From ac99982b10fd5772218660137ee21db9b90cd885 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Tue, 14 Apr 2009 14:21:56 -0700 Subject: Add eeprom driver and command loop This involved adding dma control and a mutex implementation. Signed-off-by: Keith Packard --- ao_mutex.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 ao_mutex.c (limited to 'ao_mutex.c') diff --git a/ao_mutex.c b/ao_mutex.c new file mode 100644 index 00000000..12c67960 --- /dev/null +++ b/ao_mutex.c @@ -0,0 +1,41 @@ +/* + * 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. + */ + +#include "ao.h" + +void +ao_mutex_get(__xdata uint8_t *mutex) +{ + if (*mutex == ao_cur_task->task_id) + ao_panic(AO_PANIC_MUTEX); + __critical { + while (*mutex) + ao_sleep(mutex); + *mutex = ao_cur_task->task_id; + } +} + +void +ao_mutex_put(__xdata uint8_t *mutex) +{ + if (*mutex != ao_cur_task->task_id) + ao_panic(AO_PANIC_MUTEX); + __critical { + *mutex = 0; + ao_wakeup(mutex); + } +} -- cgit v1.2.3