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  1. 24f527b Add one Android.bp am: 3a08682315 am: eecd7280ee am: d65535a89e am: 0a4748634c by Yuntao Xu · 1 year, 11 months ago android13-d2-release android13-d3-s1-release android13-d4-release android13-d4-s1-release android13-d4-s2-release android13-dev android13-frc-adbd-release android13-frc-art-release android13-frc-cellbroadcast-release android13-frc-conscrypt-release android13-frc-odp-release android13-mainline-adservices-release android13-mainline-appsearch-release android13-mainline-go-adbd-release android13-mainline-go-adservices-release android13-mainline-go-appsearch-release android13-mainline-go-media-swcodec-release android13-mainline-go-mediaprovider-release android13-mainline-go-networking-release android13-mainline-go-neuralnetworks-release android13-mainline-go-odp-release android13-mainline-go-os-statsd-release android13-mainline-go-permission-release android13-mainline-go-resolv-release android13-mainline-go-scheduling-release android13-mainline-go-sdkext-release android13-mainline-go-tethering-release android13-mainline-go-tzdata4-release android13-mainline-go-uwb-release android13-mainline-go-wifi-release android13-mainline-tzdata4-release android13-mainline-uwb-release android13-qpr1-release android13-qpr1-s1-release android13-qpr1-s2-release android13-qpr1-s3-release android13-qpr1-s4-release android13-qpr1-s5-release android13-qpr1-s6-release android13-qpr1-s7-release android13-qpr1-s8-release android13-qpr2-b-s1-release android13-qpr2-release android13-qpr2-s1-release android13-qpr2-s10-release android13-qpr2-s11-release android13-qpr2-s12-release android13-qpr2-s2-release android13-qpr2-s3-release android13-qpr2-s5-release android13-qpr2-s6-release android13-qpr2-s7-release android13-qpr2-s8-release android13-qpr2-s9-release android13-qpr3-c-s1-release android13-qpr3-c-s10-release android13-qpr3-c-s11-release android13-qpr3-c-s12-release android13-qpr3-c-s2-release android13-qpr3-c-s3-release android13-qpr3-c-s4-release android13-qpr3-c-s5-release android13-qpr3-c-s6-release android13-qpr3-c-s7-release android13-qpr3-c-s8-release android13-qpr3-release android13-qpr3-s1-release android13-qpr3-s10-release android13-qpr3-s11-release android13-qpr3-s12-release android13-qpr3-s13-release android13-qpr3-s2-release android13-qpr3-s3-release android13-qpr3-s4-release android13-qpr3-s5-release android13-qpr3-s6-release android13-qpr3-s7-release android13-qpr3-s8-release android13-qpr3-s9-release main main-16k main-16k-with-phones master aml_ads_331131000 aml_ads_331418080 aml_ads_331511020 aml_ads_331611190 aml_ads_331710270 aml_ads_331814200 aml_ads_331920180 aml_ase_331011020 aml_ase_331112000 aml_ase_331311020 aml_go_adb_330913000 aml_go_ads_330913000 aml_go_ads_330915000 aml_go_ads_330915100 aml_go_ase_330913000 aml_go_mpr_330912000 aml_go_net_330913000 aml_go_neu_330912000 aml_go_odp_330912000 aml_go_odp_330913000 aml_go_per_330912000 aml_go_res_330912000 aml_go_sch_330911000 aml_go_sdk_330810000 aml_go_sta_330911000 aml_go_swc_330913000 aml_go_tet_330914010 aml_go_tz4_330912000 aml_go_uwb_330912000 aml_go_wif_330911000 aml_tz4_331012000 aml_tz4_331012040 aml_tz4_331012050 aml_tz4_331314010 aml_tz4_331314020 aml_tz4_331314030 aml_tz4_331910000 aml_uwb_330810010 aml_uwb_331015040 aml_uwb_331115000 aml_uwb_331310030 