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Altera_Forum
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12 years ago

IORD_ALTERA_AVALON_PIO_DATA execution speed

Is there a faster way to read a pin than using the IORD_ALTERA_AVALON_PIO_DATA macro? I'm finding the code below is running quite slow, but by removing the second condition (i.e. reducing the n...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

In this particular case you could write it as

if ((IORD_ALTERA_AVALON_PIO_DATA(PIO_CONTROL_IN_BASE) & 0x02) != 0) {
    sample_array = IORD_ALTERA_AVALON_PIO_DATA(PIO_ADC_DATA_BASE);
    i++;
}

In the more generaL case, avoid reading to the same HW-address multiple times and use a temporary variable
uint32 temp = IORD_ALTERA_AVALON_PIO_DATA(PIO_CONTROL_IN_BASE) ;
if ((temp == 0x02) || (temp == 0x03)) {
    sample_array = IORD_ALTERA_AVALON_PIO_DATA(PIO_ADC_DATA_BASE);
    i++;
}