Slightly improve and generify the USB infrastructure.

The good news is that <libmaple/usb.h> and <libmaple/usb_cdcacm.h> did
turn out generic enough in what they specify to go on unchanged.

However, we can't just go on assuming that there's USB just because
we're on an F1. Now that there's value line in the tree, we need to be
more careful (value line F1s don't have USB peripherals). To that end,
make all the F1 board-includes/*.mk files specify what line their MCU
is with an MCU_F1_LINE variable. Use that to hack
libmaple/usb/rules.mk so we only try to build the USB module under
appropriate circumstances.

While we're at it, add a vector_symbols.inc for value line MCUs under
support/ld/. We need this to get the target-config.mk modifications
implied by the addition of MCU_F1_LINE. We'll fix up some other
performance-line-isms under libmaple/stm32f1 in a separate commit.

Also in libmaple/usb/:

- Move everything into a new stm32f1 directory. Due to aforementioned
  rules.mk hacks, there is no immediate need for an stm32f2
  directory (USB support doesn't exist there).

- Update the README for style and content.

Signed-off-by: Marti Bolivar <mbolivar@leaflabs.com>

1 files changed, 148 insertions, 0 deletions

diff --git a/libmaple/usb/stm32f1/usb_descriptors.h b/libmaple/usb/stm32f1/usb_descriptors.h
new file mode 100644
index 0000000..9bcb2b6
--- /dev/null
+++ b/libmaple/usb/stm32f1/usb_descriptors.h
@@ -0,0 +1,148 @@
+/******************************************************************************
+ * The MIT License
+ *
+ * Copyright (c) 2010 LeafLabs LLC.
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *****************************************************************************/
+
+#ifndef _USB_DESCRIPTORS_H_
+#define _USB_DESCRIPTORS_H_
+
+#include <libmaple/libmaple.h>
+
+#define USB_DESCRIPTOR_TYPE_DEVICE        0x01
+#define USB_DESCRIPTOR_TYPE_CONFIGURATION 0x02
+#define USB_DESCRIPTOR_TYPE_STRING        0x03
+#define USB_DESCRIPTOR_TYPE_INTERFACE     0x04
+#define USB_DESCRIPTOR_TYPE_ENDPOINT      0x05
+
+#define USB_DEVICE_CLASS_CDC              0x02
+#define USB_DEVICE_SUBCLASS_CDC           0x00
+#define USB_INTERFACE_CLASS_CDC           0x02
+/* CDC Abstract Control Model */
+#define USB_INTERFACE_SUBCLASS_CDC_ACM    0x02
+#define USB_INTERFACE_CLASS_DIC           0x0A
+
+#define USB_CONFIG_ATTR_BUSPOWERED        0b10000000
+#define USB_CONFIG_ATTR_SELF_POWERED      0b11000000
+
+#define EP_TYPE_INTERRUPT                 0x03
+#define EP_TYPE_BULK                      0x02
+
+#define USB_DESCRIPTOR_ENDPOINT_IN        0x80
+#define USB_DESCRIPTOR_ENDPOINT_OUT       0x00
+
+#define USB_DESCRIPTOR_STRING_LEN(x) (2 + (x << 1))
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+#define USB_DESCRIPTOR_STRING(len)              \
+  struct {                                      \
+      uint8 bLength;                            \
+      uint8 bDescriptorType;                    \
+      uint16 bString[len];                      \
+  } __packed
+
+#define CDC_FUNCTIONAL_DESCRIPTOR_SIZE(DataSize) (3 + DataSize)
+#define CDC_FUNCTIONAL_DESCRIPTOR(DataSize)     \
+  struct {                                      \
+      uint8 bLength;                            \
+      uint8 bDescriptorType;                    \
+      uint8 SubType;                            \
+      uint8 Data[DataSize];                     \
+  } __packed
+
+typedef struct {
+    uint8  bLength;
+    uint8  bDescriptorType;
+    uint16 bcdUSB;
+    uint8  bDeviceClass;
+    uint8  bDeviceSubClass;
+    uint8  bDeviceProtocol;
+    uint8  bMaxPacketSize0;
+    uint16 idVendor;
+    uint16 idProduct;
+    uint16 bcdDevice;
+    uint8  iManufacturer;
+    uint8  iProduct;
+    uint8  iSerialNumber;
+    uint8  bNumConfigurations;
+} __packed USB_Descriptor_Device;
+
+typedef struct {
+    uint8  bLength;
+    uint8  bDescriptorType;
+    uint16 wTotalLength;
+    uint8  bNumInterfaces;
+    uint8  bConfigurationValue;
+    uint8  iConfiguration;
+    uint8  bmAttributes;
+    uint8  bMaxPower;
+} __packed USB_Descriptor_Config_Header;
+
+typedef struct {
+    uint8 bLength;
+    uint8 bDescriptorType;
+    uint8 bInterfaceNumber;
+    uint8 bAlternateSetting;
+    uint8 bNumEndpoints;
+    uint8 bInterfaceClass;
+    uint8 bInterfaceSubClass;
+    uint8 bInterfaceProtocol;
+    uint8 iInterface;
+} __packed USB_Descriptor_Interface;
+
+typedef struct {
+    uint8  bLength;
+    uint8  bDescriptorType;
+    uint8  bEndpointAddress;
+    uint8  bmAttributes;
+    uint16 wMaxPacketSize;
+    uint8  bInterval;
+} __packed USB_Descriptor_Endpoint;
+
+typedef struct {
+    USB_Descriptor_Config_Header Config_Header;
+    USB_Descriptor_Interface     CCI_Interface;
+    CDC_FUNCTIONAL_DESCRIPTOR(2) CDC_Functional_IntHeader;
+    CDC_FUNCTIONAL_DESCRIPTOR(2) CDC_Functional_CallManagement;
+    CDC_FUNCTIONAL_DESCRIPTOR(1) CDC_Functional_ACM;
+    CDC_FUNCTIONAL_DESCRIPTOR(2) CDC_Functional_Union;
+    USB_Descriptor_Endpoint      ManagementEndpoint;
+    USB_Descriptor_Interface     DCI_Interface;
+    USB_Descriptor_Endpoint      DataOutEndpoint;
+    USB_Descriptor_Endpoint      DataInEndpoint;
+} __packed USB_Descriptor_Config;
+
+typedef struct {
+    uint8  bLength;
+    uint8  bDescriptorType;
+    uint16 bString[];
+} USB_Descriptor_String;
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif