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Ask STM32F103 and AT24Cxx use IIC communication problem.

Hardware design
December 03, 2020 by Beatriz 1687

<div>What is the function of (addr 256)<<1? How to achieve it?


What is the function of (addr/256)<<1? How to achieve it? <div>What is the function of (addr 256)<<1? How to achieve it?

Is adding up the parameters of this statement equal to sending the two parameters separately?

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Gwyneth Posted on December 3, 2020

(addr/256)<<1

Equivalent to

(addr/256) * 2

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Sian Posted on December 3, 2020

The following is the meaning of "page turning", because 24c4-24c16 are single-byte addressing. When the address exceeds 1 byte (255), a page needs to be replaced. The ones above 24c32 are double-byte addressing, so there is no need to do this.

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Katerina Posted on December 3, 2020

Very simple, because the address of the IIC is the upper 7 bits, and the lowest bit of the address sent is the R/W bit.

When using the device address + data address to send, the data address is bound to move one bit to the left.

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Sammy Posted on December 3, 2020

Isn't 0xA0 the device address? Doesn't it turn to another AT24Cxx if it turns to 0xA1?

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