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; version 2 of the License.
11 This program is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
24 * Unix-style sleep/wakeup scheduling
25 * Strict round-robin, no priorities
27 uint8_t ao_sleep(void *wchan)
29 Puts current task to sleep. Will wake up when wchan is
30 signalled (returning 0), or when an alarm has expired
33 void ao_wakeup(void *wchan)
35 Wakeup all tasks sleeping on wchan
37 void ao_add_task(struct ao_task *task, void (*start)(void))
39 Adds a task to the queue of available tasks
41 void ao_start_scheduler(void)
43 Invokes the scheduler, starting the operating system
47 Switches to another task which is ready to run. Allows
48 tasks which want to run for a while to give up the CPU
49 without needing to sleep
51 void ao_panic(uint8_t reason)
53 Any fatal error should call this function, which can
54 display the error code in some cryptic fashion.
56 void ao_wake_task(struct ao_task *task)
58 Wake the task as if the wchan it is waiting on had
61 void ao_alarm(uint16_t delay)
63 Queue an alarm to expire 'delay' ticks in the future.
64 The alarm will cause the task to wake from ao_sleep
65 and return 1. Alarms are cancelled if the task is
66 awoken by ao_wakeup or ao_wake_task.
70 Stop the current task and remove it from the list of
75 * Regular timer ticks (at 100Hz, by default)
76 * All time values are in ticks
78 uint16_t ao_time(void)
80 Returns the curent tick count
82 void ao_delay(uint16_t delay)
84 Suspend task execution for 'delay' ticks.
88 * Static DMA entry allocation
90 uint8_t ao_dma_alloc(uint8_t *done)
92 Allocates one of the 5 DMA units on the cc1111
93 processor. When this DMA unit is finished, it will
94 set *done to 1 and wakeup anyone waiting on that.
96 void ao_dma_set_transfer(uint8_t id, void *src, void *dst,
97 uint16_t count, uint8_t cfg0, uint8_t cfg1)
99 Prepares the specified DMA unit for operation.
101 void ao_dma_start(uint8_t id)
103 Start DMA on the specified channel.
105 void ao_dma_trigger(uint8_t id)
107 Manually trigger a DMA channel
109 void ao_dma_abort(uint8_t id)
111 Abort a pending DMA transfer, signalling
112 that by setting the associated 'done' to
113 AO_DMA_ABORTED and waking any task