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Philips HDD1630 - working battery voltage readings. Still needs to be calibrated.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@19998 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Mark Arigo 2009-02-13 04:25:09 +00:00
parent 8e5c4ce097
commit 5d5bab7ed4
2 changed files with 22 additions and 16 deletions
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28
firmware/target/arm/philips/hdd1630/powermgmt-hdd1630.c
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@ -24,14 +24,19 @@
#include "adc.h"
#include "powermgmt.h"
#define SMLAL(lo, hi, x, y) \
asm volatile ("smlal %0, %1, %2, %3" \
: "+r" (lo), "+r" (hi) \
: "%r" (x), "r" (y))
const unsigned short battery_level_dangerous[BATTERY_TYPES_COUNT] =
{
3450
3550
};
const unsigned short battery_level_shutoff[BATTERY_TYPES_COUNT] =
{
3400
3500
};
/* voltages (millivolt) of 0%, 10%, ... 100% when charging disabled */
@ -48,19 +53,20 @@ const unsigned short percent_to_volt_charge[11] =
};
#endif /* CONFIG_CHARGING */
#define BATTERY_SCALE_FACTOR 6003
#define BATTERY_SCALE_FACTOR 4200
/* full-scale ADC readout (2^10) in millivolt */
/* adc readout
* max with charger connected: 690
* max fully charged: 682
* min just before shutdown: 570
*/
/* Returns battery voltage from ADC [millivolts] */
unsigned int battery_adc_voltage(void)
{
/* For now, assume as battery full (we need to calibrate) */
/* return (adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR) >> 10; */
return 3990;
/* This may be overly complicated (pulled from the OF) */
int lo = 0;
int val = adc_read(ADC_UNREG_POWER) * BATTERY_SCALE_FACTOR;
SMLAL(lo, val, 0x8a42f871, val);
val>>= 9;
val -= (val >> 31);
return val;
}