timer.h File Reference

#include "types.h"

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Macros
#define	T0_TOP   255
#define	T0_RELOAD   0xb1
#define	T0_INC20   25
#define	IV_1S   1202
#define	BTN_DN   (PINB & _BV(PINB2))
#define	BTN_UP   (PINB & _BV(PINB1))
#define	DEBOUNCED_S   130
#define	DEBOUNCED_L   8 * DEBOUNCED_S
#define	BTN_TEMP_DELTA   100
#define	ENG_RUN_CW   PORTB |= _BV(PB4)
#define	ENG_STOP_CW   PORTB &= ~_BV(PB4)
#define	ENG_RUN_CCW   PORTB |= _BV(PB3)
#define	ENG_STOP_CCW   PORTB &= ~_BV(PB3)
#define	OVM_MSR   8

Functions
void	TimerInit (void)
	initialize timer resource period: 32µs More...
	ISR (TIMER0_COMPA_vect)
	compare match interrupt service for OCR0A More...
BTN_CODE	DecodeButton (void)
	identify whether a (and which) button is pressed or not More...
UCHAR	GetTenthSec (void)
	interface to get the global tenth seconds More...
UCHAR	gMov (void)
	return minute overflow counter More...
void	sMov (UCHAR mov)
	set minute overflow counter More...

Macro Definition Documentation

#define BTN_DN   (PINB & _BV(PINB2))

addressing the value of down button from input pin

Definition at line 24 of file timer.h.

Referenced by DecodeButton().

#define BTN_TEMP_DELTA   100

delta temperature which takes place on a single button press [m°C]

Definition at line 40 of file timer.h.

#define BTN_UP   (PINB & _BV(PINB1))

addressing the value of up button from input pin

Definition at line 28 of file timer.h.

Referenced by DecodeButton().

#define DEBOUNCED_L   8 * DEBOUNCED_S

number of timer increments to realize a long debounce delay

Definition at line 36 of file timer.h.

Referenced by DecodeButton().

#define DEBOUNCED_S   130

number of timer increments to realize a short debounce delay

Definition at line 32 of file timer.h.

Referenced by DecodeButton().

#define ENG_RUN_CCW   PORTB |= _BV(PB3)

translation of engine mode ENG_RUN_CCW to proper output signals

Definition at line 52 of file timer.h.

Referenced by ControlEngine().

#define ENG_RUN_CW   PORTB |= _BV(PB4)

translation of engine mode ENG_RUN_CW to proper output signals

Definition at line 44 of file timer.h.

Referenced by ControlEngine().

#define ENG_STOP_CCW   PORTB &= ~_BV(PB3)

translation of engine mode ENG_STOP_CCW to proper output signals

Definition at line 56 of file timer.h.

Referenced by ControlEngine(), and ISR().

#define ENG_STOP_CW   PORTB &= ~_BV(PB4)

translation of engine mode ENG_STOP_CW to proper output signals

Definition at line 48 of file timer.h.

Referenced by ControlEngine(), and ISR().

#define IV_1S   1202

number of timer overflows till 1 second

Definition at line 20 of file timer.h.

Referenced by ISR().

#define OVM_MSR   8

number of minute overflows, source for MEASSET recording

Definition at line 60 of file timer.h.

Referenced by main().

#define T0_INC20   25

number of required timer increments to get a resolution of 833µs

Definition at line 16 of file timer.h.

Referenced by EnableUsi(), ISR(), and TimerInit().

#define T0_RELOAD   0xb1

adjust timer overflow period to 20ms

Definition at line 12 of file timer.h.

#define T0_TOP   255

highest countable value @ 8 bit resolution

Definition at line 8 of file timer.h.

Function Documentation

BTN_CODE DecodeButton

(

void

)

identify whether a (and which) button is pressed or not

Parameters

btnOff

offset value, indicates the action which is active dependent on the press duration

Returns

button code which identifies the operation pattern (button(s) pressed/not pressed)

Definition at line 119 of file timer.c.

References BC_DN, BC_DNUP, BC_DNUP_L, BC_NONE, BC_UP, BTN_DN, BTN_UP, DEBOUNCED_L, DEBOUNCED_S, FALSE, g_debouncer, TRUE, UCHAR, and UINT.

Referenced by main().

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UCHAR GetTenthSec

(

void

)

interface to get the global tenth seconds

Returns

tenth seconds

Definition at line 192 of file timer.c.

References g_s100.

Referenced by PrintPage().

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UCHAR gMov

(

void

)

return minute overflow counter

Returns

minute overflow counter

Definition at line 200 of file timer.c.

References g_mov.

Referenced by main().

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ISR

(

TIMER0_COMPA_vect

)

compare match interrupt service for OCR0A

Parameters

TIMER0_COMPA_vect

desired compare match interrupt vector

counter to count a tenth of a second

counter to count one second

Definition at line 72 of file timer.c.

References ENG_TIMER::allow, CM_MEAS, ENG_TIMER::cnt, ENG_TIMER::em, EM_STOP, ENG_STOP_CCW, ENG_STOP_CW, FALSE, g_ctm, g_debouncer, g_min, g_mov, g_s100, g_sec, IV_1S, NUM_MS, T0_INC20, UCHAR, and UINT.

void sMov

(

UCHAR

mov

)

set minute overflow counter

Parameters

mov	overflow value to set

Definition at line 208 of file timer.c.

References g_mov.

Referenced by main().

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void TimerInit

(

void

)

initialize timer resource
period: 32µs

TCCR0B <- Timer/Counter0 Control Register B
| - | - | - | TSM [0] | PSR0 [0] | CS02 [1] | CS01 [0] | CS00 [0] |
clock selection:
CS02:CS00, we need a clkio division of 256

enable compare match mode

T0 match value (to get 20ms period)

enable compare match A interrupt

no PLL used

Definition at line 38 of file timer.c.

References CTC0, T0_INC20, and TCC_R0.

Referenced by Init().

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