I2C with PIC16F18323

DeltaElectronics
Another silly question... but, by default, it seems me that PORTC is digital, not analog.

 
void I2C_Master_Init(const unsigned long speed) {
 SSP1CON1 = 0b00101000;
 SSP1CON2 = 0;
 SSP1CON3 = 0b01100000;
 SSP1DATPPS = 0x13;
 SSP1CLKPPS = 0x12;
 INTCONbits.GIE = 1;
 SSP1ADD = (_XTAL_FREQ/(4*speed))-1;
 SSP1STAT = 0;
 ANSC0 = 0;
 ANSC1 = 0;
 TRISC0 = 1; //SCL
 TRISC1 = 1; //SDA
}
 
 
 
_Bool I2C_Master_Write(unsigned d) {
 I2C_Master_Wait();
 SSP1BUF = d; //Write data to SSPBUF
 SSP1IF = 0;
 while (!SSP1IF);
 return ACKSTAT;
}
 

 
while (!SSP1IF);
 

//file i2c.h
#include <xc.h>
#include "config.h"

void I2C_Master_Init(const unsigned long speed) {
 SSP1CON1 = 0x28;
 SSP1CON1bits.SSPEN=1;
 SSP1CON2 = 0;
 SSP1CON3 = 0b01100000;
 INTCONbits.GIE = 1;
 PIR1bits.SSP1IF = 1;
 SSP1CON3bits.SCIE = 1;
 SSP1CON3bits.PCIE = 1;

 SSP1ADD = (_XTAL_FREQ/(4*speed))-1;
SSP1STAT = 0;
 ANSELC = 0x00;
 TRISC0 = 1; //SCL
 TRISC1 = 1; //SDA
}
void I2C_Master_Wait() {
 while ((SSP1STAT & 0x04) || (SSP1CON2 & 0x1F)); //Transmit is in progress
}

void I2C_Master_Start() {
 I2C_Master_Wait();
 SEN = 1;
 while (SEN);
}
void I2C_Master_Repeated_Start() {
 I2C_Master_Start();
}
void I2C_Master_Stop() {
 I2C_Master_Wait();
 PEN = 1;
 while(PEN);
}
_Bool I2C_Master_Write(unsigned d) {
 I2C_Master_Wait();
 SSP1IF=0;
SSP1BUF = d; //Write data to SSPBUF
 while (!SSP1IF);
 return ACKSTAT;
}
unsigned short I2C_Master_Read(unsigned short a) {
 unsigned short temp;
 I2C_Master_Wait();
 RCEN = 1;
 I2C_Master_Wait();
 temp = SSPBUF; //Read data from SSPBUF
 I2C_Master_Wait();
 ACKDT = (a)?0:1; //Acknowledge bit
 ACKEN = 1; //Acknowledge sequence
 return temp; 
}
/code]and 

/file main.c
#include <xc.h>
#include "config.h"
#include "i2c.h"
void main(void) {
 OSCCON1 = 0x60;;
 OSCFRQbits.HFFRQ = 0b011;
 TRISC4 =0;
 TRISC3 =0;
 
 I2C_Master_Init(100000);
 _Bool green = 1;
 while(1) {
__delay_ms(500);
 if (green) {
 LATCbits.LATC4 = 1;
 LATCbits.LATC3 = 0;
 green = 0;
 } else {
 LATCbits.LATC4 = 0;
 LATCbits.LATC3 = 1;
 green = 1; 
 } 
 I2C_Master_Start();
 I2C_Master_Write(0x3C);
 I2C_Master_Stop();
 }
}
but it continue stops at the following instruction


while (!SSP1IF);
  and  olnly a LED is on.
If instaeas I commemt the infinete loop, two led regularly blinks, at oscilloscope display I see only two plain line.
                
 post edited by DeltaElectronics - 2019/06/15 11:30:25
                
            

 
void I2C_Master_Init(const unsigned long speed) {
 SSP1CON1 = 0x28;
 SSP1CON1bits.SSPEN=1;
 SSP1CON2 = 0;
 SSP1CON3 = 0b01100000;
 SSP1DATPPS = 0x13;
 SSP1CLKPPS = 0x12;
 INTCONbits.GIE = 1;
 PIR1bits.SSP1IF = 1;
 SSP1CON3bits.SCIE = 1;
 SSP1CON3bits.PCIE = 1;
 
 RC0PPSbits.RC0PPS = 0x19; //RC0->SDA1
 RC1PPSbits.RC1PPS = 0x18; //RC1->SCL1*/
 SSP1DATPPS = 0x11;
 SSP1CLKPPS = 0x10;
 SSP1ADD = (_XTAL_FREQ/(4*speed))-1;
 
SSP1STAT = 0;
 ANSELC = 0x00;
 TRISC0 = 1; //SCL
 TRISC1 = 1; //SDA
}
 

 RC2PPSbits.RC2PPS = 0x19; //RC2->SDA1   <--- 0b11001: SDA output to RC2
 RC3PPSbits.R31PPS = 0x18; //RC3->SCL1*/ <--- 0b11000: SCL output to RC3
SSP1DATPPS = 0b10010;        //            <--- 0b10001: RC2 to SDA input
SSP1CLKPPS = 0b10011;        //            <--- 0b10000: RC3 to SCK input

[/code]
configures SDA channel on RC2 and CLK one on RC3; right ?
But in reading from table 2 PIN Allocation Table, it seems that only RC0 can be dedicated to SDA channel and RC1 to CLK. It puzzles me a lot !!!Smile: 

                
                
            

DeltaElectronics
...
Another silly question: As it seems me to understand reading from DS and you comments, it seems me there is the possibility to choose fon whic MCU pins put I2C clk and sda; i.e. for example this chunk of code
 ...
configures SDA channel on RC2 and CLK one on RC3; right ?

But in reading from table 2 PIN Allocation Table, it seems that only RC0 can be dedicated to SDA channel and RC1 to CLK. It puzzles me a lot !!!Smile: