CFG_IS_SELF_POWERED && recipient == USBRQ_RCPT_DEVICE)
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dataPtr[0] = USB_CFG_IS_SELF_POWERED;
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#if USB_CFG_IMPLEMENT_HALT
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if(recipient == USBRQ_RCPT_ENDPOINT && index == 0x81) /* request status for endpoint 1 */
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dataPtr[0] = usbTxLen1 == USBPID_STALL;
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#endif
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dataPtr[1] = 0;
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len = 2;
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#if USB_CFG_IMPLEMENT_HALT
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SWITCH_CASE2(USBRQ_CLEAR_FEATURE, USBRQ_SET_FEATURE) /* 1, 3 */
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if(value == 0 && index == 0x81){ /* feature 0 == HALT for endpoint == 1 */
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usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL;
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usbResetDataToggling();
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}
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#endif
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SWITCH_CASE(USBRQ_SET_ADDRESS) /* 5 */
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usbNewDeviceAddr = value;
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USB_SET_ADDRESS_HOOK();
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SWITCH_CASE(USBRQ_GET_DESCRIPTOR) /* 6 */
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len = usbDriverDescriptor(rq);
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goto skipMsgPtrAssignment;
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SWITCH_CASE(USBRQ_GET_CONFIGURATION) /* 8 */
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dataPtr = &usbConfiguration; /* send current configuration value */
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len = 1;
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SWITCH_CASE(USBRQ_SET_CONFIGURATION) /* 9 */
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usbConfiguration = value;
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usbResetStall();
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SWITCH_CASE(USBRQ_GET_INTERFACE) /* 10 */
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len = 1;
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#if USB_CFG_HAVE_INTRIN_ENDPOINT && !USB_CFG_SUPPRESS_INTR_CODE
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SWITCH_CASE(USBRQ_SET_INTERFACE) /* 11 */
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usbResetDataToggling();
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usbResetStall();
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#endif
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SWITCH_DEFAULT /* 7=SET_DESCRIPTOR, 12=SYNC_FRAME */
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/* Should we add an optional hook here? */
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SWITCH_END
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usbMsgPtr = dataPtr;
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skipMsgPtrAssignment:
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return len;
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}
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/* ------------------------------------------------------------------------- */
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/* usbProcessRx() is called for every message received by the interrupt
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* routine. It distinguishes between SETUP and DATA packets and processes
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* them accordingly.
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*/
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static inline void usbProcessRx(uchar *data, uchar len)
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{
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usbRequest_t *rq = (void *)data;
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/* usbRxToken can be:
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* 0x2d 00101101 (USBPID_SETUP for setup data)
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* 0xe1 11100001 (USBPID_OUT: data phase of setup transfer)
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* 0...0x0f for OUT on endpoint X
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*/
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DBG2(0x10 + (usbRxToken & 0xf), data, len + 2); /* SETUP=1d, SETUP-DATA=11, OUTx=1x */
|
|
USB_RX_USER_HOOK(data, len)
|
|
#if USB_CFG_IMPLEMENT_FN_WRITEOUT
|
|
if(usbRxToken < 0x10){ /* OUT to endpoint != 0: endpoint number in usbRxToken */
|
|
usbFunctionWriteOut(data, len);
|
|
return;
|
|
}
|
|
#endif
|
|
if(usbRxToken == (uchar)USBPID_SETUP){
|
|
if(len != 8) /* Setup size must be always 8 bytes. Ignore otherwise. */
|
|
return;
|
|
usbMsgLen_t replyLen;
|
|
usbTxBuf[0] = USBPID_DATA0; /* initialize data toggling */
|
|
usbTxLen = USBPID_NAK; /* abort pending transmit */
|
|
usbMsgFlags = 0;
|
|
uchar type = rq->bmRequestType & USBRQ_TYPE_MASK;
|
|
if(type != USBRQ_TYPE_STANDARD){ /* standard requests are handled by driver */
|
|
replyLen = usbFunctionSetup(data);
|
|
}else{
|
|
replyLen = usbDriverSetup(rq);
|
|
}
|
|
#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE
|
|
if(replyLen == USB_NO_MSG){ /* use user-supplied read/write function */
|
|
/* do some conditioning on replyLen, but on IN transfers only */
|
|
if((rq->bmRequestType & USBRQ_DIR_MASK) != USBRQ_DIR_HOST_TO_DEVICE){
|
|
if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
|
|
replyLen = rq->wLength.bytes[0];
|
|
}else{
|
|
replyLen = rq->wLength.word;
|
|
}
|
|
}
|
|
usbMsgFlags = USB_FLG_USE_USER_RW;
|
|
}else /* The 'else' prevents that we limit a replyLen of USB_NO_MSG to the maximum transfer len. */
|
|
#endif
|
|
if(sizeof(replyLen) < sizeof(rq->wLength.word)){ /* help compiler with optimizing */
|
|
if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */
|
|
replyLen = rq->wLength.bytes[0];
|
|
}else{
|
|
if(replyLen > rq->wLength.word) /* limit length to max */
|
|
replyLen = rq->wLength.word;
|
|
}
|
|
usbMsgLen = replyLen;
|
|
}else{ /* usbRxToken must be USBPID_OUT, which means data phase of setup (control-out) */
|
|
#if USB_CFG_IMPLEMENT_FN_WRITE
|
|
if(usbMsgFlags & USB_FLG_USE_USER_RW){
|
|
uchar rval = usbFunctionWrite(data, len);
|
|
if(rval == 0xff){ /* an error occurred */
|
|
usbTxLen = USBPID_STALL;
|
|
}else if(rval != 0){ /* This was the final package */
|
|
usbMsgLen = 0; /* answer with a zero-sized data packet */
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/* This function is similar to usbFunctionRead(), but it's also called for
|
|
* data handled automatically by the driver (e.g. descriptor reads).
