'------ Li-Ion Battery Management System Watchdog Chip -------
'------ Picbasic Pro  Compiler version PIC12F683 - 110610 - V02 Beta ----------
'------ This code is for the Watchdog chip on the Master boards
'------ Please report any errors or problems. 
'------------------------------------------------------------------------------

'**************************** General Information ******************************

'The BMS modules carry no warranty or guarantee of any kind! They are used at
'your own risk, and I make no claims as to their suitability for a particular
'function. Prospective users must evaluate the system before using it, and no
'liability will be entertained by myself in any shape or form whatsoever.
'The modules and software have been produced at low cost for the benefit of
'the EV & electronic community. The software is available free via the internet.
'Users may modify or adapt the system as they see fit. If you are not fully
'competent to work on potentially lethal battery systems and high voltages,
'then do not experiment with or use this system. Be aware that vehicle
'modifications can lead to invalidated insurance and warranty issues. You the
'end user remain fully liable for any modifications made to your vehicle.   

'************************* Watchdog PIC12F683 Pinouts **************************

'                                    Top					
'                                   _____
'(+ Supply)                  +Ve -1|  ^  |8- -Ve                    (- Supply)
'(Not Used)             Output 5 -2|  6  |7- Output 0               (Not Used)
'(Watchdog Led Out)     Output 4 -3|  8  |6- Output 1      (Audible Alarm Out)
'(Pulse Count In)        Input 3 -4|  3  |5- Output 2       (Master Reset Out) 
'                                   ----- 

'********************** Watchdog Module Specification **************************

'Supply Voltage 5.00V DC same as Master
'Average Supply Current at 5.00v <100ua
'CPU Speed 4mhz with internal resonator 

'*******************************************************************************
'********************** Program Size 961 out of 2048 Words *********************
'*******************************************************************************

'------------------------------ General configuration --------------------------

@ DEVICE PIC12F683,MCLR_OFF
@ DEVICE PIC12F683,BOD_OFF
@ DEVICE PIC12F683,PROTECT_OFF
@ DEVICE PIC12F683,WDT_ON

	'osccon = %01000000  ' Osc set to 1 MHz
	'osccon = %01010000  ' Osc set to 2 MHz
	'osccon = %01100000  ' Osc set to 4 MHz (Default)
	'osccon = %01110000  ' Osc set to 8 MHz

	
	Define OSC 4			'Set processor speed to 4 Mhz  
	INTCON = %10001000     	 	'Internal oscillator
	OSCCON = %01100111		'Sets internal osc to 4 Mhz (Default) and stable
	CMCON0 = %00000111     	 	'Comparators off
	GPIO   = %00000000       	'Outputs low
	TRISIO = %00001000     		'Set Pin GPIO.3 as Input
	ANSEL  = %00000000 		'Make sure Analog functions are turned OFF (should not be needed)
	ADCON0 = %00000000	        'A/D off    

    	
'*******************************************************************************

'Variables Constants and I/O definitions

'------------------------ Variables 16bit --------------------------------------

Pulses		var Word		'Number of WatchDog pulses received in 1 min

'--------------------------- Constants -----------------------------------------

Time		con 65500		'Timer set to 65 seconds approx
MinPulses 	con 1			'Minimum number of pulses allowed	

'---------------- Pins used for I/O and designations -------------------------
'------------------ Digital high/low Inputs/Outputs ------------------------

Alarm		var GPIO.1		'Audible Alarm Warning on Output 1
MasterReset	var GPIO.2		'Master Reset on Output 2

Led		var GPIO.4		'Warning Led on Output 4

'---------------- Analogue ADC Inputs ------------------------------

WatchDog	var GPIO.3		'Watchdog pulses input on Input 3


'*******************************************************************************

	
Start:	
	high MasterReset		 'Deactivate Master Reset Output [Pull High] (Note pcb jumper setting)	
	count WatchDog, Time, Pulses	 'Count Watchdog pulses recieved in 65 seconds
	if Pulses > MinPulses then Start 'If Pulses received > MinPulses then goto program start

	high Alarm 			 'Activate Audible alarm	
	high Led			 'Activate WatchDog alarm dashboard Led
	low MasterReset			 'Activate Master Reset Output [Pull Low] (Note pcb jumper setting)
	pause 2000			 'Pause for 2 seconds to allow Master Reset
	goto Start			 'Goto program start