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windows-h4: add comment about USB driver internal buffers and SCO data

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This commit is contained in:
Matthias Ringwald 2017-01-16 22:43:37 +01:00
parent a09b6c0b68
commit a8bdd0b781
1 changed files with 24 additions and 1 deletions
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25
platform/windows/btstack_uart_block_windows.c
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@ -297,7 +297,30 @@ static int btstack_uart_windows_open(void){
memset(&serial_params, 0, sizeof(DCB));
serial_params.DCBlength = sizeof(DCB);
int ok = GetCommState(serial_port_handle, &serial_params);
int ok;
#if 0
// test - try to set internal buffer
ok = SetupComm(serial_port_handle, 64, 64);
printf("SetupCommL ok %u\n", ok);
#endif
#if 0
// test - read internal buffer sizes
COMMPROP comm_prop;
GetCommProperties(serial_port_handle, &comm_prop);
printf("dwMaxTxQueue %ld\n", comm_prop.dwMaxTxQueue);
printf("dwMaxRxQueue %ld\n", comm_prop.dwMaxRxQueue);
printf("dwCurrentTxQueue %ld\n", comm_prop.dwCurrentTxQueue);
printf("dwCurrentRxQueue %ld\n", comm_prop.dwCurrentRxQueue);
#endif
// Caveat: with the default FTDI driver and a FT232R on Windows 10, the default USB RX/TX buffer sizes are 4096
// this causes a problem when data is received back to back, like with SCO audio data
// Workaround: manually set these values in the Device Manager to 64 bytes
ok = GetCommState(serial_port_handle, &serial_params);
if (!ok){
log_error("windows_open: Couldn't get serial parameters");