/* ChibiOS/RT - Copyright (C) 2006-2007 Giovanni Di Sirio. This file is part of ChibiOS/RT. ChibiOS/RT is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. ChibiOS/RT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ /** * @page article_timing Reliable timings using Threads * One common task is to have threads do something at regular, scheduled, * intervals. * An obvious solution is to write something like this: * @code msg_t my_thread(void *param) { while (TRUE) { do_something(); chThdSleepMilliseconds(1000); /* Fixed interval */ } } * @endcode * This example works well assuming that @p do_something() execution time is * well below the system tick period and that @p my_thread() is not preempted * by other threads inserting long intervals.
* If the above conditions are not satisfied you may have @p do_something() * executed at irregular intervals, as example:

* T0...T0+1000...T0+2002...T0+3002...T0+4005...etc.

* Also note that the error increases over time and this kind of behavior can * lead to anomalies really hard to debug. *

A better solution

* It is possible to rewrite the above code using absolute deadlines rather * than fixed intervals: * @code msg_t my_thread(void *param) { systick_t time = chTimeNow(); /* T0 */ while (TRUE) { time += MS2ST(1000); /* Next deadline */ do_something(); chThdSleepUntil(time); } } * @endcode * Using this code @p do_something() will always be executed at an absolute * deadline time and the error will not accumulate over time regardless of * the execution time and delays inserted by other threads. */ ge'>range
path: root/tmk_core/protocol/vusb.mk
blob: 897b833e1a7d741323794624f26baa4ddbbbb453 (plain) 
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VUSB_DIR = protocol/vusb

OPT_DEFS += -DPROTOCOL_VUSB

SRC +=	$(VUSB_DIR)/main.c \
	$(VUSB_DIR)/vusb.c \
	$(VUSB_DIR)/usbdrv/usbdrv.c \
	$(VUSB_DIR)/usbdrv/usbdrvasm.S \
	$(VUSB_DIR)/usbdrv/oddebug.c


ifdef NO_UART
SRC +=	$(COMMON_DIR)/sendchar_null.c
else
SRC +=	$(COMMON_DIR)/sendchar_uart.c \
	$(COMMON_DIR)/uart.c
endif


# Search Path
VPATH += $(TMK_PATH)/$(VUSB_DIR)
VPATH += $(TMK_PATH)/$(VUSB_DIR)/usbdrv
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-07 11:37:23 +0000