From e6bffe23c87a9f6de8abdec747600f674b9cab62 Mon Sep 17 00:00:00 2001
From: William Harrington <kb0iic@berzerkula.org>
Date: Sat, 27 Jul 2019 22:16:27 -0500
Subject: Copy project files into repo

---
 i2c.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100755 i2c.c

(limited to 'i2c.c')

diff --git a/i2c.c b/i2c.c
new file mode 100755
index 0000000..5b3b707
--- /dev/null
+++ b/i2c.c
@@ -0,0 +1,62 @@
+
+//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
+  SSPSTAT = 0b00000000;    //pg83/234
+}
+
+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;
+}
\ No newline at end of file
-- 
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