Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_NUVOTON/TARGET_NUC472/entropy_hardware_poll.c@147:ba84b7dc41a7, 2016-09-10 (annotated)

Committer:
JojoS
Date:
Sat Sep 10 15:32:04 2016 +0000
Revision:
147:ba84b7dc41a7
Parent:
144:ef7eb2e8f9f7 
added prescaler for 16 bit timers (solution as in LPC11xx), default prescaler 31 for max 28 ms period time

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /*
<> 144:ef7eb2e8f9f7 2 * Hardware entropy collector for NUC472's RNGA
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
<> 144:ef7eb2e8f9f7 5 * SPDX-License-Identifier: Apache-2.0
<> 144:ef7eb2e8f9f7 6 *
<> 144:ef7eb2e8f9f7 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
<> 144:ef7eb2e8f9f7 8 * not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 9 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 10 *
<> 144:ef7eb2e8f9f7 11 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 12 *
<> 144:ef7eb2e8f9f7 13 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
<> 144:ef7eb2e8f9f7 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 16 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 17 * limitations under the License.
<> 144:ef7eb2e8f9f7 18 *
<> 144:ef7eb2e8f9f7 19 */
<> 144:ef7eb2e8f9f7 20
<> 144:ef7eb2e8f9f7 21
<> 144:ef7eb2e8f9f7 22 #include <stdlib.h>
<> 144:ef7eb2e8f9f7 23 #include <string.h>
<> 144:ef7eb2e8f9f7 24 #include "cmsis.h"
<> 144:ef7eb2e8f9f7 25 #include "NUC472_442.h"
<> 144:ef7eb2e8f9f7 26 #include "us_ticker_api.h"
<> 144:ef7eb2e8f9f7 27
<> 144:ef7eb2e8f9f7 28 /*
<> 144:ef7eb2e8f9f7 29 * Get Random number generator.
<> 144:ef7eb2e8f9f7 30 */
<> 144:ef7eb2e8f9f7 31 static volatile int g_PRNG_done;
<> 144:ef7eb2e8f9f7 32
<> 144:ef7eb2e8f9f7 33 void CRYPTO_IRQHandler()
<> 144:ef7eb2e8f9f7 34 {
<> 144:ef7eb2e8f9f7 35 if (PRNG_GET_INT_FLAG()) {
<> 144:ef7eb2e8f9f7 36 g_PRNG_done = 1;
<> 144:ef7eb2e8f9f7 37 PRNG_CLR_INT_FLAG();
<> 144:ef7eb2e8f9f7 38 }
<> 144:ef7eb2e8f9f7 39 }
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 static void rng_get(unsigned char *pConversionData)
<> 144:ef7eb2e8f9f7 42 {
<> 144:ef7eb2e8f9f7 43 uint32_t *p32ConversionData;
<> 144:ef7eb2e8f9f7 44
<> 144:ef7eb2e8f9f7 45 p32ConversionData = (uint32_t *)pConversionData;
<> 144:ef7eb2e8f9f7 46
<> 144:ef7eb2e8f9f7 47 /* Unlock protected registers */
<> 144:ef7eb2e8f9f7 48 SYS_UnlockReg();
<> 144:ef7eb2e8f9f7 49 /* Enable IP clock */
<> 144:ef7eb2e8f9f7 50 CLK_EnableModuleClock(CRPT_MODULE);
<> 144:ef7eb2e8f9f7 51
<> 144:ef7eb2e8f9f7 52 /* Lock protected registers */
<> 144:ef7eb2e8f9f7 53 SYS_LockReg();
<> 144:ef7eb2e8f9f7 54
<> 144:ef7eb2e8f9f7 55 NVIC_EnableIRQ(CRPT_IRQn);
<> 144:ef7eb2e8f9f7 56 PRNG_ENABLE_INT();
