1 AltOS - 8051 operating system for Altus-Metrum projects
5 Copyright © 2009 Keith Packard <keithp@keithp.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 General Public License for more details.
17 You should have received a copy of the GNU General Public License along
18 with this program; if not, write to the Free Software Foundation, Inc.,
19 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
25 * Unix-style sleep/wakeup scheduling
26 * Strict round-robin, no priorities
28 uint8_t ao_sleep(void *wchan)
30 Puts current task to sleep. Will wake up when wchan is
31 signalled (returning 0), or when an alarm has expired
34 void ao_wakeup(void *wchan)
36 Wakeup all tasks sleeping on wchan
38 void ao_add_task(struct ao_task *task, void (*start)(void))
40 Adds a task to the queue of available tasks
42 void ao_start_scheduler(void)
44 Invokes the scheduler, starting the operating system
48 Switches to another task which is ready to run. Allows
49 tasks which want to run for a while to give up the CPU
50 without needing to sleep
52 void ao_panic(uint8_t reason)
54 Any fatal error should call this function, which can
55 display the error code in some cryptic fashion.
57 void ao_wake_task(struct ao_task *task)
59 Wake the task as if the wchan it is waiting on had
62 void ao_alarm(uint16_t delay)
64 Queue an alarm to expire 'delay' ticks in the future.
65 The alarm will cause the task to wake from ao_sleep
66 and return 1. Alarms are cancelled if the task is
67 awoken by ao_wakeup or ao_wake_task.
71 Stop the current task and remove it from the list of
76 * Regular timer ticks (at 100Hz, by default)
77 * All time values are in ticks
79 uint16_t ao_time(void)
81 Returns the curent tick count
83 void ao_delay(uint16_t delay)
85 Suspend task execution for 'delay' ticks.
89 * Static DMA entry allocation
91 uint8_t ao_dma_alloc(uint8_t *done)
93 Allocates one of the 5 DMA units on the cc1111
94 processor. When this DMA unit is finished, it will
95 set *done to 1 and wakeup anyone waiting on that.
97 void ao_dma_set_transfer(uint8_t id, void *src, void *dst,
98 uint16_t count, uint8_t cfg0, uint8_t cfg1)
100 Prepares the specified DMA unit for operation.
102 void ao_dma_start(uint8_t id)
104 Start DMA on the specified channel.
106 void ao_dma_trigger(uint8_t id)
108 Manually trigger a DMA channel
110 void ao_dma_abort(uint8_t id)
112 Abort a pending DMA transfer, signalling
113 that by setting the associated 'done' to
114 AO_DMA_ABORTED and waking any task