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d67f83a63c
The AC adapter detection isn't measuring the expected values, most likely
because we're not providing enough current for the ADC circuitry to sample.
This tells the ADC to take 64 samples for every reading and average them
together. That seems to fix it.
BUG=chrome-os-partner:19594
BRANCH=none
TEST=manual
To test, use a scope to probe the voltage pin 6 of the AC adapter connector.
Compare that with the measured result from the ADC, by using the EC
console's "adc" command.
Before this change:
Adapter Probed(mV) ADC(mV) error
45W 469 415 11.5%
65W 600 530 11.6%
90W 794 701 11.7%
After this change:
Adapter Probed(mV) ADC(mV) error
45W 469 452 3.6%
65W 600 590 1.6%
90W 794 773 2.6%
Close enough.
Change-Id: I5ab5526934a5a2711969a90a26631d54c7863da7
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/61346
Reviewed-by: Randall Spangler <rspangler@chromium.org>
- EC Lib
This wraps Blizzard driverlib and implements the EC chip interface defined
by Google. See below diagram for architecture.
+--------------------+
| Host BIOS/OS |
+--------------------+
---- host interface ----
+--------------------+
| Google EC features |
+--------------------+
---- chip interface ---- The interface is defined in
src/platform/ec/chip_interface/*.
+--------------------+ But the real implementation is in EC Lib.
| EC Lib |
+--------------------+
| Blizzard low level |
| driver, the |
| driverlib. |
+--------------------+
Build Options
=============
- CONFIG_WATCHDOG_HELP
Try to detect a watchdog that is about to fire, and print a trace.
This is needed on STM32, where the independent watchdog has no early
warning feature and the windowed watchdog has a very short period.
- CONFIG_PANIC_HELP
Report extra information about a panic, such as the fault address,
here shown as bfar. This shows the reason for the fault and may help
to determine the cause.
=== EXCEPTION: 03 ====== xPSR: 01000000 ===========
r0 :0000000b r1 :00000047 r2 :60000000 r3 :200013dd
r4 :00000000 r5 :080053f4 r6 :200013d0 r7 :00000002
r8 :00000000 r9 :200013de r10:00000000 r11:00000000
r12:00000000 sp :200009a0 lr :08002b85 pc :08003a8a
Precise data bus error, Forced hard fault, Vector catch, bfar = 60000000
mmfs = 00008200, shcsr = 00000000, hfsr = 40000000, dfsr = 00000008
- CONFIG_ASSERT_HELP
Report assertion failures in a vebose manner to aid debugging. When
enabled an ASSERT() which fails will produce message in the form:
ASSERTION FAILURE '<expr>' in function() at file:line
- CONFIG_AC_POWER_STATUS
Monitor the state of the AC power input and drive out a GPIO to
the AP indicating this state. The GPIO will be driven low when
AC power is not connected, and high when it is connected. This
uses GPIO_AC_STATUS for this purpose.
- CONFIG_PMU_FORCE_FET
Force switching on and off the FETs on the PMU controlling various
power rails during AP startup and shutdown sequences.
This is mainly useful for bringup when we don't have the corresponding
sequences in the AP code.
- CONFIG_KEYBOARD_TEST
Turn on keyboard testing functionality. This enables a message which
received a list of keyscan events from the AP and processes them.
This will cause keypresses to appear on the AP through the same
mechanism as a normal keyboard press.