void I2C_Enable(void)
{
I2C_Struct_init.I2C_Mode = I2C_Mode_I2C;
I2C_Struct_init.I2C_Ack = I2C_Ack_Disable;
I2C_Struct_init.I2C_OwnAddress1 = IS_I2C_OWN_ADDRESS1(0x01);
I2C_Init(I2C1,&I2C_Struct_init);
I2C_Cmd(I2C1, ENABLE);
I2C_AutoEndCmd(I2C1, ENABLE);
I2C_NumberOfBytesConfig(I2C1,2);
};
/**
* @brief Initializes the I2Cx peripheral according to the specified
* parameters in the I2C_InitStruct.
* @param I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* @param I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
* contains the configuration information for the specified I2C peripheral.
* @retval None
*/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
uint16_t tmpreg = 0, freqrange = 0;
uint16_t result = 0x04;
uint32_t pclk1 = 8000000;
RCC_ClocksTypeDef rcc_clocks;
/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
/*---------------------------- I2Cx CR2 Configuration ------------------------*/
/* Get the I2Cx CR2 value */
tmpreg = I2Cx->CR2;
/* Clear frequency FREQ[5:0] bits */
tmpreg &= CR2_FREQ_Reset;
/* Get pclk1 frequency value */
RCC_GetClocksFreq(&rcc_clocks);
pclk1 = rcc_clocks.PCLK1_Frequency;
/* Set frequency bits depending on pclk1 value */
freqrange = (uint16_t)(pclk1 / 1000000);
tmpreg |= freqrange;
/* Write to I2Cx CR2 */
I2Cx->CR2 = tmpreg;
/*---------------------------- I2Cx CCR Configuration ------------------------*/
/* Disable the selected I2C peripheral to configure TRISE */
I2Cx->CR1 &= CR1_PE_Reset;
/* Reset tmpreg value */
/* Clear F/S, DUTY and CCR[11:0] bits */
tmpreg = 0;
/* Configure speed in standard mode */
if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
{
/* Standard mode speed calculate */
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed << 1));
/* Test if CCR value is under 0x4*/
if (result < 0x04)
{
/* Set minimum allowed value */
result = 0x04;
}
/* Set speed value for standard mode */
tmpreg |= result;
// [ILG]
#if defined ( __GNUC__ )
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wconversion"
#endif
/* Set Maximum Rise Time for standard mode */
I2Cx->TRISE = freqrange + 1;
// [ILG]
#if defined ( __GNUC__ )
#pragma GCC diagnostic pop
#endif
}
/* Configure speed in fast mode */
else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
{
if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
{
/* Fast mode speed calculate: Tlow/Thigh = 2 */
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 3));
}
else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
{
/* Fast mode speed calculate: Tlow/Thigh = 16/9 */
result = (uint16_t)(pclk1 / (I2C_InitStruct->I2C_ClockSpeed * 25));
/* Set DUTY bit */
result |= I2C_DutyCycle_16_9;
}
/* Test if CCR value is under 0x1*/
if ((result & CCR_CCR_Set) == 0)
{
/* Set minimum allowed value */
result |= (uint16_t)0x0001;
}
/* Set speed value and set F/S bit for fast mode */
tmpreg |= (uint16_t)(result | CCR_FS_Set);
/* Set Maximum Rise Time for fast mode */
I2Cx->TRISE = (uint16_t)(((freqrange * (uint16_t)300) / (uint16_t)1000) + (uint16_t)1);
}
/* Write to I2Cx CCR */
I2Cx->CCR = tmpreg;
/* Enable the selected I2C peripheral */
I2Cx->CR1 |= CR1_PE_Set;
/*---------------------------- I2Cx CR1 Configuration ------------------------*/
/* Get the I2Cx CR1 value */
tmpreg = I2Cx->CR1;
/* Clear ACK, SMBTYPE and SMBUS bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure I2Cx: mode and acknowledgement */
/* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
/* Set ACK bit according to I2C_Ack value */
tmpreg |= (uint16_t)((uint32_t)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
/* Write to I2Cx CR1 */
I2Cx->CR1 = tmpreg;
/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
/* Set I2Cx Own Address1 and acknowledged address */
I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
}
/*******************************************************************************
* Function Name : I2C_Init
* Description : Initializes the I2Cx peripheral according to the specified
* parameters in the I2C_InitStruct.
* Input : - I2Cx: where x can be 1 or 2 to select the I2C peripheral.
* - I2C_InitStruct: pointer to a I2C_InitTypeDef structure that
* contains the configuration information for the specified
* I2C peripheral.
