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//PIN 18 -> RC3 -> SCL
//PIN 23 -> RC4 ->SDA
#include "i2c.h"
#include "conf.h"
void I2C_Master_Init(const unsigned long freq_K) //Begin IIC as master
{
TRISC3 = 1;
TRISC4 = 1; //Set SDA and SCL pins as input pins
SSPCON = 0b00101000; //pg84/234
SSPCON2 = 0b00000000; //pg85/234
//SSPADD = (_XTAL_FREQ/(4*freq_K*100))-1; //Setting Clock Speed pg99/234
SSPADD = 49;
//SSPSTAT: SMP:CKE:D/!A:P:S:R/!W/:U:BF *U unimplemented read as 0
SMP = 1; // Disable slew rate
CKP = 0; // Data transmitted on rising edge of SCK
}
void I2C_Master_Wait() {
while ((SSPCON2 & 0b00011111) || (SSPSTAT & 0b00000100)); //check the bis on registers to make sure the IIC is not in progress
}
void I2C_Master_Start() {
I2C_Master_Wait(); //Hold the program if I2C is busy
SEN = 1; //Begin IIC pg85/234
}
void I2C_Master_Repeated_Start() {
I2C_Master_Wait();
RSEN = 1; //Initiate repeated start condition
}
void I2C_Master_Stop() {
I2C_Master_Wait(); //Hold the program is I2C is busy
PEN = 1; //End IIC pg85/234
}
void I2C_Master_Write(unsigned data) {
I2C_Master_Wait(); //Hold the program is I2C is busy
SSPBUF = data; //pg82/234
}
unsigned short I2C_Master_Read(unsigned short ack) {
unsigned short incoming;
I2C_Master_Wait();
RCEN = 1;
I2C_Master_Wait();
incoming = SSPBUF; //get the data saved in SSPBUF
I2C_Master_Wait();
ACKDT = (ack) ? 0 : 1; //check if ack bit received
ACKEN = 1; //pg 85/234
return incoming;
}
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