beremiz: tests/wiimote/py_ext_0@py_ext/pyfile.xml@68f4f2d4516b

use pregenerated CRC32 lookup tables for retain on Win32 and GNU/Linux

This code could be possible reused on low-end targets with limited RAM.

code to generate lookup table:
[---------------------------------------------------------------------]

/* CRC lookup table and initial state. */
uint32_t crc32_table[256];

/* Generate CRC32 lookup table. */
void GenerateCRC32Table(void)
{
unsigned int i, j;
/* Use CRC-32-IEEE 802.3 polynomial 0x04C11DB7 (bit reflected). */
uint32_t poly = 0xEDB88320;

for (i = 0; i <= 0xFF; i++)
{
uint32_t c = i;
for (j = 0 ; j < 8 ; j++)
c = (c & 1) ? (c >> 1 ) ^ poly : (c >> 1);
crc32_table[i] = c;
}
}

void main(void)
{
GenerateCRC32Table();
int j=0;
for(int i=0; i<256; i++) {
printf("0x%08X, ", crc32_table[i]);
if (++j >= 8) {
j = 0;
printf("\n");
}
}
}
[---------------------------------------------------------------------]

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<PyFile>
  <variables>
    <variable name="WiiNunchuckStickX" type="INT"/>
    <variable name="WiiNunchuckStickY" type="INT"/>
    <variable name="WiiNunchuckAccX" type="INT"/>
    <variable name="WiiNunchuckAccY" type="INT"/>
    <variable name="WiiNunchuckAccZ" type="INT"/>
    <variable name="WiiNunchuckButtons" type="WORD"/>
    <variable name="WiiButtons" type="WORD"/>
  </variables>
  <globals>
<![CDATA[
import cwiid,commands,sys,re,os,time

wiimote = None
WIIMOTE_ADDR_MODEL = re.compile("((?:[0-9A-F]{2})(?::[0-9A-F]{2}){5})\s*Nintendo")
nunchuckzero = None

def Wiimote_cback(messages, time):
    global nunchuckzero
    state = dict(messages)
    bts = state.get(cwiid.MESG_BTN, None)
    if bts is not None:
        PLCGlobals.WiiButtons = bts
    nunchuck = state.get(cwiid.MESG_NUNCHUK, None)
    if nunchuck is not None:
        PLCGlobals.WiiNunchuckButtons = nunchuck['buttons']
        X,Y = nunchuck['stick']
        PLCGlobals.WiiNunchuckAccX = nunchuck['acc'][cwiid.X]
        PLCGlobals.WiiNunchuckAccY = nunchuck['acc'][cwiid.Y]
        PLCGlobals.WiiNunchuckAccZ = nunchuck['acc'][cwiid.Z]
        if nunchuckzero is None:
            nunchuckzero = X,Y
        (PLCGlobals.WiiNunchuckStickX,
         PLCGlobals.WiiNunchuckStickY) = X-nunchuckzero[0],Y-nunchuckzero[1]

def Connect_Wiimote(connected_callback):
    global wiimote,nunchuckzero
    mac_addr = ''
    try:
        mac_addr = file("wiimac.txt","rt").read()
    except:
        PLCObject.LogMessage("Wiimote MAC unknown, scanning bluetooth")
        output = commands.getoutput("hcitool scan")
        result = WIIMOTE_ADDR_MODEL.search(output)
        if result is not None:
            mac_addr = result.group(1)
            PLCObject.LogMessage("Found Wiimote with MAC %s"%mac_addr)
            file("wiimac.txt","wt").write(mac_addr)
 
    # Connect to wiimote
    if not mac_addr:
        PLCObject.LogMessage("Connection to unknown Wiimote...")
        wiimote = cwiid.Wiimote()
    else:
        PLCObject.LogMessage("Connection to Wiimote %s..."%mac_addr)
        wiimote = cwiid.Wiimote(mac_addr)

    if wiimote is not None:
        nunchuckzero = None
        wiimote.rpt_mode = cwiid.RPT_BTN | cwiid.RPT_EXT
        # use the callback interface
        wiimote.mesg_callback = Wiimote_cback
        wiimote.enable(cwiid.FLAG_MESG_IFC)
        connected_callback(mac_addr)
        PLCObject.LogMessage("Wiimote %s Connected"%mac_addr)
    else:
        PLCObject.LogMessage("Wiimote %s not found"%mac_addr)
        os.remove("wiimac.txt")
        connected_callback(None)

def Disconnect_Wiimote():
  global wiimote
  if wiimote is not None:
    wiimote.disable(cwiid.FLAG_MESG_IFC)
    time.sleep(0.1)
    wiimote.close()
    wiimote = None
    PLCObject.LogMessage("Wiimote disconnected")

]]>
  </globals>
  <init>
<![CDATA[
]]>
  </init>
  <cleanup>
<![CDATA[
Disconnect_Wiimote()

]]>
  </cleanup>
  <start>
<![CDATA[
]]>
  </start>
  <stop>
<![CDATA[
]]>
  </stop>
</PyFile>

author	Andrey Skvortsov <andrej.skvortzov@gmail.com>
	Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499	68f4f2d4516b
parent 1185	b36755d7c19e
permissions	-rw-r--r--