stm32f4xx_i2c.h

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/* Define to prevent recursive inclusion -------------------------------------*/
#ifndef __STM32F4xx_I2C_H
#define __STM32F4xx_I2C_H

#ifdef __cplusplus
 extern "C" {
#endif

/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx.h"

/* Exported types ------------------------------------------------------------*/

typedef struct
{
  uint32_t I2C_ClockSpeed;          
  uint16_t I2C_Mode;                
  uint16_t I2C_DutyCycle;           
  uint16_t I2C_OwnAddress1;         
  uint16_t I2C_Ack;                 
  uint16_t I2C_AcknowledgedAddress; 
}I2C_InitTypeDef;

/* Exported constants --------------------------------------------------------*/


#define IS_I2C_ALL_PERIPH(PERIPH) (((PERIPH) == I2C1) || \
                                   ((PERIPH) == I2C2) || \
                                   ((PERIPH) == I2C3))

#define IS_I2C_DIGITAL_FILTER(FILTER)   ((FILTER) <= 0x0000000F)

#define I2C_Mode_I2C                    ((uint16_t)0x0000)
#define I2C_Mode_SMBusDevice            ((uint16_t)0x0002)  
#define I2C_Mode_SMBusHost              ((uint16_t)0x000A)
#define IS_I2C_MODE(MODE) (((MODE) == I2C_Mode_I2C) || \
                           ((MODE) == I2C_Mode_SMBusDevice) || \
                           ((MODE) == I2C_Mode_SMBusHost))

#define I2C_DutyCycle_16_9              ((uint16_t)0x4000) 
#define I2C_DutyCycle_2                 ((uint16_t)0xBFFF) 
#define IS_I2C_DUTY_CYCLE(CYCLE) (((CYCLE) == I2C_DutyCycle_16_9) || \
                                  ((CYCLE) == I2C_DutyCycle_2))

#define I2C_Ack_Enable                  ((uint16_t)0x0400)
#define I2C_Ack_Disable                 ((uint16_t)0x0000)
#define IS_I2C_ACK_STATE(STATE) (((STATE) == I2C_Ack_Enable) || \
                                 ((STATE) == I2C_Ack_Disable))

#define  I2C_Direction_Transmitter      ((uint8_t)0x00)
#define  I2C_Direction_Receiver         ((uint8_t)0x01)
#define IS_I2C_DIRECTION(DIRECTION) (((DIRECTION) == I2C_Direction_Transmitter) || \
                                     ((DIRECTION) == I2C_Direction_Receiver))

#define I2C_AcknowledgedAddress_7bit    ((uint16_t)0x4000)
#define I2C_AcknowledgedAddress_10bit   ((uint16_t)0xC000)
#define IS_I2C_ACKNOWLEDGE_ADDRESS(ADDRESS) (((ADDRESS) == I2C_AcknowledgedAddress_7bit) || \
                                             ((ADDRESS) == I2C_AcknowledgedAddress_10bit))

#define I2C_Register_CR1                ((uint8_t)0x00)
#define I2C_Register_CR2                ((uint8_t)0x04)
#define I2C_Register_OAR1               ((uint8_t)0x08)
#define I2C_Register_OAR2               ((uint8_t)0x0C)
#define I2C_Register_DR                 ((uint8_t)0x10)
#define I2C_Register_SR1                ((uint8_t)0x14)
#define I2C_Register_SR2                ((uint8_t)0x18)
#define I2C_Register_CCR                ((uint8_t)0x1C)
#define I2C_Register_TRISE              ((uint8_t)0x20)
#define IS_I2C_REGISTER(REGISTER) (((REGISTER) == I2C_Register_CR1) || \
                                   ((REGISTER) == I2C_Register_CR2) || \
                                   ((REGISTER) == I2C_Register_OAR1) || \
                                   ((REGISTER) == I2C_Register_OAR2) || \
                                   ((REGISTER) == I2C_Register_DR) || \
                                   ((REGISTER) == I2C_Register_SR1) || \
                                   ((REGISTER) == I2C_Register_SR2) || \
                                   ((REGISTER) == I2C_Register_CCR) || \
                                   ((REGISTER) == I2C_Register_TRISE))

#define I2C_NACKPosition_Next           ((uint16_t)0x0800)
#define I2C_NACKPosition_Current        ((uint16_t)0xF7FF)
#define IS_I2C_NACK_POSITION(POSITION)  (((POSITION) == I2C_NACKPosition_Next) || \
                                         ((POSITION) == I2C_NACKPosition_Current))

