Skip to content

Latest commit

 

History

History
91 lines (79 loc) · 2.77 KB

HOWTO.md

File metadata and controls

91 lines (79 loc) · 2.77 KB

HOWTO:

This document describes how to configure and use the periperals of your board from Linux.

Configure/Use the Leds: Configure the Leds GPIOs as outputs:

$echo 508 > /sys/class/gpio/export
$echo out > /sys/class/gpio/gpiochip508/direction

Set the Leds value:

$echo 0 > /sys/class/gpio/gpio508/value
$echo 1 > /sys/class/gpio/gpio508/value

Configure/Use the PWM RGB Led:

$ cd /sys/class/pwm/pwmchip0
$ echo 0 > export
$ cd pwm0
$ echo 100 > period
$ echo 50 > duty_cycle
$ echo 1 > enable

This should turn configure the Led with 50% PWM that you can adjust by changing duty_cycle value from 0 to the configured period.

Configure/Use Ethernet: Verify that the eth0 ethernet device is present: $ ifconfig -a:

eth0      Link encap:Ethernet  HWaddr C6:6A:FB:04:6A:B9
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

sit0      Link encap:IPv6-in-IPv4
          NOARP  MTU:1480  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

Configure it: $ ifconfig eth0 192.168.1.50

Verify that you can ping another machine on your network: $ ping 192.168.1.100:

PING 192.168.1.100 (192.168.1.100): 56 data bytes
64 bytes from 192.168.1.100: seq=0 ttl=64 time=19.839 ms
64 bytes from 192.168.1.100: seq=1 ttl=64 time=4.585 ms
64 bytes from 192.168.1.100: seq=2 ttl=64 time=8.510 ms
64 bytes from 192.168.1.100: seq=3 ttl=64 time=12.522 ms
^C
--- 192.168.1.100 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 4.585/11.364/19.839 ms

Configure/Use the SPI Flash: There should be a /dev/mtd0 that you can read from/write to directly from bash, i.e.,:

$ cat /dev/mtd0

Or even better, to see the data clearly:

$ dd if=/dev/mtd0 count=6 bs=1 status=none | hexdump

Before writing you should erase the flash first. This requires BR2_PACKAGE_MTD and BR2_PACKAGE_MTD_JFFS_UTILS to be enabled in the buildroot config.

$ flash_erase /dev/mtd0 0 1
$ echo -ne "\x01\x01" > /dev/mtd0

Configure/Use the SDCard: TODO