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stm32: i2c: Support auto speed configuration

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For both v1 and v2, support automatic calculation of timing registers
for 100khz and 400khz i2c modes.

Based on work by Chuck in
https://github.com/libopencm3/libopencm3/pull/470 for v1
This commit is contained in:
Karl Palsson
2017-03-23 23:56:34 +00:00
parent f3df01f14e
commit 6678da39bd
4 changed files with 87 additions and 0 deletions
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11
include/libopencm3/stm32/common/i2c_common_v1.h
View File

@@ -362,6 +362,16 @@ specific memorymap.h header before including this header file.*/
/* --- I2C function prototypes---------------------------------------------- */
/**
* I2C speed modes.
*/
enum i2c_speeds {
i2c_speed_sm_100k,
i2c_speed_fm_400k,
i2c_speed_fmp_1m,
i2c_speed_unknown
};
BEGIN_DECLS
void i2c_reset(uint32_t i2c);
@@ -395,6 +405,7 @@ void i2c_disable_dma(uint32_t i2c);
void i2c_set_dma_last_transfer(uint32_t i2c);
void i2c_clear_dma_last_transfer(uint32_t i2c);
void i2c_transfer7(uint32_t i2c, uint8_t addr, uint8_t *w, size_t wn, uint8_t *r, size_t rn);
void i2c_set_speed(uint32_t i2c, enum i2c_speeds speed, uint32_t clock_megahz);
END_DECLS

11
include/libopencm3/stm32/common/i2c_common_v2.h
View File

@@ -386,6 +386,16 @@ specific memorymap.h header before including this header file.*/
/* --- I2C function prototypes---------------------------------------------- */
/**
* I2C speed modes.
*/
enum i2c_speeds {
i2c_speed_sm_100k,
i2c_speed_fm_400k,
i2c_speed_fmp_1m,
i2c_speed_unknown
};
BEGIN_DECLS
void i2c_reset(uint32_t i2c);
@@ -431,6 +441,7 @@ void i2c_disable_rxdma(uint32_t i2c);
void i2c_enable_txdma(uint32_t i2c);
void i2c_disable_txdma(uint32_t i2c);
void i2c_transfer7(uint32_t i2c, uint8_t addr, uint8_t *w, size_t wn, uint8_t *r, size_t rn);
void i2c_set_speed(uint32_t i2c, enum i2c_speeds speed, uint32_t clock_megahz);
END_DECLS