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Send a ZLP if data size is multiple of the endpoint size for USB sends in SAM core #4172

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Send a ZLP if data size is multiple of the endpoint size for USB sends in SAM core #4172

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f1cdd5f
Split out endpoint size into variable
sandeepmistry Nov 13, 2015
d0f5d0f
Send ZLP is data size is non-zero and a multiple of the endpoint size
sandeepmistry Nov 13, 2015
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8 changes: 6 additions & 2 deletions hardware/arduino/sam/cores/arduino/USB/USBCore.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -195,6 +195,7 @@ uint32_t USBD_Send(uint32_t ep, const void* d, uint32_t len)
{
uint32_t n;
int r = len;
uint32_t epSize = (ep==0) ? EP0_SIZE : EPX_SIZE;
const uint8_t* data = (const uint8_t*)d;

if (!_usbConfiguration)
Expand All @@ -205,15 +206,18 @@ uint32_t USBD_Send(uint32_t ep, const void* d, uint32_t len)

while (len)
{
if(ep==0) n = EP0_SIZE;
else n = EPX_SIZE;
n = epSize;
if (n > len)
n = len;
len -= n;

UDD_Send(ep & 0xF, data, n);
data += n;
}

if ((r != 0) && (r % epSize) == 0)
UDD_Send(ep & 0xF, NULL, 0);

//TXLED1; // light the TX LED
//TxLEDPulse = TX_RX_LED_PULSE_MS;
return r;
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