8785645a95
The port currently implements support for GPIO, RTC, ExtInt and the WiFi subsystem. A small file system is available in the serial flash. A bootloader which makes OTA updates possible, is also part of this initial implementation.
115 lines
3.6 KiB
C
115 lines
3.6 KiB
C
/*
|
|
* This file is part of the Micro Python project, http://micropython.org/
|
|
*
|
|
* The MIT License (MIT)
|
|
*
|
|
* Copyright (c) 2015 Daniel Campora
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <stdbool.h>
|
|
|
|
#include "inc/hw_types.h"
|
|
#include "inc/hw_ints.h"
|
|
#include "inc/hw_memmap.h"
|
|
#include "rom_map.h"
|
|
#include "prcm.h"
|
|
#include "simplelink.h"
|
|
#include "modwlan.h"
|
|
#include "py/obj.h"
|
|
#include "random.h"
|
|
|
|
|
|
/******************************************************************************
|
|
* LOCAL TYPES
|
|
******************************************************************************/
|
|
typedef union Id_t {
|
|
uint32_t id32;
|
|
uint16_t id16[3];
|
|
uint8_t id8[6];
|
|
} Id_t;
|
|
|
|
/******************************************************************************
|
|
* LOCAL VARIABLES
|
|
******************************************************************************/
|
|
static uint32_t s_seed;
|
|
|
|
/******************************************************************************
|
|
* LOCAL FUNCTION DECLARATIONS
|
|
******************************************************************************/
|
|
static uint32_t lfsr (uint32_t input);
|
|
|
|
/******************************************************************************
|
|
* PRIVATE FUNCTIONS
|
|
******************************************************************************/
|
|
static uint32_t lfsr (uint32_t input) {
|
|
assert( input != 0 );
|
|
|
|
/*lint -save -e501*/
|
|
return (input >> 1) ^ (-(input & 0x01) & 0x00E10000);
|
|
/*lint -restore*/
|
|
}
|
|
|
|
#if MICROPY_HW_ENABLE_RNG
|
|
/// \moduleref rng
|
|
|
|
/// \function rng()
|
|
/// Return a 24-bit hardware generated random number.
|
|
STATIC mp_obj_t pyb_rng_get(void) {
|
|
return mp_obj_new_int(rng_get());
|
|
}
|
|
|
|
MP_DEFINE_CONST_FUN_OBJ_0(pyb_rng_get_obj, pyb_rng_get);
|
|
#endif
|
|
|
|
/******************************************************************************
|
|
* PUBLIC FUNCTIONS
|
|
******************************************************************************/
|
|
void rng_init0 (void) {
|
|
Id_t juggler;
|
|
uint32_t seconds;
|
|
uint16_t mseconds;
|
|
|
|
// get the seconds and the milliseconds from the RTC
|
|
MAP_PRCMRTCGet(&seconds, &mseconds);
|
|
|
|
wlan_get_mac (juggler.id8);
|
|
|
|
// Flatten the 48-bit board identification to 24 bits
|
|
juggler.id16[0] ^= juggler.id16[2];
|
|
|
|
juggler.id8[0] ^= juggler.id8[3];
|
|
juggler.id8[1] ^= juggler.id8[4];
|
|
juggler.id8[2] ^= juggler.id8[5];
|
|
|
|
s_seed = juggler.id32 & 0x00FFFFFF;
|
|
s_seed += (seconds & 0x000FFFFF) + mseconds;
|
|
// The seed must not be zero
|
|
if (s_seed == 0) {
|
|
s_seed = 1;
|
|
}
|
|
}
|
|
|
|
uint32_t rng_get (void) {
|
|
s_seed = lfsr( s_seed );
|
|
return s_seed;
|
|
}
|