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atmel-samd: Ensure MTB is off in case we ran a debug build before #239

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Merged
tannewt merged 1 commit into from
Sep 6, 2017
Merged

atmel-samd: Ensure MTB is off in case we ran a debug build before #239

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4 changes: 4 additions & 0 deletions atmel-samd/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -513,6 +513,10 @@ safe_mode_t samd21_init(void) {
REG_MTB_POSITION = ((uint32_t) (mtb - REG_MTB_BASE)) & 0xFFFFFFF8;
REG_MTB_FLOW = (((uint32_t) mtb - REG_MTB_BASE) + TRACE_BUFFER_SIZE_BYTES) & 0xFFFFFFF8;
REG_MTB_MASTER = 0x80000000 + (TRACE_BUFFER_MAGNITUDE_PACKETS - 1);
#else
// Triple check that the MTB is off. Switching between debug and non-debug
// builds can leave it set over reset and wreak havok as a result.
REG_MTB_MASTER = 0x00000000 + 6;
#endif

// On power on start or external reset, set _ezero to the canary word. If it
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