mirror of
https://github.com/RIOT-OS/RIOT.git
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241 lines
7.7 KiB
Diff
241 lines
7.7 KiB
Diff
*** stock_iot-lab_M3/openwsn/radiotimer.c Thu Apr 24 11:19:40 2014
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--- riot-openwsn-wip/openwsn/radiotimer.c Thu Apr 24 16:55:54 2014
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***************
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*** 0 ****
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--- 1,235 ----
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+ /**
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+ \brief openmoteSTM32 definition of the "radiotimer" bsp module.
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+
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+ On openmoteSTM32, we use RTC for the radiotimer module.
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+
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+ \author Thomas Watteyne <watteyne@eecs.berkeley.edu>, February 2012.
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+ \author Chang Tengfei <tengfei.chang@gmail.com>, July 2012.
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+ */
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+
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+ #include "stdint.h"
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+
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+ #include "stm32f10x_lib.h"
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+ #include "leds_ow.h"
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+ #include "radiotimer.h"
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+ #include "board_info.h"
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+
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+ #include "rcc.h"
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+ #include "nvic.h"
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+
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+ #define ENABLE_DEBUG (0)
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+ #include "debug.h"
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+
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+
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+ //=========================== variables =======================================
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+
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+ enum radiotimer_irqstatus_enum{
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+ RADIOTIMER_NONE = 0x00, //alarm interrupt default status
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+ RADIOTIMER_OVERFLOW = 0x01, //alarm interrupt caused by overflow
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+ RADIOTIMER_COMPARE = 0x02, //alarm interrupt caused by compare
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+ };
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+
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+ typedef struct {
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+ radiotimer_compare_cbt overflow_cb;
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+ radiotimer_compare_cbt compare_cb;
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+ uint8_t overflowORcompare;//indicate RTC alarm interrupt status
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+ uint16_t currentSlotPeriod;
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+ } radiotimer_vars_t;
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+
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+ volatile radiotimer_vars_t radiotimer_vars;
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+
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+ //=========================== prototypes ======================================
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+
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+ //=========================== public ==========================================
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+
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+ //===== admin
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+
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+ void radiotimer_init() {
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+ // clear local variables
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+ memset((void*)&radiotimer_vars,0,sizeof(radiotimer_vars_t));
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+ }
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+
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+ void radiotimer_setOverflowCb(radiotimer_compare_cbt cb) {
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+ radiotimer_vars.overflow_cb = cb;
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+ }
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+
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+ void radiotimer_setCompareCb(radiotimer_compare_cbt cb) {
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+ radiotimer_vars.compare_cb = cb;
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+ }
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+
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+ void radiotimer_setStartFrameCb(radiotimer_capture_cbt cb) {
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+ while(1);
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+ }
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+
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+ void radiotimer_setEndFrameCb(radiotimer_capture_cbt cb) {
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+ while(1);
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+ }
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+
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+ void radiotimer_start(uint16_t period) {
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+ //enable BKP and PWR, Clock
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+ RCC_APB1PeriphClockCmd(RCC_APB1Periph_BKP|RCC_APB1Periph_PWR , ENABLE);
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+
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+ // RTC clock source configuration
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+ PWR_BackupAccessCmd(ENABLE); //Allow access to BKP Domain
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+ RCC_LSEConfig(RCC_LSE_ON); //Enable LSE OSC
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+ while(RCC_GetFlagStatus(RCC_FLAG_LSERDY)==RESET); //Wait till LSE is ready
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+ RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE); //Select the RTC Clock Source
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+ RCC_RTCCLKCmd(ENABLE); //enable RTC
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+
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+ // RTC configuration
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+ // Wait for RTC APB registers synchronisation
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+ RTC_WaitForSynchro();
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+
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+ RTC_SetPrescaler(1); //use 16KHz clock
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+ RTC_WaitForLastTask(); //Wait until last write operation on RTC registers has finished
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+
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+ //Set the RTC time counter to 0
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+ RTC_SetCounter(0);
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+ RTC_WaitForLastTask();
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+
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+ // Set the RTC time alarm(the length of slot)
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+ RTC_SetAlarm(period);
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+ RTC_WaitForLastTask();
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+
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+ radiotimer_vars.currentSlotPeriod = period;
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+
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+ //interrupt when reach alarm value
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+ RTC_ClearFlag(RTC_IT_ALR);
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+ RTC_ITConfig(RTC_IT_ALR, ENABLE);
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+
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+ //set radiotimer irpstatus
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+ radiotimer_vars.overflowORcompare = RADIOTIMER_OVERFLOW;
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+
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+ //Configures EXTI line 17 to generate an interrupt on rising edge(alarm interrupt to wakeup board)
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+ EXTI_ClearITPendingBit(EXTI_Line17);
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+ EXTI_InitTypeDef EXTI_InitStructure;
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+ EXTI_InitStructure.EXTI_Line = EXTI_Line17;
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+ EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
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+ EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
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+ EXTI_InitStructure.EXTI_LineCmd = ENABLE;
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+ EXTI_Init(&EXTI_InitStructure);
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+
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+ //Configure RTC Alarm interrupt:
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+ //Configure NVIC: Preemption Priority = 1 and Sub Priority = 0
