Add cdcacm usb serial example code
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07bae3f5f6
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@ -22,7 +22,7 @@ add_compile_definitions(
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DEBUG
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TARGETS=stm32/f1
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)
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add_executable(usbtest src/main.c src/util.c)
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add_executable(usbtest src/main.c src/util.c src/cdcacm.c)
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set_target_properties(usbtest PROPERTIES SUFFIX .elf)
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283
src/cdcacm.c
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283
src/cdcacm.c
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@ -0,0 +1,283 @@
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/*
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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/gpio.h>
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#include <libopencm3/usb/usbd.h>
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#include <libopencm3/usb/cdc.h>
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#include <SEGGER_RTT.h>
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#include "cdcacm.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 = 1,
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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 = 0,
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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 = data_iface,
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}, {
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.num_altsetting = 1,
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.altsetting = comm_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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"Black Sphere Technologies",
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"CDC-ACM Demo",
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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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static enum usbd_request_return_codes cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf,
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uint16_t *len, 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 USBD_REQ_HANDLED;
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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 USBD_REQ_NOTSUPP;
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return USBD_REQ_HANDLED;
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}
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return USBD_REQ_NOTSUPP;
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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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(void)usbd_dev;
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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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SEGGER_RTT_printf(0, "TX (%d): ", len);
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SEGGER_RTT_Write(0, buf, len);
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SEGGER_RTT_WriteString(0, "\n");
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usbd_ep_write_packet(usbd_dev, 0x82, buf, len);
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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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(void)usbd_dev;
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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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void start_cdcacm(void) {
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int i;
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usbd_device *usbd_dev;
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//SCB_VTOR = (uint32_t) 0x08005000;
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rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
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rcc_periph_clock_enable(RCC_GPIOB);
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/* Setup GPIOB Pin 9 to pull up the D+ high, so autodect works
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* with the bootloader. The circuit is active high. */
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_OPENDRAIN, GPIO9);
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gpio_set(GPIOB, GPIO9);
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/* Setup GPIOB Pin 1 for the LED */
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gpio_set(GPIOB, GPIO1);
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gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, GPIO1);
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SEGGER_RTT_printf(0, "Starting USB\n");
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rcc_periph_clock_enable(RCC_AFIO);
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rcc_periph_clock_enable(RCC_OTGFS);
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usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config,
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usb_strings, 3,
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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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for (i = 0; i < 0x800000; i++)
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__asm__("nop");
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gpio_clear(GPIOB, GPIO9);
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SEGGER_RTT_printf(0, "Main loop\n");
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while (1) {
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usbd_poll(usbd_dev);
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gpio_toggle(GPIOB, GPIO1);
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}
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}
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7
src/cdcacm.h
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7
src/cdcacm.h
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@ -0,0 +1,7 @@
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#ifndef USBTEST_CDCACM_H
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void start_cdcacm(void);
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#define USBTEST_CDCACM_H
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#endif //USBTEST_CDCACM_H
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@ -1,5 +1,8 @@
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#include <SEGGER_RTT.h>
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#include "cdcacm.h"
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void main(void) {
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int main(void) {
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SEGGER_RTT_printf(0, "Hello World\n");
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start_cdcacm();
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return 0;
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}
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