#define I2C_SMBusAlert_Low              ((uint16_t)0x2000)
#define I2C_SMBusAlert_High             ((uint16_t)0xDFFF)
#define IS_I2C_SMBUS_ALERT(ALERT) (((ALERT) == I2C_SMBusAlert_Low) || \
                                   ((ALERT) == I2C_SMBusAlert_High))

#define I2C_PECPosition_Next            ((uint16_t)0x0800)
#define I2C_PECPosition_Current         ((uint16_t)0xF7FF)
#define IS_I2C_PEC_POSITION(POSITION) (((POSITION) == I2C_PECPosition_Next) || \
                                       ((POSITION) == I2C_PECPosition_Current))

#define I2C_IT_BUF                      ((uint16_t)0x0400)
#define I2C_IT_EVT                      ((uint16_t)0x0200)
#define I2C_IT_ERR                      ((uint16_t)0x0100)
#define IS_I2C_CONFIG_IT(IT) ((((IT) & (uint16_t)0xF8FF) == 0x00) && ((IT) != 0x00))

#define I2C_IT_SMBALERT                 ((uint32_t)0x01008000)
#define I2C_IT_TIMEOUT                  ((uint32_t)0x01004000)
#define I2C_IT_PECERR                   ((uint32_t)0x01001000)
#define I2C_IT_OVR                      ((uint32_t)0x01000800)
#define I2C_IT_AF                       ((uint32_t)0x01000400)
#define I2C_IT_ARLO                     ((uint32_t)0x01000200)
#define I2C_IT_BERR                     ((uint32_t)0x01000100)
#define I2C_IT_TXE                      ((uint32_t)0x06000080)
#define I2C_IT_RXNE                     ((uint32_t)0x06000040)
#define I2C_IT_STOPF                    ((uint32_t)0x02000010)
#define I2C_IT_ADD10                    ((uint32_t)0x02000008)
#define I2C_IT_BTF                      ((uint32_t)0x02000004)
#define I2C_IT_ADDR                     ((uint32_t)0x02000002)
#define I2C_IT_SB                       ((uint32_t)0x02000001)

#define IS_I2C_CLEAR_IT(IT) ((((IT) & (uint16_t)0x20FF) == 0x00) && ((IT) != (uint16_t)0x00))

#define IS_I2C_GET_IT(IT) (((IT) == I2C_IT_SMBALERT) || ((IT) == I2C_IT_TIMEOUT) || \
                           ((IT) == I2C_IT_PECERR) || ((IT) == I2C_IT_OVR) || \
                           ((IT) == I2C_IT_AF) || ((IT) == I2C_IT_ARLO) || \
                           ((IT) == I2C_IT_BERR) || ((IT) == I2C_IT_TXE) || \
                           ((IT) == I2C_IT_RXNE) || ((IT) == I2C_IT_STOPF) || \
                           ((IT) == I2C_IT_ADD10) || ((IT) == I2C_IT_BTF) || \
                           ((IT) == I2C_IT_ADDR) || ((IT) == I2C_IT_SB))

#define I2C_FLAG_DUALF                  ((uint32_t)0x00800000)
#define I2C_FLAG_SMBHOST                ((uint32_t)0x00400000)
#define I2C_FLAG_SMBDEFAULT             ((uint32_t)0x00200000)
#define I2C_FLAG_GENCALL                ((uint32_t)0x00100000)
#define I2C_FLAG_TRA                    ((uint32_t)0x00040000)
#define I2C_FLAG_BUSY                   ((uint32_t)0x00020000)
#define I2C_FLAG_MSL                    ((uint32_t)0x00010000)

#define I2C_FLAG_SMBALERT               ((uint32_t)0x10008000)
#define I2C_FLAG_TIMEOUT                ((uint32_t)0x10004000)
#define I2C_FLAG_PECERR                 ((uint32_t)0x10001000)
#define I2C_FLAG_OVR                    ((uint32_t)0x10000800)
#define I2C_FLAG_AF                     ((uint32_t)0x10000400)
#define I2C_FLAG_ARLO                   ((uint32_t)0x10000200)
#define I2C_FLAG_BERR                   ((uint32_t)0x10000100)
#define I2C_FLAG_TXE                    ((uint32_t)0x10000080)
#define I2C_FLAG_RXNE                   ((uint32_t)0x10000040)
#define I2C_FLAG_STOPF                  ((uint32_t)0x10000010)
#define I2C_FLAG_ADD10                  ((uint32_t)0x10000008)
#define I2C_FLAG_BTF                    ((uint32_t)0x10000004)
#define I2C_FLAG_ADDR                   ((uint32_t)0x10000002)
#define I2C_FLAG_SB                     ((uint32_t)0x10000001)

