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/*
* spreadspace avr utils
*
*
* Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
* Othmar Gsenger <otti@gsenger.com>
*
* This file is part of spreadspace avr utils.
*
* spreadspace avr utils is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* spreadspace avr utils is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with spreadspace avr utils. If not, see <http://www.gnu.org/licenses/>.
*/
#include <avr/io.h>
#include <avr/wdt.h>
#include <avr/interrupt.h>
#include <avr/power.h>
#include <stdio.h>
#include "util.h"
#include "led.h"
#include "usbio.h"
/*
this program listens on a usb serial/acm interface. When the send command ('s')
is received the send buffer gets filled with the next 3 bytes. These bites are
sent out serialized to a specified port using PWM. Before the data is sent, a
sync bit is sent. The data is repeated multiple times.
This version of the program is optimized for 433MHz radio controlled power plugs.
To control them you need to add a ASK modulator to the output pin (default F0).
*/
// RF433 Sender is Connected to PF0
#define SEND_PORT PORTF
#define SEND_DDR DDRF
#define SEND_SERIAL 0
// Logical Zero (Sender turned off) is when output is low
#define SEND_ZERO 1
// rf433 command length is 3 bytes
#define SEND_CMD_LENGTH 3
// pwm is SEND_PWM_BASE timers high and SEND_PWN_LONG_MULT * SEND_PWM_BASE timers low for a low bit (low bit = low is longer)
#define SEND_PWM_BASE 1
#define SEND_PWN_LONG_MULT 3
#define SEND_PWN_SYNC_MULT 31
//bits are read LSB from first byte first
#define SEND_CURRENT_BIT (send_cmd_buffer[send_cmd_buffer_bit_pos/8] & (1<< (send_cmd_buffer_bit_pos % 8 )))
static char send_cmd_buffer[SEND_CMD_LENGTH];
static int8_t send_cmd_buffer_bit_pos=0;
static uint8_t send_pwm_remain=0;
static uint8_t send_pwm_output=0;
static uint8_t send_repeat=0;
static uint8_t send_sync=0;
static inline void sender_on(void)
{
if(SEND_ZERO)
SEND_PORT |= (1 << SEND_SERIAL);
else
SEND_PORT &= ~(1 << SEND_SERIAL);
send_pwm_output=1;
}
static inline void sender_off(void)
{
if(SEND_ZERO)
SEND_PORT &= ~(1 << SEND_SERIAL);
else
SEND_PORT |= (1 << SEND_SERIAL);
send_pwm_output=0;
}
inline void sender_toggle(void)
{
SEND_PORT ^= (1 << SEND_SERIAL);
}
void sender_timer_enable(void)
{
TCCR0A = 1<<WGM01;
OCR0A = 22; // (1+17)*16us = 352us
TCCR0B = 1<<CS02 | 0<<CS01| 0<<CS00; //Teiler 256
TCNT0 = 0;
TIMSK0 |= (1<<OCIE0A);
}
inline void sender_timer_disable(void)
{
TCCR0B =0;
TIMSK0 &= ~(1<<OCIE0A);
}
inline uint8_t sender_timer_status(void)
{
return (TIMSK0 & (1<<OCIE0A))>>OCIE0A;
}
ISR(TIMER0_COMPA_vect)
{
PORTF^=2; //debug;
if(send_cmd_buffer_bit_pos < SEND_CMD_LENGTH * 8) {
if(send_pwm_remain)
{
//NOTHING
} else if (send_sync) {
sender_off();
send_pwm_remain=SEND_PWM_BASE*SEND_PWN_SYNC_MULT;
send_sync=0;
send_cmd_buffer_bit_pos=-1;
} else if (send_pwm_output) {
sender_off();
if(SEND_CURRENT_BIT)
{
send_pwm_remain=SEND_PWM_BASE;
} else {
send_pwm_remain=SEND_PWM_BASE*SEND_PWN_LONG_MULT;
}
} else {
send_cmd_buffer_bit_pos++;
sender_on();
if(SEND_CURRENT_BIT)
{
send_pwm_remain=SEND_PWM_BASE*SEND_PWN_LONG_MULT;
} else {
send_pwm_remain=SEND_PWM_BASE;
}
}
send_pwm_remain--;
} else {
send_cmd_buffer_bit_pos=0;
send_pwm_remain=0;
if(send_repeat)
{
send_repeat--;
send_sync=1;
send_pwm_remain=SEND_PWM_BASE;
sender_on();
} else {
sender_timer_disable();
sender_off();
}
}
}
void pins_init(void)
{
sender_off();
SEND_DDR |= 1 << SEND_SERIAL;
DDRF |= 2; //DEBUG
}
void timer_init(void)
{
}
static uint8_t command_pos=0;
void handle_cmd(uint8_t cmd)
{
if (!command_pos)
{
switch(cmd) {
case '0': led_off(); break;
case '1': led_on(); break;
case 't': led_toggle(); break;
case 'r': reset2bootloader(); break;
case 's':
printf("Expecting multibyte command now\n\r");
command_pos=1;
break;
default: printf("error\n\r"); return;
}
printf("ok\n\r");
} else {
send_cmd_buffer[command_pos-1]=cmd;
if (command_pos==SEND_CMD_LENGTH)
{
printf("Enabling Timer\n\r");
command_pos=0;
send_sync=1;
send_pwm_remain=SEND_PWM_BASE;
send_repeat=15;
sender_on();
sender_timer_enable();
}
else
command_pos++;
}
}
int main(void)
{
MCUSR &= ~(1 << WDRF);
wdt_disable();
cpu_init();
led_init();
usbio_init();
pins_init();
timer_init();
sei();
for(;;) {
int16_t BytesReceived = usbio_bytes_received();
while(BytesReceived > 0) {
int16_t ReceivedByte = fgetc(stdin);
if(ReceivedByte != EOF) {
handle_cmd(ReceivedByte);
}
BytesReceived--;
}
usbio_task();
}
}
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