LED Games

gistfile1.txt

URL: https://goo.gl/6YzpZ1

cd litex-buildenv
git revert 8ebd52c65e10b8a25f1f9d8342c7c6d82320d44c

Add following snippet to device tree located at third_party/linux/arch/openrisc/boot/dts/or1klitex.dts:

+	green_led_gpios: gpio@e0006800 {
+		compatible = "wd,mbl-gpio", "basic-mmio-gpio";
+		reg = <0xe0006800 0x1>;
+		reg-names = "dat";
+
+		gpio-controller;
+		#gpio-cells = <2>;
+		gpio-line-names = "ld4", "ld5", "ld6", "ld7", "", "", "", "";
+	};

Rebuild kernel with ./scripts/build-linux.sh

sudo ifconfig tun0 down
sudo ifconfig usb0 192.168.100.100

make gateware-load

Welcome to Buildroot
buildroot login: root
cd /sys/class/gpio/
echo 507 > export
cd gpio507/
echo out > direction
echo 1 > value 


Welcome to Buildroot
buildroot login: root
 # gpioinfo
 gpiochip0 - 8 lines:
         line   0:        "ld4" "arty:green:ld4" output active-high [kernel]
         line   1:        "ld5" "arty:green:ld5" output active-high [kernel]
         line   2:        "ld6"       unused   input  active-high
         line   3:        "ld7"       unused   input  active-high
         line   4:      unnamed       unused   input  active-high
         line   5:      unnamed       unused   input  active-high
         line   6:      unnamed       unused   input  active-high
         line   7:      unnamed       unused   input  active-high

 # gpiofind "ld6"
 gpiochip0 2

 # gpioset gpiochip0 2=1

 # gpioset gpiochip0 2=0

1 is on, 0 is off. You can't request ld4 or ld5 as they are assigned
to the LED driver.

https://groups.google.com/forum/#!topic/linux-litex/zqH-ahxmkZ4