From 04ee498b46393250c31606e526c28cb3b2b870ed Mon Sep 17 00:00:00 2001 From: Marti Bolivar Date: Tue, 15 Mar 2011 14:26:30 -0400 Subject: Flash refactor --- libmaple/flash.c | 39 ++++++++++++++------------------------- 1 file changed, 14 insertions(+), 25 deletions(-) (limited to 'libmaple/flash.c') diff --git a/libmaple/flash.c b/libmaple/flash.c index 1d7bfa6..c921256 100644 --- a/libmaple/flash.c +++ b/libmaple/flash.c @@ -28,41 +28,30 @@ #include "libmaple.h" #include "flash.h" - -/* flash registers */ -#define FLASH_BASE 0x40022000 -#define FLASH_ACR FLASH_BASE - -/* flash prefetcher */ -#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) +#include "bitband.h" /** - * @brief turn on the hardware prefetcher + * @brief Turn on the hardware prefetcher. */ void flash_enable_prefetch(void) { - uint32 val = FLASH_READ_ACR(); - - val |= ACR_PRFTBE_ENABLE; - - FLASH_WRITE_ACR(val); + *bb_perip(&FLASH_BASE->ACR, FLASH_ACR_PRFTBE_BIT) = 1; } /** - * @brief set flash wait states - * @param number of wait states + * @brief Set flash wait states + * + * See ST PM0042, section 3.1 for restrictions on the acceptable value + * of wait_states for a given SYSCLK configuration. + * + * @param wait_states number of wait states (one of + * FLASH_WAIT_STATE_0, FLASH_WAIT_STATE_1, + * FLASH_WAIT_STATE_2). */ void flash_set_latency(uint32 wait_states) { - uint32 val = FLASH_READ_ACR(); + uint32 val = FLASH_BASE->ACR; - val &= ~ACR_LATENCY; + val &= ~FLASH_ACR_LATENCY; val |= wait_states; - FLASH_WRITE_ACR(val); + FLASH_BASE->ACR = val; } -- cgit v1.2.3