* Output : None
* Return : None
******************************************************************************/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct)
{
u16 tmpreg = 0, freqrange = 0;
u16 result = 0x04;
u32 pclk1clock = 12000000;
RCC_ClocksTypeDef RCC_Clocks;
/* Check the parameters */
assert_param(IS_I2C_MODE(I2C_InitStruct->I2C_Mode));
assert_param(IS_I2C_DUTY_CYCLE(I2C_InitStruct->I2C_DutyCycle));
assert_param(IS_I2C_OWN_ADDRESS1(I2C_InitStruct->I2C_OwnAddress1));
assert_param(IS_I2C_ACK_STATE(I2C_InitStruct->I2C_Ack));
assert_param(IS_I2C_ACKNOWLEDGE_ADDRESS(I2C_InitStruct->I2C_AcknowledgedAddress));
assert_param(IS_I2C_CLOCK_SPEED(I2C_InitStruct->I2C_ClockSpeed));
/*---------------------------- I2Cx CR2 Configuration ------------------------*/
/* Get the I2Cx CR2 value */
tmpreg = I2Cx->CR2;
/* Clear frequency FREQ[5:0] bits */
tmpreg &= CR2_FREQ_Reset;
/* Get PCLK1Clock frequency value */
RCC_GetClocksFreq(&RCC_Clocks);
pclk1clock = RCC_Clocks.PCLK1_Frequency;
/* Set frequency bits depending on PCLK1Clock value */
freqrange = (u16)(pclk1clock / 1000000);
tmpreg |= freqrange;
/* Write to I2Cx CR2 */
I2Cx->CR2 = tmpreg;
/*---------------------------- I2Cx CCR Configuration ------------------------*/
/* Disable I2Cx to configure TRISE */
I2C_Cmd(I2Cx, DISABLE);
/* Reset tmpreg value */
/* Clear F/S, DUTY and CCR[11:0] bits */
tmpreg = 0;
/* Configure speed in standard mode */
if (I2C_InitStruct->I2C_ClockSpeed <= 100000)
{
/* Standard mode speed calculate */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed << 1));
/* Test if CCR value is under 0x4*/
if (result < 0x04)
{
/* Set minimum allowed value */
result = 0x04;
}
/* Set speed value for standard mode */
tmpreg |= result;
/* Set Maximum Rise Time: ((1000/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = freqrange + 1;
}
/* Configure speed in fast mode */
else /*(I2C_InitStruct->I2C_ClockSpeed <= 400000)*/
{
if (I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_2)
{
/* Fast mode speed calculate: Tlow/Thigh = 2 */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed * 3));
}
else /*I2C_InitStruct->I2C_DutyCycle == I2C_DutyCycle_16_9*/
{
/* Fast mode speed calculate: Tlow/Thigh = 16/9 */
result = (u16)(pclk1clock / (I2C_InitStruct->I2C_ClockSpeed * 25));
/* Set DUTY bit */
result |= I2C_DutyCycle_16_9;
}
/* Test if CCR value is under 0x1*/
if ((result & CCR_CCR_Set) == 0)
{
/* Set minimum allowed value */
result |= (u16)0x0001;
}
/* Set speed value and set F/S bit for fast mode */
tmpreg |= result | CCR_FS_Set;
/* Set Maximum Rise Time: ((300/(1000000000/pclk1clock))+1 */
I2Cx->TRISE = (u16)(((freqrange * 300) / 1000) + 1);
}
/* Write to I2Cx CCR */
I2Cx->CCR = tmpreg;
/* Enable I2Cx */
I2C_Cmd(I2Cx, ENABLE);
/*---------------------------- I2Cx CR1 Configuration ------------------------*/
/* Get the I2Cx CR1 value */
tmpreg = I2Cx->CR1;
/* Clear ACK, SMBTYPE and SMBUS bits */
tmpreg &= CR1_CLEAR_Mask;
/* Configure I2Cx: mode and acknowledgement */
/* Set SMBTYPE and SMBUS bits according to I2C_Mode value */
/* Set ACK bit according to I2C_Ack value */
tmpreg |= (u16)((u32)I2C_InitStruct->I2C_Mode | I2C_InitStruct->I2C_Ack);
/* Write to I2Cx CR1 */
I2Cx->CR1 = tmpreg;
/*---------------------------- I2Cx OAR1 Configuration -----------------------*/
/* Set I2Cx Own Address1 and acknowledged address */
I2Cx->OAR1 = (I2C_InitStruct->I2C_AcknowledgedAddress | I2C_InitStruct->I2C_OwnAddress1);
}