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PCD
i2c_isr_state( )
Syntax:
state = i 2 c_isr_state();
state = i 2 c_isr_state( stream );
Parameters: None
Returns:
Function:
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; i 2 c_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 i 2 c_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: Devices with i 2 c hardware
Requires:
Examples:
Example
Files:
Also See:
#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, i 2 c_write, i 2 c_read, #USE
I2C, I2C Overview
i2c_poll( )
Syntax:
i 2 c_poll()
i 2 c_poll( stream )
186
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