RawHID compiles (empty functions) and auto-reboot works

teensy4/startup.c

 	set_arm_clock(600000000);
 	//set_arm_clock(984000000); Ludicrous Speed
 
+	asm volatile("nop\n nop\n nop\n nop": : :"memory"); // why oh why?
+
 	// initialize RTC
 	if (!(SNVS_LPCR & SNVS_LPCR_SRTC_ENV)) {
 		// if SRTC isn't running, start it with default Jan 1, 2019

teensy4/usb.c

 		endpoint0_setupdata.bothwords = setupdata;
 		endpoint0_receive(endpoint0_buffer, 7, 1);
 		return;
+#endif
+#if defined(SEREMU_INTERFACE) || defined(KEYBOARD_INTERFACE)
+	  case 0x0921: // HID SET_REPORT
+		if (setup.wLength <= sizeof(endpoint0_buffer)) {
+			//printf("hid set report %x %x\n", setup.word1, setup.word2);
+			endpoint0_setupdata.bothwords = setup.bothwords;
+			endpoint0_buffer[0] = 0xE9;
+			endpoint0_receive(endpoint0_buffer, setup.wLength, 1);
+			return;
+		}
+		break;
 #endif
 	}
 	USB1_ENDPTCTRL0 = 0x000010001; // stall
 	endpoint0_transfer_ack.pointer0 = 0;
 	endpoint_queue_head[0].next = (uint32_t)&endpoint0_transfer_ack;
 	endpoint_queue_head[0].status = 0;
+	USB1_ENDPTCOMPLETE |= (1<<0) | (1<<16);
 	USB1_ENDPTPRIME |= (1<<0);
 	endpoint0_notify_mask = (notify ? (1 << 0) : 0);
 	while (USB1_ENDPTPRIME) ;
 	if (len > 0) {
 		// Executing A Transfer Descriptor, page 3182
 		endpoint0_transfer_data.next = 1;
-		endpoint0_transfer_data.status = (len << 16) | (1<<7) | (notify ? (1 << 15) : 0);
+		endpoint0_transfer_data.status = (len << 16) | (1<<7);
 		uint32_t addr = (uint32_t)data;
 		endpoint0_transfer_data.pointer0 = addr; // format: table 55-60, pg 3159
 		endpoint0_transfer_data.pointer1 = addr + 4096;
 		while (USB1_ENDPTPRIME) ;
 	}
 	endpoint0_transfer_ack.next = 1;
-	endpoint0_transfer_ack.status = (1<<7);
+	endpoint0_transfer_ack.status = (1<<7) | (notify ? (1 << 15) : 0);
 	endpoint0_transfer_ack.pointer0 = 0;
 	endpoint_queue_head[1].next = (uint32_t)&endpoint0_transfer_ack;
 	endpoint_queue_head[1].status = 0;
+	USB1_ENDPTCOMPLETE |= (1<<0) | (1<<16);
 	USB1_ENDPTPRIME |= (1<<16);
 	endpoint0_notify_mask = (notify ? (1 << 16) : 0);
 	while (USB1_ENDPTPRIME) ;
 	setup_t setup;
 
 	setup.bothwords = endpoint0_setupdata.bothwords;
-	//printf("complete\n");
+	//printf("complete %x %x %x\n", setup.word1, setup.word2, endpoint0_buffer[0]);
 #ifdef CDC_STATUS_INTERFACE
 	if (setup.wRequestAndType == 0x2021 /*CDC_SET_LINE_CODING*/) {
 		memcpy(usb_cdc_line_coding, endpoint0_buffer, 7);
 		}
 	}
 #endif
+#ifdef SEREMU_INTERFACE
+	if (setup.word1 == 0x03000921 && setup.word2 == ((4<<16)|SEREMU_INTERFACE)
+	  && endpoint0_buffer[0] == 0xA9 && endpoint0_buffer[1] == 0x45
+	  && endpoint0_buffer[2] == 0xC2 && endpoint0_buffer[3] == 0x6B) {
+		printf("seremu reboot request\n");
+		USB1_USBINTR |= USB_USBINTR_SRE;
+		usb_reboot_timer = 80; // TODO: 10 if only 12 Mbit/sec
+	}
+#endif
 }
 
 static void usb_endpoint_config(endpoint_t *qh, uint32_t config, void (*callback)(transfer_t *))

teensy4/usb_rawhid.c

+/* Teensyduino Core Library
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2017 PJRC.COM, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 2. If the Software is incorporated into a build system that allows
+ * selection among a list of target devices, then similar target
+ * devices manufactured by PJRC.COM must be included in the list of
+ * target devices and selectable in the same manner.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "usb_dev.h"
+#include "usb_rawhid.h"
+#include "core_pins.h" // for yield(), millis()
+#include <string.h>    // for memcpy()
+//#include "HardwareSerial.h"
+
+#ifdef RAWHID_INTERFACE // defined by usb_dev.h -> usb_desc.h
+
+int usb_rawhid_recv(void *buffer, uint32_t timeout)
+{
+	return -1;
+}
+
+int usb_rawhid_available(void)
+{
+	return 0;
+}
+
+int usb_rawhid_send(const void *buffer, uint32_t timeout)
+{
+	return -1;
+}
+
+#endif // RAWHID_INTERFACE

teensy4/usb_seremu.c

+/* Teensyduino Core Library
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2019 PJRC.COM, LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * 1. The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 2. If the Software is incorporated into a build system that allows
+ * selection among a list of target devices, then similar target
+ * devices manufactured by PJRC.COM must be included in the list of
+ * target devices and selectable in the same manner.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "usb_dev.h"
+#include "usb_seremu.h"
+#include "core_pins.h" // for yield()
+//#include "HardwareSerial.h"
+
+#ifdef SEREMU_INTERFACE // defined by usb_dev.h -> usb_desc.h
+
+volatile uint8_t usb_seremu_transmit_flush_timer=0;
+
+//static volatile uint8_t tx_noautoflush=0;
+
+#define TRANSMIT_FLUSH_TIMEOUT	5   /* in milliseconds */
+
+
+// get the next character, or -1 if nothing received
+int usb_seremu_getchar(void)
+{
+	return -1;
+}
+
+// peek at the next character, or -1 if nothing received
+int usb_seremu_peekchar(void)
+{
+	return -1;
+}
+
+// number of bytes available in the receive buffer
+int usb_seremu_available(void)
+{
+	return 0;
+}
+
+
+// discard any buffered input
+void usb_seremu_flush_input(void)
+{
+}
+
+
+
+// When the PC isn't listening, how long do we wait before discarding data?  If this is
+// too short, we risk losing data during the stalls that are common with ordinary desktop
+// software.  If it's too long, we stall the user's program when no software is running.
+#define TX_TIMEOUT_MSEC 30
+
+// When we've suffered the transmit timeout, don't wait again until the computer
+// begins accepting data.  If no software is running to receive, we'll just discard
+// data as rapidly as Serial.print() can generate it, until there's something to
+// actually receive it.
+static uint8_t transmit_previous_timeout=0;
+
+
+// transmit a character.  0 returned on success, -1 on error
+int usb_seremu_putchar(uint8_t c)
+{
+	return usb_seremu_write(&c, 1);
+}
+
+
+int usb_seremu_write(const void *buffer, uint32_t size)
+{
+	return 0;
+}
+
+int usb_seremu_write_buffer_free(void)
+{
+	return 1;
+}
+
+void usb_seremu_flush_output(void)
+{
+}
+
+void usb_seremu_flush_callback(void)
+{
+}
+
+#endif // SEREMU_INTERFACE