|
|
*/
|
|
static uchar usbDeviceRead(uchar *data, uchar len)
|
|
{
|
|
if(len > 0){ /* don't bother app with 0 sized reads */
|
|
#if USB_CFG_IMPLEMENT_FN_READ
|
|
if(usbMsgFlags & USB_FLG_USE_USER_RW){
|
|
len = usbFunctionRead(data, len);
|
|
}else
|
|
#endif
|
|
{
|
|
uchar i = len, *r = usbMsgPtr;
|
|
if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */
|
|
do{
|
|
uchar c = USB_READ_FLASH(r); /* assign to char size variable to enforce byte ops */
|
|
*data++ = c;
|
|
r++;
|
|
}while(--i);
|
|
}else{ /* RAM data */
|
|
do{
|
|
*data++ = *r++;
|
|
}while(--i);
|
|
}
|
|
usbMsgPtr = r;
|
|
}
|
|
}
|
|
return len;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
/* usbBuildTxBlock() is called when we have data to transmit and the
|
|
* interrupt routine's transmit buffer is empty.
|
|
*/
|
|
static inline void usbBuildTxBlock(void)
|
|
{
|
|
usbMsgLen_t wantLen;
|
|
uchar len;
|
|
|
|
wantLen = usbMsgLen;
|
|
if(wantLen > 8)
|
|
wantLen = 8;
|
|
usbMsgLen -= wantLen;
|
|
usbTxBuf[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* DATA toggling */
|
|
len = usbDeviceRead(usbTxBuf + 1, wantLen);
|
|
if(len <= 8){ /* valid data packet */
|
|
usbCrc16Append(&usbTxBuf[1], len);
|
|
len += 4; /* length including sync byte */
|
|
if(len < 12) /* a partial package identifies end of message */
|
|
usbMsgLen = USB_NO_MSG;
|
|
}else{
|
|
len = USBPID_STALL; /* stall the endpoint */
|
|
usbMsgLen = USB_NO_MSG;
|
|
}
|
|
usbTxLen = len;
|
|
DBG2(0x20, usbTxBuf, len-1);
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
#ifdef USB_RESET_HOOK
|
|
static inline void usbHandleResetHook(uchar notResetState)
|
|
{
|
|
static uchar wasReset;
|
|
uchar isReset = !notResetState;
|
|
|
|
if(wasReset != isReset){
|
|
USB_RESET_HOOK(isReset);
|
|
wasReset = isReset;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|
|
USB_PUBLIC void usbPoll(void)
|
|
{
|
|
schar len;
|
|
uchar i;
|
|
|
|
len = usbRxLen - 3;
|
|
if(len >= 0){
|
|
/* We could check CRC16 here -- but ACK has already been sent anyway. If you
|
|
* need data integrity checks with this driver, check the CRC in your app
|
|
* code and report errors back to the host. Since the ACK was already sent,
|
|
* retries must be handled on application level.
|
|
* unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3);
|
|
*/
|
|
usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len);
|
|
#if USB_CFG_HAVE_FLOWCONTROL
|
|
if(usbRxLen > 0) /* only mark as available if not inactivated */
|
|
usbRxLen = 0;
|
|
#else
|
|
usbRxLen = 0; /* mark rx buffer as available */
|
|
#endif
|
|
}
|
|
if(usbTxLen & 0x10){ /* transmit system idle */
|
|
if(usbMsgLen != USB_NO_MSG){ /* transmit data pending? */
|
|
usbBuildTxBlock();
|
|
}
|
|
}
|
|
for(i = 20; i > 0; i--){
|
|
uchar usbLineStatus = USBIN & USBMASK;
|
|
if(usbLineStatus != 0) /* SE0 has ended */
|
|
#ifdef USB_RESET_HOOK
|
|
goto isNotReset;
|
|
#else
|
|
return;
|
|
#endif
|
|
}
|
|
/* RESET condition, called multiple times during reset */
|
|
usbNewDeviceAddr = 0;
|
|
usbDeviceAddr = 0;
|
|
usbResetStall();
|
|
DBG1(0xff, 0, 0);
|
|
#ifdef USB_RESET_HOOK
|
|
isNotReset:
|
|
usbHandleResetHook(i);
|
|
#endif
|
|
}
|
|
|
|
/* ------------------------------------------------------------------------- */
|
|
|