fx2i2c.h

The fx2i2c.h header contains I2C and EEPROM routines for the Cypress FX2 series. When using this header, the fx2 library must be linked in.

Reference

Functions

bool i2c_wait(bool need_ack)

This function waits until the current I2C transfer terminates, or until i2c_cancel is set. In the latter case, i2c_cancel is cleared. Returns false in case of bus contention, or if need_ack was set and the transfer was not acknowledged, true otherwise. The BERR bit in the I2CS register should be checked if false is returned.

Note that i2c_wait is not meant to be used directly; it is documented to explain the behavior of i2c_start, i2c_write and i2c_read.

bool i2c_start(uint8_t chip)

This function generates a start condition and writes the address chip to the bus. See i2c_wait for description of return value.

bool i2c_stop(void)

This function generates a stop condition.

bool i2c_write(const uint8_t *buf, uint16_t len)

This function writes len bytes from buf to the I2C bus. See i2c_wait for description of return value.

bool i2c_read(uint8_t *buf, uint16_t len)

This function reads len bytes to buf from the I2C bus, responds with NAK to the last byte read, and generates a stop condition. See i2c_wait for description of return value.

Variables

volatile bool i2c_cancel

A flag that terminates the current I2C transfer.