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https://github.com/smaeul/u-boot.git
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780f13a9e1
The U-Boot Design Principles[1] clearly say: Initialize devices only when they are needed within U-Boot, i.e. don't initialize the Ethernet interface(s) unless U-Boot performs a download over Ethernet; don't initialize any IDE or USB devices unless U-Boot actually tries to load files from these, etc. (and don't forget to shut down these devices after using them - otherwise nasty things may happen when you try to boot your OS). So, do not initialize and read the sensors on startup. Signed-off-by: Heiko Schocher <hs@denx.de> cc: Wolfgang Denk <wd@denx.de> cc: Holger Brunck <holger.brunck@keymile.com>
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
/*
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* (C) Copyright 2001
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* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <dtt.h>
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#include <i2c.h>
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static unsigned long sensor_initialized;
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int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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int i;
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unsigned char sensors[] = CONFIG_DTT_SENSORS;
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int old_bus;
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/* Force a compilation error, if there are more then 32 sensors */
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BUILD_BUG_ON(sizeof(sensors) > 32);
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/* switch to correct I2C bus */
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old_bus = I2C_GET_BUS();
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I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
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/*
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* Loop through sensors, read
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* temperature, and output it.
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*/
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for (i = 0; i < sizeof(sensors); i++) {
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if ((sensor_initialized & (1 << i)) == 0) {
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if (dtt_init_one(sensors[i]) != 0) {
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printf("DTT%d: Failed init!\n", i);
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continue;
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}
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sensor_initialized |= (1 << i);
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}
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printf("DTT%d: %i C\n", i + 1, dtt_get_temp(sensors[i]));
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}
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/* switch back to original I2C bus */
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I2C_SET_BUS(old_bus);
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return 0;
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} /* do_dtt() */
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/***************************************************/
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U_BOOT_CMD(
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dtt, 1, 1, do_dtt,
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"Read temperature from Digital Thermometer and Thermostat",
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""
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);
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