freakusb/hw/at90usbxx6_7/hw.c

   1 /*******************************************************************
   2     Copyright (C) 2008 FreakLabs
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License along
  15     with this program; if not, write to the Free Software Foundation, Inc.,
  16     51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17
  18     Please post support questions to the FreakLabs forum.
  19 *******************************************************************/
  20 /*!
  21     \defgroup hw_at90usb Hardware - AT90USB
  22     \file hw.c
  23     \ingroup hw_at90usb
  24 */
  25 /*******************************************************************/
  26 #include <avr/io.h>
  27 #include <avr/interrupt.h>
  28 #include <avr/wdt.h>
  29 #include <avr/pgmspace.h>
  30 #include "at90usb.h"
  31 #include "types.h"
  32
  33 /**************************************************************************/
  34 /*!
  35     Initialize the hardware.
  36     1) Turn off the watchdog timer (in AVR MCUs)
  37     2) Configure the PLL
  38     3) Enable the USB and relevant peripherals
  39     4) Enable the global interrupt.
  40 */
  41 /**************************************************************************/
  42 void hw_init()
  43 {
  44     MCUSR &= ~(1 << WDRF);
  45     wdt_disable();
  46
  47 #ifndef AT90USB16
  48     SET_DEVICE_MODE();
  49
  50     // config PLL and turn it on
  51     PLLCSR  = (1 << PLLP1) | (1 << PLLP0);
  52     PLLCSR |= (1 << PLLE);
  53     while (!PLL_LOCKED);
  54
  55     // enable the USB block
  56     USBCON |= ((1 << USBE) | (1 << OTGPADE));
  57
  58     // unfreeze the clock
  59     USBCON &= ~(1 << FRZCLK);
  60
  61     // set the speed
  62     UDCON &= ~(1 << LSM);
  63
  64     // set the interrupts: vbus, suspend, and end of reset
  65     USBCON |= (1 << VBUSTE);
  66     UDIEN  |= (1 << SUSPE) | (1 << EORSTE);
  67 #else
  68     // set the interrupts: vbus, suspend, and end of reset
  69     UDIEN  |= (_BV(SUSPE) | _BV(EORSTE));
  70
  71     // enable vbus sense pin
  72     VBUS_SENSE_DDR  &= ~_BV(VBUS_SENSE_IO);
  73     VBUS_SENSE_PORT &= ~_BV(VBUS_SENSE_IO);
  74
  75     // enable the vbus sense interrupt
  76     PCICR |= _BV(PCIE0);
  77
  78     // disable the usb interface
  79     USBCON &= ~_BV(USBE);
  80
  81     // enable the usb interface
  82     USBCON |= _BV(USBE);
  83 #endif
  84
  85     // turn on the global interrupts
  86     sei();
  87 }
  88
  89 /**************************************************************************/
  90 /*!
  91     Returns a byte stored in the flash. Some MCUs can't access the flash
  92     memory from a standard pointer so they need a special function to handle it.
  93 */
  94 /**************************************************************************/
  95 U8 hw_flash_get_byte(U8 *addr)
  96 {
  97     return pgm_read_byte(addr);
  98 }
  99
 100 /**************************************************************************/
 101 /*!
 102     Disable global interrupts
 103 */
 104 /**************************************************************************/
 105 void hw_intp_disable()
 106 {
 107     cli();
 108 }
 109
 110 /**************************************************************************/
 111 /*!
 112     Enable global interrupts
 113 */
 114 /**************************************************************************/
 115 void hw_intp_enable()
 116 {
 117     sei();
 118 }