FreeCalypso > hg > fc-tourmaline

view src/cs/drivers/drv_app/fchg/fchg_convert_mA.c @ 275:79cfefc1e2b4

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audio mode load: gracefully handle mode files of wrong AEC version Unfortunately our change of enabling L1_NEW_AEC (which is necessary in order to bring our Calypso ARM fw into match with the underlying DSP reality) brings along a change in the audio mode file binary format and file size - all those new tunable AEC parameters do need to be stored somewhere, after all. But we already have existing mode files in the old format, and setting AEC config to garbage when loading old audio modes (which is what would happen without the present change) is not an appealing proposition. The solution implemented in the present change is as follows: the audio mode loading code checks the file size, and if it differs from the active version of T_AUDIO_MODE, the T_AUDIO_AEC_CFG structure is cleared - set to the default (disabled AEC) for the compiled type of AEC. We got lucky in that this varying T_AUDIO_AEC_CFG structure sits at the end of T_AUDIO_MODE!
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 30 Jul 2021 02:55:48 +0000
parents 09ea37852fd6
children
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/*
 * This module implements the fchg_convert_ichg_to_mA() function,
 * converting charging current (Ichg) measurements from ADC units
 * to human-friendly mA numbers.  In the phone hardware this current
 * measurement is made with the aid of a current measurement resistor
 * placed in the charging current path (the Iota chip's MADC actually
 * measures the voltage across this resistor, between VCCS and VBATS
 * terminals), and it just so happens that different phone designers
 * have chosen different values for this current measurement resistor:
 * Pirelli DP-L10 uses 0.20R, following TI's canon, whereas Mot C1xx
 * phones use 0.15R.  Because of these different resistor values,
 * the formula for converting ADC units to mA becomes target-dependent.
 */

#include "fchg/fchg_api.h"
#include "fc-target.h"

UINT16 fchg_convert_ichg_to_mA(UINT16 ichg)
{
#ifdef CONFIG_TARGET_COMPAL
	/* formula for 0.15R */
	return (ichg * 875 / 768);
#else
	/* formula for 0.20R */
	return (ichg * 875 / 1024);
#endif
}