/* FILE / DATE: dcf_sim_.c / 2010-05-03
DESCRIPTION: DCF Simulator
MICRO-PROCESSOR: PIC16F886
COMPILER: B Knudsen Cc5x C-compiler - not ANSI-C
EXTERNAL HW: LCD Display
4 pushbuttons with LED
Rotating encoder
2 LEDs
DESIGNER: Hans Sundgren
CREDIT: William Sandqvist for rotary encoder reading
RAM usage: 172 bytes (12 local), 196 bytes free
CODE WORDS: 4450 code words (54 %)
CHIP CONNECTIONS ********************************************
_________ ________
| \/ |
| 16F886 |
-|RE3 1 28 RB7|-
Output.PULSE--<-|RA0 2 27 RB6|-
LCD.backlight-<-|RA1 3 26 RB5|-<-Btn.START
LED.SET------<-|RA2 4 25 RB4|-<-Btn.TRANSMIT
LED.VIEW-----<-|RA3 5 24 RB3|-<-Btn.VIEW
LED.TRANSMIT-<-|RA4 6 23 RB2|-<-Btn.SET
LED.START----<-|RA5 7 22 RB1|-<-Encoder.A
GND---|Vss 8 21 RB0|-<-Encoder.B
LED.one-<-|RA7 9 20 Vdd|---+5V
LED.null-<-|RA6 10 19 Vss|---GND
XTAL 32,768 kHz---|OSO 11 18 RC7|->-LCD.D7
XTAL 32,768 kHz---|OSI 12 17 RC6|->-LCD.D6
LCD.RS-<-|RC2 13 16 RC5|->-LCD.D5
LCD.EN-<-|RC3 14 15 RC4|->-LCD.D4
|___________________|
DISPLAY VIEWS, 1 -> 2 -> 3 -> 4 -> 1 -> ...
_____________________________________________
| View | Shows | LCD backlight |
|------|----------------------|---------------|
| 1 | Time and bit display | No |
| 2 | Time and bit display | Yes |
| 3 | Bit overview | Yes |
| 4 | Bit description | Yes |
|______|______________________|_______________|
PUSH-BUTTONS
____________________________________________________________
| Button | Color | Pin | Lamp, pin: lit |
|------------|--------|-----|--------------------------------|
| Start/Stop | Green | RB5 | RA5 | On during clock running |
| Transmit | Red | RB4 | RA4 | Blink on output signal |
| View | Blue | RB3 | RA3 | Blink when pressed |
| Set | Yellow | RB2 | RA2 | On during set clock |
|____________|________|_____|________________________________|
LED INDICATORS
____________________________________________________________
| LED | Color | Pin | Lit during... |
|------------|--------|-----|--------------------------------|
| 0 | Yellow | RA7 | Output = 0 |
| | | | Decrement during clock setting |
| | | | |
| 1 | Green | RA6 | Output = 1 |
| | | | Increment during clock setting |
|____________|________|_____|________________________________|
ROTATING DIALS
____________________________________________________________
| Type | Function | Pin |
|----------------|-------------------------------------------|
| Rotary encoder | Increase/decrease clock setting | RB0/RB1 |
|________________|_________________________________|_________|
PROGRAM OVERVIEW *******************************************
Interrupt: 1 Hz ----------------------------------------
| If start_mode = 1 |
| Update clock (step up one second) |
| Output pulse-value |
| Update display |
| Check buttons |
| If VIEW-button |
| Step up display mode 0->1->2->3->0 |
| If SET-button |
| Setting > 0 |
| Stop interrupt, jump out to setting sequence |
--------------------------------------------------------
Interrupt: Rotary encoder, during "set clock" ----------
| Read encoder |
| If increase |
| up = 1 and blink LED0 |
| If decrease |
| down = 1 and blink LED1 |
--------------------------------------------------------
Main ---------------------------------------------------
| Initialization |
| Read stored time from EEPROM |
| Interrupt is active 1 Hz, but the clock is stopped |
| Loop |
| Check START-button |
| If START-button |
| Toggle start_mode |
--------------------------------------------------------
Set clock sequence ------------------------------------
| Disable 1 Hz interrupt |
| Enable rotary encoder interrupt |
| Step through set sequence, read rotary encoder |
| Update and display time values |
| Store set time in EEPROM |
| Enable 1 Hz interrupt |
--------------------------------------------------------
*/