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drivers/power/bq2429x.c: Add trickle charging mode
This commit is contained in:
Juha Niskanen
committed by
Gregory Nutt
Gregory Nutt
parent
c014400895
commit
db079608d9
+53
-30
@@ -968,15 +968,48 @@ static inline int bq2429x_setcurr(FAR struct bq2429x_dev_s *priv,
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{
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uint8_t regval;
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int ret, idx;
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bool force_20pct = false;
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/* Verify if voltage is in the acceptable range */
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/* If requested current is below the minimum for fast charge,
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* configure for trickle charging. Trickle charging uses 20%
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* of current programmed to ICHG bits, so we multiply by five.
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*/
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if (req_current < BQ2429X_CURRCHG_MIN)
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{
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force_20pct = true;
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req_current *= 5;
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}
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/* Verify if current is in the acceptable range. */
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if (req_current < BQ2429X_CURRCHG_MIN || req_current > BQ2429X_CURRCHG_MAX)
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{
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baterr("ERROR: Current %d mA is out of range.\n", req_current);
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baterr("ERROR: Current %d mA is out of range.\n",
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force_20pct ? req_current / 5 : req_current);
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return -EINVAL;
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}
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/* According to the "Termination when REG02[0] = 1" section of
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* the bq24296M datasheet, the trickle charge could be less than
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* the termination current so it is recommended to turn off the
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* termination function.
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*
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* This means that the user will have to manually turn off the
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* charging when in 20% mode. Otherwise there could be battery
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* damage if we continuously trickle charge full battery until
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* safety timer finally stops it after 10 hours (timer is running
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* in half speed in 20% mode.)
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*/
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ret = bq2429x_en_term(priv, !force_20pct);
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if (ret < 0)
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{
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return ret;
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}
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/* Read previous current and charge type. */
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ret = bq2429x_getreg8(priv, BQ2429X_REG02, ®val, 1);
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if (ret < 0)
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{
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@@ -984,16 +1017,25 @@ static inline int bq2429x_setcurr(FAR struct bq2429x_dev_s *priv,
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return ret;
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}
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/* Current starts at _MIN mV and increases in steps of 64mA */
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/* Current starts at _MIN mA and increases in steps of 64mA. */
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idx = req_current - BQ2429X_CURRCHG_MIN;
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idx = idx / 64;
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/* Clear previous current and set new value */
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/* Clear previous current and charge type and set new values. */
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regval &= ~(BQ2429XR2_ICHG_MASK);
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regval |= (idx << BQ2429XR2_ICHG_SHIFT);
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if (force_20pct)
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{
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regval |= BQ2429XR2_FORCE_20PCT;
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}
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else
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{
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regval &= ~BQ2429XR2_FORCE_20PCT;
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}
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ret = bq2429x_putreg8(priv, BQ2429X_REG02, regval);
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if (ret < 0)
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{
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@@ -1082,12 +1124,13 @@ static int bq2429x_input_current(FAR struct battery_charger_dev_s *dev,
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* Name: bq2429x_operate
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*
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* Description:
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* Do miscellaneous battery ioctl().
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* Do miscellaneous battery operation. There are numerous options that are
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* configurable on the bq2429x that go beyond what the NuttX battery charger
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* API provide access to. This operate() function allows changing some of them.
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*
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* Set the battery charger current rate for charging
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* REG00 EN_HIZ
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* REG01 BOOST
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* REG01 CHARGE
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* REG01[1] BOOST_LIM 1A/1.5A Default:1.5A
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* REG01 CHG_CONFIG
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* REG02[1] BCOLD
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* REG02[1] FORCE_20PCT
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* REG05[1] EN_TERM Charging Termination Enable
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@@ -1101,14 +1144,13 @@ static int bq2429x_input_current(FAR struct battery_charger_dev_s *dev,
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* REG07[1] INT_MASK1 - Allow INT on CHRG_FAULT Default: 1 Allow
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* REG07[1] INT_MASK0 - Allow INT on BAT_FAULT Default: 1 Allow
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*
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* _provision
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* Set by other battery charger methods:
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* REG00[3] InputCurrent Limit 100mA 3000mA with PSEL
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* REG01[1] BOOST_LIM 1A/1.5A Default:1.5A
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* REG02[1] ICHG Fast Charge Current Limit, 512-3008mA Default 2048mA
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* REG03[4] IPRECHG Pre-charge current Limit 128-2048mA Default: 128mA
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* REG03[3] ITERM Termination Current Limit 128-1024mA Default: 256mA
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*
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* also System output voltage
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* System output voltage related:
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* REG00[4] VINDPM 3.88-5.08V Default:4.36V
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* REG01[3] Min Sys Voltage Range3.0-3.7V
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* REG04[6] Charge Voltage Limit 3504-4400mV Default: 4208mV
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@@ -1128,25 +1170,6 @@ static int bq2429x_operate(FAR struct battery_charger_dev_s *dev,
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bq2429x_dump_regs(priv);
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#if 0
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static bool wdg_disabled = 0;
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/* Tickle watchdog periodically or disable */
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if (!wdg_disabled)
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{
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wdg_disabled = true;
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bq2429x_reset(priv);
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ret = bq2429x_watchdog(priv, false); /* Disable */
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if (ret < 0)
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{
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baterr("ERROR: Failed to disable BQ2429x watchdog: %d\n", ret);
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return ret;
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}
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}
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#endif
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op = msg->operate_type;
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value = (int)msg->u32;
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switch (op)
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@@ -110,7 +110,7 @@
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#define BQ2429XR2_ICHG_MASK (0x3f << BQ2429XR2_ICHG_SHIFT)
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#define BQ2429XR2_BCOLD (1 << 1) /* Boost Mode temperature threshold config for boost disable 0=76% 1=79% */
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#define BQ2429XR2_FORCE_20PCT (1 << 0) /* Charge Configuration Threshold 0=Fast 1=less */
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#define BQ2429XR2_FORCE_20PCT (1 << 0) /* Charge type 0=Fast (default), 1=Trickle charge with 20% current */
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/* REG03 Pre-charge Termination Control Register */
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