PIC

Pic 18F452: I2C Programming W/O interrupts

(Remember to set direction SCK/SDA ports)

Initialization

1. Enable Serial Bit = 1 (SSPEN=SSPCON<5>)
2. Synchronous Serial Port Mode Select Bits = 1011 (SSPM3-SSPM0=SSPCON<3:0>

Common Start

1. Start Enable Bit = 1 ( SEN=SSPCON2<0>)
2. DelayMs(1)
3. Load Address into SSPBUF
4. Test Buffer Full status bit (BF=SSPSTAT<0>)
   1. loop until buffer bit is cleared
5. Test acknowledge bit (ACK=SSPCON2<6>)
   1. if not acknowleded, abort

Write:

1. Load data byte into SSPBUF
2. Test Buffer Full status bif (BD=SSPSTAT<0>)
   1. Loop until bit is cleared
3. Test acknowledge bit (ACKSTAT=SSPCON<6>)
   1. if not acknowledged, abort

Read

1. Recieve Control Enable bit = 1 (RCEN=SSPCON<3>)
2. Test Buffer Full status bit (BF=SSPSTAT<0>)
3. Set acknowledge data=1 if data is recieved (ACKDT=SSPCON2<5>)
4. Enable Acknowlede bit=1 (ACKEN=SSPCON<4>)
5. Read data from SSPBUF

Common termination

1. Stop Enable bit=1 (PEN=SSPCON2<2>)

Repeated start

1. Repeated start enable bit =1 (RSEN=SSPCON2<1>)