AltOS - 8051 operating system for Altus-Metrum projects Copyright and License Copyright © 2009 Keith Packard 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; version 2 of the License. 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.