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STM32F0: Add RCC API for I2C1 clock source

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* Providing API to set/clear RCC_CFGR3_I2C1SW on STM32F0, duplicated
	from STM32F3 applies only to I2C1.
This commit is contained in:
Matt Anderson 2018-03-17 15:31:27 -04:00 committed by Karl Palsson
parent 68fce5a0ab
commit 0d5e51a8a7
2 changed files with 23 additions and 0 deletions
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3
include/libopencm3/stm32/f0/rcc.h
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@ -533,6 +533,9 @@ void rcc_set_ppre(uint32_t ppre);
void rcc_set_hpre(uint32_t hpre);
void rcc_set_prediv(uint32_t prediv);
enum rcc_osc rcc_system_clock_source(void);
void rcc_set_i2c_clock_hsi(uint32_t i2c);
void rcc_set_i2c_clock_sysclk(uint32_t i2c);
uint32_t rcc_get_i2c_clocks(void);
enum rcc_osc rcc_usb_clock_source(void);
void rcc_clock_setup_in_hse_8mhz_out_48mhz(void);
void rcc_clock_setup_in_hsi_out_48mhz(void);

20
lib/stm32/f0/rcc.c
View File

@ -39,6 +39,7 @@
#include <libopencm3/cm3/assert.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/flash.h>
#include <libopencm3/stm32/i2c.h>
/* Set the default clock frequencies */
uint32_t rcc_ahb_frequency = 8000000; /* 8MHz after reset */
@ -520,6 +521,25 @@ enum rcc_osc rcc_system_clock_source(void)
cm3_assert_not_reached();
}
void rcc_set_i2c_clock_hsi(uint32_t i2c)
{
if (i2c == I2C1) {
RCC_CFGR3 &= ~RCC_CFGR3_I2C1SW;
}
}
void rcc_set_i2c_clock_sysclk(uint32_t i2c)
{
if (i2c == I2C1) {
RCC_CFGR3 |= RCC_CFGR3_I2C1SW;
}
}
uint32_t rcc_get_i2c_clocks(void)
{
return RCC_CFGR3 & RCC_CFGR3_I2C1SW;
}
/*---------------------------------------------------------------------------*/
/** @brief RCC Get the USB Clock Source.
*