Hello,
I'm encountering some challenges while attempting to connect a Bluetooth dongle to a mobile device using a USBHost with a Teensy 4.0. I'm utilizing the USBHost_t36 library, which includes several excellent examples that have generally worked well for me. For instance, I've successfully connected a wireless mouse and keyboard to the USBHost without issues.
However, I'm running into problems when trying to pair my Bluetooth dongle with a mobile device—the program crashes during this process. I’ve experimented with two different approaches using the example code "USBBTDeviceInfo" from the library.
First, I attempted to pair the dongle directly with the mobile device using the code that handles the pairing process. Unfortunately, this resulted in the dongle not being detected at all. Next, I tried pairing the mobile device with the dongle while it was connected to my laptop, then connecting the dongle to the USBHost and attempting to connect from my phone. This method yielded slightly better results but ultimately still led to a crash.
Any insights or suggestions would be greatly appreciated.
I have used two different bluetooth dongles one being Asus USB BT500 and the other CSR 4.0 Dongle which is recommended by https://forum.pjrc.com/index.php?threads/t3-6-usb-host-bluetooth.49358/
Heres the example code:
Heres the outputs on the serial monitor:
Here I have just added the BDADDR, its still basically the same code:
Thanks
I'm encountering some challenges while attempting to connect a Bluetooth dongle to a mobile device using a USBHost with a Teensy 4.0. I'm utilizing the USBHost_t36 library, which includes several excellent examples that have generally worked well for me. For instance, I've successfully connected a wireless mouse and keyboard to the USBHost without issues.
However, I'm running into problems when trying to pair my Bluetooth dongle with a mobile device—the program crashes during this process. I’ve experimented with two different approaches using the example code "USBBTDeviceInfo" from the library.
First, I attempted to pair the dongle directly with the mobile device using the code that handles the pairing process. Unfortunately, this resulted in the dongle not being detected at all. Next, I tried pairing the mobile device with the dongle while it was connected to my laptop, then connecting the dongle to the USBHost and attempting to connect from my phone. This method yielded slightly better results but ultimately still led to a crash.
Any insights or suggestions would be greatly appreciated.
I have used two different bluetooth dongles one being Asus USB BT500 and the other CSR 4.0 Dongle which is recommended by https://forum.pjrc.com/index.php?threads/t3-6-usb-host-bluetooth.49358/
Heres the example code:
C:
// HIDDeviceInfo - Simple HID device example
//
// This Simple test sketch is setup to print out HID information about a device
// The other two tabs are a simple C++ subclass of the USBHIDInput class that is part
// of the USBHost_t36 library.
//
// This subclass simply tries to connect to each different HID object and
// the only thing it does is to try to print out all of the data it receives
// in a reasonable way.
//
// The idea is that with the output from this sketch we can hopefully add support
// for some additional devices that are not currently supported or allows you to
// develop your own.
//
// You can use Serial Input to control how much data is displayed per each HID packet
// received by the sketch.
//
// By Default it displays both the RAW (Hex dump) of the data received, as well
// as the data as the HID interpreter walks through the data into the individual
// fields, which we then print out.
//
// There are options to turn off some of this output, also an option that you can
// toggle on or off (C) to only try to show the changed fields.
//
// This example is in the public domain
#include <USBHost_t36.h>
#include "BTHIDDumper.h"
#include "USBDeviceInfo.h"
USBHost myusb;
USBHub hub1(myusb);
USBHub hub2(myusb);
USBDeviceInfo dinfo(myusb); // will never claim anything...
//BluetoothController bluet(myusb, false, "0000", true); // Version does pairing to device
BluetoothController bluet(myusb); // version assumes it already was paired
BTHIDDumpController hdc1(myusb, 1);
BTHIDDumpController hdc2(myusb, 2);
USBDriver *drivers[] = { &hub1, &hub2, &bluet };
#define CNT_DEVICES (sizeof(drivers) / sizeof(drivers[0]))
const char *driver_names[CNT_DEVICES] = { "Hub1", "Hub2", "BT" };
bool driver_active[CNT_DEVICES] = { false, false, false };
BTHIDDumpController *bthiddrivers[] = { &hdc1, &hdc2 };
#define CNT_BTHIDDEVICES (sizeof(bthiddrivers) / sizeof(bthiddrivers[0]))
const char *bthid_driver_names[CNT_BTHIDDEVICES] = { "HDC1", "HDC2" };
bool bthid_driver_active[CNT_BTHIDDEVICES] = { false, false };
bool show_changed_only = false;
void setup() {
Serial1.begin(2000000);
while (!Serial)
; // wait for Arduino Serial Monitor
if (CrashReport) Serial.print(CrashReport);
Serial.println("\n\nUSB HID Device Info Program");
Serial.println("\nThis Sketch shows information about plugged in HID devices");
Serial.println("\n*** You can control the output by simple character input to Serial ***");
Serial.println("R - Turns on or off showing the raw data");
Serial.println("C - Toggles showing changed data only on or off");
Serial.println("A - Try connecting and printing SDP data again");
Serial.println("P - Start a normal Pairing operation with 0000");
Serial.println("S - Start an SDP pairing operation");
Serial.println("E - Erase Key pairing information");
Serial.println("<anything else> - toggles showing the Hid formatted breakdown of the data\n");
myusb.begin();
}
void loop() {
myusb.Task();
if (Serial.available()) {
int ch = Serial.read(); // get the first char.
