121 lines
3.5 KiB
C
121 lines
3.5 KiB
C
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/*
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* Copyright (c) 2008 Swedish Institute of Computer Science
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, 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 ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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*
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* \brief
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* This controls the sleep operation for the LCD.
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*
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* \author
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* Mike Vidales mavida404@gmail.com
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*
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*/
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#include <avr/interrupt.h>
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#include <avr/sleep.h>
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#include <avr/wdt.h>
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#include <stdbool.h>
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#include "sleep.h"
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#include "uart.h"
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/**
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* \addtogroup lcd
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* \{
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*/
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/*---------------------------------------------------------------------------*/
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/**
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* \brief Prepares for and executes sleep. This function sets up the
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* processor to enter sleep mode, and to wake up when the joystick
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* button (PE2/PCINT2) is pressed.
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*/
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void
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sleep_now(void)
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{
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/* Disable watchdog */
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wdt_disable();
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/* Setup sleep mode */
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set_sleep_mode(SLEEP_MODE_PWR_DOWN);
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/* Enable wakeup interrupt */
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EIMSK |= (1 << PCIE0);
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/* Enable PCINT2 as interrupt */
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PCMSK0 |= (1 << PCINT2);
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/* Go to sleep now */
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sleep_mode();
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/* Disable the interrupt for the enter button */
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EIMSK &= ~(1 << PCIE0);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This will send a single character forever to the ATmega1284p to cause a wakeup.
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*
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* The 1284p polls the USART for new data during each sleep cycle. Upon receiving a
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* character from the user LCD, it will wake up and send an acknowledgement frame.
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*/
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void
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sleep_wakeup(void)
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{
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/* First, clear the input buffer and get any chars waiting */
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while(rx_char_ready()){
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uart_get_char_rx();
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}
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/* Flood 1284p with serial chars until it responds. */
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for(;;){
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uart_send_byte('x');
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if (rx_char_ready())
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break;
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}
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/* Get a frame back */
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uart_serial_rcv_frame(true);
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}
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/*---------------------------------------------------------------------------*/
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/**
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* \brief This is the wake up button interrupt. When this interrupt fires,
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* nothing is done. The program will simply continue from the end of the sleep
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* command.
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*/
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ISR
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(PCINT0_vect)
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{
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}
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/** \} */
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