--- /dev/null
+/**
+ * \file
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+ * Copyright 2008 Develer S.r.l. (http://www.develer.com/)
+ * All Rights Reserved.
+ * -->
+ *
+ * \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 */