beremiz: NativeLib.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"?>
<project xmlns="http://www.plcopen.org/xml/tc6.xsd"
         xsi:schemaLocation="http://www.plcopen.org/xml/tc6.xsd"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns:xhtml="http://www.w3.org/1999/xhtml">
  <fileHeader companyName="Unknown"
              productName="Unnamed"
              productVersion="1"
              creationDateTime="2013-01-29T14:01:00"/>
  <contentHeader name="Unnamed"
                 modificationDateTime="2013-02-26T15:59:13">
    <coordinateInfo>
      <fbd>
        <scaling x="0" y="0"/>
      </fbd>
      <ld>
        <scaling x="0" y="0"/>
      </ld>
      <sfc>
        <scaling x="0" y="0"/>
      </sfc>
    </coordinateInfo>
  </contentHeader>
  <types>
    <dataTypes>
      <dataType name="LOGLEVEL">
        <baseType>
          <enum>
            <values>
              <value name="CRITICAL"/>
              <value name="WARNING"/>
              <value name="INFO"/>
              <value name="DEBUG"/>
            </values>
          </enum>
        </baseType>
        <initialValue>
          <simpleValue value="INFO"/>
        </initialValue>
      </dataType>
    </dataTypes>
    <pous>
      <pou name="LOGGER" pouType="functionBlock">
        <interface>
          <inputVars>
            <variable name="TRIG">
              <type>
                <BOOL/>
              </type>
            </variable>
            <variable name="MSG">
              <type>
                <string/>
              </type>
            </variable>
            <variable name="LEVEL">
              <type>
                <derived name="LOGLEVEL"/>
              </type>
              <initialValue>
                <simpleValue value="INFO"/>
              </initialValue>
            </variable>
          </inputVars>
          <localVars>
            <variable name="TRIG0">
              <type>
                <BOOL/>
              </type>
            </variable>
          </localVars>
        </interface>
        <body>
          <ST>
<![CDATA[IF TRIG AND NOT TRIG0 THEN
{{
 LogMessage(GetFbVar(LEVEL),(char*)GetFbVar(MSG, .body),GetFbVar(MSG, .len));
}}
END_IF;
TRIG0:=TRIG;
]]>
          </ST>
        </body>
      </pou>
    </pous>
  </types>
  <instances>
    <configurations/>
  </instances>
</project>

author	Andrey Skvortsov <andrej.skvortzov@gmail.com>
	Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499	68f4f2d4516b
parent 1050	56bef276055e
permissions	-rw-r--r--