6b13f685e
김민수
BSP 최초 추가
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#include <common.h>
#include <i2c.h>
#include <dtt.h>
#if defined(CONFIG_SYS_I2C_DTT_ADDR)
#define DTT_I2C_DEV_CODE CONFIG_SYS_I2C_DTT_ADDR
#else
#define DTT_I2C_DEV_CODE 0x48 /* ON Semi's LM75 device */
#endif
#define DTT_READ_TEMP 0x0
#define DTT_CONFIG 0x1
#define DTT_TEMP_HYST 0x2
#define DTT_TEMP_SET 0x3
int dtt_read(int sensor, int reg)
{
int dlen;
uchar data[2];
#ifdef CONFIG_DTT_AD7414
dtt_write(sensor, DTT_CONFIG, 0x64);
#endif
if((reg < 0) || (reg > 3))
return -1;
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
if ((reg == DTT_READ_TEMP) ||
(reg == DTT_TEMP_HYST) ||
(reg == DTT_TEMP_SET))
dlen = 2;
else
dlen = 1;
if (i2c_read(sensor, reg, 1, data, dlen) != 0)
return -1;
if (dlen == 2)
return ((int)((short)data[1] + (((short)data[0]) << 8)));
return (int)data[0];
}
int dtt_write(int sensor, int reg, int val)
{
int dlen;
uchar data[2];
if ((reg < 0) || (reg > 3))
return 1;
sensor = DTT_I2C_DEV_CODE + (sensor & 0x07);
if ((reg == DTT_READ_TEMP) ||
(reg == DTT_TEMP_HYST) ||
(reg == DTT_TEMP_SET)) {
dlen = 2;
data[0] = (char)((val >> 8) & 0xff);
data[1] = (char)(val & 0xff);
} else {
dlen = 1;
data[0] = (char)(val & 0xff);
}
if (i2c_write(sensor, reg, 1, data, dlen) != 0)
return 1;
return 0;
}
int dtt_init_one(int sensor)
{
int val;
val = ((CONFIG_SYS_DTT_MAX_TEMP * 2) << 7) & 0xff80;
if (dtt_write(sensor, DTT_TEMP_SET, val) != 0)
return 1;
val = (((CONFIG_SYS_DTT_MAX_TEMP - CONFIG_SYS_DTT_HYSTERESIS) * 2) << 7) & 0xff80;
if (dtt_write(sensor, DTT_TEMP_HYST, val) != 0)
return 1;
#ifdef CONFIG_DTT_AD7414
val = 0x60;
#else
val = 0x18;
#endif
if (dtt_write(sensor, DTT_CONFIG, val) != 0)
return 1;
return 0;
}
int dtt_get_temp(int sensor)
{
int const ret = dtt_read(sensor, DTT_READ_TEMP);
if (ret < 0) {
printf("DTT temperature read failed.
");
return 0;
}
return (int)((int16_t) ret / 256);
}
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