594 lines
17 KiB
C
594 lines
17 KiB
C
/* USB Keyboard Example for Teensy USB Development Board
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* http://www.pjrc.com/teensy/usb_keyboard.html
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* Copyright (c) 2009 PJRC.COM, LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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// Version 1.0: Initial Release
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// Version 1.1: Add support for Teensy 2.0
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#define USB_SERIAL_PRIVATE_INCLUDE
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#include "usb_keyboard.h"
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/**************************************************************************
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*
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* Configurable Options
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*
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**************************************************************************/
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// You can change these to give your code its own name.
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#define STR_MANUFACTURER L"unspecified" // TODO
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#define STR_PRODUCT L"ErgoDox ergonomic keyboard"
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// Mac OS-X and Linux automatically load the correct drivers. On
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// Windows, even though the driver is supplied by Microsoft, an
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// INF file is needed to load the driver. These numbers need to
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// match the INF file.
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#define VENDOR_ID 0x1d50 // Openmoko, Inc.
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#define PRODUCT_ID 0x6028 // ErgoDox ergonomic keyboard
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// USB devices are supposed to implment a halt feature, which is
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// rarely (if ever) used. If you comment this line out, the halt
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// code will be removed, saving 102 bytes of space (gcc 4.3.0).
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// This is not strictly USB compliant, but works with all major
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// operating systems.
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#define SUPPORT_ENDPOINT_HALT
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/**************************************************************************
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*
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* Endpoint Buffer Configuration
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*
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**************************************************************************/
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#define ENDPOINT0_SIZE 32
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#define KEYBOARD_INTERFACE 0
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#define KEYBOARD_ENDPOINT 3
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#define KEYBOARD_SIZE 8
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#define KEYBOARD_BUFFER EP_DOUBLE_BUFFER
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static const uint8_t PROGMEM endpoint_config_table[] = {
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0,
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0,
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1, EP_TYPE_INTERRUPT_IN, EP_SIZE(KEYBOARD_SIZE) | KEYBOARD_BUFFER,
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0
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};
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/**************************************************************************
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*
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* Descriptor Data
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*
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**************************************************************************/
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// Descriptors are the data that your computer reads when it auto-detects
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// this USB device (called "enumeration" in USB lingo). The most commonly
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// changed items are editable at the top of this file. Changing things
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// in here should only be done by those who've read chapter 9 of the USB
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// spec and relevant portions of any USB class specifications!
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static uint8_t PROGMEM device_descriptor[] = {
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18, // bLength
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1, // bDescriptorType
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0x00, 0x02, // bcdUSB
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0, // bDeviceClass
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0, // bDeviceSubClass
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0, // bDeviceProtocol
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ENDPOINT0_SIZE, // bMaxPacketSize0
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LSB(VENDOR_ID), MSB(VENDOR_ID), // idVendor
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LSB(PRODUCT_ID), MSB(PRODUCT_ID), // idProduct
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0x00, 0x01, // bcdDevice
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1, // iManufacturer
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2, // iProduct
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0, // iSerialNumber
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1 // bNumConfigurations
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};
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// Keyboard Protocol 1, HID 1.11 spec, Appendix B, page 59-60
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static uint8_t PROGMEM keyboard_hid_report_desc[] = {
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0x05, 0x01, // Usage Page (Generic Desktop),
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0x09, 0x06, // Usage (Keyboard),
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0xA1, 0x01, // Collection (Application),
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0x75, 0x01, // Report Size (1),
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0x95, 0x08, // Report Count (8),
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0x05, 0x07, // Usage Page (Key Codes),
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0x19, 0xE0, // Usage Minimum (224),
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0x29, 0xE7, // Usage Maximum (231),
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0x15, 0x00, // Logical Minimum (0),
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0x25, 0x01, // Logical Maximum (1),
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0x81, 0x02, // Input (Data, Variable, Absolute), ;Modifier byte
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0x95, 0x01, // Report Count (1),
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0x75, 0x08, // Report Size (8),
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0x81, 0x03, // Input (Constant), ;Reserved byte
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0x95, 0x05, // Report Count (5),
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0x75, 0x01, // Report Size (1),
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0x05, 0x08, // Usage Page (LEDs),
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0x19, 0x01, // Usage Minimum (1),
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0x29, 0x05, // Usage Maximum (5),
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0x91, 0x02, // Output (Data, Variable, Absolute), ;LED report
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0x95, 0x01, // Report Count (1),
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0x75, 0x03, // Report Size (3),
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0x91, 0x03, // Output (Constant), ;LED report padding
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0x95, 0x06, // Report Count (6),
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0x75, 0x08, // Report Size (8),
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0x15, 0x00, // Logical Minimum (0),
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0x25, 0x68, // Logical Maximum(104),
