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fsl-i2c: return the actual configured baudrate #9

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fsl-i2c: return the actual configured baudrate #9

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12 changes: 9 additions & 3 deletions drivers/i2c/fsl_i2c.c
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Original file line number Diff line number Diff line change
Expand Up @@ -556,12 +556,14 @@ static void I2C_TransferCommonIRQHandler(I2C_Type *base, void *handle)
* param base I2C base pointer
* param masterConfig A pointer to the master configuration structure
* param srcClock_Hz I2C peripheral clock frequency in Hz
* return the actual applied baudrate
*/
void I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uint32_t srcClock_Hz)
uint32_t I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uint32_t srcClock_Hz)
{
assert(NULL != masterConfig);
assert(0U != srcClock_Hz);

uint32_t baudrate;
/* Temporary register for filter read. */
uint8_t fltReg;
#if defined(FSL_FEATURE_I2C_HAS_DOUBLE_BUFFER_ENABLE) && FSL_FEATURE_I2C_HAS_DOUBLE_BUFFER_ENABLE
Expand Down Expand Up @@ -592,7 +594,7 @@ void I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uin
I2C_MasterClearStatusFlags(base, (uint32_t)kClearFlags);

/* Configure baud rate. */
I2C_MasterSetBaudRate(base, masterConfig->baudRate_Bps, srcClock_Hz);
baudrate = I2C_MasterSetBaudRate(base, masterConfig->baudRate_Bps, srcClock_Hz);

/* Read out the FLT register. */
fltReg = base->FLT;
Expand All @@ -618,6 +620,7 @@ void I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uin
s2Reg = (uint8_t)(base->S2 & (~I2C_S2_DFEN_MASK));
base->S2 = s2Reg | I2C_S2_DFEN(masterConfig->enableDoubleBuffering);
#endif
return baudrate;
}

/*!
Expand Down Expand Up @@ -764,8 +767,9 @@ void I2C_DisableInterrupts(I2C_Type *base, uint32_t mask)
* param base I2C base pointer
* param baudRate_Bps the baud rate value in bps
* param srcClock_Hz Source clock
* return the actual applied baudrate
*/
void I2C_MasterSetBaudRate(I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz)
uint32_t I2C_MasterSetBaudRate(I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz)
{
uint32_t multiplier;
uint32_t computedRate;
Expand Down Expand Up @@ -814,6 +818,8 @@ void I2C_MasterSetBaudRate(I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcCl
#endif
/* Set frequency register based on best settings. */
base->F = I2C_F_MULT(bestMult) | I2C_F_ICR(bestIcr);

return computedRate;
}

/*!
Expand Down
6 changes: 4 additions & 2 deletions drivers/i2c/fsl_i2c.h
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Original file line number Diff line number Diff line change
Expand Up @@ -294,8 +294,9 @@ extern "C" {
* @param base I2C base pointer
* @param masterConfig A pointer to the master configuration structure
* @param srcClock_Hz I2C peripheral clock frequency in Hz
* @return the actual applied baudrate
*/
void I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uint32_t srcClock_Hz);
uint32_t I2C_MasterInit(I2C_Type *base, const i2c_master_config_t *masterConfig, uint32_t srcClock_Hz);

/*!
* @brief Initializes the I2C peripheral. Call this API to ungate the I2C clock
Expand Down Expand Up @@ -555,8 +556,9 @@ static inline uint32_t I2C_GetDataRegAddr(I2C_Type *base)
* @param base I2C base pointer
* @param baudRate_Bps the baud rate value in bps
* @param srcClock_Hz Source clock
* @return the actual applied baudrate
*/
void I2C_MasterSetBaudRate(I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz);
uint32_t I2C_MasterSetBaudRate(I2C_Type *base, uint32_t baudRate_Bps, uint32_t srcClock_Hz);

/*!
* @brief Sends a START on the I2C bus.
Expand Down