| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 "os/mynewt.h" |
| #include <mcu/cortex_m0.h> |
| #include "hal/hal_system.h" |
| #include <nrf51.h> |
| #include <nrf51_bitfields.h> |
| |
| /** |
| * Function called at startup. Called after BSS and .data initialized but |
| * prior to the _start function. |
| * |
| * NOTE: this function is called by both the bootloader and the application. |
| * If you add code here that you do not want executed in either case you need |
| * to conditionally compile it using the config variable BOOT_LOADER (will |
| * be set to 1 in case of bootloader build) |
| * |
| */ |
| void |
| hal_system_init(void) |
| { |
| #if MYNEWT_VAL(MCU_DCDC_ENABLED) |
| NRF_POWER->DCDCEN = 1; |
| #endif |
| } |
| |
| void |
| hal_system_reset(void) |
| { |
| while (1) { |
| NVIC_SystemReset(); |
| } |
| } |
| |
| int |
| hal_debugger_connected(void) |
| { |
| /* XXX is there a way? */ |
| return 0; |
| } |
| |
| /** |
| * hal system clock start |
| * |
| * Makes sure the LFCLK and/or HFCLK is started. |
| */ |
| void |
| hal_system_clock_start(void) |
| { |
| #if MYNEWT_VAL(XTAL_32768) || MYNEWT_VAL(XTAL_RC) || \ |
| MYNEWT_VAL(XTAL_32768_SYNTH) |
| uint32_t regmsk; |
| uint32_t regval; |
| uint32_t clksrc; |
| |
| regmsk = CLOCK_LFCLKSTAT_STATE_Msk | CLOCK_LFCLKSTAT_SRC_Msk; |
| regval = CLOCK_LFCLKSTAT_STATE_Running << CLOCK_LFCLKSTAT_STATE_Pos; |
| |
| #if MYNEWT_VAL(XTAL_32768) |
| regval |= CLOCK_LFCLKSTAT_SRC_Xtal << CLOCK_LFCLKSTAT_SRC_Pos; |
| clksrc = CLOCK_LFCLKSRC_SRC_Xtal; |
| #endif |
| |
| #if MYNEWT_VAL(XTAL_32768_SYNTH) |
| regval |= CLOCK_LFCLKSTAT_SRC_Synth << CLOCK_LFCLKSTAT_SRC_Pos; |
| clksrc = CLOCK_LFCLKSRC_SRC_Synth; |
| #endif |
| |
| #if MYNEWT_VAL(XTAL_RC) |
| regval |= CLOCK_LFCLKSTAT_SRC_RC << CLOCK_LFCLKSTAT_SRC_Pos; |
| clksrc = CLOCK_LFCLKSRC_SRC_RC; |
| #endif |
| |
| |
| #if MYNEWT_VAL(XTAL_32768_SYNTH) |
| /* Must turn on HFLCK for synthesized 32768 crystal */ |
| if ((NRF_CLOCK->HFCLKSTAT & CLOCK_HFCLKSTAT_STATE_Msk) != |
| (CLOCK_HFCLKSTAT_STATE_Running << CLOCK_HFCLKSTAT_STATE_Pos)) { |
| NRF_CLOCK->EVENTS_HFCLKSTARTED = 0; |
| NRF_CLOCK->TASKS_HFCLKSTART = 1; |
| while (1) { |
| if ((NRF_CLOCK->EVENTS_HFCLKSTARTED) != 0) { |
| break; |
| } |
| } |
| } |
| #endif |
| |
| /* Check if this clock source is already running */ |
| if ((NRF_CLOCK->LFCLKSTAT & regmsk) != regval) { |
| NRF_CLOCK->TASKS_LFCLKSTOP = 1; |
| NRF_CLOCK->EVENTS_LFCLKSTARTED = 0; |
| NRF_CLOCK->LFCLKSRC = clksrc; |
| NRF_CLOCK->TASKS_LFCLKSTART = 1; |
| |
| /* Wait here till started! */ |
| while (1) { |
| if (NRF_CLOCK->EVENTS_LFCLKSTARTED) { |
| if ((NRF_CLOCK->LFCLKSTAT & regmsk) == regval) { |
| break; |
| } |
| } |
| } |
| } |
| #endif |
| } |