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/* Name: usbdrv.c |
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* Project: AVR USB driver |
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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) or proprietary (CommercialLicense.txt) |
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* This Revision: $Id: usbdrv.c,v 1.3 2007/06/07 13:53:47 harbaum Exp $ |
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*/ |
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#include "iarcompat.h" |
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#ifndef __IAR_SYSTEMS_ICC__ |
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# include <avr/io.h> |
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# include <avr/pgmspace.h> |
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#endif |
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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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#ifndef IAR_SECTION |
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#define IAR_SECTION(arg) |
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#define __no_init |
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#endif |
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/* The macro IAR_SECTION is a hack to allow IAR-cc compatibility. On gcc, it |
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* is defined to nothing. __no_init is required on IAR. |
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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, if more than 1 rx endpoint: MSb=endpoint */ |
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uchar usbRxToken; /* token for data we received; if more than 1 rx endpoint: MSb=endpoint */ |
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uchar usbMsgLen = 0xff; /* remaining number of bytes, no msg to send if -1 (see usbMsgPtr) */ |
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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_CFG_HAVE_INTRIN_ENDPOINT |
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volatile uchar usbTxLen1 = USBPID_NAK; /* TX count for endpoint 1 */ |
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uchar usbTxBuf1[USB_BUFSIZE]; /* TX data for endpoint 1 */ |
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#if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
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volatile uchar usbTxLen3 = USBPID_NAK; /* TX count for endpoint 1 */ |
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uchar usbTxBuf3[USB_BUFSIZE]; /* TX data for endpoint 1 */ |
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#endif |
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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 uchar usbMsgFlags; /* flag values see below */ |
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#define USB_FLG_TX_PACKET (1<<0) |
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/* Leave free 6 bits after TX_PACKET. This way we can increment usbMsgFlags to toggle TX_PACKET */ |
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#define USB_FLG_MSGPTR_IS_ROM (1<<6) |
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#define USB_FLG_USE_DEFAULT_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 PRG_RDB() 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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/* ------------------------------------------------------------------------- */ |
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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_DEVICE == 0 && USB_CFG_DEVICE_NAME_LEN |
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#undef USB_CFG_DESCR_PROPS_STRING_DEVICE |
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#define USB_CFG_DESCR_PROPS_STRING_DEVICE 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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#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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USB_CFG_VENDOR_ID, /* 2 bytes */ |
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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_DEVICE != 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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#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 + (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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USBATTR_SELFPOWER, /* attributes */ |
