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Merge "Remove unused temperature command"

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Gerrit
2012-02-28 11:48:18 -08:00
committed by Gerrit Code Review
parent 2a469c61cf c55b1527ae
commit 7e40bacb1b
1 changed files with 46 additions and 39 deletions
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85
common/tmp006.c
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@@ -50,6 +50,7 @@ static int tmp006_read_die_temp(int idx)
*/
static int tmp006_calculate_object_temp(int Tdie_i, int Vobj_i, int S0_i)
{
#ifdef CONFIG_FPU
float Tdie, Vobj, S0;
float Tx, S, Vos, Vx, fv, Tobj, T4;
int Tobj_i;
@@ -77,6 +78,51 @@ static int tmp006_calculate_object_temp(int Tdie_i, int Vobj_i, int S0_i)
disable_fpu(Tobj_i);
return Tobj_i;
#else
/* This is the fixed-point version of object temperature calculation.
* Should be accurate but it is hard to prevent and debug
* overflow/underflow problem. Only use this version if there is no
* FPU support.
* Division is delayed when possible to preserve precision, but should
* not cause overflow.
* Assuming Tdie is between 200K and 400K, and S0 between 3e-14 and
* 9e-14, the maximum value during the calculation should be less than
* (1 << 30), which fits in int32_t.
*/
int32_t Tx, S19, Vos, Vx, fv9, ub, lb;
Tx = Tdie - 29815;
/* S19 is the sensitivity multipled by 1e19 */
S19 = S0 * (100000 + 175 * Tx / 100 -
1678 * Tx / 100 * Tx / 100000) / 1000;
/* Vos is the offset voltage in nV */
Vos = -29400 - 570 * Tx / 100 + 463 * Tx / 100 * Tx / 10000;
Vx = Vobj - Vos;
/* fv9 is Seebeck coefficient f(Vobj) multipled by 1e9 */
fv9 = Vx + 134 * Vx / 100000 * Vx / 100000;
/* The last step in the calculation involves square root, so we use
* binary search.
* Assuming the object temperature is between 200K and 400K, the search
* should take at most 14 iterations.
*/
ub = 40000;
lb = 20000;
while (lb != ub) {
int32_t t, rhs, lhs;
t = (ub + lb) / 2;
lhs = t / 100 * t / 10000 * t / 10000 * (S19/100) / 1000 * t;
rhs = Tdie / 100 * Tdie / 10000 * Tdie / 10000 * (S19/100) /
1000 * Tdie + fv9 * 1000;
if (lhs > rhs)
ub = t;
else
lb = t + 1;
}
return ub;
#endif /* CONFIG_FPU */
}
/* Temporal Correction
@@ -209,45 +255,6 @@ int tmp006_poll(void)
/*****************************************************************************/
/* Console commands */
/* TMP006 object temperature calculation command.
* TODO: This command is only for debugging. Remove it when temporal correciton
* is done.
*/
static int command_sensor_remote(int argc, char **argv)
{
char *e;
int32_t Td2, Vobj9, Sm03;
if (argc != 4) {
uart_puts("Usage: tempcorrect <Tdie*100> <Vobj*10^9> <S0*10^11>\n");
return EC_ERROR_UNKNOWN;
}
Td2 = strtoi(argv[1], &e, 0);
if (e && *e) {
uart_puts("Bad Tdie.\n");
return EC_ERROR_UNKNOWN;
}
Vobj9 = strtoi(argv[2], &e, 0);
if (e && *e) {
uart_puts("Bad Vobj.\n");
return EC_ERROR_UNKNOWN;
}
Sm03 = strtoi(argv[3], &e, 0);
if (e && *e) {
uart_puts("Bad S0.\n");
return EC_ERROR_UNKNOWN;
}
uart_printf("%d\n",
tmp006_calculate_object_temp(Td2, Vobj9, Sm03));
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(tempremote, command_sensor_remote);
static int command_sensor_info(int argc, char **argv)
{
int i;