Pi experiments

examples/lldp.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+# requires `lldpctl` to be installed
+
+import sys
+import subprocess
+import os
+from time import sleep
+import pifacecad
+
+UPDATE_INTERVAL = 30  # 10 sec
+
+GET_LLDP_HOSTNAME_CMD = "lldpctl | grep SysName | awk '{print $2}'"
+GET_LLDP_PORT_CMD = "lldpctl | grep PortDescr | awk '{print $2}'"
+
+
+def run_cmd(cmd):
+    return subprocess.check_output(cmd, shell=True).decode('utf-8')
+
+def get_lldp_hostname():
+    return run_cmd(GET_LLDP_HOSTNAME_CMD)[:-1]
+
+def get_lldp_port():
+    return run_cmd(GET_LLDP_PORT_CMD)[:-1]
+
+
+def wait_for_neighbour():
+    hostname = ""
+    while len(hostname) <= 0:
+        sleep(1)
+        hostname = get_lldp_hostname()
+
+
+def show_lldpinfo():
+    while True:
+        cad.lcd.clear()
+        cad.lcd.write(get_lldp_hostname()+"\n"+get_lldp_port())
+        sleep(UPDATE_INTERVAL)
+
+
+if __name__ == "__main__":
+    # test for lldpd
+    try:
+        subprocess.call(["lldpctl"], stdout=open('/dev/null'))
+    except OSError as e:
+        if e.errno == os.errno.ENOENT:
+            print(
+                "lldpctl was not found, install with "
+                "`sudo apt-get install lldpd`")
+            sys.exit(1)
+        else:
+            raise  # Something else went wrong while trying to run `lldpd`
+
+    cad = pifacecad.PiFaceCAD()
+    cad.lcd.blink_off()
+    cad.lcd.cursor_off()
+
+    if "clear" in sys.argv:
+        cad.lcd.clear()
+        cad.lcd.display_off()
+        cad.lcd.backlight_off()
+    else:
+        cad.lcd.backlight_on()
+        cad.lcd.write("Waiting for LLDP..")
+        wait_for_neighbour()
+        show_lldpinfo()

examples/sysinfo.py

@@ -4,27 +4,36 @@
 from time import sleep
 import pifacecad
 
-
-UPDATE_INTERVAL = 60 * 5  # 5 mins
-GET_IP_CMD = "hostname --all-ip-addresses"
+UPDATE_INTERVAL = 10  # 10 sec
+GET_IP_CMD = "hostname --all-ip-addresses | awk '{print $1}'"
 GET_TEMP_CMD = "/opt/vc/bin/vcgencmd measure_temp"
 TOTAL_MEM_CMD = "free | grep 'Mem' | awk '{print $2}'"
 USED_MEM_CMD = "free | grep '\-\/+' | awk '{print $3}'"
+CPU_LOAD_CMD = "uptime | awk '{print $9}' | sed s/,/""/g"
+HOSTNAME_CMD = "hostname"
+FREE_DISK_CMD = "df -h | grep rootfs | awk '{print $5}'"
 
-temperature_symbol = pifacecad.LCDBitmap(
-    [0x4, 0x4, 0x4, 0x4, 0xe, 0xe, 0xe, 0x0])
-memory_symbol = pifacecad.LCDBitmap(
-    [0xe, 0x1f, 0xe, 0x1f, 0xe, 0x1f, 0xe, 0x0])
-temp_symbol_index, memory_symbol_index = 0, 1
+cpu_symbol = pifacecad.LCDBitmap( [0x0, 0x1f, 0x11, 0x15, 0x11, 0x1f, 0x0, 0x0] )
+disk_symbol = pifacecad.LCDBitmap( [0x0, 0x1c, 0x1e, 0x1e, 0x1e, 0x1e, 0x0, 0x0] )
+temperature_symbol = pifacecad.LCDBitmap( [0x4, 0x4, 0x4, 0x4, 0xe, 0xe, 0xe, 0x0] )
+memory_symbol = pifacecad.LCDBitmap( [0xe, 0x1f, 0xe, 0x1f, 0xe, 0x1f, 0xe, 0x0] )
 
+temp_symbol_index, memory_symbol_index, cpu_symbol_index, disk_symbol_index = 0, 1, 2, 3
 
 def run_cmd(cmd):
     return subprocess.check_output(cmd, shell=True).decode('utf-8')
 
+def get_cpu_load():
+    return run_cmd(CPU_LOAD_CMD)[:-1]
+
+def get_disk_usage():
+    return run_cmd(FREE_DISK_CMD)[:-1]
 
 def get_my_ip():
     return run_cmd(GET_IP_CMD)[:-1]
 
+def get_hostname():
+    return run_cmd(HOSTNAME_CMD)[:-1]
 
 def get_my_temp():
     return run_cmd(GET_TEMP_CMD)[5:9]
@@ -48,12 +57,20 @@ def show_sysinfo():
     while True:
         cad.lcd.clear()
         cad.lcd.write("IP:{}\n".format(get_my_ip()))
+        cad.lcd.write_custom_bitmap(cpu_symbol_index)
+        cad.lcd.write(":{} ".format(get_cpu_load()))
+        cad.lcd.write_custom_bitmap(memory_symbol_index)
+        cad.lcd.write(":{}".format(get_my_free_mem()))
 
+        sleep(UPDATE_INTERVAL)
+
+        cad.lcd.clear()
+        cad.lcd.write(format(get_hostname())+"\n")
         cad.lcd.write_custom_bitmap(temp_symbol_index)
-        cad.lcd.write(":{}C ".format(get_my_temp()))
+        cad.lcd.write(":{}C ".format(get_my_temp()))        
+        cad.lcd.write_custom_bitmap(disk_symbol_index)
+        cad.lcd.write(":{}".format(get_disk_usage()))
 
-        cad.lcd.write_custom_bitmap(memory_symbol_index)
-        cad.lcd.write(":{}".format(get_my_free_mem()))
         sleep(UPDATE_INTERVAL)
 
 
@@ -69,7 +86,9 @@ def show_sysinfo():
     else:
         cad.lcd.store_custom_bitmap(temp_symbol_index, temperature_symbol)
         cad.lcd.store_custom_bitmap(memory_symbol_index, memory_symbol)
+        cad.lcd.store_custom_bitmap(cpu_symbol_index, cpu_symbol)
+        cad.lcd.store_custom_bitmap(disk_symbol_index, disk_symbol)
         cad.lcd.backlight_on()
         cad.lcd.write("Waiting for IP..")
         wait_for_ip()
-        show_sysinfo()
+        show_sysinfo()