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 // PRNG_Open(PRNG_KEY_SIZE_64, 0, 0);
<> 144:ef7eb2e8f9f7 59 PRNG_Open(PRNG_KEY_SIZE_256, 1, us_ticker_read());
<> 144:ef7eb2e8f9f7 60 PRNG_Start();
<> 144:ef7eb2e8f9f7 61 while (!g_PRNG_done);
<> 144:ef7eb2e8f9f7 62
<> 144:ef7eb2e8f9f7 63
<> 144:ef7eb2e8f9f7 64 PRNG_Read(p32ConversionData);
<> 144:ef7eb2e8f9f7 65
<> 144:ef7eb2e8f9f7 66 // printf(" 0x%08x 0x%08x 0x%08x 0x%08x\n\r", *p32ConversionData, *(p32ConversionData+1), *(p32ConversionData+2), *(p32ConversionData+3));
<> 144:ef7eb2e8f9f7 67 // printf(" 0x%08x 0x%08x 0x%08x 0x%08x\n\r", *(p32ConversionData+4), *(p32ConversionData+5), *(p32ConversionData+6), *(p32ConversionData+7));
<> 144:ef7eb2e8f9f7 68
<> 144:ef7eb2e8f9f7 69 PRNG_DISABLE_INT();
<> 144:ef7eb2e8f9f7 70 NVIC_DisableIRQ(CRPT_IRQn);
<> 144:ef7eb2e8f9f7 71 // CLK_DisableModuleClock(CRPT_MODULE);
<> 144:ef7eb2e8f9f7 72
<> 144:ef7eb2e8f9f7 73 }
<> 144:ef7eb2e8f9f7 74
<> 144:ef7eb2e8f9f7 75
<> 144:ef7eb2e8f9f7 76 /*
<> 144:ef7eb2e8f9f7 77 * Get len bytes of entropy from the hardware RNG.
<> 144:ef7eb2e8f9f7 78 */
<> 144:ef7eb2e8f9f7 79
<> 144:ef7eb2e8f9f7 80 int mbedtls_hardware_poll( void *data,
<> 144:ef7eb2e8f9f7 81 unsigned char *output, size_t len, size_t *olen )
<> 144:ef7eb2e8f9f7 82 {
<> 144:ef7eb2e8f9f7 83 #if 0
<> 144:ef7eb2e8f9f7 84 unsigned long timer = us_ticker_read();
<> 144:ef7eb2e8f9f7 85 ((void) data);
<> 144:ef7eb2e8f9f7 86 *olen = 0;
<> 144:ef7eb2e8f9f7 87
<> 144:ef7eb2e8f9f7 88 if( len < sizeof(unsigned long) )
<> 144:ef7eb2e8f9f7 89 return( 0 );
<> 144:ef7eb2e8f9f7 90
<> 144:ef7eb2e8f9f7 91 memcpy( output, &timer, sizeof(unsigned long) );
<> 144:ef7eb2e8f9f7 92 *olen = sizeof(unsigned long);
<> 144:ef7eb2e8f9f7 93 #else
<> 144:ef7eb2e8f9f7 94 *olen = 0;
<> 144:ef7eb2e8f9f7 95 if( len < 32 )
<> 144:ef7eb2e8f9f7 96 {
<> 144:ef7eb2e8f9f7 97 unsigned char tmpBuff[32];
<> 144:ef7eb2e8f9f7 98 rng_get(tmpBuff);
<> 144:ef7eb2e8f9f7 99 memcpy( output, &tmpBuff, len );
<> 144:ef7eb2e8f9f7 100 *olen = len;
<> 144:ef7eb2e8f9f7 101 return( 0 );
<> 144:ef7eb2e8f9f7 102 }
<> 144:ef7eb2e8f9f7 103 for( int i = 0; i < (len/32) ; i++)
<> 144:ef7eb2e8f9f7 104 {
<> 144:ef7eb2e8f9f7 105 rng_get(output);
<> 144:ef7eb2e8f9f7 106 *olen += 32;
<> 144:ef7eb2e8f9f7 107 // printf("Output result of len[%d][%d]: 0x%08x 0x%08x\n\r", len, *olen, *((int32_t *)output), *(((int32_t *)output)+1));
<> 144:ef7eb2e8f9f7 108 output += 32;
<> 144:ef7eb2e8f9f7 109 }
<> 144:ef7eb2e8f9f7 110 #endif
<> 144:ef7eb2e8f9f7 111
<> 144:ef7eb2e8f9f7 112 return( 0 );
<> 144:ef7eb2e8f9f7 113 }
<> 144:ef7eb2e8f9f7 114
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116