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#else |
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USBATTR_BUSPOWER, /* 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, /* 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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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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}; |
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#endif |
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/* We don't use prog_int or prog_int16_t for compatibility with various libc |
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* versions. Here's an other compatibility hack: |
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*/ |
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#ifndef PRG_RDB |
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#define PRG_RDB(addr) pgm_read_byte(addr) |
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#endif |
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typedef union{ |
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unsigned word; |
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uchar *ptr; |
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uchar bytes[2]; |
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}converter_t; |
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/* We use this union to do type conversions. This is better optimized than |
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* type casts in gcc 3.4.3 and much better than using bit shifts to build |
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* ints from chars. Byte ordering is not a problem on an 8 bit platform. |
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*/ |
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/* ------------------------------------------------------------------------- */ |
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#if USB_CFG_HAVE_INTRIN_ENDPOINT |
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void usbSetInterrupt(uchar *data, uchar len) |
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{ |
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uchar *p, 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 0 /* No runtime checks! Caller is responsible for valid data! */ |
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if(len > 8) /* interrupt transfers are limited to 8 bytes */ |
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len = 8; |
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#endif |
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if(usbTxLen1 & 0x10){ /* packet buffer was empty */ |
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usbTxBuf1[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */ |
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}else{ |
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usbTxLen1 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */ |
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} |
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p = usbTxBuf1 + 1; |
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for(i=len;i--;) |
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*p++ = *data++; |
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usbCrc16Append(&usbTxBuf1[1], len); |
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usbTxLen1 = len + 4; /* len must be given including sync byte */ |
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DBG2(0x21, usbTxBuf1, len + 3); |
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} |
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#endif |
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#if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
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void usbSetInterrupt3(uchar *data, uchar len) |
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{ |
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uchar *p, i; |
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if(usbTxLen3 & 0x10){ /* packet buffer was empty */ |
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usbTxBuf3[0] ^= USBPID_DATA0 ^ USBPID_DATA1; /* toggle token */ |
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}else{ |
