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Add tmp006 object temperature calculation

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Implement TMP006 object temperature calculation. Also add a console
command to calculate temperature with manually entered data.

BUG=chrome-os-partner:7801
TEST=In console, "tempremote 29715 -105000 6390" gives 285.00K.

Change-Id: I0f9193fb970fdc36566399e7083e73ab58965a85
This commit is contained in:
Vic Yang
2012-02-08 14:08:14 +08:00
parent d3e1de758c
commit 059c633a27
4 changed files with 121 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
board/bds/board_temp_sensor.c
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@@ -18,5 +18,5 @@ const struct temp_sensor_t temp_sensors[TEMP_SENSOR_COUNT] = {
{"ECInternal", TEMP_SENSOR_EC_INTERNAL, TEMP_SENSOR_NO_ADDR,
chip_temp_sensor_read, TEMP_SENSOR_NO_PRINT},
{"CaseDie", TEMP_SENSOR_CASE_DIE, TEMP_CASE_DIE_ADDR,
temp_sensor_tmp006_read, temp_sensor_tmp006_print}
temp_sensor_tmp006_read_die_temp, temp_sensor_tmp006_print}
};

8
board/link/board_temp_sensor.c
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@@ -25,13 +25,13 @@
*/
const struct temp_sensor_t temp_sensors[TEMP_SENSOR_COUNT] = {
{"CPU", TEMP_SENSOR_I2C_DIE_NEAR_CPU, TEMP_CPU_ADDR,
temp_sensor_tmp006_read, temp_sensor_tmp006_print},
temp_sensor_tmp006_read_die_temp, temp_sensor_tmp006_print},
{"PCH", TEMP_SENSOR_I2C_DIE_NEAR_PCH, TEMP_PCH_ADDR,
temp_sensor_tmp006_read, temp_sensor_tmp006_print},
temp_sensor_tmp006_read_die_temp, temp_sensor_tmp006_print},
{"DDR", TEMP_SENSOR_I2C_DIE_NEAR_DDR, TEMP_DDR_ADDR,
temp_sensor_tmp006_read, temp_sensor_tmp006_print},
temp_sensor_tmp006_read_die_temp, temp_sensor_tmp006_print},
{"Charger", TEMP_SENSOR_I2C_DIE_NEAR_CHARGER, TEMP_CHARGER_ADDR,
temp_sensor_tmp006_read, temp_sensor_tmp006_print},
temp_sensor_tmp006_read_die_temp, temp_sensor_tmp006_print},
{"ECInternal", TEMP_SENSOR_EC_INTERNAL, TEMP_SENSOR_NO_ADDR,
chip_temp_sensor_read, TEMP_SENSOR_NO_PRINT},
};

112
common/temp_sensor.c
View File

@@ -27,7 +27,7 @@ int temp_sensor_read(enum temp_sensor_id id)
return sensor->read(sensor);
}
int temp_sensor_tmp006_read(const struct temp_sensor_t* sensor)
int temp_sensor_tmp006_read_die_temp(const struct temp_sensor_t* sensor)
{
int traw, t;
int rv;
@@ -40,6 +40,78 @@ int temp_sensor_tmp006_read(const struct temp_sensor_t* sensor)
return t + 273;
}
/* Calculate the remote object temperature.
* Parameters:
* Tdie: Die temperature in 1/100 K.
* Vobj: Voltage read from register 0. In nV.
* S0: Sensitivity factor in 1/1000.
* Return:
* Object temperature in 1/100 K.
*/
int temp_sensor_tmp006_calculate_object_temp(int Tdie, int Vobj, int S0)
{
int32_t Tx, S19, Vos, Vx, fv9, ub, lb;
/* Calculate according to TMP006 users guide.
* 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.
*/
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;
}
int temp_sensor_tmp006_read_object_temp(const struct temp_sensor_t* sensor)
{
int traw, t;
int vraw, v;
int rv;
int addr = sensor->addr;
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x01, &traw);
if (rv)
return -1;
t = (int)(int16_t)traw / 128 + 273;
rv = i2c_read16(TMP006_PORT(addr), TMP006_REG(addr), 0x00, &vraw);
if (rv)
return -1;
v = ((int)(int16_t)vraw * 15625) / 100;
return temp_sensor_tmp006_calculate_object_temp(t * 100, v, 6400);
}
void temp_sensor_tmp006_config(const struct temp_sensor_t* sensor)
{
int addr = sensor->addr;
@@ -132,6 +204,44 @@ static int command_sensor_info(int argc, char ** argv)
}
DECLARE_CONSOLE_COMMAND(tempsinfo, command_sensor_info);
/* 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",
temp_sensor_tmp006_calculate_object_temp(Td2, Vobj9, Sm03));
return EC_SUCCESS;
}
DECLARE_CONSOLE_COMMAND(tempremote, command_sensor_remote);
/*****************************************************************************/
/* Initialization */

7
include/temp_sensor.h
View File

@@ -45,8 +45,11 @@ int temp_sensor_read(enum temp_sensor_id id);
#define TMP006_PORT(ADDR) (ADDR >> 16)
#define TMP006_REG(ADDR) (ADDR & 0xffff)
/* Read TI TMP006 temperature sensor. Return temperature in K. */
int temp_sensor_tmp006_read(const struct temp_sensor_t* sensor);
/* Read TI TMP006 die temperature sensor. Return temperature in K. */
int temp_sensor_tmp006_read_die_temp(const struct temp_sensor_t* sensor);
/* Read TI TMP006 object temperature sensor. Return temperature in K. */
int temp_sensor_tmp006_read_object_temp(const struct temp_sensor_t* sensor);
/* Configure TMP006 DRDY pin. */
void temp_sensor_tmp006_config(const struct temp_sensor_t* sensor);