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Bluetooth: ISO: Speed up BT ISO data processing

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For the native posix build the sleep calls used in tasks will stall
the zephyr instance which sets an upper limit on the data processing
interval to once every 20-30 millisecond.
This change reduces the duration of the sleep calls and increases the
TICKS_PER_SECOND to allow for shorter sleeps. This is needed to
support the data rates needed for LE Audio streaming. The rate is
tuned to support up to bidirectional 5ms ISO-intervals.
This change also increases the ISO buffer count from 1 to 5 to
allow for some buffering in the controller, which is needed for
gapless playback and/or use of burst number larger than 1.

Signed-off-by: Casper Bonde <casper_bonde@bose.com>
This commit is contained in:
Casper Bonde 2021-03-29 10:19:12 +02:00 • committed by Carles Cufí
commit afe469eac7
3 changed files with 11 additions and 2 deletions
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2
drivers/bluetooth/hci/userchan.c
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@ -106,7 +106,7 @@ static void rx_thread(void *p1, void *p2, void *p3)
ssize_t len;
if (!uc_ready()) {
k_sleep(K_MSEC(20));
k_sleep(K_MSEC(1));
continue;
}

9
tests/bluetooth/shell/boards/native_posix.conf Normal file
View file

@ -0,0 +1,9 @@
CONFIG_NO_OPTIMIZATIONS=y
# Allows for copying larger amount of data into the shell
CONFIG_SHELL_BACKEND_SERIAL_RX_RING_BUFFER_SIZE=4096
# For native posix k_sleep is used in the data path as well as for shell input
# detection, hence data processing is at least two ticks per packet. To support
# 5ms ISO interval bidirectional data the system shall never stall for more
# than 1.5 ms in average.
CONFIG_SYS_CLOCK_TICKS_PER_SEC=500

2
tests/bluetooth/shell/prj.conf
View file

@ -50,7 +50,7 @@ CONFIG_BT_AUTO_PHY_UPDATE=y
CONFIG_BT_AUDIO=y
CONFIG_BT_AUDIO_UNICAST=y
CONFIG_BT_AUDIO_BROADCAST=y
CONFIG_BT_ISO_TX_BUF_COUNT=5
CONFIG_BT_VOCS_MAX_INSTANCE_COUNT=1
CONFIG_BT_VOCS_CLIENT_MAX_INSTANCE_COUNT=1