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0x05, 0x07, // Usage Page (Key Codes),
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0x19, 0x00, // Usage Minimum (0),
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0x29, 0x68, // Usage Maximum (104),
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0x81, 0x00, // Input (Data, Array),
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0xc0 // End Collection
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};
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#define CONFIG1_DESC_SIZE (9+9+9+7)
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#define KEYBOARD_HID_DESC_OFFSET (9+9)
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static uint8_t PROGMEM config1_descriptor[CONFIG1_DESC_SIZE] = {
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// configuration descriptor, USB spec 9.6.3, page 264-266, Table 9-10
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9, // bLength;
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2, // bDescriptorType;
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LSB(CONFIG1_DESC_SIZE), // wTotalLength
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MSB(CONFIG1_DESC_SIZE),
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1, // bNumInterfaces
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1, // bConfigurationValue
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0, // iConfiguration
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0xC0, // bmAttributes
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50, // bMaxPower
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// interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
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9, // bLength
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4, // bDescriptorType
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KEYBOARD_INTERFACE, // bInterfaceNumber
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0, // bAlternateSetting
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1, // bNumEndpoints
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0x03, // bInterfaceClass (0x03 = HID)
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0x01, // bInterfaceSubClass (0x01 = Boot)
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0x01, // bInterfaceProtocol (0x01 = Keyboard)
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0, // iInterface
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// HID interface descriptor, HID 1.11 spec, section 6.2.1
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9, // bLength
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0x21, // bDescriptorType
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0x11, 0x01, // bcdHID
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0, // bCountryCode
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1, // bNumDescriptors
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0x22, // bDescriptorType
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sizeof(keyboard_hid_report_desc), // wDescriptorLength
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0,
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// endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
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7, // bLength
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5, // bDescriptorType
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KEYBOARD_ENDPOINT | 0x80, // bEndpointAddress
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0x03, // bmAttributes (0x03=intr)
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KEYBOARD_SIZE, 0, // wMaxPacketSize
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1 // bInterval
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};
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// If you're desperate for a little extra code memory, these strings
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// can be completely removed if iManufacturer, iProduct, iSerialNumber
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// in the device desciptor are changed to zeros.
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struct usb_string_descriptor_struct {
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uint8_t bLength;
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uint8_t bDescriptorType;
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int16_t wString[];
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};
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static struct usb_string_descriptor_struct PROGMEM string0 = {
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4,
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3,
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{0x0409}
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};
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static struct usb_string_descriptor_struct PROGMEM string1 = {
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sizeof(STR_MANUFACTURER),
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3,
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STR_MANUFACTURER
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};
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static struct usb_string_descriptor_struct PROGMEM string2 = {
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sizeof(STR_PRODUCT),
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3,
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STR_PRODUCT
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};
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// This table defines which descriptor data is sent for each specific
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// request from the host (in wValue and wIndex).
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static struct descriptor_list_struct {
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uint16_t wValue;
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uint16_t wIndex;
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const uint8_t *addr;
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uint8_t length;
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} PROGMEM descriptor_list[] = {
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{0x0100, 0x0000, device_descriptor, sizeof(device_descriptor)},
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{0x0200, 0x0000, config1_descriptor, sizeof(config1_descriptor)},
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{0x2200, KEYBOARD_INTERFACE, keyboard_hid_report_desc, sizeof(keyboard_hid_report_desc)},
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{0x2100, KEYBOARD_INTERFACE, config1_descriptor+KEYBOARD_HID_DESC_OFFSET, 9},
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{0x0300, 0x0000, (const uint8_t *)&string0, 4},
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{0x0301, 0x0409, (const uint8_t *)&string1, sizeof(STR_MANUFACTURER)},
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{0x0302, 0x0409, (const uint8_t *)&string2, sizeof(STR_PRODUCT)}
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};
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#define NUM_DESC_LIST (sizeof(descriptor_list)/sizeof(struct descriptor_list_struct))
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/**************************************************************************
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*
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* Variables - these are the only non-stack RAM usage
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*
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**************************************************************************/
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// zero when we are not configured, non-zero when enumerated
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static volatile uint8_t usb_configuration=0;
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// which modifier keys are currently pressed
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// 1=left ctrl, 2=left shift, 4=left alt, 8=left gui
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// 16=right ctrl, 32=right shift, 64=right alt, 128=right gui
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uint8_t keyboard_modifier_keys=0;
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// which keys are currently pressed, up to 6 keys may be down at once
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uint8_t keyboard_keys[6]={0,0,0,0,0,0};
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// protocol setting from the host. We use exactly the same report
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// either way, so this variable only stores the setting since we
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// are required to be able to report which setting is in use.
