8/8/2023 0 Comments Debug through spi arduinoOh, and by the way, connect the Arduino’s grounds together. Basically, if the chip stops working, you’ve gone too far!įollowing that, connect pins 10-13 of the second (debug) Arduino to the matching pins on the main Arduino – unless it’s a Mega, where the SPI lines are higher up: Note that buff is about as big a buffer as you can get for an ATmega168 – you can tweak it for an ATmega328 chip and increase it a bit since you have more RAM. replace prev char with '?' to indicate overflow no room - can just exit, but instead we'll Next = ( inpoint >= sizeof(buff)-1 ? 0 : inpoint+1 ) ISR (SPI_STC_vect) // SPI interrupt routine have to send on master in, *slave out* Serial.println ("nDebugging Session On.n") I used a dedicated Pro Mini and TTL-USB device, and uploaded this code:Ĭhar buff // about max avail for atmega168 As long as I don’t overflow buffers (which we’ll talk about in a moment), I had my debug lines. This way, the main program can send ‘light’ messages quick and simple to the second Arduino, whose task is to send them to the PC when it can. In my case, I wanted to send it to my PC from the second Arduino at the full 115,200 bps. In it, he showed how to make a second Arduino a ‘slave’ to the first, receiving the SPI information and then doing something with it. Nick Gammon had gone into SPI in two tutorials on his site here and here (and an interesting discussion of timing here). With all the positives, I geared up to write some SPI code and get my ‘debug on’ – then I went on the Internet and researched, and found out it had been done already. Send debug on SPI, and your serial line is completely free – handy if you are writing serial code.
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