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Altera_Forum
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16 years ago

Altera TSE driver and example program for lwIP (1.3.2)

After many many requests and complaints about lack of support and/or documentation for support of lwIP for the Altera TSE, I have developed a drop-in TSE driver and example program and made this avai...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Timers should normally use 'modulo' arithmetic - where you always subtract the two values that contain 'times' and then look at the value of the difference.

So if the current time is 'ms_ticks' use: 


if ((int)(ms_ticks - lwip250mStimer) >= 0) {
    /* timer has expired */
    lwip250mStimer += 250;
}
Rather than checking for ms_ticks >= lwip250mStimer.

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No, that doesn't work. It doesn't keep lwip250mStimer a multiple of 250 which the tests in the timer code require.

Bill