Differences

This shows you the differences between two versions of the page.

--- en:c1_hardware_spidev [2016/04/01 13:14]
charles.park [Loading SPI driver]
+++ en:c1_hardware_spidev [2016/06/17 14:26] (current)
odroid [SPI-mode change test]
@@ Line 12: / Line 12: @@
 ===== Loading SPI driver =====
-Dedicated pins for SPI are configured for GPIO, these pins can be configured as I2C bus while change the pin configuration. In order to change the configuration, you must load the driver.
+Dedicated pins for SPI are configured for GPIO, these pins can be configured as SPI bus while change the pin configuration. In order to change the configuration, you must load the driver.
 <code>
 $ sudo modprobe spicc
@@ Line 39: / Line 39: @@
 {{http://dn.odroid.com/wiki_image/a.png?500|SPIDEV-32bits-1Mhz}}
+===== SPI-mode change test =====
+<WRAP  left round important 100%>
+**Update**\\
+SPI mode works correctly only with kernel version 3.10.96-151 or higher\\
+</WRAP>\\
+\\
+spidev 32 bits per word, spi mode = 0 \\
+<code>
+$ sudo ./spidev_test -D /dev/spidev0.0 -s 1000000 -b 32
+</code>
+{{http://dn.odroid.com/wiki_image/spi_mode_0.png?500|SPIDEV-32bits-mode-0}}
+spidev 32 bits per word, spi mode = 1
+<code>
+$ sudo ./spidev_test -D /dev/spidev0.0 -s 1000000 -b 32 -H
+</code>
+{{http://dn.odroid.com/wiki_image/spi_mode_1.png?500|SPIDEV-32bits-mode-1}}
+spidev 32 bits per word, spi mode = 2
+<code>
+$ sudo ./spidev_test -D /dev/spidev0.0 -s 1000000 -b 32 -O
+</code>
+{{http://dn.odroid.com/wiki_image/spi_mode_2.png?500|SPIDEV-32bits-mode-2}}
+spidev 32 bits per word, spi mode = 3
+<code>
+$ sudo ./spidev_test -D /dev/spidev0.0 -s 1000000 -b 32 -H -O
+</code>
+{{http://dn.odroid.com/wiki_image/spi_mode_3.png?500|SPIDEV-32bits-mode-3}}
 ** spidev_test source code **
@@ Line 45: / Line 81: @@
 <code>
-gcc -o spidev_test spidev_test.c
+$ gcc -o spidev_test spidev_test.c
 </code>