Hi all , i got a color lcd display (PCF8833 , that display from Sparkfun) , i can fully controle the lcd , display frames... the problem is that the LCD can run without pulling the /CS pin to low , as if the CS (chip select) signal is not connected to the lcd controller or its pulled low directly.
So i cant put multiple devices on the spi line , cuz without CS signal i cant select/unselect devices (slaves) , (am using atmega32/UC3B(AVR32) as uC).
I was wondering if i use a AND gate with two input one of them is inverted and connected to the uC chip select control , the other input is connected to the uC clock, ans the gate output is connected to the LCD clock , so i can control a "chip select" by controlling the clock line in the LCD
(clock to lcdenabled = /CS (AND gate input inverted) = 0 )
(clock to lcd disabled= /CS (AND gate input inverted) = 1 )
but i didnt fin a high speed and gate that works "bridges" a clock speed of 40MHZ (cuz i am testing that on a UC3B avr32 uC) .
is that any solutions , suggestions to put a ChipSelect signal to an SPI device that doesn have the /CS line.....