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usbTxLen3 = USBPID_NAK; /* avoid sending outdated (overwritten) interrupt data */ |
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} |
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p = usbTxBuf3 + 1; |
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for(i=len;i--;) |
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*p++ = *data++; |
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usbCrc16Append(&usbTxBuf3[1], len); |
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usbTxLen3 = len + 4; /* len must be given including sync byte */ |
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DBG2(0x23, usbTxBuf3, len + 3); |
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} |
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#endif |
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static uchar usbRead(uchar *data, uchar len) |
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{ |
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#if USB_CFG_IMPLEMENT_FN_READ |
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if(usbMsgFlags & USB_FLG_USE_DEFAULT_RW){ |
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#endif |
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uchar i = len, *r = usbMsgPtr; |
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if(usbMsgFlags & USB_FLG_MSGPTR_IS_ROM){ /* ROM data */ |
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while(i--){ |
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uchar c = PRG_RDB(r); /* assign to char size variable to enforce byte ops */ |
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*data++ = c; |
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r++; |
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} |
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}else{ /* RAM data */ |
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while(i--) |
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*data++ = *r++; |
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} |
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usbMsgPtr = r; |
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return len; |
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#if USB_CFG_IMPLEMENT_FN_READ |
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}else{ |
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if(len != 0) /* don't bother app with 0 sized reads */ |
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return usbFunctionRead(data, len); |
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return 0; |
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} |
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#endif |
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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 &= ~USB_FLG_MSGPTR_IS_ROM; \ |
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if((cfgProp) & USB_PROP_IS_DYNAMIC){ \ |
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replyLen = usbFunctionDescriptor(rq); \ |
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}else{ \ |
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replyData = (uchar *)(staticName); \ |
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SET_REPLY_LEN((cfgProp) & 0xff); \ |
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} \ |
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} |
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/* We use if() instead of #if in the macro above because #if can't be used |
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* in macros and the compiler optimizes constant conditions anyway. |
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*/ |
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/* Don't make this function static to avoid inlining. |
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* The entire function would become too large and exceed the range of |
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* relative jumps. |
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* 2006-02-25: Either gcc 3.4.3 is better than the gcc used when the comment |
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* above was written, or other parts of the code have changed. We now get |
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* better results with an inlined function. Test condition: PowerSwitch code. |
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*/ |
