I2C Library

I²C Library

The I²C full master I²C module is available with a number of the MCU models. The mikroC PRO for FT90x provides a library which supports the master I²C mode.

Important :

I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5.
Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.
Library routine prototypes may vary from family to family, so please pay attention to the desired routine section.

Generic Routines

I2CM_Soft_Reset
I2CM_Set_Slave_Address
I2CM_Read
I2CM_Read_10Bit
I2CM_Read_Bytes
I2CM_Write
I2CM_Write_10Bit
I2CM_Write_Bytes

I2CM1_Init

Prototype

void I2CM1_Init(char speedMode, char swap);

Description

This function configures and initializes the I²C module with the standard user-defined settings.

Parameters

speedMode: desired I²C bus speed :

Value	Description
_I2CM_SPEED_MODE_STANDARD	Standard Speed Mode (up to 100kb/s).
_I2CM_SPEED_MODE_FAST	Fast mode (up to 400kb/s).
_I2CM_SPEED_MODE_FAST_PLUS	Fast-plus mode (up to 1Mb/s).
_I2CM_SPEED_MODE_HIGH	High-speed mode (up to 3.4Mb/s).

swap:

Value	Description
_I2CM_SWAP_ENABLE	Enable I²C Master and I²C Slave pad position swapping.
_I2CM_SWAP_DISABLE	Disable I²C Master and I²C Slave pad position swapping.

Returns

Nothing.

Requires

Routine requires MCU with the I²C module.

Example

// Initialize the I2C module with the standard bitrate, swapping disabled
I2CM1_Init(_I2CM_SPEED_MODE_STANDARD, _I2CM_SWAP_DISABLE);

Notes

I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5.
Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Soft_Reset

Prototype	void I2CM1_Soft_Reset();
Description	This function resets the whole I²C Master controller.
Parameters	None.
Returns	Nothing.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	// Reset I2C Master I2CM1_Soft_Reset();
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Set_Slave_Address

Prototype	void I2CM1_Set_Slave_Address(char slaveAddress);
Description	Sets the address which the I²C Master will place on the bus, i.e. Slave address.
Parameters	`slaveAddress:` I²C slave address.
Returns	Nothing.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	// Set slave address I2CM1_Set_Slave_Address(0x0A);
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Read

Prototype	char I2CM1_Read(char *dataIn);
Description	Receives a single byte from the I²C bus.
Parameters	`dataIn:` pointer to variable that will store the received byte.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Read(&bufferIn); // read bytes and store to bufferIn.
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Read_10Bit

Prototype	char I2CM1_Read_10Bit(char dataIn, unsigned int* address10Bit);
Description	Receives a single byte from the I²C bus.
Parameters	`dat:` pointer to variable that will store the received data.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Read_10Bit(&bufferIn, address); // read bytes and store to bufferIn.
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Read_Bytes

Prototype	char I2CM1_Read_Bytes(char bufferIn, unsigned int* numBytesToReceive);
Description	Receives multiple bytes from the I²C bus.
Parameters	`bufferIn:` pointer to a buffer that will store the received bytes. `numBytesToReceive:` number of bytes to be received.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Read_Bytes(&bufferIn, 16); // read 16 bytes and store it to bufferIn.
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Write

Prototype	char I2CM1_Write(char dataOut);
Description	Routine sends a single byte via the I²C bus.
Parameters	`dataOut:` byte to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Write(dataOut); // write a byte
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Write_10Bit

Prototype	char I2CM1_Write_10Bit(char dataOut, unsigned int address10Bit);
Description	Routine sends a single byte via the I²C bus.
Parameters	`dataOut:` byte to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Write_10Bit(&bufferOut, address);
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM1_Write_Bytes

Prototype	char I2CM1_Write_Bytes(char bufferOut, unsigned int* numBytesToSend);
Description	Routine sends multiple bytes via the I²C bus.
Parameters	`bufferOut:` pointer to a buffer that holds bytes for sending. `numBytesToReceive:` number of bytes to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM1_Write_Bytes(&bufferOut, 16);
Notes	I²C library routines require you to specify the module you want to use. To select the desired I²C module, simply change the letter n in the routine prototype for a number from 0 to 5. Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM_Set_Active

