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103 lines
2.9 KiB
103 lines
2.9 KiB
13 years ago
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/*
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u8g_state.c
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backup and restore hardware state
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Universal 8bit Graphics Library
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Copyright (c) 2011, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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state callback: backup env U8G_STATE_MSG_BACKUP_ENV
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device callback: DEV_MSG_INIT
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state callback: backup u8g U8G_STATE_MSG_BACKUP_U8G
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state callback: restore env U8G_STATE_MSG_RESTORE_ENV
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state callback: backup env U8G_STATE_MSG_BACKUP_ENV
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state callback: retore u8g U8G_STATE_MSG_RESTORE_U8G
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DEV_MSG_PAGE_FIRST or DEV_MSG_PAGE_NEXT
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state callback: restore env U8G_STATE_MSG_RESTORE_ENV
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*/
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#include <stddef.h>
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#include "u8g.h"
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void u8g_state_dummy_cb(uint8_t msg)
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{
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/* the dummy procedure does nothing */
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}
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void u8g_SetHardwareBackup(u8g_t *u8g, u8g_state_cb backup_cb)
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{
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u8g->state_cb = backup_cb;
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/* in most cases the init message was already sent, so this will backup the */
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/* current u8g state */
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backup_cb(U8G_STATE_MSG_BACKUP_U8G);
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}
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/*===============================================================*/
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/* AVR */
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#if defined(__AVR__)
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#define U8G_ATMEGA_HW_SPI
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/* remove the definition for attiny */
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#if __AVR_ARCH__ == 2
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#undef U8G_ATMEGA_HW_SPI
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#endif
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#if __AVR_ARCH__ == 25
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#undef U8G_ATMEGA_HW_SPI
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#endif
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#endif
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#if defined(U8G_ATMEGA_HW_SPI)
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#include <avr/interrupt.h>
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static uint8_t u8g_state_avr_spi_memory[2];
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void u8g_backup_avr_spi(uint8_t msg)
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{
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if ( U8G_STATE_MSG_IS_BACKUP(msg) )
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{
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u8g_state_avr_spi_memory[U8G_STATE_MSG_GET_IDX(msg)] = SPCR;
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}
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else
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{
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uint8_t tmp = SREG;
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cli();
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SPCR = 0;
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SPCR = u8g_state_avr_spi_memory[U8G_STATE_MSG_GET_IDX(msg)];
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SREG = tmp;
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}
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}
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#endif
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