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#ifndef _I2C_H_ |
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#define _I2C_H_ |
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|
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/* |
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* SDA (data) and SCL (clock) bits |
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* |
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* Special note!!! |
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* |
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* If the clock and data lines are in the same port, you will need |
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* to beware of the Read/Modify/Write issue in the PIC - since |
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* a bit set or clear on any one bit in a port will read and write |
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* back all other bits, any bits configured as input which |
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*/ |
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|
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/* Uncomment the next line to use the PIC's SSP Module*/ |
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#define I2C_MODULE 1 |
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|
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#ifdef I2C_MODULE |
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/* I2C module uses PORT C */ |
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#define SCL RC3 /* clock on port C bit 2 */ |
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#define SCL_DIR TRISC3 |
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#define SDA RC4 /* data on port C bit 1 */ |
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#define SDA_DIR TRISC4 |
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#define I2CTRIS TRISC |
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#define MASTER_MODE 0B1011 /* I2C firmware controlled Master Mode (slave idle) */ |
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#define SSPMode(val) SSPCON1 &=0xF0; SSPCON1 |=(val & 0xf) |
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|
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#else |
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/* Change port as required - defaults to port b */ |
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#define SCL RB2 /* clock on port B bit 2 */ |
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#define SCL_DIR TRISB2 |
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|
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#define SDA RB1 /* data on port B bit 1 */ |
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#define SDA_DIR TRISB1 |
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#define I2CTRIS TRISB |
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|
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#endif |
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|
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#define M_SDA_INP 0x02 |
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#define M_SDA_OUT 0xFD |
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#define M_SCL_INP 0x04 |
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#define M_SCL_OUT 0xFB |
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|
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#define I2C_INPUT 1 /* data direction input */ |
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#define I2C_OUTPUT 0 /* data direction output */ |
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#define I2C_READ 0x01 /* read bit used with address */ |
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#define I2C_WRITE 0x00 /* write bit used with address */ |
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|
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#define FALSE 0 |
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#define TRUE !FALSE |
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|
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#define I2C_ERROR (-1) |
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#define I2C_LAST FALSE /* SendAck: no more bytes to send */ |
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#define I2C_MORE TRUE /* SendAck: more bytes to send */ |
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#define i2c_Start() i2c_Restart() |
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#define i2c_WriteTo(address) i2c_Open((address), I2C_WRITE) |
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#define i2c_ReadFrom(address) i2c_Open((address), I2C_READ) |
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|
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#ifdef I2C_MODULE |
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#define SCL_HIGH() SCL_DIR = I2C_INPUT |
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#define SCL_LOW() SCL_DIR = I2C_OUTPUT |
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#define SDA_HIGH() SDA_DIR = I2C_INPUT |
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#define SDA_LOW() SDA_DIR = I2C_OUTPUT |
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#else |
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#define SCL_HIGH() SCL = 1; SCL_DIR = I2C_OUTPUT |
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#define SCL_LOW() SCL = 0; SCL_DIR = I2C_OUTPUT |
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#define SDA_HIGH() SDA = 1; SDA_DIR = I2C_OUTPUT |
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#define SDA_LOW() SDA = 0; SDA_DIR = I2C_OUTPUT |
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#endif |
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|
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/* |
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* Timings for the i2c bus. Times are rounded up to the nearest |
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* micro second. |
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*/ |
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|
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#define I2C_TM_BUS_FREE 5 |
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#define I2C_TM_START_SU 5 |
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#define I2C_TM_START_HD 4 |
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#define I2C_TM_SCL_LOW 5 |
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#define I2C_TM_SCL_HIGH 4 |
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#define I2C_TM_DATA_SU 1 |
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#define I2C_TM_DATA_HD 0 |
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#define I2C_TM_SCL_TO_DATA 4 /* SCL low to data valid */ |
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#define I2C_TM_STOP_SU 4 |
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#define I2C_TM_SCL_TMO 10 /* clock time out */ |
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|
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extern signed char i2c_ReadAcknowledge(void); |
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extern unsigned char i2c_SendAddress(unsigned char, unsigned char); |
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extern unsigned char i2c_SendByte(unsigned char); |
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extern int i2c_ReadByte(void); |
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extern void i2c_Restart(void); |
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extern void i2c_Stop(void); |
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extern void i2c_SendAcknowledge(unsigned char); |
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extern signed char i2c_PutByte(unsigned char); |
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extern int i2c_GetByte(unsigned char); |
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extern unsigned char i2c_Open(unsigned char, unsigned char); |
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extern unsigned char i2c_GetString(unsigned char *, unsigned char); |
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extern int i2c_PutString(const unsigned char *, unsigned char); |
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extern unsigned char i2c_WaitForSCL(void); |
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extern void i2c_Free(void); |
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#endif /* _I2C_H_ */ |
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