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Enable ADC charger current monitor for Slippy

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The IOUT pin of the smart battery charger can be used to monitor the AC
adapter current (default) or the battery charging current.

BUG=none
BRANCH=none
TEST=manual

Discharge the battery a bit, and connect to the EC console. With the AC
power plugged in, the "battery" command should show charging status,
including current.

The "adc" command will display the A-D converters, including the current
measurement. For example:

  > battery
    Temp:      0x0b88 = 295.2 K (22.1 C)
    Manuf:     SMP-COS20
    Device:    OC2
    Chem:      LION
    Serial:    0x0005
    V:         0x4130 = 16688 mV
    V-desired: 0x41a0 = 16800 mV
    V-design:  0x39d0 = 14800 mV
    I:         0x008e = 142 mA(CHG)
    I-desired: 0x0080 = 128 mA
    Mode:      0x6001
    Charge:    98 %
      Abs:     94 %
    Remaining: 1871 mAh
    Cap-full:  1923 mAh
      Design:  2000 mAh
    Time-full: 0h:23
      Empty:   0h:0
  >
  > adc
  ADC channel "ECTemp" = 317
  ADC channel "ChargerCurrent" = 455
  >

That current is significantly higher than the "I:" reported by the "battery"
command. But look at the charger options:

  > sbc 0x12
  0x7904 (30980)
  >

Bit 5 controls the IOUT Selection. When clear, it monitors the current from
the AC adapter. Set bit 5 to monitor the current provided to the battery:

  > sbc 0x12 0x7924
  > adc
  ADC channel "ECTemp" = 318
  ADC channel "ChargerCurrent" = 128
  >

That matches what the smart battery sees.

Change-Id: I2fe351304421dfb22d83ef13d416aa44c9f56e8a
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/57940
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Bill Richardson
2013-06-06 18:06:30 -07:00
committed by ChromeBot
parent f32ad15e37
commit 149a8457aa
3 changed files with 7 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
board/slippy/board.c
View File

@@ -125,11 +125,13 @@ const struct adc_t adc_channels[ADC_CH_COUNT] = {
{"ECTemp", LM4_ADC_SEQ0, -225, ADC_READ_MAX, 420,
LM4_AIN_NONE, 0x0e /* TS0 | IE0 | END0 */, 0, 0},
/* HEY: need different equation for Slippy */
/* Charger current is mapped from 0~4000mA to 0~1.6V.
* And ADC maps 0~3.3V to ADC_READ_MAX.
/* IOUT == ICMNT is on PE3/AIN0 */
/* We have 0.01-ohm resistors, and IOUT is 20X the differential
* voltage, so 1000mA ==> 200mV.
* ADC returns 0x000-0xFFF, which maps to 0.0-3.3V (as configured).
* mA = 1000 * ADC_VALUE / ADC_READ_MAX * 3300 / 200
*/
{"ChargerCurrent", LM4_ADC_SEQ1, 33 * 4000, ADC_READ_MAX * 16, 0,
{"ChargerCurrent", LM4_ADC_SEQ1, 33000, ADC_READ_MAX * 2, 0,
LM4_AIN(0), 0x06 /* IE0 | END0 */, LM4_GPIO_E, (1<<3)},
};

4
chip/lm4/clock.c
View File

@@ -27,7 +27,6 @@ static int freq;
*/
static void disable_pll(void)
{
#ifdef BOARD_link /* FIXME: crosbug.com/p/19366 */
/* Switch to 16MHz internal oscillator and power down the PLL */
LM4_SYSTEM_RCC = LM4_SYSTEM_RCC_SYSDIV(0) |
LM4_SYSTEM_RCC_BYPASS |
@@ -35,7 +34,6 @@ static void disable_pll(void)
LM4_SYSTEM_RCC_OSCSRC(1) |
LM4_SYSTEM_RCC_MOSCDIS;
LM4_SYSTEM_RCC2 &= ~LM4_SYSTEM_RCC2_USERCC2;
#endif
freq = INTERNAL_CLOCK;
}
@@ -48,7 +46,6 @@ static void enable_pll(void)
/* Disable the PLL so we can reconfigure it */
disable_pll();
#ifdef BOARD_link /* FIXME: crosbug.com/p/19366 */
/*
* Enable the PLL (PWRDN is no longer set) and set divider. PLL is
* still bypassed, since it hasn't locked yet.
@@ -66,7 +63,6 @@ static void enable_pll(void)
/* Remove bypass on PLL */
LM4_SYSTEM_RCC &= ~LM4_SYSTEM_RCC_BYPASS;
#endif
freq = PLL_CLOCK;
}

1
common/charger_bq24707a.c
View File

@@ -180,6 +180,7 @@ int charger_post_init(void)
* input current limit = ~1/2 maximum setting
* charging voltage = 0 mV
* charging current = 0 mA
* IOUT = 20x adapter current sense
*/
/* Set charger input current limit */