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annotate target-utils/libprintf/README @ 964:a96cb97b66a2

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ringtools/imy: fix duplicate definition of tdma_durations[] The bug was reported by Vadim Yanitskiy <fixeria@osmocom.org>, although the present fix is slightly different from the contributed patch: because main.c doesn't need this tdma_durations[] array at all, let's simply remove the reference to this array from main.c rather than turn it into an extern. I no longer remember my original thought flow that resulted (by mistake) in tdma_durations[] being multiply defined in main.c and durations.c. My intent might have been to define all globals in main.c and have the reference in durations.c be an extern - and I missed that extern - but without clear memory, I have no certainty. In any case, having this data array defined in the same module that fills it (durations.c) is sensible, so let's make it the new way.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 31 Aug 2023 19:38:18 +0000
parents e7502631a0f9
children
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e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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1 The present libprintf is a very light printf implementation that is well-suited
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Mychaela Falconia <falcon@freecalypso.org>
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2 for simple bare-metal programs like loadagent; in the present case it overrides
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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3 the much heavier printf implementation in newlib. Programs like the present
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4 loadagent only need printf in order to scribble on the serial console port,
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Mychaela Falconia <falcon@freecalypso.org>
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5 and the most sensible implementation is to have the "character output" function
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Mychaela Falconia <falcon@freecalypso.org>
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6 from the guts of printf point directly to the physical UART output routine, or
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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7 a trivial wrapper that turns \n into \r\n. In contrast, newlib's version would
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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8 pull in the complete FILE table infrastructure and malloc etc - maybe OK for
e7502631a0f9 initial import from freecalypso-sw rev 1033:5ab737ac3ad7
Mychaela Falconia <falcon@freecalypso.org>
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9 more complex embedded programs that use those facilities for other things under
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10 a bona fide RTOS, but it would be disgusting to pull that stuff in for a
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Mychaela Falconia <falcon@freecalypso.org>
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11 minimal program like ours.
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13 The present printf implementation has been used earlier by the same author
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14 (Michael Spacefalcon) in the StarMON family of PowerPC bootloaders, and in my
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15 MC68x302-based SDSL CPE devices (Hack-o-Rocket and OSDCU).