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annotate target-utils/libcommon/defgetchar.c @ 609:ffd606adb039

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CHANGES: libserial ASYNC_LOW_LATENCY change documented
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 22 Feb 2020 19:07:46 +0000
parents f9d2ce6591b7
children
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f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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2 * The interactive command entry (editing) function in libcommon
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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3 * will call mygetchar() for its character input. It is supposed
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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4 * to be a blocking wait for input, but in some programs other
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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5 * processing can be done while waiting - for example, check for
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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6 * keypad presses as well. This is the basic version which waits
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
Mychaela Falconia <falcon@freecalypso.org>
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7 * for serial input and nothing else - specific programs can
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
Mychaela Falconia <falcon@freecalypso.org>
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8 * override it if necessary, but this library version is the default.
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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9 */
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10
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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11 extern int serial_in_poll();
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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12
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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13 int
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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14 mygetchar()
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15 {
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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16 register int c;
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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17
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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18 do
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19 c = serial_in_poll();
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20 while (c < 0);
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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21 return c;
f9d2ce6591b7 target-utils: default mygetchar() added to libcommon
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22 }