example - add main_usbhost.cc - from libdaisy, works. but only with device class midi, cause hub is another device class

examples/main_usbhost.cc

@@ -0,0 +1,145 @@
+/** Example of setting reading MIDI Input via USB Host
+*
+*
+*  This requires a USB-A connector
+*
+*  This example will also log incoming messages to the serial port for general MIDI troubleshooting
+*/
+#include "daisy_seed.h"
+#include "usbh_midi.h"
+
+/** This prevents us from having to type "daisy::" in front of a lot of things. */
+using namespace daisy;
+
+/** Global Hardware access */
+DaisySeed       hw;
+MidiUsbHandler midi;
+USBHostHandle usbHost;
+
+/** FIFO to hold messages as we're ready to print them */
+FIFO<MidiEvent, 128> event_log;
+
+void USBH_Connect(void* data)
+{
+   hw.PrintLine("device connected");
+}
+
+void USBH_Disconnect(void* data)
+{
+   hw.PrintLine("device disconnected");
+}
+
+void USBH_ClassActive(void* data)
+{
+   if(usbHost.IsActiveClass(USBH_MIDI_CLASS))
+   {
+       hw.PrintLine("MIDI device class active");
+       MidiUsbHandler::Config midi_config;
+       midi_config.transport_config.periph = MidiUsbTransport::Config::Periph::HOST;
+       midi.Init(midi_config);
+       midi.StartReceive();
+   }
+}
+
+void USBH_Error(void* data)
+{
+   hw.PrintLine("USB device error");
+}
+
+int main(void)
+{
+   /** Initialize our hardware */
+   hw.Init();
+
+   hw.StartLog(true);
+
+   hw.PrintLine("MIDI USB Host start");
+
+   /** Configure USB host */
+   USBHostHandle::Config usbhConfig;
+   usbhConfig.connect_callback = USBH_Connect,
+   usbhConfig.disconnect_callback = USBH_Disconnect,
+   usbhConfig.class_active_callback = USBH_ClassActive,
+   usbhConfig.error_callback = USBH_Error,
+   usbHost.Init(usbhConfig);
+
+   usbHost.RegisterClass(USBH_MIDI_CLASS);
+
+   uint32_t now      = System::GetNow();
+   uint32_t log_time = System::GetNow();
+   uint32_t blink_time = 0;
+   bool ledState = false;
+
+   hw.PrintLine("MIDI USB Host initialized");
+
+   /** Infinite Loop */
+   while(1)
+   {
+       now = System::GetNow();
+
+       if (now > blink_time)
+       {
+           hw.SetLed(ledState);
+           ledState = !ledState;
+           if (usbHost.GetPresent())
+               blink_time = now + 400;
+           else
+               blink_time = now + 80;
+       }
+       /** Run USB host process */
+       usbHost.Process();
+
+       if(usbHost.IsActiveClass(USBH_MIDI_CLASS) && midi.RxActive())
+       {
+           /** Process MIDI in the background */
+           midi.Listen();
+
+           /** Loop through any MIDI Events */
+           while(midi.HasEvents())
+           {
+               MidiEvent msg = midi.PopEvent();
+
+               /** Handle messages as they come in
+                *  See DaisyExamples for some examples of this
+                */
+               switch(msg.type)
+               {
+                   case NoteOn:
+                       // Do something on Note On events
+                       {
+                           uint8_t bytes[3] = {0x90, 0x00, 0x00};
+                           bytes[1] = msg.data[0];
+                           bytes[2] = msg.data[1];
+                           midi.SendMessage(bytes, 3);
+                       }
+                       break;
+                   default: break;
+               }
+
+               /** Regardless of message, let's add the message data to our queue to output */
+               event_log.PushBack(msg);
+           }
+
+           /** Now separately, every 5ms we'll print the top message in our queue if there is one */
+           if(now - log_time > 5)
+           {
+               log_time = now;
+               if(!event_log.IsEmpty())
+               {
+                   auto msg = event_log.PopFront();
+                   char outstr[128];
+                   const char* type_str = MidiEvent::GetTypeAsString(msg);
+                   sprintf(outstr,
+                           "time:\t%ld\ttype: %s\tChannel:  %d\tData MSB: "
+                           "%d\tData LSB: %d\n",
+                           now,
+                           type_str,
+                           msg.channel,
+                           msg.data[0],
+                           msg.data[1]);
+                   hw.PrintLine(outstr);
+               }
+           }
+       }
+   }
+}