I am having issues with SPI between two BBB that may be simple to solve. I
have spidev_test loopback working on each board but am having problems
connecting the two.
spi0 master dts:
0x150 0x10 /* spi0_sclk, OUTPUT_PULLUP | MODE0 */
0x154 0x30 /* spi0_d0, INPUT_PULLUP | MODE0 */
0x158 0x10 /* spi0_d1, OUTPUT_PULLUP | MODE0 */
0x15c 0x10 /* spi0_cs0, OUTPUT_PULLUP | MODE0 */
spi slave dts:
0x150 0x30 /* spi0_sclk, INPUT_PULLUP | MODE0 */
0x154 0x10 /* spi0_d0, OUTPUT_PULLUP | MODE0 */
0x158 0x30 /* spi0_d1, INPUT_PULLUP | MODE0 */
0x15c 0x30 /* spi0_cs0, INPUT_PULLUP | MODE0 */
The oscilloscope shows activity when spi0_sckl (P9_17) is not connected but
nothing when P9_17 is connected between both boards.
I am sending bytes from master with the command: echo 1 > /dev/spidev1.0
I need 4-8mbit/sec transfer, is this achievable by bit banging over GPIO
and would that be a viable alternative to getting SPI working?
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