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| author | Matthijs Kooijman <matthijs@stdin.nl> | 2015-01-26 17:04:26 +0100 |
|---|---|---|
| committer | Matthijs Kooijman <matthijs@stdin.nl> | 2015-01-26 17:04:26 +0100 |
| commit | 230f987ba6aa247f8b7ade116283161705e90406 (patch) | |
| tree | ea1bb5eb3e02bc1de56502bbb8e27fdd8281875d /bootloaders/stk500v2/command.h | |
| parent | 827c349a17e319d33f048ee402835bd40f9e42b6 (diff) | |
Prevent low pulse on TX initialization in SoftwareSerial
Previously, the TX pin would be set to output first and then written
high (assuming non-inverted logic). When the pin was previously
configured for input without pullup (which is normal reset state), this
results in driving the pin low for a short when initializing. This could
accidenttally be seen as a stop bit by the receiving side.
By first writing HIGH and then setting the mode to OUTPUT, the pin will
have its pullup enabled for a short while, which is harmless.
Diffstat (limited to 'bootloaders/stk500v2/command.h')
0 files changed, 0 insertions, 0 deletions