/* Requests Configuration Descriptor. Sends two Get Conf Descr requests. The first one gets the total length of all descriptors, then the second one requests this
total length. The length of the first request can be shorter ( 4 bytes ), however, there are devices which won't work unless this length is set to 9 */
uint8_t USB::getConfDescr(uint8_t addr, uint8_t ep, uint8_t conf, USBReadParser *p) {
const uint8_t bufSize = 64;
uint8_t buf[bufSize];
USB_CONFIGURATION_DESCRIPTOR *ucd = reinterpret_cast<USB_CONFIGURATION_DESCRIPTOR *>(buf);
uint8_t ret = getConfDescr(addr, ep, 9, conf, buf);
if (ret) return ret;
uint16_t total = ucd->wTotalLength;
//USBTRACE2("\r\ntotal conf.size:", total);
return ctrlReq(addr, ep, bmREQ_GET_DESCR, USB_REQUEST_GET_DESCRIPTOR, conf, USB_DESCRIPTOR_CONFIGURATION, 0x0000, total, bufSize, buf, p);
}
uint8_t UsbHost_::getConfDescr( uint8_t addr, uint8_t ep, uint8_t conf, USBReadParser *p )
{
const uint8_t bufSize = 64;
uint8_t buf[bufSize];
uint8_t ret = getConfDescr( addr, ep, 8, conf, buf );
if (ret)
return ret;
uint16_t total = ((USB_CONFIGURATION_DESCRIPTOR*)buf)->wTotalLength;
//USBTRACE2("\r\ntotal conf.size:", total);
return( ctrlReq( addr, ep, bmREQ_GET_DESCR, USB_REQUEST_GET_DESCRIPTOR, conf, USB_DESCRIPTOR_CONFIGURATION, 0x0000, total, bufSize, buf, p ));
}
uint8_t USB::getConfDescr(uint8_t addr, uint8_t ep, uint8_t conf, USBReadParser *p) {
const uint32_t bufSize = 256; //64; due to receiving more than 1 packet (64bytes) in stm imple.
// we need a large buffer for BTD class, which has a 177 bytes desc.
uint8_t buf[bufSize];
uint8_t ret = getConfDescr(addr, ep, 8, conf, buf);
if (ret)
return ret;
uint16_t total = ((USB_CONFIGURATION_DESCRIPTOR*)buf)->wTotalLength;
//USBTRACE2("\r\ntotal conf.size:", total);
return ( ctrlReq(addr, ep, bmREQ_GET_DESCR, USB_REQUEST_GET_DESCRIPTOR, conf, USB_DESCRIPTOR_CONFIGURATION, 0x0000, total, bufSize, buf, p));
}
