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authorGareth McMullin2011-12-17 14:11:39 +1300
committerGareth McMullin2011-12-17 14:11:39 +1300
commit651917aeb4b76afbb6c4a859e9a7aab4978b5008 (patch)
tree913f0c43ab18c4056eedcabd08822ff6f0b199c6 /examples/stm32/f4
parentd630d8397236b50ef68653b71348f39c1c48ce0b (diff)
Added USB example for stm32f4.
Moved clock enable for OTG_FS back into applications. This and gpio config are the only differences between f107 and f2xx/f4xx.
Diffstat (limited to 'examples/stm32/f4')
-rw-r--r--examples/stm32/f4/stm32f4-discovery/usb_cdcacm/Makefile25
-rw-r--r--examples/stm32/f4/stm32f4-discovery/usb_cdcacm/README7
-rw-r--r--examples/stm32/f4/stm32f4-discovery/usb_cdcacm/cdcacm.c237
3 files changed, 269 insertions, 0 deletions
diff --git a/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/Makefile b/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/Makefile
new file mode 100644
index 0000000..3213005
--- /dev/null
+++ b/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/Makefile
@@ -0,0 +1,25 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program 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 General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program. If not, see <http://www.gnu.org/licenses/>.
+##
+
+BINARY = cdcacm
+
+LDSCRIPT = ../stm32f4-discovery.ld
+
+include ../../Makefile.include
+
diff --git a/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/README b/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/README
new file mode 100644
index 0000000..2f1ee4b
--- /dev/null
+++ b/examples/stm32/f4/stm32f4-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/f4/stm32f4-discovery/usb_cdcacm/cdcacm.c b/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/cdcacm.c
new file mode 100644
index 0000000..ea4303d
--- /dev/null
+++ b/examples/stm32/f4/stm32f4-discovery/usb_cdcacm/cdcacm.c
@@ -0,0 +1,237 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. 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>
+
+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(struct usb_setup_data *req, u8 **buf,
+ u16 *len, void (**complete)(struct usb_setup_data *req))
+{
+ (void)complete;
+ (void)buf;
+
+ 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(u8 ep)
+{
+ (void)ep;
+
+ char buf[64];
+ int len = usbd_ep_read_packet(0x01, buf, 64);
+
+ if (len) {
+ while (usbd_ep_write_packet(0x82, buf, len) == 0)
+ ;
+ }
+
+ gpio_toggle(GPIOC, GPIO5);
+}
+
+static void cdcacm_set_config(u16 wValue)
+{
+ (void)wValue;
+
+ usbd_ep_setup(0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_data_rx_cb);
+ usbd_ep_setup(0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
+ usbd_ep_setup(0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
+
+ usbd_register_control_callback(
+ USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
+ USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
+ cdcacm_control_request);
+}
+
+int main(void)
+{
+ 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_init(&otgfs_usb_driver, &dev, &config, usb_strings);
+ usbd_register_set_config_callback(cdcacm_set_config);
+
+ while (1)
+ usbd_poll();
+}
+