tests/python/c_code@c_ext/cfile.xml
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Sun, 06 Jan 2019 01:22:46 +0300
changeset 2499 68f4f2d4516b
parent 1463 de311ffe3961
permissions -rw-r--r--
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");
}
}
}
[---------------------------------------------------------------------]
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<?xml version='1.0' encoding='utf-8'?>
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<CFile xmlns:xhtml="http://www.w3.org/1999/xhtml">
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  <includes>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </includes>
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  <variables>
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    <variable name="TestInput" type="SINT" initial="0"/>
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    <variable name="TestOutput" type="SINT"/>
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  </variables>
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  <globals>
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    <xhtml:p><![CDATA[
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volatile long Lock=0;
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volatile char PtoC=1,CtoP=2;
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extern long AtomicCompareExchange(long*,long, long);
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extern char *PLC_ID;
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int Simple_C_Call(int val){
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  return val+1;
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}
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int Python_to_C_Call(char toC, char *fromC){
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  /* Code called by python should never touch to 
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     variables modified by PLC thread directly
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     AtomicCompareExchange comes from 
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     beremiz' runtime implementation */
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  int res = 0;
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  if(!AtomicCompareExchange((long*)&Lock, 0, 1)){
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    PtoC=toC;
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    *fromC=CtoP;
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    AtomicCompareExchange((long*)&Lock, 1, 0);
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    res=1;
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  }
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  printf("C code called by Python: toC %d fromC %d\n",toC,*fromC);
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  printf("PLC_ID id %s\n",PLC_ID);
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  return res;
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}
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int PLC_C_Call(char fromPLC, char *toPLC){
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  /* PLC also have to be realy carefull not to 
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     conflict with asynchronous python access */
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  if(!AtomicCompareExchange((long*)&Lock, 0, 1)){
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      CtoP = fromPLC;
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      *toPLC = PtoC;
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      AtomicCompareExchange((long*)&Lock, 1, 0);
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      return 1;
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  }
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  return 0;
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}
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]]></xhtml:p>
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  </globals>
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  <initFunction>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </initFunction>
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  <cleanUpFunction>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </cleanUpFunction>
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  <retrieveFunction>
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    <xhtml:p><![CDATA[
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]]></xhtml:p>
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  </retrieveFunction>
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  <publishFunction>
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    <xhtml:p><![CDATA[
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if(!AtomicCompareExchange((long*)&Lock, 0, 1)){
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    TestInput = CtoP + PtoC + TestOutput;
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    AtomicCompareExchange((long*)&Lock, 1, 0);
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}
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]]></xhtml:p>
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  </publishFunction>
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</CFile>