aml_uwb_331410010 aml_uwb_331611010 aml_uwb_331613010 aml_uwb_331820070 aml_uwb_331910010 android-13.0.0_r16 android-13.0.0_r17 android-13.0.0_r18 android-13.0.0_r19 android-13.0.0_r20 android-13.0.0_r21 android-13.0.0_r22 android-13.0.0_r23 android-13.0.0_r24 android-13.0.0_r27 android-13.0.0_r28 android-13.0.0_r29 android-13.0.0_r30 android-13.0.0_r32 android-13.0.0_r33 android-13.0.0_r34 android-13.0.0_r35 android-13.0.0_r36 android-13.0.0_r37 android-13.0.0_r38 android-13.0.0_r39 android-13.0.0_r40 android-13.0.0_r41 android-13.0.0_r42 android-13.0.0_r43 android-13.0.0_r44 android-13.0.0_r45 android-13.0.0_r46 android-13.0.0_r47 android-13.0.0_r48 android-13.0.0_r49 android-13.0.0_r50 android-13.0.0_r51 android-13.0.0_r52 android-13.0.0_r53 android-13.0.0_r54 android-13.0.0_r55 android-13.0.0_r56 android-13.0.0_r57 android-13.0.0_r58 android-13.0.0_r59 android-13.0.0_r60 android-13.0.0_r61 android-13.0.0_r62 android-13.0.0_r63 android-13.0.0_r64 android-13.0.0_r65 android-13.0.0_r66 android-13.0.0_r67 android-13.0.0_r68 android-13.0.0_r69 android-13.0.0_r70 android-13.0.0_r71 android-13.0.0_r72 android-13.0.0_r73 android-13.0.0_r74 android-13.0.0_r75 android-13.0.0_r76 android-13.0.0_r77 android-13.0.0_r78 android-13.0.0_r79 android-13.0.0_r80 android-13.0.0_r81 android-13.0.0_r82 android-u-beta-1-gpl t_frc_adb_330444000 t_frc_art_330443060 t_frc_ase_330444010 t_frc_cbr_330443000 t_frc_con_330443020 t_frc_odp_330442000 t_frc_odp_330442040
  2. 0a47486 Add one Android.bp am: 3a08682315 am: eecd7280ee am: d65535a89e by Yuntao Xu · 1 year, 11 months ago
  3. d65535a Add one Android.bp am: 3a08682315 am: eecd7280ee by Yuntao Xu · 1 year, 11 months ago
  4. eecd728 Add one Android.bp am: 3a08682315 by Yuntao Xu · 1 year, 11 months ago android-s-qpr3-beta-1 android-s-v2-beta-3 android-t-preview-1 android-s-qpr3-beta-1 android-s-v2-beta-3 android-t-beta-3 android-t-preview-1 android-t-preview-2
  5. 3a08682 Add one Android.bp by Yuntao Xu · 1 year, 11 months ago

WALT Latency Timer

DISCLAIMER: This is not an official Google product.

WALT is designed to measure the latency of physical sensors and outputs on phones and computers. It can currently perform the following measurements:

  • Tap latency - time from the moment a finger-like probe touches down (or up) on the screen until the kernel timestamps an ACTION_DOWN (or ACTION_UP) event. This physical contact with the screen is timed using an accelerometer mounted on the probe.
  • Drag latency (scroll).
  • Screen draw latency - using a photodiode that detects whether the screen is black or white.
  • Audio output and microphone latencies.
  • MIDI input and output latencies

The WALT app for Android can be installed from Google Play or downloaded in the releases section; the iOS app must be built from source.

WALT photo

Notes

  • Hardware build instructions can be found in this repository under hardware/.
  • Clock synchronization details are described here.
  • The Android/iOS device and Teensy clocks have a tendency to diverge due to differing clock frequencies. This means they will go out of sync after several minutes. The workaround is to use the app to re-sync the clocks. Some, but not all tests in the app will sync the clocks when starting a measurement.
  • Python code used to communicate with WALT from Linux and ChromeOS can be found here.