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[AVR] USB send ZLP when needed 

See #5732 #4864 #4138 #3946
This commit is contained in:
Cristian Maglie 2017-01-04 18:40:13 +01:00 committed by Cristian Maglie
parent f27e8fe194
commit 3b0765979d
1 changed files with 18 additions and 4 deletions
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22
cores/arduino/USBCore.cpp
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@ -273,7 +273,9 @@ int USB_Send(u8 ep, const void* d, int len)
int r = len;
const u8* data = (const u8*)d;
u8 timeout = 250; // 250ms timeout on send? TODO
while (len)
bool sendZlp = false;
while (len || sendZlp)
{
u8 n = USB_SendSpace(ep);
if (n == 0)
@ -284,13 +286,16 @@ int USB_Send(u8 ep, const void* d, int len)
continue;
}
if (n > len)
if (n > len) {
n = len;
}
{
LockEP lock(ep);
// Frame may have been released by the SOF interrupt handler
if (!ReadWriteAllowed())
continue;
len -= n;
if (ep & TRANSFER_ZERO)
{
@ -307,8 +312,17 @@ int USB_Send(u8 ep, const void* d, int len)
while (n--)
Send8(*data++);
}
if (!ReadWriteAllowed() || ((len == 0) && (ep & TRANSFER_RELEASE))) // Release full buffer
if (sendZlp) {
ReleaseTX();
sendZlp = false;
} else if (!ReadWriteAllowed()) { // ...release if buffer is full...
ReleaseTX();
if (len == 0) sendZlp = true;
} else if ((len == 0) && (ep & TRANSFER_RELEASE)) { // ...or if forced with TRANSFER_RELEASE
// XXX: TRANSFER_RELEASE is never used can be removed?
ReleaseTX();
}
}
}
TXLED1; // light the TX LED
@ -473,7 +487,7 @@ static
bool SendConfiguration(int maxlen)
{
// Count and measure interfaces
InitControl(0);
InitControl(0);
u8 interfaces = SendInterfaces();
ConfigDescriptor config = D_CONFIG(_cmark + sizeof(ConfigDescriptor),interfaces);