2010-03-05 21:35:29 +00:00
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/*
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* This file is part of the libopenstm32 project.
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*
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* Copyright (C) 2010 Thomas Otto <tommi@viadmin.org>
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*
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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 3 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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*
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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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2010-12-30 01:23:51 +00:00
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#include <stm32/i2c.h>
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2010-03-05 21:35:29 +00:00
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#include "stts75.h"
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void stts75_write_config(u32 i2c, u8 sensor)
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{
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2010-03-05 21:46:27 +00:00
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u32 reg32;
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2010-03-05 21:35:29 +00:00
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/* Send START condition. */
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i2c_send_start(i2c);
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/* Waiting for START is send and switched to master mode. */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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/* Send destination address. */
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i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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2010-03-05 21:46:27 +00:00
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reg32 = I2C_SR2(i2c);
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2010-03-05 21:35:29 +00:00
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/* Sending the data. */
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i2c_send_data(i2c, 0x1); /* stts75 config register */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF)); /* Await ByteTransferedFlag. */
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i2c_send_data(i2c, 0x4); /* pol reverse - LED glows if temp is below Tos/Thyst */
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE)));
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/* Send STOP condition. */
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i2c_send_stop(i2c);
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}
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void stts75_write_temp_os(u32 i2c, u8 sensor, u16 temp_os)
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{
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2010-03-05 21:46:27 +00:00
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u32 reg32;
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2010-03-05 21:35:29 +00:00
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/* Send START condition. */
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i2c_send_start(i2c);
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/* Waiting for START is send and switched to master mode. */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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/* Send destination address. */
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i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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2010-03-05 21:46:27 +00:00
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reg32 = I2C_SR2(i2c);
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2010-03-05 21:35:29 +00:00
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/* Sending the data. */
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i2c_send_data(i2c, 0x3); /* OvertemperatureShutdown register */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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i2c_send_data(i2c, (u8)(temp_os >> 8)); /* MSB */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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i2c_send_data(i2c, (u8)(temp_os & 0xff00)); /* LSB */
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
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/* Send STOP condition. */
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i2c_send_stop(i2c);
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}
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void stts75_write_temp_hyst(u32 i2c, u8 sensor, u16 temp_hyst)
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{
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2010-03-05 21:46:27 +00:00
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u32 reg32;
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2010-03-05 21:35:29 +00:00
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/* Send START condition. */
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i2c_send_start(i2c);
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/* Waiting for START is send and therefore switched to master mode. */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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/* Say to what address we want to talk to. */
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i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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2010-03-05 21:46:27 +00:00
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reg32 = I2C_SR2(i2c);
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2010-03-05 21:35:29 +00:00
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/* Sending the data. */
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i2c_send_data(i2c, 0x2); /* TemperatureHysteresis register */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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i2c_send_data(i2c, (u8)(temp_hyst >> 8)); /* MSB */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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i2c_send_data(i2c, (u8)(temp_hyst & 0xff00)); /* LSB */
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF | I2C_SR1_TxE))); /* After the last byte we have to wait for TxE too. */
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/* Send STOP condition. */
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i2c_send_stop(i2c);
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}
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u16 stts75_read_temperature(u32 i2c, u8 sensor)
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{
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2010-03-05 21:46:27 +00:00
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u32 reg32;
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2010-03-05 21:35:29 +00:00
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u16 temperature;
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/* Send START condition. */
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i2c_send_start(i2c);
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/* Waiting for START is send and switched to master mode. */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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/* Say to what address we want to talk to. */
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/* Yes, WRITE is correct - for selecting register in STTS75. */
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i2c_send_7bit_address(i2c, sensor, I2C_WRITE);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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2010-03-05 21:46:27 +00:00
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reg32 = I2C_SR2(i2c);
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2010-03-05 21:35:29 +00:00
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i2c_send_data(i2c, 0x0); /* temperature register */
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while (!(I2C_SR1(i2c) & (I2C_SR1_BTF|I2C_SR1_TxE)));
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/*
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* Now we transferred that we want to ACCESS the temperature register.
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* Now we send another START condition (repeated START) and then
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* transfer the destination but with flag READ.
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*/
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/* Send START condition. */
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i2c_send_start(i2c);
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/* Waiting for START is send and switched to master mode. */
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while (!((I2C_SR1(i2c) & I2C_SR1_SB)
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& (I2C_SR2(i2c) & (I2C_SR2_MSL | I2C_SR2_BUSY))));
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/* Say to what address we want to talk to. */
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i2c_send_7bit_address(i2c, sensor, I2C_READ);
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/* 2-byte receive is a special case. See datasheet POS bit. */
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I2C_CR1(i2c) |= (I2C_CR1_POS | I2C_CR1_ACK);
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/* Waiting for address is transferred. */
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while (!(I2C_SR1(i2c) & I2C_SR1_ADDR));
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/* Cleaning ADDR condition sequence. */
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2010-03-05 21:46:27 +00:00
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reg32 = I2C_SR2(i2c);
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2010-03-05 21:35:29 +00:00
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/* Cleaning I2C_SR1_ACK. */
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I2C_CR1(i2c) &= ~ I2C_CR1_ACK;
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/* Now the slave should begin to send us the first byte. Await BTF. */
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while (!(I2C_SR1(i2c) & I2C_SR1_BTF));
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temperature = (u16)(I2C_DR(i2c) << 8); /* MSB */
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/*
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* Yes they mean it: we have to generate the STOP condition before
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* saving the 1st byte.
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*/
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I2C_CR1(i2c) |= I2C_CR1_STOP;
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temperature |= I2C_DR(i2c); /* LSB */
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/* Original state. */
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I2C_CR1(i2c) &= ~I2C_CR1_POS;
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return temperature;
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}
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