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stm32f3: rcc: Set prescalers properly.

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Copypasta from f4 rcc code was only modified to shift the result, but not clear
the existing settings properly. Add mask/shift definitions and use them
properly.
This commit is contained in:
Karl Palsson
2015-10-22 22:34:29 +00:00
parent ce9dab2a92
commit 10ef294e5d
2 changed files with 9 additions and 6 deletions
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3
include/libopencm3/stm32/f3/rcc.h
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@@ -124,6 +124,7 @@
/* PPRE2: APB high-speed prescaler (APB2) */
#define RCC_CFGR_PPRE2_SHIFT 11
#define RCC_CFGR_PPRE2_MASK 0x7
/* 0XX: HCLK not divided */
#define RCC_CFGR_PPRE2_DIV_NONE 0x0
@@ -134,6 +135,7 @@
/* PPRE1:APB Low-speed prescaler (APB1) */
#define RCC_CFGR_PPRE1_SHIFT 8
#define RCC_CFGR_PPRE1_MASK 0x7
/* 0XX: HCLK not divided */
#define RCC_CFGR_PPRE1_DIV_NONE 0x0
#define RCC_CFGR_PPRE1_DIV_2 0x4
@@ -143,6 +145,7 @@
/* HPRE: HLCK prescaler */
#define RCC_CFGR_HPRE_SHIFT 4
#define RCC_CFGR_HPRE_MASK 0xf
/* 0XXX: SYSCLK not divided */
#define RCC_CFGR_HPRE_DIV_NONE 0x0
#define RCC_CFGR_HPRE_DIV_2 0x8