#include <dtt.h>
#include <i2c.h>
-int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
+static unsigned long sensor_initialized;
+
+static void _initialize_dtt(void)
+{
+ int i;
+ unsigned char sensors[] = CONFIG_DTT_SENSORS;
+
+ for (i = 0; i < sizeof(sensors); i++) {
+ if ((sensor_initialized & (1 << i)) == 0) {
+ if (dtt_init_one(sensors[i]) != 0) {
+ printf("DTT%d: Failed init!\n", i);
+ continue;
+ }
+ sensor_initialized |= (1 << i);
+ }
+ }
+}
+
+void dtt_init(void)
+{
+ int old_bus;
+
+ /* switch to correct I2C bus */
+ old_bus = I2C_GET_BUS();
+ I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
+
+ _initialize_dtt();
+
+ /* switch back to original I2C bus */
+ I2C_SET_BUS(old_bus);
+}
+
+int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
{
int i;
unsigned char sensors[] = CONFIG_DTT_SENSORS;
int old_bus;
+ /* Force a compilation error, if there are more then 32 sensors */
+ BUILD_BUG_ON(sizeof(sensors) > 32);
/* switch to correct I2C bus */
old_bus = I2C_GET_BUS();
I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
+ _initialize_dtt();
+
/*
* Loop through sensors, read
* temperature, and output it.
*/
- for (i = 0; i < sizeof (sensors); i++)
- printf ("DTT%d: %i C\n", i + 1, dtt_get_temp (sensors[i]));
+ for (i = 0; i < sizeof(sensors); i++)
+ printf("DTT%d: %i C\n", i + 1, dtt_get_temp(sensors[i]));
/* switch back to original I2C bus */
I2C_SET_BUS(old_bus);
U_BOOT_CMD(
dtt, 1, 1, do_dtt,
- "dtt - Digital Thermometer and Thermostat\n",
- " - Read temperature from digital thermometer and thermostat.\n"
+ "Read temperature from Digital Thermometer and Thermostat",
+ ""
);