A collection of MaixPy scripts and libraries for the Maix Amigo. While this board is focused on AI, especially computer vision (and seems to be be quite good at it), I bought, and am using, this board as a portable IOT device. 480x320 TFT, SD card, expansion ports, fast! What else could I wish for?

There are a bunch of MaixPy scripts and libraries here, but they are not very well documented, and most are not specifically for the Amigo. So I am looking at stuff there, and augmenting, fixing, rewriting...

The first issue was connectivity: the 2 SP-MOD connectors at the back have pins that are already in use. So I had to hack something together:

The original library doesn't work for the Amigo – wrong pinouts – and is not very well written. So I made it work for my device, and added a bunch of functions, while fixing stuff.

I fixed that function, which accepted only a small set of frequencies. I made it more versatile.

    def setFrequency(self, frequency):
        self._frequency = frequency
        #frfs = {169E6: (42, 64, 0),
        #        433E6: (108, 64, 0),
        #        434E6: (108, 128, 0),
        #        866E6: (216, 128, 0),
        #        868E6: (217, 0, 0),
        #        915E6: (228, 192, 0)}
        # that's stupid and lazy.
        # Enable all and any frequency
        #FXOSC = 32000000.0
        #FSTEP = (FXOSC / 524288)
        # 61.03516
        frf = int(frequency / 61.03516)
        self.writeRegister(REG_FRF_MSB, (frf >> 16) & 0xff)
        self.writeRegister(REG_FRF_MID, (frf >> 8) & 0xff)
        self.writeRegister(REG_FRF_LSB, frf & 0xff)

You can now set BW either by frequency (say 125e3 for 125 KHz), or by number (BW 7 = 125 KHz). 500 KHz was missing too, so I added it.

There were no functions to enquire about current settings – which sucked major goat balls. We now have:

• getTxPower(self):
• getFrequency(self):
• getSpreadingFactor(self):
• getSignalBandwidth(self):
• getCodingRate(self):
• getPreambleLength(self):
• getSyncWord(self):

I'm planning to add a decent dumpRegisters function, based on my C++ code in LoRaStuff.h.

This sample app builds a touch-screen menu that allows me to do some basic LoRa distance tests. I'm planning to add at some point a GPS module, so that I can calculate the distance, with the Haversine formula. The app itself works well enough, and can send PINGs, and displays incoming messages withh RSSI and SNR.

This small script acquires continuously a 320x240 photo and displays it, while printing the fps in the serial terminal.