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static void usbProcessRx(uchar *data, uchar len) |
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{ |
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usbRequest_t *rq = (void *)data; |
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uchar replyLen = 0, flags = USB_FLG_USE_DEFAULT_RW; |
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/* We use if() cascades because the compare is done byte-wise while switch() |
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* is int-based. The if() cascades are therefore more efficient. |
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*/ |
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/* usbRxToken can be: |
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* 0x2d 00101101 (USBPID_SETUP for endpoint 0) |
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* 0xe1 11100001 (USBPID_OUT for endpoint 0) |
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* 0xff 11111111 (USBPID_OUT for endpoint 1) |
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*/ |
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DBG2(0x10 + ((usbRxToken >> 1) & 3), data, len); /* SETUP0=12; OUT0=10; OUT1=13 */ |
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#if USB_CFG_IMPLEMENT_FN_WRITEOUT |
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if(usbRxToken == 0xff){ |
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usbFunctionWriteOut(data, len); |
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return; /* no reply expected, hence no usbMsgPtr, usbMsgFlags, usbMsgLen set */ |
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} |
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#endif |
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if(usbRxToken == (uchar)USBPID_SETUP){ |
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usbTxLen = USBPID_NAK; /* abort pending transmit */ |
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if(len == 8){ /* Setup size must be always 8 bytes. Ignore otherwise. */ |
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uchar type = rq->bmRequestType & USBRQ_TYPE_MASK; |
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if(type == USBRQ_TYPE_STANDARD){ |
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#define SET_REPLY_LEN(len) replyLen = (len); usbMsgPtr = replyData |
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/* This macro ensures that replyLen and usbMsgPtr are always set in the same way. |
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* That allows optimization of common code in if() branches */ |
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uchar *replyData = usbTxBuf + 9; /* there is 3 bytes free space at the end of the buffer */ |
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replyData[0] = 0; /* common to USBRQ_GET_STATUS and USBRQ_GET_INTERFACE */ |
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if(rq->bRequest == USBRQ_GET_STATUS){ /* 0 */ |
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uchar __attribute__((__unused__)) 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 |
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if(recipient == USBRQ_RCPT_DEVICE) |
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|
339 |
replyData[0] = USB_CFG_IS_SELF_POWERED; |
|
|
340 |
#endif |
|
|
341 |
#if USB_CFG_HAVE_INTRIN_ENDPOINT && USB_CFG_IMPLEMENT_HALT |
|
|
342 |
if(recipient == USBRQ_RCPT_ENDPOINT && rq->wIndex.bytes[0] == 0x81) /* request status for endpoint 1 */ |
|
|
343 |
replyData[0] = usbTxLen1 == USBPID_STALL; |
|
|
344 |
#endif |
|
|
345 |
replyData[1] = 0; |
|
|
346 |
SET_REPLY_LEN(2); |
|
|
347 |
}else if(rq->bRequest == USBRQ_SET_ADDRESS){ /* 5 */ |
|
|
348 |
usbNewDeviceAddr = rq->wValue.bytes[0]; |
|
|
349 |
}else if(rq->bRequest == USBRQ_GET_DESCRIPTOR){ /* 6 */ |
|
|
350 |
flags = USB_FLG_MSGPTR_IS_ROM | USB_FLG_USE_DEFAULT_RW; |
|
|
351 |
if(rq->wValue.bytes[1] == USBDESCR_DEVICE){ /* 1 */ |
|
|
352 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_DEVICE, usbDescriptorDevice) |
|
|
353 |
}else if(rq->wValue.bytes[1] == USBDESCR_CONFIG){ /* 2 */ |
|
|
354 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_CONFIGURATION, usbDescriptorConfiguration) |
|
|
355 |
}else if(rq->wValue.bytes[1] == USBDESCR_STRING){ /* 3 */ |
|
|
356 |
#if USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC |
|
|
357 |
if(USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_RAM) |
