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Add serial read-length handling.

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px4dev
2013-05-22 22:09:00 +02:00
parent 437d9e4180
commit 308ec6001a
2 changed files with 13 additions and 6 deletions
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src/modules/px4iofirmware/protocol.h
+7 -4
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@@ -36,7 +36,8 @@
/**
* @file protocol.h
*
* PX4IO interface protocol.
* PX4IO interface protocol
* ========================
*
* Communication is performed via writes to and reads from 16-bit virtual
* registers organised into pages of 255 registers each.
@@ -63,19 +64,21 @@
* readable pages to be densely packed. Page numbers do not need to be
* packed.
*
* PX4IO I2C interface notes:
* PX4IO I2C interface notes
* -------------------------
*
* Register read/write operations are mapped directly to PX4IO register
* read/write operations.
*
* PX4IO Serial interface notes:
* PX4IO Serial interface notes
* ----------------------------
*
* The MSB of the page number is used to distinguish between read and
* write operations. If set, the operation is a write and additional
* data is expected to follow in the packet as for I2C writes.
*
* If clear, the packet is expected to contain a single byte giving the
* number of bytes to be read. PX4IO will respond with a packet containing
* number of registers to be read. PX4IO will respond with a packet containing
* the same header (page, offset) and the requested data.
*
* If a read is requested when PX4IO does not have buffer space to store