In oc_i2c_master.h there is a following definition: #define OC_I2C_ACK (1<<3) / Acknowledge from slave / / 1 - ACK / / 0 - NACK /
But according to the specification it must be 1 = NACK, 0 = ACK
The same is about #define OC_I2C_RXACK (1<<7)