Hi, I am using BB Black to work with a motion sensor through SPI.
By doing *echo BB-SPIDEV0 > /sys/devices/bone_capemgr.9/slots* I am able to get */dev/spidev1.0* and */dev/spidev1.1,* which are supposed to be output and input PIN of SPI0 in mode0. I wire P9 pin 18 and 21, and tested spidev_test.c, and I got the expected results. However,after I wire my sensor PINS of MISO, MOSI, CS, VDD, and GND to BB Black's corresponding PINS, and use functions *ioctl(fd, SPI_IOC_MESSAGE(1), &tr)*; to read one byte (a known value) from a register in the motion sensor, I cannot get what I want. I guess there are some settings I may not get them right. Can any expert show me what are the proper ways/procedure to 1, read *n* bytes from the sensor starting from a register 2, write n bytes to the sensor In the spidev_test example, I use either */dev/spidev1.0* or */dev/spidev1.1, *I can get the expected result. In my sensor case, which device handle shall I use? From the DTS description, spidev1.1 is the output PIN. So shall I use spidev1.1 to do writing and then read from spidev1.0? -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
