CCS C Compiler Manual PCB / PCM / PCH

Built-in Functions
i2c_write( )
Syntax:
Parameters:
Returns:
Function:
Availability:
Requires:
Examples:
i2c_write (data)
i2c_write (stream, data)
data is an 8 bit int
stream - specify the stream defined in #USE I2C
This function returns the ACK Bit.
0 means ACK, 1 means NO ACK, 2 means there was a collision if in
Multi_Master Mode.
This does not return an ACK if using i2c in slave mode.
Sends a single byte over the I2C interface. In master mode this function will
generate a clock with the data and in slave mode it will wait for the clock from
the master. No automatic timeout is provided in this function. This function
returns the ACK bit. The LSB of the first write after a start determines the
direction of data transfer (0 is master to slave). Note that specific I2C protocol
depends on the slave device.
All devices.
#USE I2C
long cmd;
...
i2c_start();
// Start condition
i2c_write(0xa0);// Device address
i2c_write(cmd);// Low byte of command
i2c_write(cmd>>8);// High byte of command
i2c_stop(); // Stop condition
Example Files: ex_extee.c with 2416.c
Also See:
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i2c_read,
#USE I2C, I2C Overview
input( )
Syntax:
Parameters:
value = input (pin)
Pin to read. Pins are defined in the devices .h file. The actual value is a bit
address. For example, port a (byte 5 ) bit 3 would have a value of 5*8+3 or 43
. This is defined as follows: #define PIN_A3 43 .
The PIN could also be a variable. The variable must have a value equal to
one of the constants (like PIN_A1) to work properly. The tristate register is
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