PCA9555: Question about PCA9555

yoonju hwang1

Part Number: PCA9555

Hello!

I have some question about PCA9555

Implemented GPIO expansion I/F using PCA9555D.

(I2C connection was made between STM32 MCU and PCA9555D.)

Excuse me, but I would like to ask if there is a sample source code for driving the PCA9555D.

0 Clemens Ladisch over 2 years ago

Guru 320590 points

There are no special requirements for the PCA9555's registers.

You can find the Linux driver here: github.com/torvalds/linux/blob/master/drivers/gpio/gpio-pca953x.c But it's probably not helpful; I guess your problem is how to access the STM32's I²C hardware, which is not made by TI.

0 Tyler Townsend over 2 years ago

Yoonju,

Please let me know if you have any more questions.

Regards,

Tyler

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