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path: root/examples/stm32/f1/other/usb_hid/usbhid.c
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/*
 * This file is part of the libopencm3 project.
 *
 * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdlib.h>
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
#include <libopencm3/cm3/systick.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/hid.h>

/* Define this to include the DFU APP interface. */
#define INCLUDE_DFU_INTERFACE

#ifdef INCLUDE_DFU_INTERFACE
#include <libopencm3/cm3/scb.h>
#include <libopencm3/usb/dfu.h>
#endif

static usbd_device *usbd_dev;

const struct usb_device_descriptor dev = {
	.bLength = USB_DT_DEVICE_SIZE,
	.bDescriptorType = USB_DT_DEVICE,
	.bcdUSB = 0x0200,
	.bDeviceClass = 0,
	.bDeviceSubClass = 0,
	.bDeviceProtocol = 0,
	.bMaxPacketSize0 = 64,
	.idVendor = 0x0483,
	.idProduct = 0x5710,
	.bcdDevice = 0x0200,
	.iManufacturer = 1,
	.iProduct = 2,
	.iSerialNumber = 3,
	.bNumConfigurations = 1,
};

/* I have no idea what this means. I haven't read the HID spec. */
static const u8 hid_report_descriptor[] = {
	0x05, 0x01, 0x09, 0x02, 0xA1, 0x01, 0x09, 0x01,
	0xA1, 0x00, 0x05, 0x09, 0x19, 0x01, 0x29, 0x03,
	0x15, 0x00, 0x25, 0x01, 0x95, 0x03, 0x75, 0x01,
	0x81, 0x02, 0x95, 0x01, 0x75, 0x05, 0x81, 0x01,
	0x05, 0x01, 0x09, 0x30, 0x09, 0x31, 0x09, 0x38,
	0x15, 0x81, 0x25, 0x7F, 0x75, 0x08, 0x95, 0x03,
	0x81, 0x06, 0xC0, 0x09, 0x3c, 0x05, 0xff, 0x09,
	0x01, 0x15, 0x00, 0x25, 0x01, 0x75, 0x01, 0x95,
	0x02, 0xb1, 0x22, 0x75, 0x06, 0x95, 0x01, 0xb1,
	0x01, 0xc0,
};

static const struct {
	struct usb_hid_descriptor hid_descriptor;
	struct {
		u8 bReportDescriptorType;
		u16 wDescriptorLength;
	} __attribute__((packed)) hid_report;
} __attribute__((packed)) hid_function = {
	.hid_descriptor = {
		.bLength = sizeof(hid_function),
		.bDescriptorType = USB_DT_HID,
		.bcdHID = 0x0100,
		.bCountryCode = 0,
		.bNumDescriptors = 1,
	},
	.hid_report = {
		.bReportDescriptorType = USB_DT_REPORT,
		.wDescriptorLength = sizeof(hid_report_descriptor),
	}
};

const struct usb_endpoint_descriptor hid_endpoint = {
	.bLength = USB_DT_ENDPOINT_SIZE,
	.bDescriptorType = USB_DT_ENDPOINT,
	.bEndpointAddress = 0x81,
	.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
	.wMaxPacketSize = 4,
	.bInterval = 0x20,
};

const struct usb_interface_descriptor hid_iface = {
	.bLength = USB_DT_INTERFACE_SIZE,
	.bDescriptorType = USB_DT_INTERFACE,
	.bInterfaceNumber = 0,
	.bAlternateSetting = 0,
	.bNumEndpoints = 1,
	.bInterfaceClass = USB_CLASS_HID,
	.bInterfaceSubClass = 1, /* boot */
	.bInterfaceProtocol = 2, /* mouse */
	.iInterface = 0,

	.endpoint = &hid_endpoint,

	.extra = &hid_function,
	.extralen = sizeof(hid_function),
};

#ifdef INCLUDE_DFU_INTERFACE
const struct usb_dfu_descriptor dfu_function = {
	.bLength = sizeof(struct usb_dfu_descriptor),
	.bDescriptorType = DFU_FUNCTIONAL,
	.bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
	.wDetachTimeout = 255,
	.wTransferSize = 1024,
	.bcdDFUVersion = 0x011A,
};

const struct usb_interface_descriptor dfu_iface = {
	.bLength = USB_DT_INTERFACE_SIZE,
	.bDescriptorType = USB_DT_INTERFACE,
	.bInterfaceNumber = 1,
	.bAlternateSetting = 0,
	.bNumEndpoints = 0,
	.bInterfaceClass = 0xFE,
	.bInterfaceSubClass = 1,
	.bInterfaceProtocol = 1,
	.iInterface = 0,

