/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "gpio_api.h" #define CRC16 #include "crc.h" #include "fsl_rtc.h" #include "fsl_clock_config.h" // called before main void mbed_sdk_init() { rtc_config_t rtc_basic_config; uint32_t u32cTPR_counter = 0; BOARD_BootClockRUN(); CLOCK_EnableClock(kCLOCK_Rtc0); /* Check if the Rtc oscillator is enabled */ if ((RTC->CR & RTC_CR_OSCE_MASK) == 0u) { /*Init the RTC with default configuration*/ RTC_GetDefaultConfig(&rtc_basic_config); /* Setup the 32K RTC OSC */ RTC_Init(RTC, &rtc_basic_config); /* Enable the RTC 32KHz oscillator */ RTC->CR |= RTC_CR_OSCE_MASK; /* Start the RTC time counter */ RTC_StartTimer(RTC); /* Verify TPR register reaches 4096 counts */ while (u32cTPR_counter < 4096) { u32cTPR_counter = RTC->TPR; } /* 32kHz Oscillator is ready. */ RTC_Deinit(RTC); } CLOCK_DisableClock(kCLOCK_Rtc0); } // Change the NMI pin to an input. This allows NMI pin to // be used as a low power mode wakeup. The application will // need to change the pin back to NMI_b or wakeup only occurs once! void NMI_Handler(void) { gpio_t gpio; gpio_init_in(&gpio, PTA4); } // Provide ethernet devices with a semi-unique MAC address from the UUID void mbed_mac_address(char *mac) { uint16_t MAC[3]; // 3 16 bits words for the MAC // get UID via SIM_UID macros defined in the K64F MCU CMSIS header file uint32_t UID[4]; UID[0] = SIM->UIDH; UID[1] = SIM->UIDMH; UID[2] = SIM->UIDML; UID[3] = SIM->UIDL; // generate three CRC16's using different slices of the UUID MAC[0] = crcSlow((const uint8_t *)UID, 8); // most significant half-word MAC[1] = crcSlow((const uint8_t *)UID, 12); MAC[2] = crcSlow((const uint8_t *)UID, 16); // least significant half word // The network stack expects an array of 6 bytes // so we copy, and shift and copy from the half-word array to the byte array mac[0] = MAC[0] >> 8; mac[1] = MAC[0]; mac[2] = MAC[1] >> 8; mac[3] = MAC[1]; mac[4] = MAC[2] >> 8; mac[5] = MAC[2]; // We want to force bits [1:0] of the most significant byte [0] // to be "10" // http://en.wikipedia.org/wiki/MAC_address mac[0] |= 0x02; // force bit 1 to a "1" = "Locally Administered" mac[0] &= 0xFE; // force bit 0 to a "0" = Unicast }