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