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view src/cs/drivers/drv_app/fchg/fchg_convert_mA.c @ 303:f76436d19a7a default tip

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!GPRS config: fix long-standing AT+COPS chance hanging bug There has been a long-standing bug in FreeCalypso going back years: sometimes in the AT command bring-up sequence of an ACI-only MS, the AT+COPS command would produce only a power scan followed by cessation of protocol stack activity (only L1 ADC traces), instead of the expected network search sequence. This behaviour was seen in different FC firmware versions going back to Citrine, and seemed to follow some law of chance, not reliably repeatable. This bug has been tracked down and found to be specific to !GPRS configuration, stemming from our TCS2/TCS3 hybrid and reconstruction of !GPRS support that was bitrotten in TCS3.2/LoCosto version. ACI module psa_mms.c, needed only for !GPRS, was missing in the TCS3 version and had to be pulled from TCS2 - but as it turns out, there is a new field in the MMR_REG_REQ primitive that needs to be set correctly, and that psa_mms.c module is the place where this initialization needed to be added.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 08 Jun 2023 08:23:37 +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
}