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stm32f7: rcc: intial stubs support

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Reviewed-by: Karl Palsson <karlp@tweak.net.au>
(Added defines and used them)
This commit is contained in:
Sync 2015-10-22 13:29:43 +02:00 committed by Karl Palsson
parent 7ee1d948e9
commit 3fc0c9d001
3 changed files with 15 additions and 1 deletions
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1
include/libopencm3/stm32/f7/rcc.h
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@ -159,6 +159,7 @@
/* SWS: System clock switch status */ /* SWS: System clock switch status */
#define RCC_CFGR_SWS_SHIFT 2 #define RCC_CFGR_SWS_SHIFT 2
#define RCC_CFGR_SWS_MASK 0x3
#define RCC_CFGR_SWS_HSI 0x0 #define RCC_CFGR_SWS_HSI 0x0
#define RCC_CFGR_SWS_HSE 0x1 #define RCC_CFGR_SWS_HSE 0x1
#define RCC_CFGR_SWS_PLL 0x2 #define RCC_CFGR_SWS_PLL 0x2

4
lib/stm32/f7/Makefile
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@ -40,7 +40,9 @@ TGT_CFLAGS = -Os -g \
ARFLAGS = rcs ARFLAGS = rcs
OBJS = gpio.o gpio_common_all.o gpio_common_f0234.o OBJS = rcc.o gpio.o gpio_common_all.o gpio_common_f0234.o
OBJS += rcc_common_all.o
OBJS += rng_common_v1.o OBJS += rng_common_v1.o

11
lib/stm32/f7/rcc.c Normal file
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@ -0,0 +1,11 @@
#include <libopencm3/stm32/rcc.h>
uint32_t rcc_ahb_frequency = 16000000;
uint32_t rcc_apb1_frequency = 16000000;
uint32_t rcc_apb2_frequency = 16000000;
uint32_t rcc_system_clock_source(void)
{
/* Return the clock source which is used as system clock. */
return (RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK;
}