diff options
Diffstat (limited to 'libmaple/flash.c')
| -rw-r--r-- | libmaple/flash.c | 43 |
1 files changed, 27 insertions, 16 deletions
diff --git a/libmaple/flash.c b/libmaple/flash.c index 9442c44..3fd35d6 100644 --- a/libmaple/flash.c +++ b/libmaple/flash.c @@ -25,29 +25,40 @@ #include "libmaple.h" #include "flash.h" -#define ACR_PRFTBE ((uint32)0xFFFFFFEF) -#define ACR_PRFTBE_ENABLE ((uint32)0x00000010) /* FLASH Prefetch Buffer Enable */ -#define ACR_PRFTBE_DISABLE ((uint32)0x00000000) /* FLASH Prefetch Buffer Disable */ +#define FLASH_BASE 0x40022000 +#define FLASH_ACR FLASH_BASE -#define ACR_LATENCY ((uint32)0x00000038) -#define ACR_LATENCY_0 ((uint32)0x00000000) /* FLASH Zero Latency cycle */ -#define ACR_LATENCY_1 ((uint32)0x00000001) /* FLASH One Latency cycle */ -#define ACR_LATENCY_2 ((uint32)0x00000002) /* FLASH Two Latency cycles */ +#define ACR_PRFTBE BIT(4) +#define ACR_PRFTBE_ENABLE BIT(4) +/* flash wait states */ +#define ACR_LATENCY (0x7) + +#define FLASH_WRITE_ACR(val) __write(FLASH_ACR, val) +#define FLASH_READ_ACR() __read(FLASH_ACR) + + +/** + * @brief turn on the hardware prefetcher + */ void flash_enable_prefetch(void) { - uint32 acr = __read(FLASH_ACR); + uint32 val = FLASH_READ_ACR(); - acr &= ACR_PRFTBE; - acr |= ACR_PRFTBE_ENABLE; + val |= ACR_PRFTBE_ENABLE; - __write(FLASH_ACR, acr); + FLASH_WRITE_ACR(val); } -void flash_set_latency(void) { - uint32 acr = __read(FLASH_ACR); - acr &= ACR_LATENCY; - acr |= ACR_LATENCY_2; +/** + * @brief set flash wait states + * @param number of wait states + */ +void flash_set_latency(uint32 wait_states) { + uint32 val = FLASH_READ_ACR(); + + val &= ~ACR_LATENCY; + val |= wait_states; - __write(FLASH_ACR, acr); + FLASH_WRITE_ACR(val); } |