nrf_temp.h

00001 /* Copyright (c) 2012 Nordic Semiconductor. All Rights Reserved.
00002  *
00003  * The information contained herein is property of Nordic Semiconductor ASA.
00004  * Terms and conditions of usage are described in detail in NORDIC
00005  * SEMICONDUCTOR STANDARD SOFTWARE LICENSE AGREEMENT.
00006  *
00007  * Licensees are granted free, non-transferable use of the information. NO
00008  * WARRANTY of ANY KIND is provided. This heading must NOT be removed from
00009  * the file.
00010  *
00011  */
00012 
00013 #ifndef NRF_TEMP_H__
00014 #define NRF_TEMP_H__
00015 
00016 #include "nrf51.h"
00017 
00018 /**
00019 * @defgroup nrf_temperature TEMP (temperature) abstraction
00020 * @{
00021 * @ingroup nrf_drivers temperature_example
00022 * @brief Temperature module init and read functions.
00023 *
00024 */
00025 
00026 
00027 
00028 /**
00029  * @brief Function for preparing the temp module for temperature measurement.
00030  *
00031  * This function initializes the TEMP module and writes to the hidden configuration register.
00032  * 
00033  * @param none
00034  */
00035 static __INLINE void nrf_temp_init(void)
00036 {
00037     /**@note Workaround for PAN_028 rev2.0A anomaly 31 - TEMP: Temperature offset value has to be manually loaded to the TEMP module */
00038     *(uint32_t *) 0x4000C504 = 0;
00039 }
00040 
00041 
00042 
00043 #define MASK_SIGN           (0x00000200UL)
00044 #define MASK_SIGN_EXTENSION (0xFFFFFC00UL)
00045 
00046 /**
00047  * @brief Function for reading temperature measurement.
00048  *
00049  * The function reads the 10 bit 2's complement value and transforms it to a 32 bit 2's complement value.
00050  * 
00051  * @param none
00052  */
00053 static __INLINE int32_t nrf_temp_read(void)
00054 {    
00055     /**@note Workaround for PAN_028 rev2.0A anomaly 28 - TEMP: Negative measured values are not represented correctly */
00056     return ((NRF_TEMP->TEMP & MASK_SIGN) != 0) ? (NRF_TEMP->TEMP | MASK_SIGN_EXTENSION) : (NRF_TEMP->TEMP);    
00057 }
00058 
00059 /** @} */
00060 
00061 #endif