From f70553106707e3496d07eecb83f0c0a1acad7f77 Mon Sep 17 00:00:00 2001 From: Keith Packard Date: Sun, 23 Oct 2011 14:51:32 -0700 Subject: altos: Add battery voltage sampling driver For devices without a full ADC compliment, this just samples the battery pin and converts to mV. Signed-off-by: Keith Packard --- src/cc1111/ao_battery.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 src/cc1111/ao_battery.c (limited to 'src/cc1111') diff --git a/src/cc1111/ao_battery.c b/src/cc1111/ao_battery.c new file mode 100644 index 00000000..070f682f --- /dev/null +++ b/src/cc1111/ao_battery.c @@ -0,0 +1,60 @@ +/* + * Copyright © 2011 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" +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) 3333 >> 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]); +} -- cgit v1.2.3