|
|
358 |
flags &= ~USB_FLG_MSGPTR_IS_ROM; |
|
|
359 |
replyLen = usbFunctionDescriptor(rq); |
|
|
360 |
#else /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ |
|
|
361 |
if(rq->wValue.bytes[0] == 0){ /* descriptor index */ |
|
|
362 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_0, usbDescriptorString0) |
|
|
363 |
}else if(rq->wValue.bytes[0] == 1){ |
|
|
364 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_VENDOR, usbDescriptorStringVendor) |
|
|
365 |
}else if(rq->wValue.bytes[0] == 2){ |
|
|
366 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_DEVICE, usbDescriptorStringDevice) |
|
|
367 |
}else if(rq->wValue.bytes[0] == 3){ |
|
|
368 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_STRING_SERIAL_NUMBER, usbDescriptorStringSerialNumber) |
|
|
369 |
}else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ |
|
|
370 |
replyLen = usbFunctionDescriptor(rq); |
|
|
371 |
} |
|
|
372 |
#endif /* USB_CFG_DESCR_PROPS_STRINGS & USB_PROP_IS_DYNAMIC */ |
|
|
373 |
}else if(rq->wValue.bytes[1] == USBDESCR_HID){ /* 0x21 */ |
|
|
374 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID, usbDescriptorConfiguration + 18) |
|
|
375 |
}else if(rq->wValue.bytes[1] == USBDESCR_HID_REPORT){ /* 0x22 */ |
|
|
376 |
GET_DESCRIPTOR(USB_CFG_DESCR_PROPS_HID_REPORT, usbDescriptorHidReport) |
|
|
377 |
}else if(USB_CFG_DESCR_PROPS_UNKNOWN & USB_PROP_IS_DYNAMIC){ |
|
|
378 |
replyLen = usbFunctionDescriptor(rq); |
|
|
379 |
} |
|
|
380 |
}else if(rq->bRequest == USBRQ_GET_CONFIGURATION){ /* 8 */ |
|
|
381 |
replyData = &usbConfiguration; /* send current configuration value */ |
|
|
382 |
SET_REPLY_LEN(1); |
|
|
383 |
}else if(rq->bRequest == USBRQ_SET_CONFIGURATION){ /* 9 */ |
|
|
384 |
usbConfiguration = rq->wValue.bytes[0]; |
|
|
385 |
#if USB_CFG_IMPLEMENT_HALT |
|
|
386 |
usbTxLen1 = USBPID_NAK; |
|
|
387 |
#endif |
|
|
388 |
}else if(rq->bRequest == USBRQ_GET_INTERFACE){ /* 10 */ |
|
|
389 |
SET_REPLY_LEN(1); |
|
|
390 |
#if USB_CFG_HAVE_INTRIN_ENDPOINT |
|
|
391 |
}else if(rq->bRequest == USBRQ_SET_INTERFACE){ /* 11 */ |
|
|
392 |
USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
393 |
# if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
|
|
394 |
USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
395 |
# endif |
|
|
396 |
# if USB_CFG_IMPLEMENT_HALT |
|
|
397 |
usbTxLen1 = USBPID_NAK; |
|
|
398 |
}else if(rq->bRequest == USBRQ_CLEAR_FEATURE || rq->bRequest == USBRQ_SET_FEATURE){ /* 1|3 */ |
|
|
399 |
if(rq->wValue.bytes[0] == 0 && rq->wIndex.bytes[0] == 0x81){ /* feature 0 == HALT for endpoint == 1 */ |
|
|
400 |
usbTxLen1 = rq->bRequest == USBRQ_CLEAR_FEATURE ? USBPID_NAK : USBPID_STALL; |
|
|
401 |
USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
402 |
# if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
|
|
403 |
USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
404 |
# endif |
|
|
405 |
} |
|
|
406 |
# endif |
|
|
407 |
#endif |
|
|
408 |
}else{ |
|
|
409 |
/* the following requests can be ignored, send default reply */ |
|
|
410 |
/* 1: CLEAR_FEATURE, 3: SET_FEATURE, 7: SET_DESCRIPTOR */ |
|
|
411 |
/* 12: SYNCH_FRAME */ |
|
|
412 |
} |
|
|
413 |
#undef SET_REPLY_LEN |
|
|
414 |
}else{ /* not a standard request -- must be vendor or class request */ |
|
|
415 |
replyLen = usbFunctionSetup(data); |
|
|
416 |
} |
|
|
417 |
#if USB_CFG_IMPLEMENT_FN_READ || USB_CFG_IMPLEMENT_FN_WRITE |
|
|
418 |
if(replyLen == 0xff){ /* use user-supplied read/write function */ |
|
|
419 |
if((rq->bmRequestType & USBRQ_DIR_MASK) == USBRQ_DIR_DEVICE_TO_HOST){ |
|
|
420 |
replyLen = rq->wLength.bytes[0]; /* IN transfers only */ |
|
|
421 |
} |
|
|
422 |
flags &= ~USB_FLG_USE_DEFAULT_RW; /* we have no valid msg, use user supplied read/write functions */ |
|
|
423 |
}else /* The 'else' prevents that we limit a replyLen of 0xff to the maximum transfer len. */ |
|
|
424 |
#endif |
|
|
425 |
if(!rq->wLength.bytes[1] && replyLen > rq->wLength.bytes[0]) /* limit length to max */ |
|
|
426 |
replyLen = rq->wLength.bytes[0]; |
|
|
427 |
} |
|
|
428 |
/* make sure that data packets which are sent as ACK to an OUT transfer are always zero sized */ |
|
|
429 |
}else{ /* DATA packet from out request */ |
|
|
430 |
#if USB_CFG_IMPLEMENT_FN_WRITE |
|
|
431 |
if(!(usbMsgFlags & USB_FLG_USE_DEFAULT_RW)){ |
|
|
432 |
uchar rval = usbFunctionWrite(data, len); |
|
|
433 |
replyLen = 0xff; |
|
|
434 |
if(rval == 0xff){ /* an error occurred */ |
|
|
