looking at several schematics and reading several articles i am still rather confused about spi and/or ftdi headers.
i design and build my own pcb's with a 328P mcu's. i am currently having to remove and replace every time if i want to update programming on the 328.
do i need both headers to upload new programming? if i read correctly on articles, the spi is only for the boot-loader onto chip and then used to control other chips from 328P. the ftdi is then used to program the update to the 328P.
Is this correct?
can i use a usb ftdi cable or do i need a converter board to use ftdi for uploads?
can someone point me in the direction i need or help me somehow to understand more clearly?
how do i incorporate into board when controlling other devices?