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+ NVIC_InitTypeDef NVIC_InitStructure;
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+ NVIC_InitStructure.NVIC_IRQChannel = RTCAlarm_IRQn;
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+ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
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+ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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+ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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+ NVIC_Init(&NVIC_InitStructure);
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+ }
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+
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+ //===== direct access
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+
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+ uint16_t radiotimer_getValue() {
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+ RTC_WaitForSynchro();
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+ uint32_t counter = RTC_GetCounter();
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+ return (uint16_t)counter;
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+ }
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+
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+ void radiotimer_setPeriod(uint16_t period) {
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+
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+ RTC_ITConfig(RTC_IT_ALR, DISABLE);
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+ //need to disable radio also in case that a radio interrupt is happening when set Alarm value
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+
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+
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+ //Reset RTC Counter to begin a new slot
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+ RTC_SetAlarm(period);
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+ RTC_WaitForLastTask();
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+
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+ radiotimer_vars.currentSlotPeriod = period;
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+
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+ //set radiotimer irpstatus
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+ radiotimer_vars.overflowORcompare = RADIOTIMER_OVERFLOW;
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+ RTC_ClearFlag(RTC_IT_ALR);
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+ RTC_ITConfig(RTC_IT_ALR, ENABLE);
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+ }
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+
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+ extern uint32_t RTC_GetAlarm(void);
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+ uint16_t radiotimer_getPeriod() {
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+ RTC_WaitForSynchro();
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+ uint32_t period = RTC_GetAlarm();
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+ return (uint16_t)period;
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+ }
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+
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+ //===== compare
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+
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+ void radiotimer_schedule(uint16_t offset) {
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+ RTC_ITConfig(RTC_IT_ALR, DISABLE);
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+ //need to disable radio also in case that a radio interrupt is happening
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+
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+ // Set the RTC alarm(RTC timer will alarm at next state of slot)
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+ RTC_SetAlarm(offset);
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+ RTC_WaitForLastTask();
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+
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+ //set radiotimer irpstatus
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+ radiotimer_vars.overflowORcompare = RADIOTIMER_COMPARE;
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+ RTC_ClearFlag(RTC_IT_ALR);
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+ RTC_ITConfig(RTC_IT_ALR, ENABLE);
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+ }
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+
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+ void radiotimer_cancel() {
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+ RTC_ITConfig(RTC_IT_ALR, DISABLE);
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+ //need to disable radio also in case that a radio interrupt is happening
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+
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+
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+ // set RTC alarm (slotlength)
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+ RTC_SetAlarm(radiotimer_vars.currentSlotPeriod);
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+ RTC_WaitForLastTask();
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+
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+ //set radiotimer irpstatus
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+ radiotimer_vars.overflowORcompare = RADIOTIMER_OVERFLOW;
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+ RTC_ClearFlag(RTC_IT_ALR);
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+ RTC_ITConfig(RTC_IT_ALR, ENABLE);
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+ }
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+
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+ //===== capture
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+
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+ inline uint16_t radiotimer_getCapturedTime() {
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+ RTC_WaitForSynchro();
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+ uint32_t counter = RTC_GetCounter();
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+ return (uint16_t)counter;
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+ }
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+
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+ //=========================== private =========================================
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+
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+ //=========================== interrupt handlers ==============================
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+
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+ kick_scheduler_t radiotimer_isr() {
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+ uint8_t taiv_temp = radiotimer_vars.overflowORcompare;
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+ switch (taiv_temp) {
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+ case RADIOTIMER_COMPARE:
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+ DEBUG("%s cmp\n", __PRETTY_FUNCTION__);
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+ if (radiotimer_vars.compare_cb!=NULL) {
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+ RCC_Wakeup();
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+ // call the callback
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+ radiotimer_vars.compare_cb();
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+ // kick the OS
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+ return KICK_SCHEDULER;
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+ }
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+ break;
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+ case RADIOTIMER_OVERFLOW: // timer overflows
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+ DEBUG("%s of\n", __PRETTY_FUNCTION__);
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+ if (radiotimer_vars.overflow_cb!=NULL) {
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+
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+ //Wait until last write operation on RTC registers has finished
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+ RTC_WaitForLastTask();
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+
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+ //Set the RTC time counter to 0
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+ RTC_SetCounter(0xffffffff);
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+ RTC_WaitForLastTask();
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+ RCC_Wakeup();
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+ // call the callback
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+ radiotimer_vars.overflow_cb();
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+ DEBUG("returned...\n");
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+ // kick the OS
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+ return KICK_SCHEDULER;
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+ }
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+ break;
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+ case RADIOTIMER_NONE: // this should not happen
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+ DEBUG("%s none\n", __PRETTY_FUNCTION__);
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+ default:
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+ while(1); // this should not happen
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+ }
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+ return DO_NOT_KICK_SCHEDULER;
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+ }
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