Basic PIC-C I2C Communication

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Presentation transcript:

Basic PIC-C I2C Communication Arnan (Roger) Sipitakiat Department of Computer Engineering, Chiang Mai University, Thailand

I2C Basics I2C is a Bus. Serial is point-to-point Master and Slave pair Master must start the communication Slave can only respond Slave has a 8-bit address Bit 0 is reserved for direction control

Basic I2C Bus Setup SDA SCL MASTER SLAVE 1 SLAVE 2 5V Pull-up Resistors SDA SCL

i2C Commands in PIC-C Master Only Slave Only Master & Slave I2c_start() I2c_stop() Slave Only I2c_isr_state() Master & Slave I2c_read() I2c_write()

Sending 1 Byte to Slave MASTER SLAVE I2c_start() I2c_write(slave addr | 0) I2c_write(registerAddress) I2c_write(value) I2c_stop() Address Content 1 2 3 4 5 6 7

Reading 2 bytes from slave MASTER SLAVE I2c_start() I2c_write(slave addr | 0) I2c_write(registerAddress) I2c_write(slave addr | 1) Value1 = I2c_read() Value2 = I2c_read(0) I2c_stop() Address Content 1 2 3 4 5 6 7

Controlling the Display Module Show 16 Bit Number 0xB0 0x02 Number Hi Number Low (Slave Address) (Register Address) Clear Screen 0xB0 0x06 (Slave Address) (Register Address)

Example Program // i2c1 - Master #use i2c(MASTER, I2C1) // Show the number 100 on the screen I2c_start(); I2c_write(0xB0 | 0); // display module address I2c_write(2); // show number command I2c_write(0); I2c_wirte(100); I2c_stop();