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static uint8_t keyboard_protocol=1;
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// the idle configuration, how often we send the report to the
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// host (ms * 4) even when it hasn't changed
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static uint8_t keyboard_idle_config=125;
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// count until idle timeout
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static uint8_t keyboard_idle_count=0;
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// 1=num lock, 2=caps lock, 4=scroll lock, 8=compose, 16=kana
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volatile uint8_t keyboard_leds=0;
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/**************************************************************************
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*
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* Public Functions - these are the API intended for the user
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*
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**************************************************************************/
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// initialize USB
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void usb_init(void)
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{
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HW_CONFIG();
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USB_FREEZE(); // enable USB
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PLL_CONFIG(); // config PLL
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while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
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USB_CONFIG(); // start USB clock
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UDCON = 0; // enable attach resistor
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usb_configuration = 0;
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UDIEN = (1<<EORSTE)|(1<<SOFE);
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sei();
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}
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// return 0 if the USB is not configured, or the configuration
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// number selected by the HOST
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uint8_t usb_configured(void)
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{
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return usb_configuration;
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}
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// perform a single keystroke
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int8_t usb_keyboard_press(uint8_t key, uint8_t modifier)
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{
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int8_t r;
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keyboard_modifier_keys = modifier;
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keyboard_keys[0] = key;
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r = usb_keyboard_send();
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if (r) return r;
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keyboard_modifier_keys = 0;
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keyboard_keys[0] = 0;
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return usb_keyboard_send();
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}
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// send the contents of keyboard_keys and keyboard_modifier_keys
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int8_t usb_keyboard_send(void)
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{
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uint8_t i, intr_state, timeout;
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if (!usb_configuration) return -1;
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intr_state = SREG;
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cli();
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UENUM = KEYBOARD_ENDPOINT;
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timeout = UDFNUML + 50;
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while (1) {
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// are we ready to transmit?
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if (UEINTX & (1<<RWAL)) break;
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SREG = intr_state;
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// has the USB gone offline?
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if (!usb_configuration) return -1;
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// have we waited too long?
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if (UDFNUML == timeout) return -1;
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// get ready to try checking again
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intr_state = SREG;
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cli();
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UENUM = KEYBOARD_ENDPOINT;
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}
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UEDATX = keyboard_modifier_keys;
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UEDATX = 0;
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for (i=0; i<6; i++) {
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UEDATX = keyboard_keys[i];
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}
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UEINTX = 0x3A;
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keyboard_idle_count = 0;
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SREG = intr_state;
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return 0;
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}
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/**************************************************************************
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*
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* Private Functions - not intended for general user consumption....
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*
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**************************************************************************/
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// USB Device Interrupt - handle all device-level events
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// the transmit buffer flushing is triggered by the start of frame
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//
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ISR(USB_GEN_vect)
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{
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uint8_t intbits, i; // used to declare a variable `t` as well, but it
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// wasn't used ::Ben Blazak, 2012::
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static uint8_t div4=0;
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intbits = UDINT;
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UDINT = 0;
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if (intbits & (1<<EORSTI)) {
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UENUM = 0;
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UECONX = 1;
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UECFG0X = EP_TYPE_CONTROL;
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UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
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UEIENX = (1<<RXSTPE);
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usb_configuration = 0;
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}
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if ((intbits & (1<<SOFI)) && usb_configuration) {
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if (keyboard_idle_config && (++div4 & 3) == 0) {
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UENUM = KEYBOARD_ENDPOINT;
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if (UEINTX & (1<<RWAL)) {
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keyboard_idle_count++;
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if (keyboard_idle_count == keyboard_idle_config) {
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keyboard_idle_count = 0;
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UEDATX = keyboard_modifier_keys;
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UEDATX = 0;
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for (i=0; i<6; i++) {
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UEDATX = keyboard_keys[i];
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}
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UEINTX = 0x3A;
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}
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}
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}
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}
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}
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// Misc functions to wait for ready and send/receive packets
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static inline void usb_wait_in_ready(void)
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{
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while (!(UEINTX & (1<<TXINI))) ;
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}
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static inline void usb_send_in(void)
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{
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UEINTX = ~(1<<TXINI);
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}
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static inline void usb_wait_receive_out(void)
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{
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while (!(UEINTX & (1<<RXOUTI))) ;
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}
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static inline void usb_ack_out(void)
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{
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UEINTX = ~(1<<RXOUTI);
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}
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// USB Endpoint Interrupt - endpoint 0 is handled here. The
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// other endpoints are manipulated by the user-callable
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// functions, and the start-of-frame interrupt.
