nodemcu-firmware/lua_examples/pcm/play_file.lua

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-- ****************************************************************************
-- Play file with pcm module.
--
-- Upload jump_8k.u8 to spiffs before running this script.
--
-- ****************************************************************************
function cb_drained(d)
print("drained "..node.heap())
file.seek("set", 0)
-- uncomment the following line for continuous playback
--d:play(pcm.RATE_8K)
end
function cb_stopped(d)
print("playback stopped")
file.seek("set", 0)
end
function cb_paused(d)
print("playback paused")
end
file.open("jump_8k.u8", "r")
drv = pcm.new(pcm.SD, 1)
-- fetch data in chunks of LUA_BUFFERSIZE (1024) from file
drv:on("data", file.read)
-- get called back when all samples were read from the file
drv:on("drained", cb_drained)
drv:on("stopped", cb_stopped)
drv:on("paused", cb_paused)
-- start playback
drv:play(pcm.RATE_8K)