Differences

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--- en:spi_dot_matrix [2016/05/18 14:25]
charles.park [How to fix device tree blob with command line]
+++ en:spi_dot_matrix [2017/06/16 14:05] (current)
odroid [Example of Scrolling Text]
@@ Line 10: / Line 10: @@
 </WRAP>
-==== How to fix device tree blob with command line ====
+=== How to enable driver (Only Ubuntu 16.04 or higher is required) ===
-Install device tree compiler package.
+Edit /etc/modprobe.d/blacklist-odroid.conf to comment out following two ines.
-  sudo apt-get install device-tree-compiler
-Create dts file from /media/boot/exynos5422-odroidxu3.dtb.
 <code>
-sudo -s
+blacklist spidev
-cd /media/boot
+blacklist spi_s3c64xx
-dtc -I dtb -O dts ./exynos5422-odroidxu3.dtb > ./exynos5422-odroidxu3.dts
-</code>
-Edit dts file to use vi editor.
-<code>
-vi ./exynos5422-odroidxu3.dts
-</code>
-Find string "spi@12d3".
-Add spi control data.
-<code>
-...
-	spi@12d30000 {
-		compatible = "samsung,exynos5410-spi";
-		reg = <0x12d30000 0x100>;
-		interrupts = <0x0 0x45 0x0>;
-		dma-mode;
-		dmas = <0x43 0x5 0x43 0x4>;
-		dma-names = "tx", "rx";
-		swap-mode;
-		#address-cells = <0x1>;
-		#size-cells = <0x0>;
-		clocks = <0x2 0x5cb 0x2 0x1027>;
-		clock-names = "spi", "spi_busclk0";
-		pinctrl-names = "default";
-		pinctrl-0 = <0x44>;
-		status = "okay";
-		cs-gpios = <0x45 0x5 0x0>;
-                /* ADD Line Start */
-		samsung,spi-src-slk = <0>;
-		num-cs = <0>;
-		spidev {
-			compatible = "spidev";
-			reg = <0>;
-			spi-max-frequency = <20000000>;
-			controller-data {
-				cs-gpio = <0x45 0x5 0x0>;
-				samsung,spi-feedback-delay = <0>;
-			};
-		};
-                /* ADD Line Ebd */
-	};
-...
-</code>
-<WRAP center round important 60%>
-controller-data 안의 **cs-gpio**값은 **cs-gpios** 와 동일하게 설정되어야 합니다.
-</WRAP>
-exynos5422-odroidxu3.dts파일을 수정
-Edit dtb file.
-<code>
-sudo -s
-fdtput -t x /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000 samsung,spi-src-clk 0
-fdtput -t x /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000 num-cs 0
-fdtput -c /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev
-fdtput -t s /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev compatible "spidev"
-fdtput -t x /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev reg 0
-fdtput -t i /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev spi-max-frequency 20000000
-fdtput -c /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev/controller-data
-fdtput -t x /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev/controller-data cs-gpio 0x46, 0x5, 0x0
-fdtput -t x /media/boot/exynos5422-odroidxu3.dtb /spi@12d30000/spidev/controller-data samsung,spi-feedback-delay 0
 </code>
@@ Line 93: / Line 21: @@
 Check your SPI node.
   ls /dev/spidev*
 ==== Compile & run SPI test example source code ====
@@ Line 194: / Line 123: @@
     struct spi_ioc_transfer tr;
+    memset((void *)&tr, 0x00, sizeof(tr));
     tr.tx_buf = (unsigned long)tx;
     tr.rx_buf = (unsigned long)rx;
@@ Line 272: / Line 203: @@
 ==== Example of Scrolling Text ====
+<WRAP round important 100%>
+<color #00a2e8>**WiringPi SPI API**</color> use case :
+Uncomment this line first.
+#define USE_WIRING_PI_LIB
+Build the example with proper library option.
+if defined USE_WIRING_PI_LIB
+      Compile : gcc -o <create excute file name> <source file name> -lwiringPi -lwiringPiDev -lpthread
+else
+      Compile : gcc -o <create excute file name> <source file name>
+</WRAP>
 <code>
 gcc -o dot_test dot_shift_test.c
@@ Line 422: / Line 368: @@
 {
     struct spi_ioc_transfer tr;
+    memset((void *)&tr, 0x00, sizeof(tr));
     tr.tx_buf           = (unsigned long)buf;