This way you will know exactly what is happening.
I've noticed on other threads people doing I/O bit-banging upwards to 150-MHz on the T4. \\begingroup\ SPI is a very simple protocol, so my advice would be to bit-bang it on both sides to get started rather than using libraries and the SPI hardware.
? Here is some of the old code, you'll notice it bit-bangs SPI, but there are no delays in there.ħ. Now the question mark: on looking at the old code for Soft SPI ops, I notice there are no delays in there, so I am wondering how the darn thing was throttled back far enough on the T4.x (running at 1.008 GHz, BTW) that it ran fine on the Lcd, which I believe is limited to 30-MHz SPI rate. Therefore, interested in a Soft SPI library, re item 1 above.Ħ. Now to the point: it occurs to me that Soft SPI is so fast on the T4.x that I can use multiple instantiations on different sets of pins, and not worry about issues with the Hard SPI ports. I thought it might be "much much slower".ĥ. Of interest, amazingly the Soft SPI test runs on average "only" 1.42X slower. So the results using ILI9341_t3 and the old Soft SPI code with the standard graphicstest program are shown below.
Bit bang spi arduino install#
So I grabbed the Adafruit_ILI9341 library circa 2016 from my old Teensyduino install on IDE v1.6.13, and at first it wouldn't compile, but I hacked on it a bit, and got it working.Ĥ. What I did do was try using Soft SPI with the ILI9341 displays and the T4.x, but that constructor no longer exists in the ILI9341_t3 library. I think other people do it, but I didn't spend a lot of time debugging. I tried using 2 instantiations of the ILI9341_t3 class to operate two standard Lcd modules from SPI0 (using different CS pins of course), but it wouldn't work for me. So, I d/l'ed Teensyduino v1.53 to Arduino IDE v.1.8.12 a couple of days ago.Ģ. This tells the slave to read the data on the MOSI line. Does someone have one? You'll know why I ask in a bit. For each of the 8 bits the SCK (clock) line is briefly brought high, and then low again. First off, I've tried to find a Soft SPI library for Teensy 4.x, but found little.
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