Lab 4 Tasks

Requested Functions

• int mouse_enable_data_reporting(void)
• int mouse_disable_data_reporting(void)
• int mouse_process_byte(uint8_t byte)
• int mouse_get_packet(mouse_packet_t *packet)

Guided Gaps

• Decide how many retries command writes should attempt.
• Validate ACK responses.
• Store packet bytes until all three are available.
• Drop bytes until the synchronization bit identifies byte 0.
• Convert signed movement into C integers.

IMPORTANT

Do not assume the first byte you receive is packet byte 0. Robust code must resynchronize when a stream starts mid-packet.

Common Mistakes

• Forgetting that X and Y have separate sign bits.
• Treating overflow bits as movement.
• Returning a packet before all three bytes arrived.
• Leaving data reporting enabled after a test.

Next: checks and references.