Bug #1537
Digital/Analog loopback test randomly fails for -p2
| Status: | New | Start date: | 2016-01-26 | |
|---|---|---|---|---|
| Priority: | Low | Due date: | ||
| Assignee: | - | % Done: | 0% | |
| Category: | - | |||
| Target version: | - |
Description
When the buffer size is 2 (-p2), this randomly fails in that the first loopback sample received is not the expected one. Maybe some stale memory somewhere? Or the DAC itself? Regardless of the number of analog channels in use
History
#1
Updated by Giulio Moro about 9 years ago
- Status changed from New to Rejected
It is expected behaviour, as the first two analog in samples of the first buffer that comes in are actually sampled BEFORE the first two GPIO or analog outputs are written, so their value, for the purpose of this test, is undefined.
#2
Updated by Giulio Moro about 9 years ago
- Status changed from Rejected to New
It does not fail on the first loopback buffer. Rather, each of the paragraphs below is an example of failure
D expected: 1, received: 0 0, pointer: 0, delay: -1, count: 6
D expected: 1, received: 0 0, pointer: 0, delay: -1, count: 6
expected: 1, received: 0 0, pointer: 1, delay: 0, count: 8
D expected: 0, received: 0 1, pointer: 0, delay: 0, count: 4