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spi example

starbright

Does someone has got a small example about howto communicate via SPI to a device? What is to do?

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    Thank for this links - idea is good. But this is for ISE and rather complex stuff. I do have a MicroZed I/O Carrier board.

    I think, the simpliest way is use a spidev driver, as there is already an example in kernel.

    So I included SPIDEV into kernel configuration. Nevertheless there is no /dev/spi* device to see. I checked the devicetree. In the section
    tps7_axi_interconnect_0: amba@0 {
    there are two spi nodes:
    ttps7_spi_0: ps7-spi@e0006000 {
    tttclock-names = "ref_clk", "pclk", "aper_clk";
    tttclocks = <&clkc 25>, <&clkc 34>, <&clkc 34>;
    tttcompatible = "xlnx,zynq-spi-r1p6", "xlnx,ps7-spi-1.00.a";
    tttinterrupt-parent = <&ps7_scugic_0>;
    tttinterrupts = <0 26 4>;
    tttnum-chip-select = <4>;
    tttreg = <0xe0006000 0x1000>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tt} ;
    ttps7_spi_1: ps7-spi@e0007000 {
    tttclock-names = "ref_clk", "pclk", "aper_clk";
    tttclocks = <&clkc 26>, <&clkc 35>, <&clkc 35>;
    tttcompatible = "xlnx,zynq-spi-r1p6", "xlnx,ps7-spi-1.00.a";
    tttinterrupt-parent = <&ps7_scugic_0>;
    tttinterrupts = <0 49 4>;
    tttnum-chip-select = <4>;
    tttreg = <0xe0007000 0x1000>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tt} ;

    But this seems to be not enough to get an spi device running.

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  • 0

    Thank for this links - idea is good. But this is for ISE and rather complex stuff. I do have a MicroZed I/O Carrier board.

    I think, the simpliest way is use a spidev driver, as there is already an example in kernel.

    So I included SPIDEV into kernel configuration. Nevertheless there is no /dev/spi* device to see. I checked the devicetree. In the section
    tps7_axi_interconnect_0: amba@0 {
    there are two spi nodes:
    ttps7_spi_0: ps7-spi@e0006000 {
    tttclock-names = "ref_clk", "pclk", "aper_clk";
    tttclocks = <&clkc 25>, <&clkc 34>, <&clkc 34>;
    tttcompatible = "xlnx,zynq-spi-r1p6", "xlnx,ps7-spi-1.00.a";
    tttinterrupt-parent = <&ps7_scugic_0>;
    tttinterrupts = <0 26 4>;
    tttnum-chip-select = <4>;
    tttreg = <0xe0006000 0x1000>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tt} ;
    ttps7_spi_1: ps7-spi@e0007000 {
    tttclock-names = "ref_clk", "pclk", "aper_clk";
    tttclocks = <&clkc 26>, <&clkc 35>, <&clkc 35>;
    tttcompatible = "xlnx,zynq-spi-r1p6", "xlnx,ps7-spi-1.00.a";
    tttinterrupt-parent = <&ps7_scugic_0>;
    tttinterrupts = <0 49 4>;
    tttnum-chip-select = <4>;
    tttreg = <0xe0007000 0x1000>;
    ttt#address-cells = <1>;
    ttt#size-cells = <0>;
    tt} ;

    But this seems to be not enough to get an spi device running.

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