Mistake 2: Flipped SCL & SDA

Mistake is spotted whereby the SDA and SCL lines documentation are correct but the PCB Design somehow got them flipped.

SCL (SPI0_CLK) should be at the longer side (the side with more pins)

Correct Pinout Arrangement (SDA at the shorter side, SCL at longer side)

Proof of wrong line connection: the lower one should be SCL instead

The fix: Physically swapping SDA and SCL

The fix part 1: break the PCB lines using drill.

The fix part 2: soldering thin wire to reconnect the correct linkage

 

Illustration of Correct and Wrong I2C Communication Patterns

The address 0011010x + ACK = 9-bit / clock.

Correct with acknowledge

Wrong: No response