Hello,
Any luck on this? I have the same issue.
On Saturday, April 12, 2014 at 3:39:58 AM UTC-5, Babak Rezai wrote:
>
> Im trying to use the Beaglebone Black as a slave device and read from the
> arduino over SPI.
>
> Im confused as to why I am just getting 255 repeated over and over on the
> terminal as an output.
> My thought is that there is some kind of a memory leak or buffer overflow.
> I just can not figure out what
> I'm doing wrong. Is one supposed to set cs as input? even with it set to
> output I have the same issue.
>
> I have my dts file set as:
>
> /dts-v1/;
> /plugin/;
>
> / {
> compatible = "ti,beaglebone", "ti,beaglebone-black";
>
> /* identification */
> part-number = "spi0pinmux";
>
> fragment@0 {
> target = <&am33xx_pinmux>;
> __overlay__ {
> spi0_pins_s0: spi0_pins_s0 {
> pinctrl-single,pins = <
> 0x150 0x30 /* spi0_sclk, INPUT_PULLUP | MODE0 */
> 0x154 0x30 /* spi0_d0, INPUT_PULLUP | MODE0 */
> 0x158 0x10 /* spi0_d1, OUTPUT_PULLUP | MODE0 */
> 0x15c 0x30 /* spi0_cs0, INPUT_PULLUP | MODE0 */
> >;
> };
> };
> };
>
> fragment@1 {
> target = <&spi0>;
> __overlay__ {
> #address-cells = <1>;
> #size-cells = <0>;
>
> status = "okay";
> pinctrl-names = "default";
> pinctrl-0 = <&spi0_pins_s0>;
>
> spidev@0 {
> spi-max-frequency = <24000000>;
> reg = <0>;
> compatible = "linux,spidev";
> };
> };
> };
> };
>
> My Arduino is wired up like so:
> P9.22 SPI0_CLK - Orange - 0x150 0x30 --> Arduino Due 110 SCLK
> P9.21 SPI0_D0 - Green - 0x154 0x30 --> Arduino Due 109 MOSI
> P9.18 SPI0_D1 - White - 0x158 0x10 --> 108 MISO
> P9.17 SP0_CS0 - Black - 0x15C 0x30 ---> Pin 10 Set as Slave Select
>
> Python File:
> import spidev
> import time
> spi = spidev.SpiDev()
> spi.open(1,0)
> while True:
> resp = spi.readbytes(1)
> print resp[0]
>
>
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