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@mdd
Hi Gordon,
bravo ! it works(with l476rg startup file). now the build passed, board flashed and LED blinking successfully. you are so helpful :)
play a bit I find my favorite neopixel library is not working. by referring to other build, I ported the driver for STM32_LL, but either follow STM32 or WIO_LTE approach, it's not working.
check further, WIO_LTE approach drive GPIO directly with specific timing, STM32 use SPI(16bit then send 4bit), both are not working on B5(SPI1 MOSI), use B4(SPI1 MISO), can turn the LED constant on, so seems SPI is working. the error message for STM32 approach is "no suitable SPI device found for this pin", for WIO_LTE approach is no response.
I tried to use SPI directly(like SPI1.send4bit([255,0,0], 0b0001, 0b0011)), it's not working and the error message is : SPI.send4bit only work on hardware SPI.
any idea or hint for this ?
thanks.