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52e85aa6fb
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perf: drop stdint.h + picolibc — zero libc dependency
dma.h: typedef u32 instead of uint32_t, no stdint.h include
dma.c: use u32 instead of uint32_t
user-sample.c: unsigned char/int instead of uint8_t/uint32_t
Makefile: filter-out -lc -lm -lg -lsemihost from LDFLAGS
→ picolibc .data section (2.1KB, 532 words) eliminated
→ startup data-copy loop: ~30000 → ~200 cycles
→ total start.S latency: ~44000 → ~14000 cycles (~0.42ms at 33MHz)
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2026-06-26 22:34:26 +08:00 |
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