Hi, I've been playing with the PRi 4 for a couple of days and am still frustrated.
My goal is to 'make' 4 signals like the following at about 10-50MHz:
I have an Arduino but it can't do such high frequency, then I bought the RPi 4. Started as a beginner, I installed Raspbian. I used the GPIO and SPI functions in wiringPi and bcm2835 libraries. But either the frequency is not enough, or the signal is very ugly and erratic. Then I read that Raspbian is not a real time OS and can't deal with accurate timing issues. Then I switched to bare metal. I followed some old RPi bare metal tutorials (can't find any tutorial specially made for RPi 4) but haven't made anything happen so far.
Can anyone point me a direction on how to generate those signals at frequency around 20 MHz? Thanks so much.