CCS C Compiler Manual PCB / PCM / PCH

Also See:
I2C_POLL( ), i2c_speed( ), I2C_SlaveAddr( ), I2C_ISR_STATE(_)
,I2C_WRITE( ),
I2C_READ( ), _USE_I2C( ), I2C( )
i2c_isr_state( )
Syntax:
Parameters:
Returns:
Function:
state = i2c_isr_state();
state = i2c_isr_state(stream);
None
state is an 8 bit int
0 - Address match received with R/W bit clear, perform i2c_read( ) to read
the I2C address.
1-0x7F - Master has written data; i2c_read() will immediately return the
data
0x80 - Address match received with R/W bit set; perform i2c_read( ) to
read the I2C address, and use i2c_write( ) to pre-load the transmit buffer
for the next transaction (next I2C read performed by master will read this
byte).
0x81-0xFF - Transmission completed and acknowledged; respond with
i2c_write() to pre-load the transmit buffer for the next transation (the next
I2C read performed by master will read this byte).
Returns the state of I2C communications in I2C slave mode after an SSP
interrupt. The return value increments with each byte received or sent.
If 0x00 or 0x80 is returned, an i2C_read( ) needs to be performed to read
the I2C address that was sent (it will match the address configured by
#USE I2C so this value can be ignored)
Availability:
Requires:
Examples:
Example Files:
Also See:
Devices with i2c hardware
#USE I2C
#INT_SSP
void i2c_isr() {
state = i2c_isr_state();
if(state== 0 ) i2c_read();
i@c_read();
if(state == 0x80)
i2c_read(2);
if(state >= 0x80)
i2c_write(send_buffer[state - 0x80]);
else if(state > 0)
rcv_buffer[state - 1] = i2c_read();
}
ex_slave.c
i2c_poll, i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_write, i2c_read,
#USE I2C, I2C Overview
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