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Commit Graph

8 Commits

Author SHA1 Message Date
James Cotton
72625d9971 PiOS RCVR: Make the public API use a 1 based indexing for channel numbers.
This may or may not get into next, but if so anyone following it MUST
reconfigure their inputs.
2011-09-06 16:39:08 -05:00
James Cotton
8f7712435f Merge branch 'safer_failsafe' into next 2011-09-06 16:23:11 -05:00
James Cotton
82c5f9f0f4 PIOS_RCVR: Document return values better and use enum for them 2011-09-04 12:37:39 -05:00
James Cotton
697dbf4f5f OP-568 PIOS_RCVR: Standardize the values that are returned from the PIOS_RCVR and make
them symbolic constants.
- A timeout is 0
- A missing driver is 65534
- An invalid channel is 65535

ManualControl: Make it deal with the values explicitly.  A timed out value
should not be treated like a minimum duration signal.  Instead it does not
updated the scaled value but marks the data window as invalid to trigger the
failsafe.
2011-09-03 23:50:56 -05:00
Stacey Sheldon
43b31efb76 pios: allocate driver instance data from heap
Allocate per-instance data for drivers from the heap
rather than as static variables from the .data segment.

This converts > 800 bytes of RAM from being always consumed
as static data into being allocated from the heap only when
a particular feature is enabled in the hwsettings object.

A minimal config (no receivers, flexi port disabled, main port
disabled) leaves 2448 bytes of free heap.  That's our new baseline.

Approximate RAM (heap) costs of enabling various features:
 + 632 Serial Telemetry (includes 400 bytes of Rx/Tx buffers)
 + 108 PWM Rcvr
 + 152 PPM Rcvr
 + 112 Spektrum Rcvr
 + 24  S.Bus (Should be closer to 68 since driver is still using
              static memory)

There are still some drivers that pre-allocate all of their memory
as static data.  It'll take some work to convert those over to
dynamically allocating their instance data.
2011-08-31 22:35:03 -04:00
Stacey Sheldon
5f8760a55c com: Move buffering out of USART/HID layer and into COM layer
This allows the spektrum and sbus receiver drivers to bind
directly to the usart layer using a properly exported API
rather than overriding the interrupt handler.

Bytes are now pushed directly from the usart layer into the
com layer without any buffering.  The com layer performs all
of the buffering.

A further benefit from this approach is that we can put all
blocking/non-blocking behaviour into the COM layer and not
in the underlying drivers.

Misc related changes:
 - Remove obsolete .handler field from irq configs
 - Adapt all users of PIOS_COM_* functions to new API
 - Fixup callers of PIOS_USB_HID_Init()
2011-07-27 19:45:38 -04:00
Stacey Sheldon
6580462916 rcvr: specify drivers for groups of channels
Each channel was previously tracking a separate driver.
Now, channels are grouped within a channel group to save
RAM used for tracking and to better reflect how channels
are actually mapped.
2011-07-14 23:22:42 -04:00
Stacey Sheldon
e77795dc28 rcvr: add generic driver API for receivers
Will be used to collapse PWM, PPM, Spektrum and SBUS so we
can choose between them at boot time instead of at compile time.
2011-07-05 22:02:47 -04:00