FreeCalypso > hg > freecalypso-tools
annotate target-utils/flash-boot-test/mygetchar.c @ 407:19e5a3e2f9c0
fcup-settime: moved time() retrieval a little closer to the output
A fundamental problem with all simple time transfer tools is that there is
always some delay between the time retrieval on the source system and that
transmitted time being set on the destination, and the resulting time
on the destination system is off by that delay amount. This delay cannot
be fully eliminated when working in a simple environment like ours,
but we should make our best effort to minimize it. In the present case,
moving the atinterf_init() call before the time() retrieval should make
a teensy-tiny improvement.
author | Mychaela Falconia <falcon@freecalypso.org> |
---|---|
date | Sat, 11 Aug 2018 21:52:17 +0000 |
parents | dbb54db721d1 |
children |
rev | line source |
---|---|
197
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
1 /* |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
2 * The interactive command entry (editing) function in libcommon |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
3 * will call mygetchar() for its character input. It is supposed |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
4 * to be a blocking wait for input, but in some programs other |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
5 * processing can be done while waiting - for example, check for |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
6 * keypad presses as well. This is the basic version which waits |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
7 * for serial input and nothing else. |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
8 */ |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
9 |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
10 extern int serial_in_poll(); |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
11 |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
12 int |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
13 mygetchar() |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
14 { |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
15 register int c; |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
16 |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
17 do |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
18 c = serial_in_poll(); |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
19 while (c < 0); |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
20 return c; |
dbb54db721d1
target-utils/flash-boot-test written
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff
changeset
|
21 } |