435 |
usbMsgLen = 0xff; /* cancel potentially pending data packet for ACK */ |
|
|
436 |
usbTxLen = USBPID_STALL; |
|
|
437 |
}else if(rval != 0){ /* This was the final package */ |
|
|
438 |
replyLen = 0; /* answer with a zero-sized data packet */ |
|
|
439 |
} |
|
|
440 |
flags = 0; /* start with a DATA1 package, stay with user supplied write() function */ |
|
|
441 |
} |
|
|
442 |
#endif |
|
|
443 |
} |
|
|
444 |
usbMsgFlags = flags; |
|
|
445 |
usbMsgLen = replyLen; |
|
|
446 |
} |
|
|
447 |
|
|
|
448 |
/* ------------------------------------------------------------------------- */ |
|
|
449 |
|
|
|
450 |
static void usbBuildTxBlock(void) |
|
|
451 |
{ |
|
|
452 |
uchar wantLen, len, txLen, token; |
|
|
453 |
|
|
|
454 |
wantLen = usbMsgLen; |
|
|
455 |
if(wantLen > 8) |
|
|
456 |
wantLen = 8; |
|
|
457 |
usbMsgLen -= wantLen; |
|
|
458 |
token = USBPID_DATA1; |
|
|
459 |
if(usbMsgFlags & USB_FLG_TX_PACKET) |
|
|
460 |
token = USBPID_DATA0; |
|
|
461 |
usbMsgFlags++; |
|
|
462 |
len = usbRead(usbTxBuf + 1, wantLen); |
|
|
463 |
if(len <= 8){ /* valid data packet */ |
|
|
464 |
usbCrc16Append(&usbTxBuf[1], len); |
|
|
465 |
txLen = len + 4; /* length including sync byte */ |
|
|
466 |
if(len < 8) /* a partial package identifies end of message */ |
|
|
467 |
usbMsgLen = 0xff; |
|
|
468 |
}else{ |
|
|
469 |
txLen = USBPID_STALL; /* stall the endpoint */ |
|
|
470 |
usbMsgLen = 0xff; |
|
|
471 |
} |
|
|
472 |
usbTxBuf[0] = token; |
|
|
473 |
usbTxLen = txLen; |
|
|
474 |
DBG2(0x20, usbTxBuf, txLen-1); |
|
|
475 |
} |
|
|
476 |
|
|
|
477 |
static inline uchar isNotSE0(void) |
|
|
478 |
{ |
|
|
479 |
uchar rval; |
|
|
480 |
/* We want to do |
|
|
481 |
* return (USBIN & USBMASK); |
|
|
482 |
* here, but the compiler does int-expansion acrobatics. |
|
|
483 |
* We can avoid this by assigning to a char-sized variable. |
|
|
484 |
*/ |
|
|
485 |
rval = USBIN & USBMASK; |
|
|
486 |
return rval; |
|
|
487 |
} |
|
|
488 |
|
|
|
489 |
/* ------------------------------------------------------------------------- */ |
|
|
490 |
|
|
|
491 |
void usbPoll(void) |
|
|
492 |
{ |
|
|
493 |
uchar len, i; |
|
|
494 |
|
|
|
495 |
if((len = usbRxLen) > 0){ |
|
|
496 |
/* We could check CRC16 here -- but ACK has already been sent anyway. If you |
|
|
497 |
* need data integrity checks with this driver, check the CRC in your app |
|
|
498 |
* code and report errors back to the host. Since the ACK was already sent, |
|
|
499 |
* retries must be handled on application level. |
|
|
500 |
* unsigned crc = usbCrc16(buffer + 1, usbRxLen - 3); |
|
|
501 |
*/ |
|
|
502 |
usbProcessRx(usbRxBuf + USB_BUFSIZE + 1 - usbInputBufOffset, len - 3); |
|
|
503 |
#if USB_CFG_HAVE_FLOWCONTROL |
|
|
504 |
if(usbRxLen > 0) /* only mark as available if not inactivated */ |
|
|
505 |
usbRxLen = 0; |
|
|
506 |
#else |
|
|
507 |
usbRxLen = 0; /* mark rx buffer as available */ |
|
|
508 |
#endif |
|
|
509 |
} |
|
|
510 |
if(usbTxLen & 0x10){ /* transmit system idle */ |
|
|
511 |
if(usbMsgLen != 0xff){ /* transmit data pending? */ |
|
|
512 |
usbBuildTxBlock(); |
|
|
513 |
} |
|
|
514 |
} |
|
|
515 |
for(i = 10; i > 0; i--){ |
|
|
516 |
if(isNotSE0()) |
|
|
517 |
break; |
|
|
518 |
} |
|
|
519 |
if(i == 0){ /* RESET condition, called multiple times during reset */ |
|
|
520 |
usbNewDeviceAddr = 0; |
|
|
521 |
usbDeviceAddr = 0; |
|
|
522 |
#if USB_CFG_IMPLEMENT_HALT |
|
|
523 |
usbTxLen1 = USBPID_NAK; |
|
|
524 |
#if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
|
|
525 |
usbTxLen3 = USBPID_NAK; |
|
|
526 |
#endif |
|
|
527 |
#endif |
|
|
528 |
DBG1(0xff, 0, 0); |
|
|
529 |
} |
|
|
530 |
} |
|
|
531 |
|
|
|
532 |
/* ------------------------------------------------------------------------- */ |
|
|
533 |
|
|
|
534 |
void usbInit(void) |
|
|
535 |
{ |
|
|
536 |
#if USB_INTR_CFG_SET != 0 |
|
|
537 |
USB_INTR_CFG |= USB_INTR_CFG_SET; |
|
|
538 |
#endif |
|
|
539 |
#if USB_INTR_CFG_CLR != 0 |
|
|
540 |
USB_INTR_CFG &= ~(USB_INTR_CFG_CLR); |
|
|
541 |
#endif |
|
|
542 |
USB_INTR_ENABLE |= (1 << USB_INTR_ENABLE_BIT); |
|
|
543 |
#if USB_CFG_HAVE_INTRIN_ENDPOINT |
|
|
544 |
USB_SET_DATATOKEN1(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
545 |
# if USB_CFG_HAVE_INTRIN_ENDPOINT3 |
|
|
546 |
USB_SET_DATATOKEN3(USBPID_DATA0); /* reset data toggling for interrupt endpoint */ |
|
|
547 |
# endif |
|
|
548 |
#endif |
|
|
549 |
} |
|
|
550 |
|
|
|
551 |
/* ------------------------------------------------------------------------- */ |