From 35d28e880d1f4e0ae67fa7a7403849f10a052cba Mon Sep 17 00:00:00 2001
From: bondus <liquidpontus@yahoo.se>
Date: Mon, 10 Aug 2020 03:07:59 +0200
Subject: stm32: Improvements to CAN bus ID generation. And added a small fast
 hash library (#3165)

Improved CAM bus ID generation, there were issues with ID collisions.
Added a small fast hash library.

Signed-off-by: Pontus Borg <liquidpontus@yahoo.se>
---
 src/stm32/can.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'src/stm32/can.c')

diff --git a/src/stm32/can.c b/src/stm32/can.c
index 7e3d75f1..d0e84908 100644
--- a/src/stm32/can.c
+++ b/src/stm32/can.c
@@ -15,6 +15,7 @@
 #include "sched.h" // DECL_INIT
 #include <string.h>
 #include "can.h"
+#include <fasthash.h>
 
 #if (CONFIG_CAN_PINS_PA11_PA12)
 DECL_CONSTANT_STR("RESERVE_PINS_CAN", "PA11,PA12");
@@ -151,10 +152,8 @@ static void can_transmit(uint32_t id, uint32_t dlc, uint8_t *pkt)
 // Convert Unique 96-bit value into 48 bit representation
 static void pack_uuid(uint8_t* u)
 {
-    for(int i=0; i<SHORT_UUID_LEN; i++) {
-        u[i] = *((uint8_t*)(UID_BASE+i)) ^
-                *((uint8_t*)(UID_BASE+i+SHORT_UUID_LEN));
-    }
+    uint64_t hash = fasthash64((uint8_t*)UID_BASE, 12, 0xA16231A7);
+    memcpy(u, &hash, SHORT_UUID_LEN);
 }
 
 static void can_uuid_resp(void)
-- 
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