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FUNCTIONAL OVERVIEW
I2C
I2C? is a popular two -wire communication protocol developed by Phillips. Many PIC
microcontrollers support hardware- based I2C?. CCS offers support for the hardware -based
I2C? and a software - based master I2C? device. (For more information on the h ardware-based
I2C module, please consult the datasheet for you target device; not all PICs support I2C?.)
Relevant Functions:
i2c_start()
i2c_write(data)
i2c_read()
i2c_stop()
i2c_poll()
Issues a start command when in the I2C master mode.
Sends a single byte over the I2C interface.
Reads a byte over the I2C interface.
Issues a stop command when in the I2C master mode.
Returns a TRUE if the hardware has received a byte in the
buffer.
Relevant Preprocessor:
#USE I2C
Configures the compiler to s upport I2C? to your
specifications.
Relevant Interrupts:
#INT_SSP
#INT_BUSCOL
#INT_I2C
#INT_BUSCOL2
#INT_SSP2
Relevant Include Files:
None, all functions built-in
Relevant getenv() Parameters:
I2C_SLAVE
I2C_MASTER
Example Code:
#define Device_SDA PIN_C3
#define Device_SLC PIN_C4
#use i 2 c(master,
I2C or SPI activity
Bus Collision
I2C Interrupt (Only on 14000)
Bus Collision (Only supported on some PIC18's)
I2C or SPI activity (Only supported on some PIC18's)
Returns a 1 if the device has I2C slave H/W
Returns a 1 if the device has a I2C master H/W
// Pin defines
// Configure Device as Master
sda=Device_SDA,
scl=Device_SCL)
..
..
30
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