Initial Project Structure

src/CMakeLists.txt

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+set(target_name hirsute)
+add_executable(${target_name})
+
+target_sources(${target_name} PRIVATE
+    hirsute.c
+    ${PICO_TINYUSB_PATH}/src/portable/raspberrypi/pio_usb/dcd_pio_usb.c
+    ${PICO_TINYUSB_PATH}/src/portable/raspberrypi/pio_usb/hcd_pio_usb.c
+)
+
+target_link_options(${target_name} PRIVATE -Xlinker --print-memory-usage)
+target_compile_options(${target_name} PRIVATE -Wall -Wextra)
+
+target_compile_definitions(${target_name} PRIVATE PIO_USB_USE_TINYUSB)
+target_include_directories(${target_name} PRIVATE ${CMAKE_CURRENT_LIST_DIR})
+
+target_link_libraries(${target_name} PRIVATE pico_stdlib pico_pio_usb tinyusb_device tinyusb_host)
+pico_add_extra_outputs(${target_name})

src/hirsute.c

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+//    Copyright 2025 Elizabeth Cray
+
+//    Licensed under the Apache License, Version 2.0 (the "License");
+//    you may not use this file except in compliance with the License.
+//    You may obtain a copy of the License at
+
+//        http://www.apache.org/licenses/LICENSE-2.0
+
+//    Unless required by applicable law or agreed to in writing, software
+//    distributed under the License is distributed on an "AS IS" BASIS,
+//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//    See the License for the specific language governing permissions and
+//    limitations under the License.
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "hardware/clocks.h"
+#include "pico/stdlib.h"
+#include "pico/multicore.h"
+#include "pico/bootrom.h"
+
+#include "pio_usb.h"
+#include "tusb.h"
+
+void core_one() {
+  sleep_ms(10);
+  pio_usb_configuration_t pio_config = PIO_USB_DEFAULT_CONFIG;
+  tuh_configure(1, TUH_CFGID_RPI_PIO_USB_CONFIGURATION, &pio_config);
+  tuh_init(1);
+  while (true) {
+    tuh_task();
+  }
+}
+
+int main() {
+  set_sys_clock_khz(120000, true);
+  sleep_ms(10);
+  multicore_reset_core1();
+  
+  while (true) {
+    tud_task();
+    tud_cdc_write_flush();
+  }
+  
+  return 0;
+}

src/tusb_config.h

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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * 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:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 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.
+ *
+ */
+
+#ifndef _TUSB_CONFIG_H_
+#define _TUSB_CONFIG_H_
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------
+// COMMON CONFIGURATION
+//--------------------------------------------------------------------
+
+#define CFG_TUSB_OS               OPT_OS_PICO
+
+// Enable device stack
+#define CFG_TUD_ENABLED     1
+
+// Enable host stack with pio-usb if Pico-PIO-USB library is available
+#define CFG_TUH_ENABLED     1
+#define CFG_TUH_RPI_PIO_USB 1
+
+// CFG_TUSB_DEBUG is defined by compiler in DEBUG build
+// #define CFG_TUSB_DEBUG           0
+
+/* USB DMA on some MCUs can only access a specific SRAM region with restriction on alignment.
+ * Tinyusb use follows macros to declare transferring memory so that they can be put
+ * into those specific section.
+ * e.g
+ * - CFG_TUSB_MEM SECTION : __attribute__ (( section(".usb_ram") ))
+ * - CFG_TUSB_MEM_ALIGN   : __attribute__ ((aligned(4)))
+ */
+#ifndef CFG_TUSB_MEM_SECTION
+#define CFG_TUSB_MEM_SECTION
+#endif
+
+#ifndef CFG_TUSB_MEM_ALIGN
+#define CFG_TUSB_MEM_ALIGN          __attribute__ ((aligned(4)))
+#endif
+
+//--------------------------------------------------------------------
+// DEVICE CONFIGURATION
+//--------------------------------------------------------------------
+
+#ifndef CFG_TUD_ENDPOINT0_SIZE
+#define CFG_TUD_ENDPOINT0_SIZE    64
+#endif
+
+//------------- CLASS -------------//
+#define CFG_TUD_CDC              1
+
+// CDC FIFO size of TX and RX
+#define CFG_TUD_CDC_RX_BUFSIZE   256
+#define CFG_TUD_CDC_TX_BUFSIZE   256
+
+// CDC Endpoint transfer buffer size, more is faster
+#define CFG_TUD_CDC_EP_BUFSIZE   64
+
+//--------------------------------------------------------------------
+// HOST CONFIGURATION
+//--------------------------------------------------------------------
+
+// Size of buffer to hold descriptors and other data used for enumeration
+#define CFG_TUH_ENUMERATION_BUFSIZE 256
+
+#define CFG_TUH_HUB                 1
+// max device support (excluding hub device)
+#define CFG_TUH_DEVICE_MAX          (CFG_TUH_HUB ? 4 : 1) // hub typically has 4 ports
+
+#define CFG_TUH_HID                  4
+#define CFG_TUH_HID_EPIN_BUFSIZE    64
+#define CFG_TUH_HID_EPOUT_BUFSIZE   64
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif /* _TUSB_CONFIG_H_ */