+++ /dev/null
-/**
- * \file
- * <!--
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- *
- * \brief NTC hardware-specific definition
- *
- * \version $Id$
- * \author Francesco Sacchi <batt@develer.com>
- *
- * A NTC acts as a variable resistor, whose resistance changes as a
- * function of the temperature it measures. To sample it correctly, it is
- * usually parallelized and serialized with two fixed resistor. The following diagram shows
- * what is the exact disposition of the components, as handled by this
- * library:
- *
- *<pre>
- * o Vref
- * |
- * | o Vref
- * | |
- * ----- |
- * | | ---------
- * | Rser| | |
- * | | | |
- * ----- ----- | ADC |
- * | Vp | | | |
- * -----------|------| Amp |-------------| |
- * | | | | Vadc | |
- * ----- ----- ----- ---------
- * | | | |
- * | NTC | | Rpar|
- * | | | |
- * ----- -----
- * | |
- * | |
- * ----- -----
- * --- ---
- *</pre>
- * Amp is an amplifier that amplify of AMP times the signal.
- * If we indicate Rp as the parallel of NTC with Rpar, ADCBITS as the bits of the ad converter
- * and ADCVAL as the result from the adc convertion (Not Vadc but just the value read
- * from the adc register), after various calculation, the expression of Rp is:
- *
- *<pre>
- *
- * ADCVAL * Rser
- * Rp = ------------------------
- * ADCBITS
- * 2 * AMP - ADCVAL
- *</pre>
- *
- * And after that NTC obvisiously is:
- *<pre>
- * Rpar * Rp
- * NTC = ----------
- * Rpar - Rp
- *</pre>
- *
- *
- * The function ntc_hw_read() compute the resistence using these formulas above.
- */
-
-#ifndef HW_NTC_H
-#define HW_NTC_H
-
-#include "ntc_map.h"
-
-#include <cfg/debug.h>
-
-#include <drv/ntc.h>
-#include <drv/adc.h>
-
-#warning TODO:This is an example implementation, you must implement it!
-
-extern const res_t NTC_RSER[NTC_CNT];
-extern const res_t NTC_RPAR[NTC_CNT];
-extern const amp_t NTC_AMP[NTC_CNT];
-extern const NtcHwInfo* NTC_INFO[NTC_CNT];
-
-
-/*!
- * Read the resistence of ntc device \a dev.
- * Return the result in res_t type.
- */
-INLINE res_t ntc_hw_read(NtcDev dev)
-{
- ASSERT(dev < NTC_CNT);
- // See above for formula explanation.
- adcread_t adcval = adc_read((uint16_t)dev);
- float rp = (adcval * NTC_RSER[dev] ) / ((1 << adc_bits()) * NTC_AMP[dev] - adcval);
-
- //kprintf("Rp[%f], Rntc[%f]\n", rp/100, ((NTC_RPAR[dev] * rp) / (NTC_RPAR[dev] - rp)) / 100.0);
-
- return ( (NTC_RPAR[dev] * rp) / (NTC_RPAR[dev] - rp) );
-}
-
-
-/*!
- * Return the info (aka the table) associated with ntc device \a dev.
- */
-INLINE const NtcHwInfo* ntc_hw_getInfo(NtcDev dev)
-{
- return NTC_INFO[dev];
-}
-
-#define NTC_HW_INIT do { /* Implement me! */ } while(0)
-
-#endif /* HW_NTC_H */
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