Hi, I wanted to ask if we can use the CON5 header pins (System Interface Expansion bus) as GPIO pins? By using as GPIO pins, I mean I want to just switch them on/off, that is, using as control signals. Is it possible to program them? Thank you.
Hello, Yes sure, a simple hardware can do this. I have used 1 74HC138 (write config) as address decoder, 2 74HC573 for 16 outputs. For inputs 1 74HC138 (read config) as address decoder, 2 74HC245 for 16 inputs.
Hello Shahid, can you explain more about this hardware done for you? You could show a schematic of this hardware?
Hello, I am testing the expansion connector as GPIO and output, I am working on the bank of memory 5 (nGCS5), I'm using a 74HC573 for this work, is not linked directly to the data pins. In the memory map, the starting physical address of the bank is 0x28000000. I tested it did not work, I created a dll for direct access to this memory location. Looking at other peripherals in S3C2440, I saw that for example, the IO pins are physically at the base address 0x56000000, but are declared at 0xB1600000, someone could I explain why? If anyone has used the expansion connector and can help me, thank you. If this works then I can go a detailed outline of how to connect the expansion port.