sam0_common: clarify memcpy in cpuid_get

2020-04-28 14:53:22 +02:00 · 2020-04-28 14:53:22 +02:00 · fe299138aa
commit fe299138aa
parent a0a4091b2a
1 changed files with 2 additions and 0 deletions
--- a/cpu/sam0_common/periph/cpuid.c
+++ b/cpu/sam0_common/periph/cpuid.c
@ -39,6 +39,8 @@

 void cpuid_get(void *id)
 {
+    /* Use memcpy to prevent unaligned access, which is not supported on
+     * cortex-m0+, to id */
    uint32_t addr[] = { WORD0, WORD1, WORD2, WORD3 };
    memcpy(id, &addr[0], CPUID_LEN);
 }