/*
 * blinky.c
 *
 * Copyright 2014 Edward V. Emelianoff <eddy@sao.ru>
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */
#include "ports_definition.h"
#include "interrupts.h"
#include "uart.h"
#include "onewire.h"

volatile unsigned long Global_time = 0L; // global time in ms
U16 paused_val = 500; // interval between LED flashing
volatile U8 waitforread = 0;

// show received scrtchpad
void show_received_data(){
	char i;
//	uart_write("show_received_data()\n");
	for(i = 8; i > -1; i--){
		if(i < 8) UART_send_byte(',');
		printUHEX(ow_data_array[i]);
	}
	ow_process_resdata = NULL;
	uart_write("\nTemp: ");
	print_long(gettemp());
	uart_write("dergC\n");
}

// ask to read N bytes after temper request
void send_read_seq(){
//	uart_write("send_read_seq()\n");
	onewire_receive_bytes(9);
	ow_process_resdata = show_received_data;
}

void wait_reading(){
//	uart_write("wait_reading()\n");
	waitforread = 1;
	ow_process_resdata = NULL;
}

int main() {
	unsigned long T = 0L;
//	int Ival;
	U8 rb;
	CFG_GCR |= 1; // disable SWIM
	// Configure clocking
	CLK_CKDIVR = 0; // F_HSI = 16MHz, f_CPU = 16MHz

// Timer 4 (8 bit) used as system tick timer
	// prescaler == 128 (2^7), Tfreq = 125kHz
	// period = 1ms, so ARR = 125
	TIM4_PSCR = 7;
	TIM4_ARR = 125;
	// interrupts: update
	TIM4_IER = TIM_IER_UIE;
	// auto-reload + interrupt on overflow + enable
	TIM4_CR1 = TIM_CR1_APRE | TIM_CR1_URS | TIM_CR1_CEN;

	// PC2 - PP output (on-board LED)
	PORT(LED_PORT, DDR)  |= LED_PIN;
	PORT(LED_PORT, CR1)  |= LED_PIN;

	uart_init();

	onewire_setup();

	// enable all interrupts
	enableInterrupts();

	// Loop
	do{
		if((Global_time - T > paused_val) || (T > Global_time)){
			T = Global_time;
			PORT(LED_PORT, ODR) ^= LED_PIN; // blink on-board LED
			if(!OW_CONVERSION_DONE) uart_write("conversion in process\n");
		}
		process_onewire();
		if(UART_read_byte(&rb)){ // buffer isn't empty
			switch(rb){
				case 'h': // help
				case 'H':
					uart_write("\nPROTO:\n+/-\tLED period\nS/s\tset/get Mspeed\n"
					"r: reset 1-wire\n"
					"w: read temper\n");
				break;
				case '+':
					paused_val += 100;
					if(paused_val > 10000)
						paused_val = 500; // but not more than 10s
				break;
				case '-':
					paused_val -= 100;
					if(paused_val < 500)  // but not less than 0.5s
						paused_val = 500;
				break;
				case 'r':
					if(!onewire_reset()) uart_write("not ");
					uart_write("found 1-wire devices (echo len: ");
					print_long((long)onewire_gotlen);
					uart_write(")\n");
				break;
				case 'w':
					if(!onewire_reset()){
						uart_write("no devices found!");
						break;
					}
					ow_data_array[0] = OW_CONVERT_T;
					ow_data_array[1] = OW_SKIP_ROM;
					ow_process_resdata = wait_reading;
					onewire_send_bytes(2);
				break;
			}
		}
		if(waitforread){
			if(OW_CONVERSION_DONE){
				if(onewire_reset()){
					waitforread = 0;
					ow_process_resdata = send_read_seq;
					ow_data_array[0] = OW_READ_SCRATCHPAD;
					ow_data_array[1] = OW_SKIP_ROM;
					onewire_send_bytes(2);
				}else uart_write("error reseting!");
			}
		}
	}while(1);
}