Initial Commit - Copy from Altus Metrum AltOS

2024-06-25 19:03:04 +02:00
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+	AltOS - 8051 operating system for Altus-Metrum projects
+
+Copyright and License
+
+	Copyright © 2009 Keith Packard <keithp@keithp.com>
+
+	This program 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 2 of the License, or
+	(at your option) any later version.
+
+	This program 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, write to the Free Software Foundation, Inc.,
+	59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+
+Tasking API:
+
+	 * Multi-tasking
+	 * Non-preemptive
+	 * Unix-style sleep/wakeup scheduling
+	 * Strict round-robin, no priorities
+
+	uint8_t ao_sleep(void *wchan)
+
+		Puts current task to sleep. Will wake up when wchan is
+		signalled (returning 0), or when an alarm has expired
+		(returning 1).
+	
+	void ao_wakeup(void *wchan)
+
+		Wakeup all tasks sleeping on wchan
+
+	void ao_add_task(struct ao_task *task, void (*start)(void))
+
+		Adds a task to the queue of available tasks
+
+	void ao_start_scheduler(void)
+
+		Invokes the scheduler, starting the operating system
+
+	void ao_yield(void)
+
+		Switches to another task which is ready to run. Allows
+		tasks which want to run for a while to give up the CPU
+		without needing to sleep
+
+	void ao_panic(uint8_t reason)
+
+		Any fatal error should call this function, which can
+		display the error code in some cryptic fashion.
+
+	void ao_wake_task(struct ao_task *task)
+
+		Wake the task as if the wchan it is waiting on had
+		been signalled.
+
+	void ao_alarm(uint16_t delay)
+
+		Queue an alarm to expire 'delay' ticks in the future.
+		The alarm will cause the task to wake from ao_sleep
+		and return 1. Alarms are cancelled if the task is
+		awoken by ao_wakeup or ao_wake_task.
+
+	void ao_exit(void)
+
+		Stop the current task and remove it from the list of
+		available tasks.
+
+Timer API
+
+	 * Regular timer ticks (at 100Hz, by default)
+	 * All time values are in ticks
+
+	 uint16_t ao_time(void)
+
+		Returns the curent tick count
+
+	void ao_delay(uint16_t delay)
+
+		Suspend task execution for 'delay' ticks.
+
+DMA API
+
+	 * Static DMA entry allocation
+
+	uint8_t ao_dma_alloc(uint8_t *done)
+
+		Allocates one of the 5 DMA units on the cc1111
+		processor. When this DMA unit is finished, it will
+		set *done to 1 and wakeup anyone waiting on that.
+
+	void ao_dma_set_transfer(uint8_t id, void *src, void *dst,
+				 uint16_t count, uint8_t cfg0, uint8_t cfg1)
+
+		Prepares the specified DMA unit for operation.
+
+	void ao_dma_start(uint8_t id)
+
+		Start DMA on the specified channel.
+
+	void ao_dma_trigger(uint8_t id)
+
+		Manually trigger a DMA channel
+
+	void ao_dma_abort(uint8_t id)
+
+		Abort a pending DMA transfer, signalling
+		that by setting the associated 'done' to
+		AO_DMA_ABORTED and waking any task
+		sleeping on that.