DART-6UL SPI: Difference between revisions

Revision as of 09:36, 25 September 2016

DART-6UL- SPI

Testing SPI from user space require some changes.

Configure your kernel and add spidev driver. Device Drivers -> SPI support -> <*> User mode SPI device driver support
Add spidev to your device tree

&ecspi1 {
	fsl,spi-num-chipselects = <1>;
	cs-gpios = <&gpio3 10 0>;
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_ecspi1_1>;
	status = "okay";

        chip1: spidev@0 {
               compatible = "spidev";
               spi-max-frequency = <12000000>;
               reg = <0>;
        };
/*
        chip2: spidev@1 {
               compatible = "spidev";
               spi-max-frequency = <20000000>;
               reg = <1>;
	};
*/
};

Pick and choose the right chip select and you can also have multiple chip selects.

Compile the Linux kernel and device tree.
For testing use the application:
https://raw.githubusercontent.com/varigit/linux-2.6-imx/master/Documentation/spi/spidev_test.c

@@ Line 4: / Line 4: @@
 * Configure your kernel and add spidev driver. Device Drivers -> SPI support -> <*>   User mode SPI device driver support<br>
 * Add spidev to your device tree<br>
-<pre>&ecspi1 {
+<pre>
+&ecspi1 {
 	fsl,spi-num-chipselects = <1>;
 	cs-gpios = <&gpio3 10 0>;
@@ Line 24: / Line 25: @@
 */
 };
-};</pre>
+</pre>
 Pick and choose the right chip select and you can also have multiple chip selects.
 * Compile the Linux kernel and device tree.
 * For testing use the application:<br>https://raw.githubusercontent.com/varigit/linux-2.6-imx/master/Documentation/spi/spidev_test.c