i.MX Processors中的主题 Re: using SPI2 with imx6ullevk user space

using SPI2 with imx6ullevk user space

fabio_poiatti — Wed, 15 Jan 2020 10:30:20 GMT

I would like to use SPI2 connected to accelerometer LSM6DSL.

I modified the DTS file including

&ecspi2 {
fsl,spi-num-chipselects = <1>;
cs-gpios = <&gpio4 22 0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi2_1 &pinctrl_ecspi2_cs_1>;
status = "okay";

spidev2@0x00 {
compatible = "spidev";
spi-max-frequency = <5000000>;
reg = <0>;
};
};

pinctrl_ecspi2_cs_1: ecspi2_cs_grp-1 {
fsl,pins = <
MX6UL_PAD_CSI_DATA01__GPIO4_IO22 0x10b0
>;
};

pinctrl_ecspi2_1: ecspi2grp-1 {
fsl,pins = <
MX6UL_PAD_CSI_DATA02__ECSPI2_MOSI 0x100b1
MX6UL_PAD_CSI_DATA03__ECSPI2_MISO 0x100b1
MX6UL_PAD_CSI_DATA00__ECSPI2_SCLK 0x100b1
>;
};

I see /dev/spidev1.0 .... but how can I try to communicate with the accelerometer?

Can I read and write on SPI like an USB or UART etc. with some command in user space like

cat < /dev/spidev1.0

Re: using SPI2 with imx6ullevk user space

igorpadykov — Thu, 16 Jan 2020 00:50:45 GMT

Hi Fabio

one can check variscite spidev tutorial:

DART-6UL SPI - Variscite Wiki

Best regards
igor
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Re: using SPI2 with imx6ullevk user space

fabio_poiatti — Tue, 21 Jan 2020 12:02:47 GMT

thanks