Merge pull request #2618 from mubes/alignment-warning

Fix alignment warning

1 files changed, 8 insertions, 3 deletions

diff --git a/ports/mimxrt10xx/common-hal/microcontroller/Processor.c b/ports/mimxrt10xx/common-hal/microcontroller/Processor.c
index 23493f766..0c8131ef4 100644
--- a/ports/mimxrt10xx/common-hal/microcontroller/Processor.c
+++ b/ports/mimxrt10xx/common-hal/microcontroller/Processor.c
@@ -58,8 +58,13 @@ void common_hal_mcu_processor_get_uid(uint8_t raw_id[]) {
     OCOTP_Init(OCOTP, CLOCK_GetFreq(kCLOCK_IpgClk));
 
     // Reads shadow registers 0x01 - 0x04 (Configuration and Manufacturing Info)
-    for (int i = 0; i < 4; ++i)
-        ((uint32_t*) raw_id)[i] = OCOTP_ReadFuseShadowRegister(OCOTP, i + 1);
-
+    // into 8 bit wide destination, avoiding punning.
+    for (int i = 0; i < 4; ++i) {
+        uint32_t wr = OCOTP_ReadFuseShadowRegister(OCOTP, i + 1);
+        for (int j = 0; j < 4; j++) {
+            raw_id[i*4+j] = wr & 0xff;
+            wr >>= 8;
+        }
+    }
     OCOTP_Deinit(OCOTP);
 }