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Built-in Functions
Parameters: stream (optional)- specify the stream defined in #USE I 2 C
Returns:
Function:
Availability:
Requires:
Examples:
Example
Files:
Also See:
1 (TRUE) or 0 (FALSE)
The I2C_POLL() function should only be used when the built-in SSP is used. This
function returns TRUE if the hardware has a received byte in the buffer. When a
TRUE is returned, a call to I2C_READ() will immediately return the byte that was
received.
Devices with built in I 2 C
#USE I2C
if(i2c-poll())
buffer [index]=i2c-read();//read data
None
i2c_speed, i2c_start, i2c_stop, i2c_slaveaddr, i2c_isr_state, i 2 c_write, i 2 c_read,
#USE I2C, I2C Overview
i2c_read( )
Syntax:
data = i 2 c_read();
data = i 2 c_read(ack);
data = i 2 c_read(stream, ack);
Parameters: ack -Optional, defaults to 1.
0 indicates do not ack.
1 indicates to ack.
2 slave only, indicates to not release clock at end of read. Use when i2c_isr_state
()
returns 0x80.
stream - specify the stream defined in #USE I2C
Returns:
Function:
data - 8 bit int
Reads a byte over the I2C interface. In master mode this function will generate the
clock and in slave mode it will wait for the clock. There is no timeout for the slave,
use i2c_poll() to prevent a lockup. Use restart_wdt() in the #USE I2C to strobe the
watch-dog timer in the slave mode while waiting.
Availability: All devices.
Requires:
#USE I2C
187
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