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https://github.com/u-boot/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>
84 lines
1.9 KiB
C
84 lines
1.9 KiB
C
/*
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* (C) Copyright 2008
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* Ricado Ribalda-Universidad Autonoma de Madrid, ricardo.ribalda@uam.es
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* This work has been supported by: QTechnology http://qtec.com/
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <common.h>
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#include <i2c.h>
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#include <dtt.h>
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#define ADT7460_ADDRESS 0x2c
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#define ADT7460_INVALID 128
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#define ADT7460_CONFIG 0x40
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#define ADT7460_REM1_TEMP 0x25
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#define ADT7460_LOCAL_TEMP 0x26
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#define ADT7460_REM2_TEMP 0x27
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int dtt_read(int sensor, int reg)
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{
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u8 dir = reg;
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u8 data;
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if (i2c_read(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
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return -1;
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if (data == ADT7460_INVALID)
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return -1;
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return data;
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}
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int dtt_write(int sensor, int reg, int val)
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{
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u8 dir = reg;
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u8 data = val;
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if (i2c_write(ADT7460_ADDRESS, dir, 1, &data, 1) == -1)
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return -1;
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return 0;
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}
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int dtt_init_one(int sensor)
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{
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printf("ADT7460 at I2C address 0x%2x\n", ADT7460_ADDRESS);
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if (dtt_write(0, ADT7460_CONFIG, 1) == -1) {
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puts("Error initialiting ADT7460\n");
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return -1;
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}
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return 0;
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}
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int dtt_get_temp(int sensor)
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{
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int aux;
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u8 table[] =
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{ ADT7460_REM1_TEMP, ADT7460_LOCAL_TEMP, ADT7460_REM2_TEMP };
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if (sensor > 2) {
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puts("DTT sensor does not exist\n");
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return -1;
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}
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aux = dtt_read(0, table[sensor]);
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if (aux == -1) {
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puts("DTT temperature read failed\n");
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return -1;
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}
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return aux;
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}
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