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Set string descriptor length to the string length + 2, and send up to wLength bytes

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This commit is contained in:
Sandeep Mistry 2016-01-26 17:14:40 -05:00
parent c3d2bbdb86
commit aeec344b21
1 changed files with 14 additions and 8 deletions
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22
hardware/arduino/sam/cores/arduino/USB/USBCore.cpp
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@ -258,15 +258,21 @@ int USBD_SendControl(uint8_t flags __attribute__ ((unused)), const void* d, uint
// plain ASCII string but is sent out as UTF-16 with the
// correct 2-byte prefix
static bool USB_SendStringDescriptor(const uint8_t *string, int wLength) {
uint16_t buff[64];
int l = 1;
wLength-=2;
while (*string && wLength>0) {
buff[l++] = (uint8_t)(*string++);
wLength-=2;
if (wLength < 2)
return false;
uint8_t buffer[wLength];
buffer[0] = strlen((const char*)string) * 2 + 2;
buffer[1] = 0x03;
uint8_t i;
for (i = 2; i < wLength && *string; i++) {
buffer[i++] = *string++;
if (i == wLength) break;
buffer[i] = 0;
}
buff[0] = (3<<8) | (l*2);
return USBD_SendControl(0, (uint8_t*)buff, l*2);
return USBD_SendControl(0, (uint8_t*)buffer, i);
}
// Does not timeout or cross fifo boundaries