337 lines
9.3 KiB
C
337 lines
9.3 KiB
C
/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <libopencm3/stm32/rcc.h>
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#include <libopencm3/stm32/flash.h>
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#include <libopencm3/stm32/gpio.h>
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#include <libopencm3/stm32/syscfg.h>
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#include <libopencm3/stm32/crs.h>
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#include <libopencm3/usb/usbd.h>
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#include <libopencm3/usb/cdc.h>
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static const struct usb_device_descriptor dev = {
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.bLength = USB_DT_DEVICE_SIZE,
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.bDescriptorType = USB_DT_DEVICE,
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.bcdUSB = 0x0200,
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.bDeviceClass = USB_CLASS_CDC,
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.bDeviceSubClass = 0,
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.bDeviceProtocol = 0,
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.bMaxPacketSize0 = 64,
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.idVendor = 0x0483,
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.idProduct = 0x5740,
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.bcdDevice = 0x0200,
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.iManufacturer = 1,
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.iProduct = 2,
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.iSerialNumber = 3,
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.bNumConfigurations = 1,
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};
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/*
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* This notification endpoint isn't implemented. According to CDC spec its
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* optional, but its absence causes a NULL pointer dereference in Linux
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* cdc_acm driver.
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*/
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static const struct usb_endpoint_descriptor comm_endp[] = {{
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x83,
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.bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
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.wMaxPacketSize = 16,
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.bInterval = 255,
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}};
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static const struct usb_endpoint_descriptor data_endp[] = {{
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x01,
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.bmAttributes = USB_ENDPOINT_ATTR_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 1,
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}, {
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.bLength = USB_DT_ENDPOINT_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = 0x82,
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.bmAttributes = USB_ENDPOINT_ATTR_BULK,
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.wMaxPacketSize = 64,
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.bInterval = 1,
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}};
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static const struct {
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struct usb_cdc_header_descriptor header;
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struct usb_cdc_call_management_descriptor call_mgmt;
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struct usb_cdc_acm_descriptor acm;
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struct usb_cdc_union_descriptor cdc_union;
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} __attribute__((packed)) cdcacm_functional_descriptors = {
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.header = {
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.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
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.bcdCDC = 0x0110,
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},
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.call_mgmt = {
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.bFunctionLength =
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sizeof(struct usb_cdc_call_management_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
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.bmCapabilities = 0,
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.bDataInterface = 1,
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},
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.acm = {
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.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_ACM,
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.bmCapabilities = 0,
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},
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.cdc_union = {
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.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
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.bDescriptorType = CS_INTERFACE,
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.bDescriptorSubtype = USB_CDC_TYPE_UNION,
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.bControlInterface = 0,
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.bSubordinateInterface0 = 1,
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}
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};
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static const struct usb_interface_descriptor comm_iface[] = {{
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 0,
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.bAlternateSetting = 0,
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.bNumEndpoints = 1,
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.bInterfaceClass = USB_CLASS_CDC,
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.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
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.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
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.iInterface = 0,
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.endpoint = comm_endp,
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.extra = &cdcacm_functional_descriptors,
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.extralen = sizeof(cdcacm_functional_descriptors)
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}};
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static const struct usb_interface_descriptor data_iface[] = {{
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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.bInterfaceNumber = 1,
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.bAlternateSetting = 0,
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_DATA,
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.bInterfaceSubClass = 0,
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.bInterfaceProtocol = 0,
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.iInterface = 0,
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.endpoint = data_endp,
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}};
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static const struct usb_interface ifaces[] = {{
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.num_altsetting = 1,
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.altsetting = comm_iface,
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}, {
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.num_altsetting = 1,
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.altsetting = data_iface,
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}};
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static const struct usb_config_descriptor config = {
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.bLength = USB_DT_CONFIGURATION_SIZE,
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.bDescriptorType = USB_DT_CONFIGURATION,
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.wTotalLength = 0,
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.bNumInterfaces = 2,
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.bConfigurationValue = 1,
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.iConfiguration = 0,
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.bmAttributes = 0x80,
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.bMaxPower = 0x32,
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.interface = ifaces,
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};
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static const char *usb_strings[] = {
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"flabbergast",
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"CDC-ACM Test",
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"DeMo",
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};
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/* Buffer to be used for control requests. */
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uint8_t usbd_control_buffer[128];
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/* Aux functions */
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static void led_flip(void) {
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if(GPIOA_IDR & (1<<15)) {
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GPIOA_BRR = GPIO15;
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} else {
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GPIOA_BSRR = GPIO15;
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}
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}
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static int cdcacm_control_request(usbd_device *usbd_dev,
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struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
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void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req))
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{
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(void)complete;
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(void)buf;
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(void)usbd_dev;
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switch(req->bRequest) {
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case USB_CDC_REQ_SET_CONTROL_LINE_STATE: {
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/*
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* This Linux cdc_acm driver requires this to be implemented
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* even though it's optional in the CDC spec, and we don't
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* advertise it in the ACM functional descriptor.
