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Change internal temperature base from -267.7C to -243.7C. The AXP223

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datasheet says that the value is between -267.7C and 165.8C in steps of 0.1C,
but this doesn't make sense for a 12-bit field. If we take the maximum value
and subtract 4095 we get -243.7C, effectively adding +24C to the reported
temp. On my A31 board, this changes a chilly 15.3C to a more reasonable 39.3C.
This commit is contained in:
jmcneill 2014-11-21 22:31:09 +00:00
parent 9a10d51413
commit fa2843b696
1 changed files with 4 additions and 4 deletions
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8
sys/dev/i2c/axp22x.c
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@ -1,4 +1,4 @@
/* $NetBSD: axp22x.c,v 1.1 2014/10/12 23:58:42 jmcneill Exp $ */
/* $NetBSD: axp22x.c,v 1.2 2014/11/21 22:31:09 jmcneill Exp $ */
/*-
* Copyright (c) 2014 Jared D. McNeill <jmcneill@invisible.ca>
@ -27,7 +27,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: axp22x.c,v 1.1 2014/10/12 23:58:42 jmcneill Exp $");
__KERNEL_RCSID(0, "$NetBSD: axp22x.c,v 1.2 2014/11/21 22:31:09 jmcneill Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -108,8 +108,8 @@ axp22x_sensors_refresh(struct sysmon_envsys *sme, envsys_data_t *edata)
if (error) {
edata->state = ENVSYS_SINVALID;
} else {
/* between -267.7C and 165.8C, step +0.1C */
edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2677)
/* between -243.7C and 165.8C, step +0.1C */
edata->value_cur = (((buf[0] << 4) | (buf[1] & 0xf)) - 2437)
* 100000 + 273150000;
edata->state = ENVSYS_SVALID;
}