Re:Raspberry Pi Pico Hack Unlocks Two Extra “Hidden” GPIO Pins
by joezydeco on Friday July 22, 2022 @10:29AM
(#32192204)
74595s are incredibly useful, compatible with SPI interfaces, and completely forgotten by today's engineers.
I have a current project where I needed to drive a large number of CS lines on a SPI bus. Others suggested I/O expanders and even - good lord - an entire M0 controller to handle it. I solved it with a bitbanged chain of 74HC595s, under $1 in BOM cost.
I have a current project where I needed to drive a large number of CS lines on a SPI bus. Others suggested I/O expanders and even - good lord - an entire M0 controller to handle it. I solved it with a bitbanged chain of 74HC595s, under $1 in BOM cost.