macros: add lowcode arg to interrupt for opting out of .highcode - #24
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Adds a
lowcodearg to#[interrupt]so individual handlers can opt out of.highcode(RAM) placement when thehighcodefeature is enabled. Body and trampoline land in.text.{NAME}(flash) instead of.trap.rust; the linker's existing*(.text .text.*)catches both. Composes withcore. No-op when thehighcodefeature is off.Motivation: on small-SRAM chips (e.g. V006, 8 KB), having every
#[interrupt]forced into.highcodeconsumes RAM that's only justified for hot path handlers.No linker-script changes. No breaking changes to existing
#[interrupt]/#[interrupt(core)]usage.