Make USB its own submodule.

Add libmaple/usb/rules.mk, which compiles the USB FS device firmware
submodule. Move the logic for compiling the USB stack from
libmaple/rules.mk into libmaple/usb/rules.mk.

Move libmaple/usb/usb_cdacm.h to libmaple/include/libmaple/. Its API
is sufficiently general that we'll be able to port it over to USB
OTG (either FS or HS) eventually, and that lets us include it from
Wirish using the new style for libmaple headers.

Fix the includes for public libmaple headers within libmaple/usb.

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

8 files changed, 54 insertions, 25 deletions

diff --git a/libmaple/usb/usb_cdcacm.h b/libmaple/include/libmaple/usb_cdcacm.h
index ec672a3..2dbcbea 100644
--- a/libmaple/usb/usb_cdcacm.h
+++ b/libmaple/include/libmaple/usb_cdcacm.h
@@ -29,8 +29,8 @@
  * @brief USB CDC ACM (virtual serial terminal) support
  */
 
-#ifndef _USB_CDCACM_H_
-#define _USB_CDCACM_H_
+#ifndef _LIBMAPLE_USB_CDCACM_H_
+#define _LIBMAPLE_USB_CDCACM_H_
 
 #include <libmaple/libmaple_types.h>
 #include <libmaple/gpio.h>
diff --git a/libmaple/rules.mk b/libmaple/rules.mk
index a6b330a..3dcf0ce 100644
--- a/libmaple/rules.mk
+++ b/libmaple/rules.mk
@@ -3,13 +3,8 @@ sp              := $(sp).x
 dirstack_$(sp)  := $(d)
 d               := $(dir)
 BUILDDIRS       += $(BUILD_PATH)/$(d)
-BUILDDIRS       += $(BUILD_PATH)/$(d)/usb
-BUILDDIRS       += $(BUILD_PATH)/$(d)/usb/usb_lib
 
 LIBMAPLE_INCLUDES := -I$(LIBMAPLE_PATH)/include
-# FIXME: move public USB headers to include/libmaple/usb/ or something.
-LIBMAPLE_INCLUDES += -I$(LIBMAPLE_PATH)/usb         \
-                     -I$(LIBMAPLE_PATH)/usb/usb_lib
 
 # Local flags
 CFLAGS_$(d) = -I$(d) $(LIBMAPLE_INCLUDES) -Wall # -Werror
@@ -33,14 +28,7 @@ cSRCS_$(d) := adc.c                    \
               systick.c                \
               timer.c                  \
               usart.c                  \
-              util.c                   \
-              usb/usb.c                \
-              usb/usb_reg_map.c        \
-              usb/usb_cdcacm.c         \
-              usb/usb_lib/usb_core.c   \
-              usb/usb_lib/usb_init.c   \
-              usb/usb_lib/usb_mem.c    \
-              usb/usb_lib/usb_regs.c
+              util.c
 
 sSRCS_$(d) := exc.S
 
diff --git a/libmaple/usb/rules.mk b/libmaple/usb/rules.mk
new file mode 100644
index 0000000..9ef8d70
--- /dev/null
+++ b/libmaple/usb/rules.mk
@@ -0,0 +1,36 @@
+# Standard things
+sp              := $(sp).x
+dirstack_$(sp)  := $(d)
+d               := $(dir)
+BUILDDIRS       += $(BUILD_PATH)/$(d)
+BUILDDIRS       += $(BUILD_PATH)/$(d)/usb_lib
+
+# Local flags
+CFLAGS_$(d) = -I$(d) -I$(d)/usb_lib $(LIBMAPLE_INCLUDES) -Wall
+
+# Local rules and targets
+sSRCS_$(d) :=
+cSRCS_$(d) := usb.c                \
+              usb_reg_map.c        \
+              usb_cdcacm.c         \
+              usb_lib/usb_core.c   \
+              usb_lib/usb_init.c   \
+              usb_lib/usb_mem.c    \
+              usb_lib/usb_regs.c
+
+sFILES_$(d) := $(sSRCS_$(d):%=$(d)/%)
+cFILES_$(d) := $(cSRCS_$(d):%=$(d)/%)
+
+OBJS_$(d) := $(sFILES_$(d):%.S=$(BUILD_PATH)/%.o) \
+             $(cFILES_$(d):%.c=$(BUILD_PATH)/%.o)
+DEPS_$(d) := $(OBJS_$(d):%.o=%.d)
+
+$(OBJS_$(d)): TGT_CFLAGS := $(CFLAGS_$(d))
+$(OBJS_$(d)): TGT_ASFLAGS :=
+
+TGT_BIN += $(OBJS_$(d))
+
+# Standard things
+-include        $(DEPS_$(d))
+d               := $(dirstack_$(sp))
+sp              := $(basename $(sp))
diff --git a/libmaple/usb/usb.c b/libmaple/usb/usb.c
index 667b11f..6f23848 100644
--- a/libmaple/usb/usb.c
+++ b/libmaple/usb/usb.c
@@ -29,14 +29,16 @@
  * @brief USB support.
  */
 
