242 lines
6.4 KiB
C
242 lines
6.4 KiB
C
/*
|
|
* 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/f4/rcc.h>
|
|
#include <libopencm3/stm32/f4/gpio.h>
|
|
#include <libopencm3/usb/usbd.h>
|
|
#include <libopencm3/usb/cdc.h>
|
|
#include <libopencm3/stm32/f4/scb.h>
|
|
|
|
static const struct usb_device_descriptor dev = {
|
|
.bLength = USB_DT_DEVICE_SIZE,
|
|
.bDescriptorType = USB_DT_DEVICE,
|
|
.bcdUSB = 0x0200,
|
|
.bDeviceClass = USB_CLASS_CDC,
|
|
.bDeviceSubClass = 0,
|
|
.bDeviceProtocol = 0,
|
|
.bMaxPacketSize0 = 64,
|
|
.idVendor = 0x0483,
|
|
.idProduct = 0x5740,
|
|
.bcdDevice = 0x0200,
|
|
.iManufacturer = 1,
|
|
.iProduct = 2,
|
|
.iSerialNumber = 3,
|
|
.bNumConfigurations = 1,
|
|
};
|
|
|
|
/*
|
|
* This notification endpoint isn't implemented. According to CDC spec it's
|
|
* optional, but its absence causes a NULL pointer dereference in the
|
|
* Linux cdc_acm driver.
|
|
*/
|
|
static const struct usb_endpoint_descriptor comm_endp[] = {{
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = 0x83,
|
|
.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
|
|
.wMaxPacketSize = 16,
|
|
.bInterval = 255,
|
|
}};
|
|
|
|
static const struct usb_endpoint_descriptor data_endp[] = {{
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = 0x01,
|
|
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
|
|
.wMaxPacketSize = 64,
|
|
.bInterval = 1,
|
|
}, {
|
|
.bLength = USB_DT_ENDPOINT_SIZE,
|
|
.bDescriptorType = USB_DT_ENDPOINT,
|
|
.bEndpointAddress = 0x82,
|
|
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
|
|
.wMaxPacketSize = 64,
|
|
.bInterval = 1,
|
|
}};
|
|
|
|
static const struct {
|
|
struct usb_cdc_header_descriptor header;
|
|
struct usb_cdc_call_management_descriptor call_mgmt;
|
|
struct usb_cdc_acm_descriptor acm;
|
|
struct usb_cdc_union_descriptor cdc_union;
|
|
} __attribute__((packed)) cdcacm_functional_descriptors = {
|
|
.header = {
|
|
.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
|
|
.bDescriptorType = CS_INTERFACE,
|
|
.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
|
|
.bcdCDC = 0x0110,
|
|
},
|
|
.call_mgmt = {
|
|
.bFunctionLength =
|
|
sizeof(struct usb_cdc_call_management_descriptor),
|
|
.bDescriptorType = CS_INTERFACE,
|
|
.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
|
|
.bmCapabilities = 0,
|
|
.bDataInterface = 1,
|
|
},
|
|
.acm = {
|
|
.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
|
|
.bDescriptorType = CS_INTERFACE,
|
|
.bDescriptorSubtype = USB_CDC_TYPE_ACM,
|
|
.bmCapabilities = 0,
|
|
},
|
|
.cdc_union = {
|
|
.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
|
|
.bDescriptorType = CS_INTERFACE,
|
|
.bDescriptorSubtype = USB_CDC_TYPE_UNION,
|
|
.bControlInterface = 0,
|
|
.bSubordinateInterface0 = 1,
|
|
}
|
|
};
|
|
|
|
static const struct usb_interface_descriptor comm_iface[] = {{
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bInterfaceNumber = 0,
|
|
.bAlternateSetting = 0,
|
|
.bNumEndpoints = 1,
|
|
.bInterfaceClass = USB_CLASS_CDC,
|
|
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
|
|
.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
|