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*/
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char local_buf[10];
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struct usb_cdc_notification *notif = (void *)local_buf;
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/* We echo signals back to host as notification. */
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notif->bmRequestType = 0xA1;
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notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
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notif->wValue = 0;
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notif->wIndex = 0;
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notif->wLength = 2;
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local_buf[8] = req->wValue & 3;
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local_buf[9] = 0;
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// usbd_ep_write_packet(0x83, buf, 10);
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return 1;
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}
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case USB_CDC_REQ_SET_LINE_CODING:
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if(*len < sizeof(struct usb_cdc_line_coding))
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return 0;
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return 1;
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}
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return 0;
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}
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static void cdcacm_data_rx_cb(usbd_device *usbd_dev, uint8_t ep)
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{
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(void)ep;
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char buf[64];
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int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64);
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if (len) {
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usbd_ep_write_packet(usbd_dev, 0x82, buf, len);
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buf[len] = 0;
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led_flip();
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}
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}
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static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue)
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{
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(void)wValue;
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usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb);
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usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
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usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
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usbd_register_control_callback(
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usbd_dev,
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USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
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USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
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cdcacm_control_request);
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}
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int main(void)
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{
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usbd_device *usbd_dev;
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#if defined(BOOTLOADER8K)
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# define SCB_VTOR MMIO32(0xE000ED08)
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SCB_VTOR = (uint32_t) 0x08002000;
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#endif
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#if defined(STM32F0)
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rcc_clock_setup_in_hsi_out_48mhz();
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crs_autotrim_usb_enable();
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rcc_set_usbclk_source(RCC_HSI48);
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// this is needed for F042 in TSSOP-20 package; USB is on shared pins
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//rcc_periph_clock_enable(RCC_SYSCFG_COMP);
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//SYSCFG_CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
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#elif defined(STM32L0)
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// libopencm3 clock setup can be a bit ad-hoc, so let's configure manually
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// 32MHz, PLL supplied by the internal HSI16 oscillator
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/* Set the flash latency */
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FLASH_ACR |= FLASH_ACR_LATENCY_1WS;
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/* Turn on HSI16 */
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RCC_CR |= RCC_CR_HSI16ON;
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while ((RCC_CR & RCC_CR_HSI16RDY) == 0);
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/* Make sure PLL is off (it should be after reset, but ...) */
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RCC_CR &= ~RCC_CR_PLLON;
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while (RCC_CR & RCC_CR_PLLRDY);
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/* Set the PLL source to HSI16 */
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RCC_CFGR &= ~(1<<16); // RCC_CFGR_PLLSRC
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/* Set up the PLL */
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uint32_t reg = RCC_CFGR
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& ~( (RCC_CFGR_PLLMUL_MASK << RCC_CFGR_PLLMUL_SHIFT)
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| (RCC_CFGR_PLLDIV_MASK << RCC_CFGR_PLLDIV_SHIFT));
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RCC_CFGR = reg | (RCC_CFGR_PLLMUL_MUL4 << RCC_CFGR_PLLMUL_SHIFT)
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| (RCC_CFGR_PLLDIV_DIV2 << RCC_CFGR_PLLDIV_SHIFT);
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/* Turn on PLL and switch to it */
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RCC_CR |= RCC_CR_PLLON;
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while ((RCC_CR & RCC_CR_PLLRDY) == 0);
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RCC_CFGR |= RCC_CFGR_SW_PLL;
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/* Set the peripheral clock frequencies used. */
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rcc_ahb_frequency = 32000000;
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rcc_apb1_frequency = 32000000;
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rcc_apb2_frequency = 32000000;
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// end of manual clock configuration
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// Enable VREFINT reference for HSI48
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rcc_periph_clock_enable(RCC_SYSCFG);
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SYSCFG_CFGR3 |= SYSCFG_CFGR3_ENREF_HSI48;
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rcc_set_hsi48_source_rc48();
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crs_autotrim_usb_enable();
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rcc_osc_on(RCC_HSI48);
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rcc_wait_for_osc_ready(RCC_HSI48);
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/* MCO on PA9, to verify MCU speed with a scope */
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gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
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gpio_set_af(GPIOA, GPIO_AF0, GPIO9);
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RCC_CFGR |= (RCC_CFGR_MCO_SYSCLK << RCC_CFGR_MCO_SHIFT) | (RCC_CFGR_MCOPRE_DIV16 << 28);
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#else
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#error "Edit the sources and do the clock setup!"
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#endif
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rcc_periph_clock_enable(RCC_GPIOA);
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gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO15); // LED
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gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO1); // button, has external pull-down
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usbd_dev = usbd_init(&st_usbfs_v2_usb_driver, &dev, &config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer));
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usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
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char greeting[16] = "hello, world\r\n";
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while (1) {
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usbd_poll(usbd_dev);
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if (gpio_get(GPIOA, GPIO1)) {
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usbd_ep_write_packet(usbd_dev, 0x82, greeting, 15);
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for (uint32_t i = 0; i < 2000000; i++) { /* Wait a bit, cheap "debounce" */
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__asm__("nop");
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}
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}
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}
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}
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// vim: tabstop=4:shiftwidth=4:noexpandtab
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