diff options
Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_start.c')
| -rw-r--r-- | nuttx/arch/arm/src/stm32/stm32_start.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/stm32/stm32_start.c b/nuttx/arch/arm/src/stm32/stm32_start.c index ce7aeb53a..7209d3cb9 100644 --- a/nuttx/arch/arm/src/stm32/stm32_start.c +++ b/nuttx/arch/arm/src/stm32/stm32_start.c @@ -49,6 +49,9 @@ #include "stm32_internal.h" #include "stm32_gpio.h" +#ifdef CONFIG_ARCH_FPU +# include "nvic.h" +#endif /**************************************************************************** * Name: showprogress @@ -68,6 +71,33 @@ * Public Functions ****************************************************************************/ + /**************************************************************************** + * Name: stm32_fpuconfig + * + * Description: + * Configure the FPU. The the MCU has an FPU, then enable full access + * to coprocessors CP10 and CP11. + * + * This is implemented as a macro because the stack has not yet been + * initialized. + * + ****************************************************************************/ + +#ifdef CONFIG_ARCH_FPU +# define stm32_fpuconfig() \ +{ \ + uint32_t regval = getreg32(NVIC_CPACR); \ + regval |= ((3 << (2*10)) | (3 << (2*11))); \ + putreg32(regval, NVIC_CPACR); \ +} +#else +# define stm32_fpuconfig() +#endif + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + /**************************************************************************** * Name: _start * @@ -84,6 +114,7 @@ void __start(void) /* Configure the uart so that we can get debug output as soon as possible */ stm32_clockconfig(); + stm32_fpuconfig(); stm32_lowsetup(); stm32_gpioinit(); showprogress('A'); |