Information processing apparatus and image processing apparatus that perform transmission and reception of data, and method of controlling information processing apparatus

An image processing apparatus comprising:

• a data transmitting module which sets a sequence number to a data block, and transmits the data block to which the sequence number has been set;
• and
• a data receiving module which stores an expected value of the sequence number having been set to the data block received from the data transmitting module, receives, from the data transmitting module, the data block to which the sequence number has been set by the data transmitting module, and determines whether the data block received from the data transmitting module is correct or wrong based on at least comparison between a value of the sequence number having been set to the received data block and the stored expected value of the sequence number,
• wherein the data transmitting module can retransmit, to the data receiving module, the same data block to which the sequence number having the same value has been set, and
• wherein the data receiving module updates the stored expected value of the sequence number to a next expected value of the sequence number having been set to the next data block, if determining, based on the stored expected value of the sequence number, that at least two data blocks having been received from the data transmitting module are wrong respectively.

A method of controlling an information processing apparatus, comprising:

• transmitting a data block including a predetermined amount of data and a sequence number;
• receiving the transmitted data block;
• determining whether the data block is correctly received, based on a result of detection of an error in data included in the received data block and a result of comparison between a value of a counter stored in a storage unit and a value of the sequence number included in the received data block;
• counting up the value of the counter stored in the storage unit by a predetermined value, according to said determining;
• and
• counting up the value of the counter stored in the storage unit by a predetermined value, in a case where it is determined by said determining a predetermined number of times that the data block is not correctly received.