Day39 - IIO Capability Exposure

🎯 Objective

Verify capability exposure and validation behavior:

• sampling_frequency_available
• valid/invalid writes
• integration with FIFO + trigger buffer

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🔍 Step 1: Check capability

cat /sys/bus/iio/devices/iio:device0/sampling_frequency_available

Expected:

0 1 2 4 8 16 32 64 128

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✏️ Step 2: Write valid value

echo 16 | sudo tee /sys/bus/iio/devices/iio:device0/sampling_frequency

Expected:

• Success
• Sample rate updated

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❌ Step 3: Write invalid value

echo 3 | sudo tee /sys/bus/iio/devices/iio:device0/sampling_frequency

Expected:

Invalid argument

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🔄 Step 4: FIFO + trigger buffer test

echo 1 | sudo tee /sys/bus/iio/devices/iio:device0/fifo_enable

Then stream data:

cat /dev/iio:device0

Verify:

• Data rate changes with sampling_frequency
• FIFO behavior remains correct

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📊 Expected Result

• capability list is correct
• valid values accepted
• invalid values rejected
• data path unchanged