| /* |
| * Copyright (c) 2016, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holder nor the |
| * names of its contributors may be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| /** |
| * @file |
| * This file implements the OpenThread platform abstraction for the alarm. |
| * |
| */ |
| |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| #include <openthread/config.h> |
| #include <openthread/platform/alarm-milli.h> |
| #include <openthread/platform/diag.h> |
| |
| #include "platform-cc2538.h" |
| |
| enum |
| { |
| kSystemClock = 32000000, ///< MHz |
| kTicksPerSec = 1000, ///< Ticks per second |
| }; |
| |
| static uint32_t sCounter = 0; |
| static uint32_t sAlarmT0 = 0; |
| static uint32_t sAlarmDt = 0; |
| static bool sIsRunning = false; |
| |
| void cc2538AlarmInit(void) |
| { |
| HWREG(NVIC_ST_RELOAD) = kSystemClock / kTicksPerSec; |
| HWREG(NVIC_ST_CTRL) = NVIC_ST_CTRL_CLK_SRC | NVIC_ST_CTRL_INTEN | NVIC_ST_CTRL_ENABLE; |
| } |
| |
| uint32_t otPlatAlarmMilliGetNow(void) |
| { |
| return sCounter; |
| } |
| |
| void otPlatAlarmMilliStartAt(otInstance *aInstance, uint32_t t0, uint32_t dt) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| |
| sAlarmT0 = t0; |
| sAlarmDt = dt; |
| sIsRunning = true; |
| } |
| |
| void otPlatAlarmMilliStop(otInstance *aInstance) |
| { |
| OT_UNUSED_VARIABLE(aInstance); |
| |
| sIsRunning = false; |
| } |
| |
| void cc2538AlarmProcess(otInstance *aInstance) |
| { |
| uint32_t expires; |
| bool fire = false; |
| |
| if (sIsRunning) |
| { |
| expires = sAlarmT0 + sAlarmDt; |
| |
| if (sAlarmT0 <= sCounter) |
| { |
| if (expires >= sAlarmT0 && expires <= sCounter) |
| { |
| fire = true; |
| } |
| } |
| else |
| { |
| if (expires >= sAlarmT0 || expires <= sCounter) |
| { |
| fire = true; |
| } |
| } |
| |
| if (fire) |
| { |
| sIsRunning = false; |
| |
| #if OPENTHREAD_CONFIG_DIAG_ENABLE |
| |
| if (otPlatDiagModeGet()) |
| { |
| otPlatDiagAlarmFired(aInstance); |
| } |
| else |
| #endif |
| { |
| otPlatAlarmMilliFired(aInstance); |
| } |
| } |
| } |
| } |
| |
| void SysTick_Handler() |
| { |
| sCounter++; |
| } |