Topics created by optech

@optech Happy to know that the intial phase is over. So, what is next? https://github.com/OnionIoT/omega2-lmic-lorawan -interfacing to Omega2 through SPI-I2C bridge,library supports SX1276/8) https://www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html -Cortex-M4+SX126X(ST Micro), Comes with factory loaded AT command fw, supports ClassA/B/C, has built-in UART/ADC/I2C/GPIO.. & programmamable using ST CubeMX) Or any other? Curious to know which is your pick.. (I was not aware of that this chirpy thing existed .. !!) Thanks

@luz Thank you for detailed explanation. I probably will use soft spi because of parallel usage needs of two devices. it will be too slow but there is no other chance. I will need to make some hardware design changes. But i couldnt understand why hardware spi count is limited in openwrt side. i know MT7688 has two hardware supported spi cs pin but it could be increased by openwrt side as adding gpios as cs with hardware spi. Thanks again @luz

@optech Depending on the higspeed mode used, the MT7688's UART may not be very precise at high baud rates. If you have a look at the MT7688 datasheet on page 157ff, you see that for 115200 there's a divisor of 14 (down from 26Mhz) for the UART clock (which is divided by 16 to get to the baud rate) when highspeed_mode=0. So the effective baud rate you'd get is 26E6/14/16 = 116071. I don't know what mode is used in uboot (and linux tty driver, for that matter), but I would not be suprised if it was the simple non-high-speed mode. Apparently, FTDI chips (I only use those, because of no driver hassles for those on macOS) are a bit more tolerant than others to inprecise baud rates. So I never experienced this in my daily work (I have >1000 Omega2 based products in the field). However, for a project I had to calculate the exact sending time for a byte stream @ 9600 baud - which turned out to need adjustments exactly due to not quite precise baud rate…

@crispyoz Yes it is. I remember. Thank you

@optech small victories lead to larger ones.