timer.c File Reference

#include "timer.h"
#include "setup.h"

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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 ()
	return minute overflow counter More...
void	sMov (UCHAR mov)
	set minute overflow counter More...

Variables
UINT volatile	g_debouncer = 0
UCHAR volatile	g_s100 = 0
UCHAR volatile	g_sec = 0
UINT volatile	g_min = 0
UCHAR volatile	g_mov = 0
CTRL_MODE volatile	g_ctm = CM_MEAS
ENG_TIMER volatile	g_et

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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Variable Documentation

CTRL_MODE volatile g_ctm = CM_MEAS

control mode

Definition at line 27 of file timer.c.

Referenced by DoControl(), ISR(), and main().

UINT volatile g_debouncer = 0

debounce counter

Definition at line 7 of file timer.c.

Referenced by DecodeButton(), and ISR().

ENG_TIMER volatile g_et

mixer engine control structure

Definition at line 31 of file timer.c.

UINT volatile g_min = 0

number of minutes

Definition at line 19 of file timer.c.

Referenced by ISR(), and main().

UCHAR volatile g_mov = 0

counter of overflow minutes (depends on number of measurements and the measurement interval IV_MEAS)

Definition at line 23 of file timer.c.

Referenced by gMov(), ISR(), and sMov().

UCHAR volatile g_s100 = 0

number of tenth seconds, range is [0-9]

Definition at line 11 of file timer.c.

Referenced by GetTenthSec(), and ISR().

UCHAR volatile g_sec = 0

number of seconds

Definition at line 15 of file timer.c.

Referenced by ISR(), and main().