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annotate src/cs/drivers/drv_app/fchg/fchg_convert_mA.c @ 262:7420959e02ec

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FCHG rework for charger plug/unplug debouncing
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 May 2021 05:38:55 +0000
parents 09ea37852fd6
children
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09ea37852fd6 add function to convert Ichg ADC readings to mA
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
09ea37852fd6 add function to convert Ichg ADC readings to mA
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2 * This module implements the fchg_convert_ichg_to_mA() function,
09ea37852fd6 add function to convert Ichg ADC readings to mA
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3 * converting charging current (Ichg) measurements from ADC units
09ea37852fd6 add function to convert Ichg ADC readings to mA
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4 * to human-friendly mA numbers. In the phone hardware this current
09ea37852fd6 add function to convert Ichg ADC readings to mA
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5 * measurement is made with the aid of a current measurement resistor
09ea37852fd6 add function to convert Ichg ADC readings to mA
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6 * placed in the charging current path (the Iota chip's MADC actually
09ea37852fd6 add function to convert Ichg ADC readings to mA
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7 * measures the voltage across this resistor, between VCCS and VBATS
09ea37852fd6 add function to convert Ichg ADC readings to mA
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8 * terminals), and it just so happens that different phone designers
09ea37852fd6 add function to convert Ichg ADC readings to mA
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9 * have chosen different values for this current measurement resistor:
09ea37852fd6 add function to convert Ichg ADC readings to mA
Mychaela Falconia <falcon@freecalypso.org>
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10 * Pirelli DP-L10 uses 0.20R, following TI's canon, whereas Mot C1xx
09ea37852fd6 add function to convert Ichg ADC readings to mA
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11 * phones use 0.15R. Because of these different resistor values,
09ea37852fd6 add function to convert Ichg ADC readings to mA
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12 * the formula for converting ADC units to mA becomes target-dependent.
09ea37852fd6 add function to convert Ichg ADC readings to mA
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13 */
09ea37852fd6 add function to convert Ichg ADC readings to mA
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14
09ea37852fd6 add function to convert Ichg ADC readings to mA
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15 #include "fchg/fchg_api.h"
09ea37852fd6 add function to convert Ichg ADC readings to mA
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16 #include "fc-target.h"
09ea37852fd6 add function to convert Ichg ADC readings to mA
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17
09ea37852fd6 add function to convert Ichg ADC readings to mA
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18 UINT16 fchg_convert_ichg_to_mA(UINT16 ichg)
09ea37852fd6 add function to convert Ichg ADC readings to mA
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19 {
09ea37852fd6 add function to convert Ichg ADC readings to mA
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20 #ifdef CONFIG_TARGET_COMPAL
09ea37852fd6 add function to convert Ichg ADC readings to mA
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21 /* formula for 0.15R */
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22 return (ichg * 875 / 768);
09ea37852fd6 add function to convert Ichg ADC readings to mA
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23 #else
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24 /* formula for 0.20R */
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25 return (ichg * 875 / 1024);
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26 #endif
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27 }