timer.cpp
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/*
* Copyright (c) 2015-2016, Arkadiusz Materek (arekmat@poczta.fm)
*
* Licensed under GNU General Public License 3.0 or later.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "timer.hpp"
#include <xmc_prng.h>
namespace dali {
namespace xmc {
namespace {
const uint16_t* kUniqeChipId = (uint16_t*) 0x10000FF0; // 8 elements
#define MAX_TASKS (3)
#define TICKS_PER_SECOND 1000
typedef struct {
dali::ITimer::ITimerTask* task;
uint64_t time;
uint32_t period;
} TaskInfo;
TaskInfo gTasks[MAX_TASKS];
volatile uint64_t gSystemTimeMs;
}
//static
Timer* Timer::getInstance() {
static Timer gDaliTimer;
return &gDaliTimer;
}
Timer::Timer() {
XMC_PRNG_INIT_t prngConfig;
prngConfig.key_words[0] = kUniqeChipId[3];
prngConfig.key_words[1] = kUniqeChipId[4];
prngConfig.key_words[2] = kUniqeChipId[5];
prngConfig.key_words[3] = kUniqeChipId[6];
prngConfig.key_words[4] = kUniqeChipId[7];
prngConfig.block_size = XMC_PRNG_RDBS_WORD;
XMC_PRNG_Init(&prngConfig);
SysTick_Config(SystemCoreClock / TICKS_PER_SECOND);
}
Timer::~Timer() {
WR_REG(SysTick->CTRL, SysTick_CTRL_ENABLE_Msk, SysTick_CTRL_ENABLE_Pos, 0);
XMC_PRNG_DeInit();
}
dali::Status Timer::schedule(ITimerTask* task, uint32_t delay, uint32_t period) {
for (uint8_t i = 0; i < MAX_TASKS; ++i) {
TaskInfo* taskInfo = &gTasks[i];
if (taskInfo->task == nullptr) {
taskInfo->task = task;
taskInfo->time = gSystemTimeMs + delay;
taskInfo->period = period;
return dali::Status::OK;
}
}
return dali::Status::ERROR;
}
void Timer::cancel(ITimerTask* task) {
for (uint8_t i = 0; i < MAX_TASKS; ++i) {
TaskInfo* taskInfo = &gTasks[i];
if (taskInfo->task == task) {
taskInfo->task = nullptr;
}
}
}
uint32_t Timer::randomize() {
return ((uint32_t) XMC_PRNG_GetPseudoRandomNumber() << 8) + (uint32_t) gSystemTimeMs;
}
// static
uint64_t Timer::getTimeMs() {
return gSystemTimeMs;
}
// static
void Timer::runSlice() {
for (uint8_t i = 0; i < MAX_TASKS; ++i) {
TaskInfo* taskInfo = &gTasks[i];
if (taskInfo->task != nullptr) {
if (taskInfo->time <= gSystemTimeMs) {
taskInfo->task->timerTaskRun();
if (taskInfo->period != 0) {
taskInfo->time += taskInfo->period;
} else {
taskInfo->task = nullptr;
}
}
}
}
}
extern "C" {
void SysTick_Handler(void) {
gSystemTimeMs += 1000 / TICKS_PER_SECOND;
}
} // extern "C"
} // namespace xmc
} // namespace dali