cloudbase.mooo.com Git - z180-stamp.git/blame_incremental

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Commit	Line	Data
	1	/*
	2	* (C) Copyright 2014 Leo C. <erbl259-lmu@yahoo.de>
	3	*
	4	* SPDX-License-Identifier: GPL-2.0+
	5	*/
	6
	7	#include "common.h"
	8	#include <avr/interrupt.h>
	9	#include <util/atomic.h>
	10	#include "time.h"
	11	#include "timer.h"
	12
	13	/* timer interrupt/overflow counter */
	14	/* counts up every ms. */
	15	static volatile
	16	uint32_t timestamp;
	17
	18	/*
	19	* 1000Hz timer interrupt generated by OC3A
	20	*/
	21	ISR(TIMER3_COMPA_vect)
	22	{
	23	static int_fast8_t tick_10ms;
	24	static int_fast8_t tick_1s;
	25	int_fast8_t i, j;
	26
	27	extern void disk_timerproc(void);
	28
	29	timestamp++;
	30
	31	i = tick_10ms + 1;
	32	if (i == 10) {
	33	Stat \|= S_10MS_TO;
	34
	35	/* Drive timer procedure of low level disk I/O module */
	36	disk_timerproc();
	37
	38	j = tick_1s - 1;
	39	if (j == 0) {
	40	system_tick();
	41	j = 100;
	42	}
	43	tick_1s = j;
	44	i = 0;
	45	}
	46	tick_10ms = i;
	47	}
	48
	49
	50	/--------------------------------------------------------------------------/
	51
	52	#if 0
	53	void timer_setup(void)
	54	{
	55
	56	/* Clock */
	57	CLKPR = _BV(CLKPCE);
	58	CLKPR = 0;
	59
	60	/* Timer */
	61
	62	OCR1A = F_CPU / 1000 - 1; // Timer1: 1000Hz interval (OC1A)
	63	TCCR1B = 0b00001001;
	64	TIMSK1 = _BV(OCIE1A); // Enable TC1.oca interrupt
	65	}
	66	#endif
	67
	68	/--------------------------------------------------------------------------/
	69
	70	uint32_t get_timer(uint32_t base)
	71	{
	72	uint32_t ret;
	73	ATOMIC_BLOCK(ATOMIC_FORCEON)
	74	{
	75	ret = timestamp;
	76	}
	77	return ret - base;
	78	}