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/*
* Copyright © 2011 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; 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"
static __data union {
uint8_t d[2];
int16_t v;
} ao_battery_value;
void
ao_battery_isr(void) ao_arch_interrupt(1)
{
ao_battery_value.d[0] = ADCL;
ao_battery_value.d[1] = ADCH;
ao_wakeup(DATA_TO_XDATA(&ao_battery_value));
}
uint16_t
ao_battery_get(void)
{
ao_arch_critical(
ADCCON3 = ADCCON3_EREF_VDD | ADCCON3_EDIV_512 | BATTERY_PIN;
ao_sleep(DATA_TO_XDATA(&ao_battery_value));
);
return (uint16_t) ((int32_t) ao_battery_value.v * (int32_t) 4950 >> 15);
}
static void
ao_battery_show(void)
{
printf("Battery: %u mV\n", ao_battery_get());
}
__code struct ao_cmds ao_battery_cmds[] = {
{ ao_battery_show, "B\0Show battery voltage" },
{ 0, NULL },
};
void
ao_battery_init(void)
{
ADCCFG = (1 << BATTERY_PIN);
ADCIF = 0;
IEN0 |= IEN0_ADCIE;
ao_cmd_register(&ao_battery_cmds[0]);
}
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