takashi kadono / Mbed OS Nucleo446_SSD1331

Color Oled(SSD1331) connect to STMicroelectronics Nucleo-F466

Dependencies:   ssd1331

mbed-os/targets/TARGET_Freescale/TARGET_MCUXpresso_MCUS/TARGET_MCU_K64F/trng_api.c@0:8fdf9a60065b, 2018-10-10 (annotated)

Committer:
kadonotakashi
Date:
Wed Oct 10 00:33:53 2018 +0000
Revision:
0:8fdf9a60065b
how to make mbed librry

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kadonotakashi 0:8fdf9a60065b 1 /*
kadonotakashi 0:8fdf9a60065b 2 * Hardware entropy collector for the K64F, using Freescale's RNGA
kadonotakashi 0:8fdf9a60065b 3 *
kadonotakashi 0:8fdf9a60065b 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kadonotakashi 0:8fdf9a60065b 5 * SPDX-License-Identifier: Apache-2.0
kadonotakashi 0:8fdf9a60065b 6 *
kadonotakashi 0:8fdf9a60065b 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kadonotakashi 0:8fdf9a60065b 8 * not use this file except in compliance with the License.
kadonotakashi 0:8fdf9a60065b 9 * You may obtain a copy of the License at
kadonotakashi 0:8fdf9a60065b 10 *
kadonotakashi 0:8fdf9a60065b 11 * http://www.apache.org/licenses/LICENSE-2.0
kadonotakashi 0:8fdf9a60065b 12 *
kadonotakashi 0:8fdf9a60065b 13 * Unless required by applicable law or agreed to in writing, software
kadonotakashi 0:8fdf9a60065b 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kadonotakashi 0:8fdf9a60065b 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kadonotakashi 0:8fdf9a60065b 16 * See the License for the specific language governing permissions and
kadonotakashi 0:8fdf9a60065b 17 * limitations under the License.
kadonotakashi 0:8fdf9a60065b 18 *
kadonotakashi 0:8fdf9a60065b 19 */
kadonotakashi 0:8fdf9a60065b 20
kadonotakashi 0:8fdf9a60065b 21 /*
kadonotakashi 0:8fdf9a60065b 22 * Reference: "K64 Sub-Family Reference Manual, Rev. 2", chapter 34
kadonotakashi 0:8fdf9a60065b 23 */
kadonotakashi 0:8fdf9a60065b 24
kadonotakashi 0:8fdf9a60065b 25 #if defined(DEVICE_TRNG)
kadonotakashi 0:8fdf9a60065b 26
kadonotakashi 0:8fdf9a60065b 27 #include <stdlib.h>
kadonotakashi 0:8fdf9a60065b 28 #include "cmsis.h"
kadonotakashi 0:8fdf9a60065b 29 #include "fsl_common.h"
kadonotakashi 0:8fdf9a60065b 30 #include "fsl_clock.h"
kadonotakashi 0:8fdf9a60065b 31 #include "trng_api.h"
kadonotakashi 0:8fdf9a60065b 32
kadonotakashi 0:8fdf9a60065b 33 void trng_init(trng_t *obj)
kadonotakashi 0:8fdf9a60065b 34 {
kadonotakashi 0:8fdf9a60065b 35 (void)obj;
kadonotakashi 0:8fdf9a60065b 36 CLOCK_EnableClock(kCLOCK_Rnga0);
kadonotakashi 0:8fdf9a60065b 37 CLOCK_DisableClock(kCLOCK_Rnga0);
kadonotakashi 0:8fdf9a60065b 38 CLOCK_EnableClock(kCLOCK_Rnga0);
kadonotakashi 0:8fdf9a60065b 39 }
kadonotakashi 0:8fdf9a60065b 40
kadonotakashi 0:8fdf9a60065b 41 void trng_free(trng_t *obj)
kadonotakashi 0:8fdf9a60065b 42 {
kadonotakashi 0:8fdf9a60065b 43 (void)obj;
kadonotakashi 0:8fdf9a60065b 44 CLOCK_DisableClock(kCLOCK_Rnga0);
kadonotakashi 0:8fdf9a60065b 45 }
kadonotakashi 0:8fdf9a60065b 46
kadonotakashi 0:8fdf9a60065b 47 /*
kadonotakashi 0:8fdf9a60065b 48 * Get one byte of entropy from the RNG, assuming it is up and running.
kadonotakashi 0:8fdf9a60065b 49 * As recommended (34.1.1), get only one bit of each output.
kadonotakashi 0:8fdf9a60065b 50 */
kadonotakashi 0:8fdf9a60065b 51 static void trng_get_byte(unsigned char *byte)
kadonotakashi 0:8fdf9a60065b 52 {
kadonotakashi 0:8fdf9a60065b 53 *byte = 0;
kadonotakashi 0:8fdf9a60065b 54 size_t bit;
kadonotakashi 0:8fdf9a60065b 55
kadonotakashi 0:8fdf9a60065b 56 /* 34.5 Steps 3-4-5: poll SR and read from OR when ready */
kadonotakashi 0:8fdf9a60065b 57 for( bit = 0; bit < 8; bit++ )
kadonotakashi 0:8fdf9a60065b 58 {
kadonotakashi 0:8fdf9a60065b 59 while((RNG->SR & RNG_SR_OREG_LVL_MASK) == 0 );
kadonotakashi 0:8fdf9a60065b 60 *byte |= (RNG->OR & 1) << bit;
kadonotakashi 0:8fdf9a60065b 61 }
kadonotakashi 0:8fdf9a60065b 62 }
kadonotakashi 0:8fdf9a60065b 63
kadonotakashi 0:8fdf9a60065b 64 int trng_get_bytes(trng_t *obj, uint8_t *output, size_t length, size_t *output_length)
kadonotakashi 0:8fdf9a60065b 65 {
kadonotakashi 0:8fdf9a60065b 66 (void)obj;
kadonotakashi 0:8fdf9a60065b 67 size_t i;
kadonotakashi 0:8fdf9a60065b 68
kadonotakashi 0:8fdf9a60065b 69 /* Set "Interrupt Mask", "High Assurance" and "Go",
kadonotakashi 0:8fdf9a60065b 70 * unset "Clear interrupt" and "Sleep" */
kadonotakashi 0:8fdf9a60065b 71 RNG->CR = RNG_CR_INTM_MASK | RNG_CR_HA_MASK | RNG_CR_GO_MASK;
kadonotakashi 0:8fdf9a60065b 72
kadonotakashi 0:8fdf9a60065b 73 for (i = 0; i < length; i++) {
kadonotakashi 0:8fdf9a60065b 74 trng_get_byte(output + i);
kadonotakashi 0:8fdf9a60065b 75 }
kadonotakashi 0:8fdf9a60065b 76
kadonotakashi 0:8fdf9a60065b 77 /* Just be extra sure that we didn't do it wrong */
kadonotakashi 0:8fdf9a60065b 78 if ((RNG->SR & RNG_SR_SECV_MASK) != 0) {
kadonotakashi 0:8fdf9a60065b 79 return -1;
kadonotakashi 0:8fdf9a60065b 80 }
kadonotakashi 0:8fdf9a60065b 81
kadonotakashi 0:8fdf9a60065b 82 *output_length = length;
kadonotakashi 0:8fdf9a60065b 83
kadonotakashi 0:8fdf9a60065b 84 return 0;
kadonotakashi 0:8fdf9a60065b 85 }
kadonotakashi 0:8fdf9a60065b 86
kadonotakashi 0:8fdf9a60065b 87 #endif