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In the EZUSB_WriteI2C and EZUSB_ReadI2C functions please pass the 7-bit slave address (0x73) as the first parameter. The functions will take care of shifting the address bits and adding the read/write bit as the LSB. Please implement this and check if it returns the correct data.
Also, please provide the I2C slave datasheet and also the the data currently being read from the slave device.