#define IS_I2C_CLEAR_FLAG(FLAG) ((((FLAG) & (uint16_t)0x20FF) == 0x00) && ((FLAG) != (uint16_t)0x00))

#define IS_I2C_GET_FLAG(FLAG) (((FLAG) == I2C_FLAG_DUALF) || ((FLAG) == I2C_FLAG_SMBHOST) || \
                               ((FLAG) == I2C_FLAG_SMBDEFAULT) || ((FLAG) == I2C_FLAG_GENCALL) || \
                               ((FLAG) == I2C_FLAG_TRA) || ((FLAG) == I2C_FLAG_BUSY) || \
                               ((FLAG) == I2C_FLAG_MSL) || ((FLAG) == I2C_FLAG_SMBALERT) || \
                               ((FLAG) == I2C_FLAG_TIMEOUT) || ((FLAG) == I2C_FLAG_PECERR) || \
                               ((FLAG) == I2C_FLAG_OVR) || ((FLAG) == I2C_FLAG_AF) || \
                               ((FLAG) == I2C_FLAG_ARLO) || ((FLAG) == I2C_FLAG_BERR) || \
                               ((FLAG) == I2C_FLAG_TXE) || ((FLAG) == I2C_FLAG_RXNE) || \
                               ((FLAG) == I2C_FLAG_STOPF) || ((FLAG) == I2C_FLAG_ADD10) || \
                               ((FLAG) == I2C_FLAG_BTF) || ((FLAG) == I2C_FLAG_ADDR) || \
                               ((FLAG) == I2C_FLAG_SB))

/* --EV5 */
#define  I2C_EVENT_MASTER_MODE_SELECT                      ((uint32_t)0x00030001)  /* BUSY, MSL and SB flag */

/* --EV6 */
#define  I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED        ((uint32_t)0x00070082)  /* BUSY, MSL, ADDR, TXE and TRA flags */
#define  I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED           ((uint32_t)0x00030002)  /* BUSY, MSL and ADDR flags */
/* --EV9 */
#define  I2C_EVENT_MASTER_MODE_ADDRESS10                   ((uint32_t)0x00030008)  /* BUSY, MSL and ADD10 flags */

/* Master RECEIVER mode -----------------------------*/ 
/* --EV7 */
#define  I2C_EVENT_MASTER_BYTE_RECEIVED                    ((uint32_t)0x00030040)  /* BUSY, MSL and RXNE flags */

/* Master TRANSMITTER mode --------------------------*/
/* --EV8 */
#define I2C_EVENT_MASTER_BYTE_TRANSMITTING                 ((uint32_t)0x00070080) /* TRA, BUSY, MSL, TXE flags */
/* --EV8_2 */
#define  I2C_EVENT_MASTER_BYTE_TRANSMITTED                 ((uint32_t)0x00070084)  /* TRA, BUSY, MSL, TXE and BTF flags */


/* --EV1  (all the events below are variants of EV1) */   
/* 1) Case of One Single Address managed by the slave */
#define  I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED          ((uint32_t)0x00020002) /* BUSY and ADDR flags */
#define  I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED       ((uint32_t)0x00060082) /* TRA, BUSY, TXE and ADDR flags */

/* 2) Case of Dual address managed by the slave */
#define  I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED    ((uint32_t)0x00820000)  /* DUALF and BUSY flags */
#define  I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED ((uint32_t)0x00860080)  /* DUALF, TRA, BUSY and TXE flags */

/* 3) Case of General Call enabled for the slave */
#define  I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED        ((uint32_t)0x00120000)  /* GENCALL and BUSY flags */

/* Slave RECEIVER mode --------------------------*/ 
/* --EV2 */
#define  I2C_EVENT_SLAVE_BYTE_RECEIVED                     ((uint32_t)0x00020040)  /* BUSY and RXNE flags */
/* --EV4  */
#define  I2C_EVENT_SLAVE_STOP_DETECTED                     ((uint32_t)0x00000010)  /* STOPF flag */

/* Slave TRANSMITTER mode -----------------------*/
/* --EV3 */
#define  I2C_EVENT_SLAVE_BYTE_TRANSMITTED                  ((uint32_t)0x00060084)  /* TRA, BUSY, TXE and BTF flags */
#define  I2C_EVENT_SLAVE_BYTE_TRANSMITTING                 ((uint32_t)0x00060080)  /* TRA, BUSY and TXE flags */
/* --EV3_2 */
#define  I2C_EVENT_SLAVE_ACK_FAILURE                       ((uint32_t)0x00000400)  /* AF flag */