-#include "usb.h"
+#include <libmaple/usb.h>
 
-#include "libmaple.h"
-#include "rcc.h"
+#include <libmaple/libmaple.h>
+#include <libmaple/rcc.h>
 
+/* Private headers */
 #include "usb_reg_map.h"
 #include "usb_lib_globals.h"
 
+/* usb_lib headers */
 #include "usb_type.h"
 #include "usb_core.h"
 
diff --git a/libmaple/usb/usb_cdcacm.c b/libmaple/usb/usb_cdcacm.c
index dc7b79e..07d2bc8 100644
--- a/libmaple/usb/usb_cdcacm.c
+++ b/libmaple/usb/usb_cdcacm.c
@@ -31,16 +31,18 @@
  *        routines.
  */
 
-#include "usb_cdcacm.h"
+#include <libmaple/usb_cdcacm.h>
 
-#include "nvic.h"
-#include "delay.h"
+#include <libmaple/usb.h>
+#include <libmaple/nvic.h>
+#include <libmaple/delay.h>
 
-#include "usb.h"
+/* Private headers */
 #include "usb_descriptors.h"
 #include "usb_lib_globals.h"
 #include "usb_reg_map.h"
 
+/* usb_lib headers */
 #include "usb_type.h"
 #include "usb_core.h"
 #include "usb_def.h"
diff --git a/libmaple/usb/usb_descriptors.h b/libmaple/usb/usb_descriptors.h
index 405588a..9bcb2b6 100644
--- a/libmaple/usb/usb_descriptors.h
+++ b/libmaple/usb/usb_descriptors.h
@@ -27,7 +27,7 @@
 #ifndef _USB_DESCRIPTORS_H_
 #define _USB_DESCRIPTORS_H_
 
-#include "libmaple.h"
+#include <libmaple/libmaple.h>
 
 #define USB_DESCRIPTOR_TYPE_DEVICE        0x01
 #define USB_DESCRIPTOR_TYPE_CONFIGURATION 0x02
diff --git a/libmaple/usb/usb_lib_globals.h b/libmaple/usb/usb_lib_globals.h
index a494817..1cd2754 100644
--- a/libmaple/usb/usb_lib_globals.h
+++ b/libmaple/usb/usb_lib_globals.h
@@ -27,6 +27,7 @@
 #ifndef _USB_LIB_GLOBALS_H_
 #define _USB_LIB_GLOBALS_H_
 
+/* usb_lib headers */
 #include "usb_type.h"
 #include "usb_core.h"
 
diff --git a/libmaple/usb/usb_reg_map.h b/libmaple/usb/usb_reg_map.h
index 5bf5d96..ce80842 100644
--- a/libmaple/usb/usb_reg_map.h
+++ b/libmaple/usb/usb_reg_map.h
@@ -24,8 +24,8 @@
  * SOFTWARE.
  *****************************************************************************/
 
-#include "libmaple_types.h"
-#include "util.h"
+#include <libmaple/libmaple_types.h>
+#include <libmaple/util.h>
 
 #ifndef _USB_REG_MAP_H_
 #define _USB_REG_MAP_H_