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

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?