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rp2040: fix RP2350 hard fault in unaligned_memcpy to USB DPRAM #3585

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Merged
hathach merged 2 commits into from
Apr 3, 2026
+6 −2
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rp2040: fix RP2350 hard fault in unaligned_memcpy to USB DPRAM #3585

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rp2040: fix RP2350 hard fault in unaligned_memcpy to USB DPRAM
hathach Apr 2, 2026
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hathach Apr 2, 2026
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8 changes: 6 additions & 2 deletions src/portable/raspberrypi/rp2040/rp2040_usb.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,10 +51,14 @@ critical_section_t rp2usb_lock;
//--------------------------------------------------------------------+
// Implementation
//--------------------------------------------------------------------+
// Provide own byte by byte memcpy as not all copies are aligned
// Provide own byte by byte memcpy as not all copies are aligned.
// Use volatile to prevent compiler from widening to 16/32-bit accesses
// which cause hard fault on RP2350 when dst/src points to USB DPRAM.
static void unaligned_memcpy(uint8_t *dst, const uint8_t *src, size_t n) {
volatile uint8_t *vdst = dst;
const volatile uint8_t *vsrc = src;
while (n--) {
*dst++ = *src++;
*vdst++ = *vsrc++;
}
}

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