/*
 ===============================================================================
                          End of Events Description
 ===============================================================================
 */

#define IS_I2C_EVENT(EVENT) (((EVENT) == I2C_EVENT_SLAVE_TRANSMITTER_ADDRESS_MATCHED) || \
                             ((EVENT) == I2C_EVENT_SLAVE_RECEIVER_ADDRESS_MATCHED) || \
                             ((EVENT) == I2C_EVENT_SLAVE_TRANSMITTER_SECONDADDRESS_MATCHED) || \
                             ((EVENT) == I2C_EVENT_SLAVE_RECEIVER_SECONDADDRESS_MATCHED) || \
                             ((EVENT) == I2C_EVENT_SLAVE_GENERALCALLADDRESS_MATCHED) || \
                             ((EVENT) == I2C_EVENT_SLAVE_BYTE_RECEIVED) || \
                             ((EVENT) == (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_DUALF)) || \
                             ((EVENT) == (I2C_EVENT_SLAVE_BYTE_RECEIVED | I2C_FLAG_GENCALL)) || \
                             ((EVENT) == I2C_EVENT_SLAVE_BYTE_TRANSMITTED) || \
                             ((EVENT) == (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_DUALF)) || \
                             ((EVENT) == (I2C_EVENT_SLAVE_BYTE_TRANSMITTED | I2C_FLAG_GENCALL)) || \
                             ((EVENT) == I2C_EVENT_SLAVE_STOP_DETECTED) || \
                             ((EVENT) == I2C_EVENT_MASTER_MODE_SELECT) || \
                             ((EVENT) == I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED) || \
                             ((EVENT) == I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) || \
                             ((EVENT) == I2C_EVENT_MASTER_BYTE_RECEIVED) || \
                             ((EVENT) == I2C_EVENT_MASTER_BYTE_TRANSMITTED) || \
                             ((EVENT) == I2C_EVENT_MASTER_BYTE_TRANSMITTING) || \
                             ((EVENT) == I2C_EVENT_MASTER_MODE_ADDRESS10) || \
                             ((EVENT) == I2C_EVENT_SLAVE_ACK_FAILURE))

#define IS_I2C_OWN_ADDRESS1(ADDRESS1) ((ADDRESS1) <= 0x3FF)

#define IS_I2C_CLOCK_SPEED(SPEED) (((SPEED) >= 0x1) && ((SPEED) <= 400000))

/* Exported macro ------------------------------------------------------------*/
/* Exported functions --------------------------------------------------------*/ 

/*  Function used to set the I2C configuration to the default reset state *****/
void I2C_DeInit(I2C_TypeDef* I2Cx);

/* Initialization and Configuration functions *********************************/
void I2C_Init(I2C_TypeDef* I2Cx, I2C_InitTypeDef* I2C_InitStruct);
void I2C_StructInit(I2C_InitTypeDef* I2C_InitStruct);
void I2C_Cmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_DigitalFilterConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DigitalFilter);
void I2C_AnalogFilterCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_GenerateSTART(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_GenerateSTOP(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_Send7bitAddress(I2C_TypeDef* I2Cx, uint8_t Address, uint8_t I2C_Direction);
void I2C_AcknowledgeConfig(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_OwnAddress2Config(I2C_TypeDef* I2Cx, uint8_t Address);
void I2C_DualAddressCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_GeneralCallCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_SoftwareResetCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_StretchClockCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_FastModeDutyCycleConfig(I2C_TypeDef* I2Cx, uint16_t I2C_DutyCycle);
void I2C_NACKPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_NACKPosition);
void I2C_SMBusAlertConfig(I2C_TypeDef* I2Cx, uint16_t I2C_SMBusAlert);
void I2C_ARPCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);

/* Data transfers functions ***************************************************/ 
void I2C_SendData(I2C_TypeDef* I2Cx, uint8_t Data);
uint8_t I2C_ReceiveData(I2C_TypeDef* I2Cx);

/* PEC management functions ***************************************************/ 
void I2C_TransmitPEC(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_PECPositionConfig(I2C_TypeDef* I2Cx, uint16_t I2C_PECPosition);
void I2C_CalculatePEC(I2C_TypeDef* I2Cx, FunctionalState NewState);
uint8_t I2C_GetPEC(I2C_TypeDef* I2Cx);

/* DMA transfers management functions *****************************************/
void I2C_DMACmd(I2C_TypeDef* I2Cx, FunctionalState NewState);
void I2C_DMALastTransferCmd(I2C_TypeDef* I2Cx, FunctionalState NewState);