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//
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ISR(USB_COM_vect)
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{
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uint8_t intbits;
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const uint8_t *list;
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const uint8_t *cfg;
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uint8_t i, n, len, en;
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uint8_t bmRequestType;
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uint8_t bRequest;
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uint16_t wValue;
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uint16_t wIndex;
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uint16_t wLength;
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uint16_t desc_val;
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const uint8_t *desc_addr;
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uint8_t desc_length;
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UENUM = 0;
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intbits = UEINTX;
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if (intbits & (1<<RXSTPI)) {
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bmRequestType = UEDATX;
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bRequest = UEDATX;
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wValue = UEDATX;
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wValue |= (UEDATX << 8);
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wIndex = UEDATX;
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wIndex |= (UEDATX << 8);
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wLength = UEDATX;
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wLength |= (UEDATX << 8);
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UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
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if (bRequest == GET_DESCRIPTOR) {
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list = (const uint8_t *)descriptor_list;
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for (i=0; ; i++) {
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if (i >= NUM_DESC_LIST) {
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UECONX = (1<<STALLRQ)|(1<<EPEN); //stall
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return;
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}
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desc_val = pgm_read_word(list);
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if (desc_val != wValue) {
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list += sizeof(struct descriptor_list_struct);
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continue;
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}
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list += 2;
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desc_val = pgm_read_word(list);
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if (desc_val != wIndex) {
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list += sizeof(struct descriptor_list_struct)-2;
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continue;
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}
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list += 2;
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desc_addr = (const uint8_t *)pgm_read_word(list);
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list += 2;
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desc_length = pgm_read_byte(list);
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break;
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}
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len = (wLength < 256) ? wLength : 255;
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if (len > desc_length) len = desc_length;
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do {
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// wait for host ready for IN packet
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do {
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i = UEINTX;
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} while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
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if (i & (1<<RXOUTI)) return; // abort
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// send IN packet
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n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
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for (i = n; i; i--) {
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UEDATX = pgm_read_byte(desc_addr++);
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}
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len -= n;
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usb_send_in();
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} while (len || n == ENDPOINT0_SIZE);
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return;
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}
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if (bRequest == SET_ADDRESS) {
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usb_send_in();
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usb_wait_in_ready();
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UDADDR = wValue | (1<<ADDEN);
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return;
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}
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if (bRequest == SET_CONFIGURATION && bmRequestType == 0) {
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usb_configuration = wValue;
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usb_send_in();
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cfg = endpoint_config_table;
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for (i=1; i<5; i++) {
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UENUM = i;
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en = pgm_read_byte(cfg++);
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UECONX = en;
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if (en) {
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UECFG0X = pgm_read_byte(cfg++);
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UECFG1X = pgm_read_byte(cfg++);
|
|
}
|
|
}
|
|
UERST = 0x1E;
|
|
UERST = 0;
|
|
return;
|
|
}
|
|
if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
|
|
usb_wait_in_ready();
|
|
UEDATX = usb_configuration;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
|
|
if (bRequest == GET_STATUS) {
|
|
usb_wait_in_ready();
|
|
i = 0;
|
|
#ifdef SUPPORT_ENDPOINT_HALT
|
|
if (bmRequestType == 0x82) {
|
|
UENUM = wIndex;
|
|
if (UECONX & (1<<STALLRQ)) i = 1;
|
|
UENUM = 0;
|
|
}
|
|
#endif
|
|
UEDATX = i;
|
|
UEDATX = 0;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
#ifdef SUPPORT_ENDPOINT_HALT
|
|
if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
|
|
&& bmRequestType == 0x02 && wValue == 0) {
|
|
i = wIndex & 0x7F;
|
|
if (i >= 1 && i <= MAX_ENDPOINT) {
|
|
usb_send_in();
|
|
UENUM = i;
|
|
if (bRequest == SET_FEATURE) {
|
|
UECONX = (1<<STALLRQ)|(1<<EPEN);
|
|
} else {
|
|
UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
|
|
UERST = (1 << i);
|
|
UERST = 0;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
if (wIndex == KEYBOARD_INTERFACE) {
|
|
if (bmRequestType == 0xA1) {
|
|
if (bRequest == HID_GET_REPORT) {
|
|
usb_wait_in_ready();
|
|
UEDATX = keyboard_modifier_keys;
|
|
UEDATX = 0;
|
|
for (i=0; i<6; i++) {
|
|
UEDATX = keyboard_keys[i];
|
|
}
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == HID_GET_IDLE) {
|
|
usb_wait_in_ready();
|
|
UEDATX = keyboard_idle_config;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == HID_GET_PROTOCOL) {
|
|
usb_wait_in_ready();
|
|
UEDATX = keyboard_protocol;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
}
|
|
if (bmRequestType == 0x21) {
|
|
if (bRequest == HID_SET_REPORT) {
|
|
usb_wait_receive_out();
|
|
keyboard_leds = UEDATX;
|
|
usb_ack_out();
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == HID_SET_IDLE) {
|
|
keyboard_idle_config = (wValue >> 8);
|
|
keyboard_idle_count = 0;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
if (bRequest == HID_SET_PROTOCOL) {
|
|
keyboard_protocol = wValue;
|
|
usb_send_in();
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
|
|
}
|
|
|
|
|