|
.iInterface = 0,
|
|
|
|
.endpoint = comm_endp,
|
|
|
|
.extra = &cdcacm_functional_descriptors,
|
|
.extralen = sizeof(cdcacm_functional_descriptors)
|
|
}};
|
|
|
|
static const struct usb_interface_descriptor data_iface[] = {{
|
|
.bLength = USB_DT_INTERFACE_SIZE,
|
|
.bDescriptorType = USB_DT_INTERFACE,
|
|
.bInterfaceNumber = 1,
|
|
.bAlternateSetting = 0,
|
|
.bNumEndpoints = 2,
|
|
.bInterfaceClass = USB_CLASS_DATA,
|
|
.bInterfaceSubClass = 0,
|
|
.bInterfaceProtocol = 0,
|
|
.iInterface = 0,
|
|
|
|
.endpoint = data_endp,
|
|
}};
|
|
|
|
static const struct usb_interface ifaces[] = {{
|
|
.num_altsetting = 1,
|
|
.altsetting = comm_iface,
|
|
}, {
|
|
.num_altsetting = 1,
|
|
.altsetting = data_iface,
|
|
}};
|
|
|
|
static const struct usb_config_descriptor config = {
|
|
.bLength = USB_DT_CONFIGURATION_SIZE,
|
|
.bDescriptorType = USB_DT_CONFIGURATION,
|
|
.wTotalLength = 0,
|
|
.bNumInterfaces = 2,
|
|
.bConfigurationValue = 1,
|
|
.iConfiguration = 0,
|
|
.bmAttributes = 0x80,
|
|
.bMaxPower = 0x32,
|
|
|
|
.interface = ifaces,
|
|
};
|
|
|
|
static const char *usb_strings[] = {
|
|
"x",
|
|
"Black Sphere Technologies",
|
|
"CDC-ACM Demo",
|
|
"DEMO",
|
|
};
|
|
|
|
static int cdcacm_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)buf;
|
|
(void)usbd_dev;
|
|
|
|
switch (req->bRequest) {
|
|
case USB_CDC_REQ_SET_CONTROL_LINE_STATE: {
|
|
/*
|
|
* This Linux cdc_acm driver requires this to be implemented
|
|
* even though it's optional in the CDC spec, and we don't
|
|
* advertise it in the ACM functional descriptor.
|
|
*/
|
|
return 1;
|
|
}
|
|
case USB_CDC_REQ_SET_LINE_CODING:
|
|
if (*len < sizeof(struct usb_cdc_line_coding))
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void cdcacm_data_rx_cb(usbd_device *usbd_dev, u8 ep)
|
|
{
|
|
(void)ep;
|
|
|
|
char buf[64];
|
|
int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64);
|
|
|
|
if (len) {
|
|
while (usbd_ep_write_packet(usbd_dev, 0x82, buf, len) == 0)
|
|
;
|
|
}
|
|
|
|
gpio_toggle(GPIOC, GPIO5);
|
|
}
|
|
|
|
static void cdcacm_set_config(usbd_device *usbd_dev, u16 wValue)
|
|
{
|
|
(void)wValue;
|
|
|
|
usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb);
|
|
usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
|
|
usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
|
|
|
|
usbd_register_control_callback(
|
|
usbd_dev,
|
|
USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
|
|
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
|
|
cdcacm_control_request);
|
|
}
|
|
|
|
int main(void)
|
|
{
|
|
usbd_device *usbd_dev;
|
|
|
|
rcc_clock_setup_hse_3v3(&hse_8mhz_3v3[CLOCK_3V3_120MHZ]);
|
|
|
|
rcc_peripheral_enable_clock(&RCC_AHB1ENR, RCC_AHB1ENR_IOPAEN);
|
|
rcc_peripheral_enable_clock(&RCC_AHB2ENR, RCC_AHB2ENR_OTGFSEN);
|
|
|
|
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,
|
|
GPIO9 | GPIO11 | GPIO12);
|
|
gpio_set_af(GPIOA, GPIO_AF10, GPIO9 | GPIO11 | GPIO12);
|
|
|
|
usbd_dev = usbd_init(&otgfs_usb_driver, &dev, &config, usb_strings);
|
|
usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
|
|
|
|
while (1)
|
|
usbd_poll(usbd_dev);
|
|
}
|