/* Interrupts, events and flags management functions **************************/
uint16_t I2C_ReadRegister(I2C_TypeDef* I2Cx, uint8_t I2C_Register);
void I2C_ITConfig(I2C_TypeDef* I2Cx, uint16_t I2C_IT, FunctionalState NewState);

/* 
 ===============================================================================
                          I2C State Monitoring Functions
 ===============================================================================
  This I2C driver provides three different ways for I2C state monitoring
  depending on the application requirements and constraints:
         
   
     1. Basic state monitoring (Using I2C_CheckEvent() function)
     -----------------------------------------------------------
        It compares the status registers (SR1 and SR2) content to a given event
        (can be the combination of one or more flags).
        It returns SUCCESS if the current status includes the given flags 
        and returns ERROR if one or more flags are missing in the current status.

          - When to use
             - This function is suitable for most applications as well as for startup 
               activity since the events are fully described in the product reference 
               manual (RM0090).
             - It is also suitable for users who need to define their own events.

          - Limitations
             - If an error occurs (ie. error flags are set besides to the monitored 
               flags), the I2C_CheckEvent() function may return SUCCESS despite 
               the communication hold or corrupted real state. 
               In this case, it is advised to use error interrupts to monitor 
               the error events and handle them in the interrupt IRQ handler.
         
     Note 
         For error management, it is advised to use the following functions:
           - I2C_ITConfig() to configure and enable the error interrupts (I2C_IT_ERR).
           - I2Cx_ER_IRQHandler() which is called when the error interrupt occurs.
             Where x is the peripheral instance (I2C1, I2C2 ...)
           - I2C_GetFlagStatus() or I2C_GetITStatus()  to be called into the 
             I2Cx_ER_IRQHandler() function in order to determine which error occurred.
           - I2C_ClearFlag() or I2C_ClearITPendingBit() and/or I2C_SoftwareResetCmd() 
             and/or I2C_GenerateStop() in order to clear the error flag and source 
             and return to correct  communication status.
             
 
     2. Advanced state monitoring (Using the function I2C_GetLastEvent())
     -------------------------------------------------------------------- 
        Using the function I2C_GetLastEvent() which returns the image of both status 
        registers in a single word (uint32_t) (Status Register 2 value is shifted left 
        by 16 bits and concatenated to Status Register 1).

          - When to use
             - This function is suitable for the same applications above but it 
               allows to overcome the mentioned limitation of I2C_GetFlagStatus() 
               function.
             - The returned value could be compared to events already defined in 
               this file or to custom values defined by user.
               This function is suitable when multiple flags are monitored at the 
               same time.
             - At the opposite of I2C_CheckEvent() function, this function allows 
               user to choose when an event is accepted (when all events flags are 
               set and no other flags are set or just when the needed flags are set 
               like I2C_CheckEvent() function.

          - Limitations
             - User may need to define his own events.
             - Same remark concerning the error management is applicable for this 
               function if user decides to check only regular communication flags 
               (and ignores error flags).
      
 
     3. Flag-based state monitoring (Using the function I2C_GetFlagStatus())
     -----------------------------------------------------------------------
     
      Using the function I2C_GetFlagStatus() which simply returns the status of 
      one single flag (ie. I2C_FLAG_RXNE ...). 

          - When to use
             - This function could be used for specific applications or in debug 
               phase.
             - It is suitable when only one flag checking is needed (most I2C 
               events are monitored through multiple flags).
          - Limitations: 
             - When calling this function, the Status register is accessed. 
               Some flags are cleared when the status register is accessed. 
               So checking the status of one Flag, may clear other ones.
             - Function may need to be called twice or more in order to monitor 
               one single event.           
 */

/*
 ===============================================================================
                          1. Basic state monitoring
 ===============================================================================
 */
ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT);
/*
 ===============================================================================
                          2. Advanced state monitoring
 ===============================================================================
 */
uint32_t I2C_GetLastEvent(I2C_TypeDef* I2Cx);
/*
 ===============================================================================
                          3. Flag-based state monitoring
 ===============================================================================
 */
FlagStatus I2C_GetFlagStatus(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);


void I2C_ClearFlag(I2C_TypeDef* I2Cx, uint32_t I2C_FLAG);
ITStatus I2C_GetITStatus(I2C_TypeDef* I2Cx, uint32_t I2C_IT);
void I2C_ClearITPendingBit(I2C_TypeDef* I2Cx, uint32_t I2C_IT);

#ifdef __cplusplus
}
#endif

#endif /*__STM32F4xx_I2C_H */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/