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Aidan MacDonald 5c1ae51193 echoplayer: implement audio playback 
Playback is implemented using a target-specific PCM layer,
using the STM32H7 SAI & DMA registers directly. There are
a number of pop/click issues:

1. Slight click when powering up the amplifiers
2. Click when starting and stopping playback
3. Popping when changing playback frequency
4. Popping when shutting down

It should be possible to eliminate or at least mitigate
(2) to (4) in software, but (1) happens as a result of
powering on the amplifiers while everything is muted so
might be unavoidable.

Change-Id: I398b66596176fb2341beb7deba7bf6f4f3fb82b3
2026-03-03 09:23:23 -05:00
..
asm Remove Creative Zen Vision and Vision:M ports 2026-02-06 07:31:54 -05:00
common firmware: fat: fix sector_t passed to 64-bit format strings 2025-12-24 09:30:47 -05:00
drivers sdmmc_host: mark tCardInfo initialized at end of card init 2026-03-02 17:11:33 -05:00
export echoplayer: implement audio playback 2026-03-03 09:23:23 -05:00
include elf_loader: add elf_loadmem() to load file from memory 2026-01-25 19:51:07 -05:00
kernel Convert users of SHAREDDATA_ATTR to SHAREDBSS_ATTR 2026-02-05 07:57:07 -05:00
libc lua -- remove strtol and strtoul replace with rb->strtol and rb->strtoul 2025-12-06 18:11:13 -05:00
reggen stm32h743: implement I2C controller interface 2026-02-23 08:19:29 -05:00
target echoplayer: implement audio playback 2026-03-03 09:23:23 -05:00
usbstack usb: fix yellow in eb69211791 2026-01-27 15:23:47 -05:00
arabjoin.c
arabjoin.h unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
ata_idle_notify.c misc: Clean up a large pile of -Wexpansion-to-defined warnings 2025-04-21 21:04:05 -04:00
backlight-sw-fading.c backlight-sw-fading: FS#13717 fix brightness overshoot 2025-12-19 08:20:07 +01:00
backlight.c backlight: Fix dimmed display doesn't go to sleep 2026-02-25 13:07:38 -05:00
bidi.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
buflib_malloc.c buflib_malloc: fixed signed/unsigned comparison 2023-01-16 16:57:23 +00:00
buflib_mempool.c buflib: Add pinned get/put data functions 2023-01-15 11:06:27 +00:00
chunk_alloc.c [BugFix] chunk_alloc pass NULL to buflib_shrink 2023-03-09 20:15:38 -05:00
COPYING
core_alloc.c hosted: Shrink audiobuffer to (MEMORY_SIZE-1) megabytes 2025-09-12 23:15:11 -04:00
debug.c
eeprom_settings.c
elf_loader.c elf_loader: add elf_loadmem() to load file from memory 2026-01-25 19:51:07 -05:00
enc_base.c
events.c
firmware.make make: remove asm.make and use asm/SOURCES directly 2026-01-08 16:41:57 +00:00
font.c font: logf: fix pointer in buflibmove_callback 2026-01-10 07:11:51 +01:00
font_cache.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
general.c
hangul.c unicode: Support characters beyond the first unicode plane 2025-09-12 09:24:30 -04:00
lc-rock.c firmware: introduce CONFIG_BINFMT 2026-01-05 13:14:30 -05:00
linuxboot.c buflib_shrink use NULL to signal start isn't changing 2023-01-13 09:50:29 -05:00
logf.c
lru.c
panic.c arm: add initial ARM Cortex-M support 2025-04-18 13:19:42 -04:00
pcm.c pcm: introduce pcm_sink 2026-03-02 10:09:11 +09:00
pcm_mixer.c plugins: Convert all plugins to using mixer API for playback 2026-02-22 08:15:14 -05:00
pcm_sampr.c
pcm_sw_volume.c pcm: introduce pcm_sink 2026-03-02 10:09:11 +09:00
powermgmt.c misc: Ensure stacks are always aligned with the native pointer size. 2025-09-05 19:43:11 -04:00
profile.c
README
rolo.c nwze370: improve lcd & backlight 2025-10-21 16:54:57 -04:00
rom.lds
screendump.c
scroll_engine.c pass event data to usb_acknowledge 2026-01-26 19:47:09 -05:00
sdmmc.c SD: Move sd_parse_csd() into common sdmmc code 2025-08-22 14:48:28 -04:00
sound.c audio: remove pcm_sw_volume include from sound.c 2026-02-19 14:16:26 -05:00
SOURCES echoplayer: implement audio playback 2026-03-03 09:23:23 -05:00
storage.c bootloaders: Don't build usb_core without HAVE_BOOTLOADER_USB_MODE 2026-02-07 08:46:10 -05:00
system.c
timer.c
tuner.c
usb.c bootloaders: Don't build usb_core without HAVE_BOOTLOADER_USB_MODE 2026-02-07 08:46:10 -05:00

README 

See docs/README