Use the PWM hardware to generate a signal suitable for filtering and
amplifying 16bps audio output.
Refactor the AudioBufferManager to allow sharing with I2S
Add example
The ring buffer worked but had issues with IRQs and the available()
procesing. Because it was a pain to debug, move to a linked list
setup where there are filled and empty buffers to work from,
simplifying the underlying logic.
Allow I2S::available() to return free writing space in OUTPUT mode
to make it saner.
* Increase default number of buffers for 32bps
Gives 2x the time between interrutps to handle I2S callbacks.
* Add setBuffers keyword
Fixes#963
The available space calculation didn't account for the fact that one
of the buffers was currently being output, causing ::available() to
be too large and ::write() to block in that case.
Other parts of the core use temp 256 byte chunks to transmit/move/operate
on data, so do the same here. Will increase effective WebServer sendFile
speeds.
SingleFileDisk allows for exporting a file from the onboard LittleFS
filesystem to a PC through an emulated FAT drive when connected. The
PC can open and copy the file, as well as delete it, but the PC has no
access to the main onboard LittleFS and no actual on-flash FAT
structures are used.
This is handy for things like data loggers. They can run connected to
USB power for some time, and then connected to a PC to dowmload the CSV
log recorded.
It's almost 2023, allow LFN (long file names) on the emulated USB disk.
Reduce the disk buffer size to 64 bytes. The buffer is statically
allocated so it's always present, even in non-USB disk mode, meaning
all apps will pay the RAM price for it. 64 bytes is slower to read
but works and saves ~1/2KB of heap for all apps.
Fixes#1021
The UART hardware will push characters into the receive FIFO even if there
are parity, framing, or other errors. These are invalid and shouldn't be
returned to the application, so drop them if errors detected.
This will also avoid the glitch-induced initial garbage character.
Previously, File::readString used a C-style string as an intermediate
buffer via the String += operator. This treats a NUL byte as a
terminator, making this function work incorrectly if the File contains
binary data.
This commit switches the function to use String::concat, which doesn't
treat NUL bytes any differently (and is a bit faster, because it doesn't
need to use strlen).
When receiving a `QUIT` message, the main thread was trying to tell
the scanner thread to quit - however, what it was actually doing was
creating a local variable that shadowed the global flag used by the
scanner thread. Fix that by ensuring that the main thread uses the
global variable instead.
Fixes#1028
The memcpy to unallocated memory was done in two cases:
1) The 'size' parameter was not multiple of 256.
2) The begin() was called two times and the 2nd call 'size' was greater than 1st time 'size'. (e.g. 1st size=256, 2nd size=512)
Fixes#979
Make sure to read the last byte of I2C data in the case where the IRQ happens
and the STOP signal is also asserted.
Also ensure all branches of the IRQ handler look at the same point in time
value for the IRQ status.
* add rough for scorpio
* Add SCORPIO items from ladyada
* Change PID in makeboards.py instead of boards.txt
* Fix PID in scorpio JSON
* README: Add Feather SCORPIO to supported boards
* Fix PIDs using values from MBAdafruitBoards
Still unsure about pid.[1-7] but let's see what happens
* boards.txt fixed by running makeboards.py
Co-authored-by: lady ada <limor@ladyada.net>
The PWM internals on the RP2040 are based on 8 slices with independent
clocking. Make sure that we init the PWM slice being used only once per
change of frequency/range.
Only init the scaling values one time, because we also adjust the input
scale/frequency values when calculating them. If we ran this twice (i.e.
writing to two slices), it would overwrite the pseudo scale/slow scale
values with 1 causing the wrong PWM values to be set.
Fixes#955
