From 87db268c8e86aea672638b4129c3ff37f43c08c1 Mon Sep 17 00:00:00 2001 From: Federico Ruiz Ugalde Date: Sun, 30 Jun 2013 22:15:42 -0600 Subject: [PATCH] stm32f3: cdcacm example added and tested. --- .../f3/stm32f3-discovery/usb_cdcacm/Makefile | 25 ++ .../f3/stm32f3-discovery/usb_cdcacm/README | 7 + .../f3/stm32f3-discovery/usb_cdcacm/cdcacm.c | 265 ++++++++++++++++++ 3 files changed, 297 insertions(+) create mode 100644 examples/stm32/f3/stm32f3-discovery/usb_cdcacm/Makefile create mode 100644 examples/stm32/f3/stm32f3-discovery/usb_cdcacm/README create mode 100644 examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c diff --git a/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/Makefile b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/Makefile new file mode 100644 index 0000000..679822f --- /dev/null +++ b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/Makefile @@ -0,0 +1,25 @@ +## +## This file is part of the libopencm3 project. +## +## Copyright (C) 2009 Uwe Hermann +## +## 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 . +## + +BINARY = cdcacm + +LDSCRIPT = ../stm32f3-discovery.ld + +include ../../Makefile.include + diff --git a/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/README b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/README new file mode 100644 index 0000000..2f1ee4b --- /dev/null +++ b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/README @@ -0,0 +1,7 @@ +------------------------------------------------------------------------------ +README +------------------------------------------------------------------------------ + +This example implements a USB CDC-ACM device (aka Virtual Serial Port) +to demonstrate the use of the USB device stack. + diff --git a/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c new file mode 100644 index 0000000..4bec13e --- /dev/null +++ b/examples/stm32/f3/stm32f3-discovery/usb_cdcacm/cdcacm.c @@ -0,0 +1,265 @@ +/* + * This file is part of the libopencm3 project. + * + * Copyright (C) 2010 Gareth McMullin + * + * 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 . + */ + +#include +#include +#include +#include +#include + +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 its + * optional, but its absence causes a NULL pointer dereference in 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[] = { + "Black Sphere Technologies", + "CDC-ACM Demo", + "DEMO", +}; + +/* Buffer to be used for control requests. */ +uint8_t usbd_control_buffer[128]; + +static int cdcacm_control_request(usbd_device *usbd_dev, struct usb_setup_data *req, uint8_t **buf, + uint16_t *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. + */ + char local_buf[10]; + struct usb_cdc_notification *notif = (void *)local_buf; + + /* We echo signals back to host as notification. */ + notif->bmRequestType = 0xA1; + notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE; + notif->wValue = 0; + notif->wIndex = 0; + notif->wLength = 2; + local_buf[8] = req->wValue & 3; + local_buf[9] = 0; + // usbd_ep_write_packet(0x83, buf, 10); + 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, uint8_t ep) +{ + (void)ep; + (void)usbd_dev; + + char buf[64]; + int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64); + + if (len) { + usbd_ep_write_packet(usbd_dev, 0x82, buf, len); + buf[len] = 0; + } +} + +static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue) +{ + (void)wValue; + (void)usbd_dev; + + 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); +} + + +void usb_setup(void) { + /* Enable clocks for GPIO port A (for GPIO_USART2_TX) and USART2. */ + rcc_usb_prescale_1(); + rcc_peripheral_enable_clock(&RCC_APB1ENR, RCC_APB1ENR_USBEN); + rcc_peripheral_enable_clock(&RCC_AHBENR, RCC_AHBENR_IOPAEN); + + /* Setup GPIO pin GPIO_USART2_TX/GPIO9 on GPIO port A for transmit. */ + gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO11 | GPIO12); + gpio_set_af(GPIOA, GPIO_AF14, GPIO11| GPIO12); + +} + +int main(void) +{ + int i; + + usbd_device *usbd_dev; + + rcc_clock_setup_hsi(&hsi_8mhz[CLOCK_48MHZ]); + usb_setup(); + + usbd_dev = usbd_init(&stm32f103_usb_driver, &dev, &config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer)); + usbd_register_set_config_callback(usbd_dev, cdcacm_set_config); + + for (i = 0; i < 0x800000; i++) + __asm__("nop"); + + while (1) + usbd_poll(usbd_dev); +}