ADS7128 CRC Test
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Test 1: GPIO round-trip with CRC
  CH0=HIGH, CH1=HIGH ... PASS
  CH0=LOW, CH1=LOW ... PASS

Test 2: ADC read with CRC
  CH3: 2333 (2.85 V) ... PASS
  CRC errors: none ... PASS

Test 3: Bulk reads with CRC (20 reads)
  CRC errors after bulk: none ... PASS

Test 4: CRC disable/re-enable
  Without CRC: CH0=HIGH, CH1=HIGH ... PASS
  Re-enabled CRC: CH0=LOW, CH1=LOW ... PASS

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RESULTS: 7/7 tests passed
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