133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*****************************************************************************
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*
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* Copyright(C) 2011, Embedded Artists AB
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* All rights reserved.
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*
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******************************************************************************
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* Software that is described herein is for illustrative purposes only
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* which provides customers with programming information regarding the
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* products. This software is supplied "AS IS" without any warranties.
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* Embedded Artists AB assumes no responsibility or liability for the
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* use of the software, conveys no license or title under any patent,
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* copyright, or mask work right to the product. Embedded Artists AB
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* reserves the right to make changes in the software without
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* notification. Embedded Artists AB also make no representation or
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* warranty that such application will be suitable for the specified
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* use without further testing or modification.
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*****************************************************************************/
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/*
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* NOTE: I2C must have been initialized before calling any functions in this
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* file.
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*/
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/******************************************************************************
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* Includes
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*****************************************************************************/
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#include "../../board.h"
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#if BOARD == BOARD_EA4357
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#include <string.h>
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#include <stdio.h>
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#include "lpc_types.h"
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#include "lpc43xx_i2c.h"
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/******************************************************************************
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* Defines and typedefs
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*****************************************************************************/
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#define I2C_PORT (LPC_I2C0)
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#define LM75A_I2C_ADDR (0x48)
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#define LM75A_CMD_TEMP 0x00
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#define I2CDEV LPC_I2C2
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/******************************************************************************
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* External global variables
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*****************************************************************************/
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/******************************************************************************
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* Local variables
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*****************************************************************************/
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/******************************************************************************
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* Local Functions
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*****************************************************************************/
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static Status I2CWrite(uint32_t addr, uint8_t* buf, uint32_t len)
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{
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I2C_M_SETUP_Type i2cData;
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i2cData.sl_addr7bit = addr;
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i2cData.tx_data = buf;
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i2cData.tx_length = len;
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i2cData.rx_data = NULL;
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i2cData.rx_length = 0;
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i2cData.retransmissions_max = 3;
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return I2C_MasterTransferData(I2C_PORT, &i2cData, I2C_TRANSFER_POLLING);
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}
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static Status I2CRead(uint32_t addr, uint8_t* buf, uint32_t len)
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{
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I2C_M_SETUP_Type i2cData;
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i2cData.sl_addr7bit = addr;
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i2cData.tx_data = NULL;
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i2cData.tx_length = 0;
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i2cData.rx_data = buf;
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i2cData.rx_length = len;
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i2cData.retransmissions_max = 3;
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return I2C_MasterTransferData(I2C_PORT, &i2cData, I2C_TRANSFER_POLLING);
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}
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/******************************************************************************
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* Public Functions
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*****************************************************************************/
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/******************************************************************************
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*
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* Description:
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* Initialize the EEPROM Driver
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*
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*****************************************************************************/
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void lm75a_init (void)
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{
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}
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/******************************************************************************
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*
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* Description:
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* Read the temperature
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*
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* Params: None
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*
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* Returns:
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* The measured temperature x 100, i.e. 26.50 degrees returned as 2650
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*
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*****************************************************************************/
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int32_t lm75a_readTemp(void)
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{
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uint8_t temp[2];
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int16_t t = 0;
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I2CWrite(LM75A_I2C_ADDR, LM75A_CMD_TEMP, 1);
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I2CRead(LM75A_I2C_ADDR, temp, 2);
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/* 11 MSB bits used. Celcius is calculated as Temp data * 1/8 */
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t = ((temp[0] << 8) | (temp[1]));
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return ((t * 100) >> 8);
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}
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#endif
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