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--- en:u3_ioport_spi [2015/01/29 14:49]
john1117
+++ en:u3_ioport_spi [2015/07/22 15:49] (current)
ck.kim
@@ Line 1: / Line 1: @@
+====== SPI interface using the IO-Port #2 ======
+This page introduces how you can SPI interface using IO-Port on **ODROID-U3**.\\
+**Note that SPI port supports only master mode and 1.8 Volt interface like other IO ports on Exynos processor.**\\
+{{:en:u3:u3ioport_num.png?500|}}
+**J5 - 2x2 pins(IO Port #2)**\\
+This socket is not provides at revision 0.3
+^ Pin Number ^ Expansion Net Name ^ Export Number ^ Pin Number ^ Expansion Net Name ^ Export Number ^
+|1|XSPICLK_1 (GPB.4) | #21 |2|XSPICSN_1 (GPB.5) | #22 |
+|3|XSPIMOSI_1 (GPB.7) | #24 |4|XSPIMISO_1 (GPB.6)| #23 |
+<WRAP left round tip 100%>
+If your ODROID-U3 have old version kernel you need to update using odroid-utility.
+  sudo odroid-utility.sh
+</WRAP>
+**How to load the SPI driver module for generic SPI usage**\\
+Load the module to activate the SPI host.\\
+  sudo modprobe spi-s3c64xx
+Load the module to activate the generic SPI.
+  sudo modprobe spidev
+And you will have a standard SPI node.
+  ls /dev/spidev1.0
+**How to load the SPI driver module for serial Flash**\\
+Load the module to activate the SPI host.
+  sudo modprobe spi-s3c64xx
+Load the serial flash (misc) driver.
+  sudo modprobe odroid-ioboard
+And you will have a Serial Flash node.
+  ls /dev/ioboard-spi-misc
+**Where are the SPI device drivers in Kernel 3.8.y?**\\
+{{https://github.com/hardkernel/linux/blob/odroid-3.8.y/drivers/spi/spi-s3c64xx.c|SPI host interface driver}}\\
+{{https://github.com/hardkernel/linux/blob/odroid-3.8.y/drivers/spi/spidev.c|SPI generic driver}}\\
+{{https://github.com/hardkernel/linux/blob/odroid-3.8.y/drivers/hardkernel/ioboard-spi-misc.c|Serial SPI Flash add-on driver example}}
+We have tested the ioboard-spi-misc.ko with a Serial SPI Flash memory SST25WF020A on the new IO Shield and the maximum speed was 40Mhz of SPI clock.
+**How to change SPI clock **\\
+{{https://github.com/hardkernel/linux/blob/odroid-3.8.y/arch/arm/mach-exynos/mach-hkdk4412.c#L538|SPI Clock configuration}}\\
+{{http://dn.odroid.com/wiki_image/odroid-u3-spi-clock-40MHz.jpg?500|}}
+Refer this link to know the generic SPIDEV driver usage in detail.\\
+[[https://www.kernel.org/doc/Documentation/spi/spidev]]