	.extra = &dfu_function,
	.extralen = sizeof(dfu_function),
};
#endif

const struct usb_interface ifaces[] = {{
	.num_altsetting = 1,
	.altsetting = &hid_iface,
#ifdef INCLUDE_DFU_INTERFACE
}, {
	.num_altsetting = 1,
	.altsetting = &dfu_iface,
#endif
}};

const struct usb_config_descriptor config = {
	.bLength = USB_DT_CONFIGURATION_SIZE,
	.bDescriptorType = USB_DT_CONFIGURATION,
	.wTotalLength = 0,
#ifdef INCLUDE_DFU_INTERFACE
	.bNumInterfaces = 2,
#else
	.bNumInterfaces = 1,
#endif
	.bConfigurationValue = 1,
	.iConfiguration = 0,
	.bmAttributes = 0xC0,
	.bMaxPower = 0x32,

	.interface = ifaces,
};

static const char *usb_strings[] = {
	"Black Sphere Technologies",
	"HID Demo",
	"DEMO",
};

static int hid_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, u8 **buf, u16 *len,
			void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req))
{
	(void)complete;
	(void)usbd_dev;

	if((req->bmRequestType != 0x81) ||
	   (req->bRequest != USB_REQ_GET_DESCRIPTOR) ||
	   (req->wValue != 0x2200))
		return 0;

	/* Handle the HID report descriptor. */
	*buf = (u8 *)hid_report_descriptor;
	*len = sizeof(hid_report_descriptor);

	return 1;
}

#ifdef INCLUDE_DFU_INTERFACE
static void dfu_detach_complete(usbd_device *usbd_dev, struct usb_setup_data *req)
{
	(void)req;
	(void)usbd_dev;

	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO10);
	gpio_set(GPIOA, GPIO10);
	scb_reset_core();
}

static int dfu_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, u8 **buf, u16 *len,
			void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req))
{
	(void)buf;
	(void)len;
	(void)usbd_dev;

	if ((req->bmRequestType != 0x21) || (req->bRequest != DFU_DETACH))
		return 0; /* Only accept class request. */

	*complete = dfu_detach_complete;

	return 1;
}
#endif

static void hid_set_config(usbd_device *usbd_dev, u16 wValue)
{
	(void)wValue;
	(void)usbd_dev;

	usbd_ep_setup(usbd_dev, 0x81, USB_ENDPOINT_ATTR_INTERRUPT, 4, NULL);

	usbd_register_control_callback(
				usbd_dev,
				USB_REQ_TYPE_STANDARD | USB_REQ_TYPE_INTERFACE,
				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
				hid_control_request);
#ifdef INCLUDE_DFU_INTERFACE
	usbd_register_control_callback(
				usbd_dev,
				USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
				USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
				dfu_control_request);
#endif

	systick_set_clocksource(STK_CTRL_CLKSOURCE_AHB_DIV8);
	systick_set_reload(100000);
	systick_interrupt_enable();
	systick_counter_enable();
}

int main(void)
{
	rcc_clock_setup_in_hsi_out_48mhz();

	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN);
	rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_AFIOEN);

	AFIO_MAPR |= AFIO_MAPR_SWJ_CFG_JTAG_OFF_SW_ON;
	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, 0, GPIO15);

	usbd_dev = usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings, 3);
	usbd_register_set_config_callback(usbd_dev, hid_set_config);

	gpio_set(GPIOA, GPIO15);
	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_2_MHZ,
		      GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);

	while (1)
		usbd_poll(usbd_dev);
}

void sys_tick_handler(void)
{
	static int x = 0;
	static int dir = 1;
	u8 buf[4] = {0, 0, 0, 0};

	buf[1] = dir;
	x += dir;
	if (x > 30)
		dir = -dir;
	if (x < -30)
		dir = -dir;

	usbd_ep_write_packet(usbd_dev, 0x81, buf, 4);
}