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Fix libusb_bulk_transfer timeout on some Android devices #19

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Fix libusb_bulk_transfer timeout on some Android devices #19

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28a42d6
Reduce buffer size
floppyhammer Mar 21, 2026
1129fe7
Reduce aggregation
floppyhammer Mar 21, 2026
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13 changes: 7 additions & 6 deletions src/RtlUsbAdapter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -21,13 +21,13 @@ RtlUsbAdapter::RtlUsbAdapter(libusb_device_handle *dev_handle, Logger_t logger)

if (usbSpeed > LIBUSB_SPEED_HIGH) // USB 3.0
{
rxagg_usb_size = 0x7;
rxagg_usb_timeout = 0x1a;
rxagg_usb_size = 0x3; // 16KB
rxagg_usb_timeout = 0x01;
} else {
/* the setting to reduce RX FIFO overflow on USB2.0 and increase rx
/* the setting to reduce RX FIFO overflow on USB2.0 and increase rx
* throughput */
rxagg_usb_size = 0x5;
rxagg_usb_timeout = 0x20;
rxagg_usb_size = 0x1; // 8KB
rxagg_usb_timeout = 0x01;
}

GetChipOutEP8812();
Expand Down Expand Up @@ -56,7 +56,8 @@ RtlUsbAdapter::RtlUsbAdapter(libusb_device_handle *dev_handle, Logger_t logger)
*/

std::vector<Packet> RtlUsbAdapter::infinite_read() {
uint8_t buffer[65000] = {0};
static constexpr int BUF_SIZE = 16 * 1024;
uint8_t buffer[BUF_SIZE] = {};
int actual_length = 0;
int rc;

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