tinyusb_minimal.c

#include <stdio.h>
#include "pico/stdlib.h"
#include "tusb.h"
#include "bsp/board.h"

const uint8_t device_desc[] = {
	18, // bLength
	1, // bDescriptorType
	0x10,
	0x01, // bcdUSB
	0x00, // bDeviceClass
	0x00, // bDeviceSubClass
	0x00, // bDeviceProtocol
	CFG_TUD_ENDPOINT0_SIZE, // bMaxPacketSize0
	0xfe,
	0xca, // idVendor
	0xcd,
	0xab, // idProduct,
	0x00,
	0x00, // bcdDevice
	0x00, // iManufacturer
	0x01, // iProduct
	0x00, // iSerialNumber
	0x01, // bNumConfigurations
};

const uint8_t conf_desc[] = {
	9, // bLength
	2, // bDescriptorType
	9 + 9,
	0, // wTotalLength
	1, // bNumInterface
	1, // bConfigurationValue
	0, // iConfiguration
	0x20, // bmAttributes
	0x0F, // bMaxPower

	// --- Interface ---
	9, // bLength
	4, // bDescriptorType
	1, // bInterfaceNumber
	0, // bAlternateSetting
	0, // bNumEndpoints
	0xFF, // bInterfaceClass
	0xFF, // bInterfaceSubClass
	0xFF, // bInterfaceProtocol
	0, // iInterface
};

const uint16_t string_desc_lang[] = { // Index: 0
	4 | (3 << 8), // bLength & bDescriptorType
	0
};
const uint16_t string_desc_product[] = { // Index: 1
	16 | (3 << 8),
	'R', 'a', 's', 'p', 'i', 'c', 'o'
};

uint8_t const *tud_descriptor_device_cb(void) {
	return device_desc;
}
uint8_t const *tud_descriptor_configuration_cb(uint8_t index) {
	return conf_desc;
}
uint16_t const *tud_descriptor_string_cb(uint8_t index, uint16_t langid) {
	uint16_t const *ret = NULL;
	switch(index) {
		case 0:
			ret = string_desc_lang;
			break;
		case 1:
			ret = string_desc_product;
			break;
		default:
			break;
	}
	return ret;
}

int main() {
	board_init();
	tusb_init();

	while(1) {
		tud_task();
	}
	return 0;
}