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libusb: document alternate settings for interface 1

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This commit is contained in:
Matthias Ringwald 2016-01-15 22:41:42 +01:00
parent bd11d3d68e
commit 0aa6c1da66
1 changed files with 11 additions and 2 deletions
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13
platforms/posix/src/hci_transport_h2_libusb.c
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@ -603,9 +603,18 @@ static int prepare_device(libusb_device_handle * aHandle){
libusb_close(aHandle);
return r;
}
r = libusb_set_interface_alt_setting(aHandle, 1, 1); // 1 x 8 kHz voice channels, 8 bit
// Bluetooth USB Transprot Alternate Settings:
// 0: No active voice channels (for USB compliance)
// 1: One 8 kHz voice channel with 8-bit encoding
// 2: Two 8 kHz voice channels with 8-bit encoding or one 8 kHz voice channel with 16-bit encoding
// 3: Three 8 kHz voice channels with 8-bit encoding
// 4: Two 8 kHz voice channels with 16-bit encoding or one 16 kHz voice channel with 16-bit encoding
// 5: Three 8 kHz voice channels with 16-bit encoding or one 8 kHz voice channel with 16-bit encoding and one 16 kHz voice channel with 16-bit encoding
int alt_setting = 1;
log_info("Switching to setting %u on interface 1..", alt_setting);
r = libusb_set_interface_alt_setting(aHandle, 1, alt_setting);
if (r < 0) {
fprintf(stderr, "Error setting alternative setting 5 for interface 1: %s\n", libusb_error_name(r));
fprintf(stderr, "Error setting alternative setting %u for interface 1: %s\n", alt_setting, libusb_error_name(r));
libusb_close(aHandle);
return r;
}