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stm32: Improvements to CAN bus ID generation. And added a small fast hash library (#3165)

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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>
This commit is contained in:
bondus
2020-08-10 03:07:59 +02:00
committed by GitHub
parent 04bd48ca9d
commit 35d28e880d
5 changed files with 142 additions and 6 deletions
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7
src/stm32/can.c
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@@ -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)