diff options
| author | Patrick Van Oosterwijck <patrick@silicognition.com> | 2021-03-17 23:15:20 -0600 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2023-12-15 17:04:33 +1100 |
| commit | 06df3b29256e4e90abc61505a28852268cf64af7 (patch) | |
| tree | a9f8eab53e6c2d12a818f95ac5b981f95e021e2f /extmod/modonewire.c | |
| parent | de3e83aa4d9b671e6c5581ce19f98aa06f96e255 (diff) | |
extmod/modonewire: Adopt Maxim recommended read timings.
The timing of the onewire module was way too fast when reading. This
commit adopts read timings as recommended in Maxim application note 126:
6 us (pulse) / 9 us (sample) / 55 us (bit slot). See also:
https://www.analog.com/en/technical-articles/1wire-communication-through-software.html
Signed-off-by: Damien George <damien@micropython.org>
Diffstat (limited to 'extmod/modonewire.c')
| -rw-r--r-- | extmod/modonewire.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/extmod/modonewire.c b/extmod/modonewire.c index f440f75a8..dbd519776 100644 --- a/extmod/modonewire.c +++ b/extmod/modonewire.c @@ -38,9 +38,9 @@ #define TIMING_RESET1 (480) #define TIMING_RESET2 (70) #define TIMING_RESET3 (410) -#define TIMING_READ1 (5) -#define TIMING_READ2 (5) -#define TIMING_READ3 (40) +#define TIMING_READ1 (6) +#define TIMING_READ2 (9) +#define TIMING_READ3 (55) #define TIMING_WRITE1 (10) #define TIMING_WRITE2 (50) #define TIMING_WRITE3 (10) |