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stm32f3: Some additional f3 clock functions for the i2c.

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This commit is contained in:
Federico Ruiz Ugalde 2013-06-29 19:19:07 -06:00 committed by Piotr Esden-Tempski
parent 4673348ff7
commit 66eab73570
2 changed files with 26 additions and 0 deletions
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3
include/libopencm3/stm32/f3/rcc.h
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@ -433,6 +433,9 @@ void rcc_set_main_pll_hsi(uint32_t pll);
uint32_t rcc_get_system_clock_source(void);
void rcc_backupdomain_reset(void);
void rcc_clock_setup_hsi(const clock_scale_t *clock);
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);
END_DECLS

23
lib/stm32/f3/rcc.c
View File

@ -24,6 +24,7 @@
#include <libopencm3/cm3/assert.h>
#include <libopencm3/stm32/f3/rcc.h>
#include <libopencm3/stm32/f3/flash.h>
#include <libopencm3/stm32/f3/i2c.h>
/* Set the default ppre1 and ppre2 peripheral clock frequencies after reset. */
uint32_t rcc_ppre1_frequency = 8000000;
@ -422,3 +423,25 @@ void rcc_backupdomain_reset(void)
RCC_BDCR &= ~RCC_BDCR_BDRST;
}
void rcc_set_i2c_clock_hsi(uint32_t i2c) {
if (i2c==I2C1) {
RCC_CFGR3 &= ~RCC_CFGR3_I2C1SW;
}
if (i2c==I2C2) {
RCC_CFGR3 &= ~RCC_CFGR3_I2C2SW;
}
}
void rcc_set_i2c_clock_sysclk(uint32_t i2c) {
if (i2c==I2C1) {
RCC_CFGR3 |= RCC_CFGR3_I2C1SW;
}
if (i2c==I2C2) {
RCC_CFGR3 |= RCC_CFGR3_I2C2SW;
}
}
uint32_t rcc_get_i2c_clocks(void)
{
return(RCC_CFGR3 & (RCC_CFGR3_I2C1SW | RCC_CFGR3_I2C2SW));
}