awef Posted January 28, 2017 Share Posted January 28, 2017 Orange Pi Zero - SPI1 - SPI_MOSI - Seems "weak" SPI_SCLK is Peak-to-Peak 3.3v (no problem) SPI_MOSI is Peak-to-Peak 165mv (whoa strange! hooked up to the o-scope) I suspect that MOSI is "dead" in my config since the waveform matches SPI_SCLK almost exactly, so perhaps it's crosstalk or something of that sort. I think my FEX is good. Anybody else with experience? Does anyone else experience this problem? root@orangepizero:/dev# ls -al spi* crw------- 1 root root 153, 0 Jan 28 12:17 spidev0.0 crw------- 1 root root 153, 1 Jan 28 12:17 spidev1.0 [spi0] spi_used = 1 spi_cs_bitmap = 1 spi_mosi = port:PC00<3><default><default><default> spi_miso = port:PC01<3><default><default><default> spi_sclk = port:PC02<3><default><default><default> spi_cs0 = port:PC03<3><1><default><default> [spi1] spi_used = 1 spi_cs_bitmap = 1 spi_cs0 = port:PA13<2><default><default><default> spi_sclk = port:PA14<2><default><default><default> spi_mosi = port:PA15<2><default><default><default> spi_miso = port:PA16<2><default><default><default> [spi_devices] spi_dev_num = 2 [spi_board0] modalias = "spidev" max_speed_hz = 33000000 bus_num = 0 chip_select = 0 mode = 0 full_duplex = 1 manual_cs = 0 [spi_board1] modalias = "spidev" max_speed_hz = 33000000 bus_num = 1 chip_select = 0 mode = 0 full_duplex = 1 manual_cs = 0 Link to comment Share on other sites More sharing options...
awef Posted January 28, 2017 Author Share Posted January 28, 2017 FYI Replicated this on both the OPi Zero 256 and 512mb version, so it's not a board/model specific issue. Perhaps a SW config issue? Link to comment Share on other sites More sharing options...
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