From ac520b0676466f2240a904262b9146a5b466da03 Mon Sep 17 00:00:00 2001
From: treymarc <trey.marc@gmail.com>
Date: Sat, 24 May 2014 20:40:12 +0000
Subject: [PATCH] usf hardware fpu with target stm32f30x

---
 Makefile                    | 2 +-
 src/drivers/system_common.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index 68d47c857..7e183d892 100644
--- a/Makefile
+++ b/Makefile
@@ -60,7 +60,7 @@ INCLUDE_DIRS := $(INCLUDE_DIRS) \
 
 LD_SCRIPT	 = $(ROOT)/stm32_flash_f303.ld
 
-ARCH_FLAGS	 = -mthumb -mcpu=cortex-m4
+ARCH_FLAGS	 = -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 
 DEVICE_FLAGS = -DSTM32F303xC
 TARGET_FLAGS = -D$(TARGET)
 ifeq ($(TARGET),CHEBUZZF3)
diff --git a/src/drivers/system_common.c b/src/drivers/system_common.c
index b07b276ec..73f5d9ace 100755
--- a/src/drivers/system_common.c
+++ b/src/drivers/system_common.c
@@ -59,6 +59,12 @@ uint32_t millis(void)
 
 void systemInit(bool overclock)
 {
+
+#ifdef STM32F303xC
+    // start fpu
+    SCB->CPACR = (0x3 << (10*2)) | (0x3 << (11*2));
+#endif
+
     struct {
         GPIO_TypeDef *gpio;
         gpio_config_t cfg;