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For details see:
https://isocpp.org/wiki/faq/ctors#static-init-order-on-first-use
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The field is now built on-the-fly on the stack and sent over USB.
This change increase Flash usage and decrease SRAM usage:
before: 6114 / 241
after: 6152 / 216 (removed HIDDescriptor field)
delta: +38 / -25
SRAM is a much more scarse resource and this change free up to
about 10% of the "base" usage.
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There is still the epType[] array to be handled in some way.
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This change allows the compiler to handle callbacks resolution.
Callbacks now must be implemented on the class that extends
PUSBListNode and this is forced by compiler by means of pure
virtual methods.
Also the calls to HID.interface() and HID.endpoint() can now
be simplified to interface() and endpoint() respectively since
the methods are no more static.
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This commit prepares for the next refactoring
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The method
int8_t PluggableUSB::addFunction(PUSBListNode *, uint8_t *)
has been changed to
bool PluggableUSB::plug(PUSBListNode *node)
since both EP and Interfaces are now saved directly into node
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This avoid duplicate instatiation of callback and save a
considerable amount of flash.
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See https://github.com/arduino/Arduino/pull/3840#discussion_r40438845
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This simplifies the object model and produce a small gain in code
size and performance.
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In particular HIDDescriptorListNode.cb has been renamed to
HIDDescriptorListNode.descriptor because it contains decriptor data
and not callbacks.
Moreover the HID_Descriptor.descriptor field has been renamed
to HID_Descriptor.data so the structure has now two fields length
and data.
typedef struct __attribute__((packed)) {
uint16_t length;
const void* data;
} HID_Descriptor;
class HIDDescriptorListNode {
public:
HIDDescriptorListNode *next = NULL;
const HID_Descriptor *descriptor;
HIDDescriptorListNode(const HID_Descriptor *d) : descriptor(d) { }
};
This imply a change in the use of the node from:
node->cb->lenght
node->cd->descriptor
to
node->descriptor->length
node->descriptor->data
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with this PR you can add
\#include Keyboard.h
\#include Mouse.h
\#include HID.h
in the top of the sketch and you will expose a Mouse+Keyboard
From the library pow, simply add
static HID_Descriptor cb = {
.length = sizeof(_hidReportDescriptor),
.descriptor = _hidReportDescriptor,
};
static HIDDescriptorListNode node(&cb);
HID.AppendDescriptor(&node);
in the class' constructor and you are done!
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