Hello, I am trying to figure out how to tristate the miso pin on an RA8875 breakout board from Adafruit.
I want to connect an SD card and the RA8875 lcd driver at the same time, both using SPI
I tried following this diagram:
However, i noticed in its diagram it uses a 74HC125. I do not have one of those handy, so i used a 74AHC125 but it doesn't seem to be working.... the LCD screen still works, but only if i have the SD card disconnected... just like it did before i attempted the fix.
Is there are difference between the 74AHC125 and the 74HC125 and if there is (i'm assuming the A is there for a reason) is there a way to modify my connections to make it work?
Alternately, i heard that the Teensy has multiple SPI busses, but from what i can tell the libraries for SD card to allow you to specify which SPI bus to use???