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// Setup the PIC to operate as a master.
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// Setup the PIC to operate as a master.
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void I2C_Configure_Master(unsigned char speed) {
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void I2C_Configure_Master(unsigned char speed) {
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    i2c_data_p->operating_mode = I2C_MODE_MASTER;
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    i2c_data_p->operating_mode = I2C_MODE_MASTER;
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    TRISCbits.TRISC3 = 1;
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    I2C_CLK_TRIS = 1;
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    TRISCbits.TRISC4 = 1;
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    I2C_DAT_TRIS = 1;
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    SSPSTAT = 0x0;
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    SSPSTAT = 0x0;
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    SSPCON1 = 0x0;
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    SSPCON1 = 0x0;
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    SSPCON2 = 0x0;
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    SSPCON2 = 0x0;
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    SSPCON1bits.SSPM = 0x8; // I2C Master Mode
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    SSPCON1bits.SSPM = 0x8; // I2C Master Mode
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// Setup the PIC to operate as a slave. The address must not include the R/W bit
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// Setup the PIC to operate as a slave. The address must not include the R/W bit
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void I2C_Configure_Slave(unsigned char addr) {
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void I2C_Configure_Slave(unsigned char addr) {
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    i2c_data_p->operating_mode = I2C_MODE_SLAVE;
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    i2c_data_p->operating_mode = I2C_MODE_SLAVE;
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    // Ensure the two lines are set for input (we are a slave)
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    // Ensure the two lines are set for input (we are a slave)
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    TRISCbits.TRISC3 = 1;
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    I2C_CLK_TRIS = 1;
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    TRISCbits.TRISC4 = 1;
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    I2C_DAT_TRIS = 1;
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    SSPADD = addr << 1;     // Set the slave address
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    SSPADD = addr << 1;     // Set the slave address
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    SSPSTAT = 0x0;
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    SSPSTAT = 0x0;
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    SSPCON1 = 0x0;
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    SSPCON1 = 0x0;