while (Serial.read() != -1)
;
if (ch == 'r' || (ch == 'R')) {
if (BTHIDDumpController::show_raw_data) {
BTHIDDumpController::show_raw_data = false;
BTHIDDumpController::show_formated_data = true;
Serial.println("\n*** Turn off RAW output formatted data is on ***\n");
} else {
BTHIDDumpController::show_raw_data = true;
Serial.println("\n*** Turn on RAW output ***\n");
}
} else if (ch == 'a' || (ch == 'A')) {
Serial.println("\n>>>>>>>>>> Try to decode SDP Data <<<<<<<<<<");
if (hdc1) hdc1.decode_SDP_Data(true);
if (hdc2) hdc2.decode_SDP_Data(true);
} else if (ch == 'C' || (ch == 'c')) {
if (BTHIDDumpController::changed_data_only) {
BTHIDDumpController::changed_data_only = false;
Serial.println("***\n Now Showing all data ***\n");
} else {
BTHIDDumpController::changed_data_only = true;
Serial.println("***\n Now Showing changed data only ***\n");
}
} else if (ch == 'P') {
if (bluet.startDevicePairing("0000", false)) {
Serial.println("Pairing operation started with SSP false");
} else {
Serial.println("Staring of Pairing operation failed");
}
} else if (ch == 'S') {
if (bluet.startDevicePairing("0000", true)) {
Serial.println("Pairing operation started with SSP true");
} else {
Serial.println("Staring of Pairing operation failed");
}
} else if (ch == 'E') {
Serial.println("Erase Pairing Link Keys");
bluet.writeLinkKey(nullptr, nullptr); // which should clear all of them. W
} else {
if (BTHIDDumpController::show_formated_data) {
BTHIDDumpController::show_formated_data = false;
BTHIDDumpController::show_raw_data = true; // At least make sure raw raw data is output
Serial.println("\n*** Turn off formatted output formated HID data is on ***\n");
} else {
BTHIDDumpController::show_formated_data = true;
Serial.println("\n*** Turn on formated output ***\n");
}
}
}
for (uint8_t i = 0; i < CNT_DEVICES; i++) {
if (*drivers[i] != driver_active[i]) {
if (driver_active[i]) {
Serial.printf("*** Device %s - disconnected ***\n", driver_names[i]);
driver_active[i] = false;
} else {
Serial.printf("*** Device %s %x:%x - connected ***\n", driver_names[i], drivers[i]->idVendor(), drivers[i]->idProduct());
driver_active[i] = true;
const uint8_t *psz = drivers[i]->manufacturer();
if (psz && *psz) Serial.printf(" manufacturer: %s\n", psz);
psz = drivers[i]->product();
if (psz && *psz) Serial.printf(" product: %s\n", psz);
psz = drivers[i]->serialNumber();
if (psz && *psz) Serial.printf(" Serial: %s\n", psz);
}
}
}
// Then Bluetooth devices
for (uint8_t i = 0; i < CNT_BTHIDDEVICES; i++) {
if (*bthiddrivers[i] != bthid_driver_active[i]) {
if (bthid_driver_active[i]) {
Serial.printf("*** BTHID Device %s - disconnected ***\n", bthid_driver_names[i]);
bthid_driver_active[i] = false;
} else {
Serial.printf("*** BTHID Device %s %x:%x - connected ***\n", bthid_driver_names[i], bthiddrivers[i]->idVendor(), bthiddrivers[i]->idProduct());
bthid_driver_active[i] = true;
const uint8_t *psz = bthiddrivers[i]->manufacturer();
if (psz && *psz) Serial.printf(" manufacturer: %s\n", psz);
psz = bthiddrivers[i]->product();
if (psz && *psz) Serial.printf(" product: %s\n", psz);
psz = bthiddrivers[i]->serialNumber();
if (psz && *psz) Serial.printf(" Serial: %s\n", psz);
// lets dump the SDP data
bthiddrivers[i]->decode_SDP_Data(false);
}
}
}
}Heres the outputs on the serial monitor:
Here I have just added the BDADDR, its still basically the same code:
Thanks