Prototype	void I2CM_Set_Active( void (softReset_Ptr)(void), void* (setSlaveAddress_Ptr)(char* slaveAddress), char (write_Ptr)(char* dataOut), char (write10Bit_Ptr)(char* dataOut, unsigned int address10Bit), char (writeBytes_Ptr)(char* buffer, unsigned int* numBytesToSend), char (read_Ptr)(char* dataIn), char* (receiveByte10Bit_Ptr)(char* dataIn, unsigned int* address10Bit), char (readBytes_Ptr)(char* buffer, unsigned int* numBytesToReceive) );
Description	Sets the active I²C module which will be used by the I²C routines.
Parameters	`softReset_Ptr:` I2CM1_Soft_Reset handler `setSlaveAddress_Ptr:` I2CM1_Set_Slave_Address handler `write_Ptr:` I2CM1_Write handler `write10Bit_Ptr:` I2CM1_Write_10Bit handler `writeBytes_Ptr:` I2CM1_Write_Bytes handler `read_Ptr:` I2CM1_Read handler `receiveByte10Bit_Ptr:` I2CM1_Read_10Bit handler `readBytes_Ptr:` I2CM1_Read_Bytes handler
Returns	Nothing.
Requires	Used I²C module must be initialized before using this function. See the I2CM1_Init routine.
Example	I2CM_Set_Active(&I2CM1_Soft_Reset, &I2CM1_Set_Slave_Address, &I2CM1_Write, &I2CM1_Write_10Bit, &I2CM1_Write_Bytes, &I2CM1_Read, &I2CM1_Read_10Bit, &I2CM1_Read_Bytes); // Sets the I2CM1 module active
Notes	Number of I²C modules per MCU differs from chip to chip. Please, read the appropriate datasheet before utilizing this library.

I2CM_Soft_Reset

Prototype	void I2CM_Soft_Reset();
Description	This function resets the whole I²C Master controller. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	None.
Returns	Nothing.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	// Reset I2C Master I2CM_Soft_Reset();
Notes	None.

I2CM_Set_Slave_Address

Prototype	void I2CM_Set_Slave_Address(char slaveAddress);
Description	Sets the address which the I²C Master will place on the bus, i.e. Slave address. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`slaveAddress:` I²C slave address.
Returns	Nothing.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	// Set slave address I2CM_Set_Slave_Address(0x0A);
Notes	None.

I2CM_Read

Prototype	char I2CM_Read(char *dataIn); This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Description	Receives a single byte from the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`dataIn:` pointer to variable that will store the received byte.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Read(&dataIn);
Notes	None.

I2CM_Read_10Bit

Prototype	char I2CM_Read_10Bit(char dataIn, unsigned int* address10Bit);
Description	Receives a single byte from the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`dat:` pointer to variable that will store the received data.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Read_10Bit(@bufferIn, address); // read bytes and store to bufferIn.
Notes	None.

I2CM_Read_Bytes

Prototype	char I2CM_Read_Bytes(char bufferIn, unsigned int* numBytesToReceive);
Description	Receives multiple bytes from the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`bufferIn:` pointer to a buffer that will store the received bytes. `numBytesToReceive:` number of bytes to be received.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Read_Bytes(&bufferIn, 16); // read 16 bytes and store it to bufferIn.
Notes	None.

I2CM_Write

Prototype	char I2CM_Write(char dataOut);
Description	Routine sends a single byte via the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`dataOut:` byte to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Write(dataOut); // write a byte
Notes	None.

I2CM_Write_10Bit

Prototype	char I2CM_Write_10Bit(char dataOut, unsigned int address10Bit);
Description	Routine sends a single byte via the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`dataOut:` byte to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Write_10Bit(&bufferOut, address);
Notes	None.

I2CM_Write_Bytes

Prototype	char I2CM_Write_Bytes(char bufferOut, unsigned int* numBytesToSend);
Description	Routine sends multiple bytes via the I²C bus. This is a generic routine which uses the active I²C module previously activated by the I2CM_Set_Active routine.
Parameters	`bufferOut:` pointer to a buffer that holds bytes for sending. `numBytesToReceive:` number of bytes to be sent.
Returns	`_I2CM_STATUS_OK` if there were no errors. `_I2CM_STATUS_ERROR` if an error occured during transmission. `_I2CM_STATUS_ARB_LOST` if arbitration was lost.
Requires	Routine requires MCU with the I²C module. Used I²C module must be initialized before using this function. See I2CM1_Init routine.
Example	I2CM_Write_Bytes(&bufferOut, 16);
Notes	None.

Want more examples and libraries?
Find them on