void DAS(void){
unsigned long input;
unsigned static long LastTime; // time at previous ADC sample
unsigned long thisTime; // time at current ADC sample
long jitter; // time between measured and expected, in us
if(NumSamples < RUNLENGTH){ // finite time run
PE0 ^= 0x01;
input = ADC_In(); // channel set when calling ADC_Init
PE0 ^= 0x01;
thisTime = OS_Time(); // current time, 12.5 ns
DASoutput = Filter(input);
FilterWork++; // calculation finished
if(FilterWork>1){ // ignore timing of first interrupt
unsigned long diff = OS_TimeDifference(LastTime,thisTime);
if(diff>PERIOD){
jitter = (diff-PERIOD+4)/8; // in 0.1 usec
}else{
jitter = (PERIOD-diff+4)/8; // in 0.1 usec
}
if(jitter > MaxJitter){
MaxJitter = jitter; // in usec
} // jitter should be 0
if(jitter >= JitterSize){
jitter = JITTERSIZE-1;
}
JitterHistogram[jitter]++;
}
LastTime = thisTime;
PE0 ^= 0x01;
}
}
void DAS(void){
int index;
unsigned short input;
unsigned static long LastTime; // time at previous ADC sample
unsigned long thisTime; // time at current ADC sample
long jitter; // time between measured and expected
if(NumSamples < RUNLENGTH){ // finite time run
input = ADC_In(1);
thisTime = OS_Time(); // current time, 20 ns
DASoutput = Filter(input);
FilterWork++; // calculation finished
if(FilterWork>1){ // ignore timing of first interrupt
jitter = OS_TimeDifference(LastTime,thisTime) - 100000/50; // in usec
if(jitter > MaxJitter){
MaxJitter = jitter;
}
if(jitter < MinJitter){
MinJitter = jitter;
} // jitter should be 0
index = jitter+JITTERSIZE/2; // us units
if(index<0)index = 0;
if(index>=JitterSize) index = JITTERSIZE-1;
JitterHistogram[index]++;
}
LastTime = thisTime;
}
}
// ******** Jitter2 ***************
// records the jitter for the second periodic background thread
void Jitter2(void) {
int index;
unsigned static long LastTime;
static char First = TRUE;
unsigned long thisTime;
long jitter;
thisTime = OS_Time();
if(First == FALSE) {
jitter = (OS_TimeDifference(thisTime, LastTime) / 10) - (gThread2Period / 50); // in usec
if(jitter > MaxJitter2) {
MaxJitter2 = jitter;
}
if(jitter < MinJitter2) {
MinJitter2 = jitter;
}
index = jitter + JITTERSIZE / 2; // us units
if(index < 0)
index = 0;
if(index >= JitterSize)
index = JITTERSIZE - 1;
JitterHistogram2[index]++;
} else {
First = FALSE;
}
LastTime = thisTime;
}
int main(void)
{
unsigned int id;
unsigned long time;
id = OS_Id();
PF2 ^= 0x04;
Display_Message(0,line++, "Hello world: ", id);
OS_AddThread(thread, 128, 1);
time = OS_Time();
OS_Sleep(1000);
time = (((OS_TimeDifference(time, OS_Time()))/1000ul)*125ul)/10000ul;
Display_Message(0,line++, "Sleep time: ", time);
PF2 ^= 0x04;
OS_Kill();
}
void JitterFinish(long thisTime){
if(LastTime!=0){
jitter = OS_TimeDifference(thisTime,LastTime)/50-PERIOD/50; // in usec
if(jitter > MaxJitter){
MaxJitter = jitter;
}
if(jitter < MinJitter){
MinJitter = jitter;
} // jitter should be 0
jindex = jitter+JITTERSIZE/2; // us units
if(jindex<0)jindex = 0;
if(jindex>=JitterSize) jindex = JITTERSIZE-1;
JitterHistogram[jindex]++;
}
LastTime = thisTime;
}
// ******* OS_UpdateTimeInfoOnDisable **********
// Used in OS_DisableInterrupts and OS_StartCritical
// Used to keep track of how much time is spent when interrupts are enabled.
void OS_UpdateTimeInfoOnDisable(void) {
if (continueMeasuring && OS_IsRunning) {
unsigned long thisTime = OS_Time();
if (interruptsEnabled) { // interrupts were enabled. Calculate time spent in disabled mode
if (lastEnableTime != 0) {
if (thisTime >= lastEnableTime) {
unsigned long diff = OS_TimeDifference(thisTime, lastEnableTime);
if (enableTime > UINT32_T_MAX*80000 - diff) {
continueMeasuring = 0;
} // overflowed
enableTime += diff;
} // else there was an overflow in the timer
} // else this was the first time disabling interrupts. Don't calculate anything
//lastDisableTime = thisTime;
}
lastDisableTime = thisTime;
}
interruptsEnabled = 0;
}
static void pingHandler(ping_config_t* ping) {
int peripheral = ping->peripheral;
int portBase = ping->portBase;
int pin = ping->pin;
int pulseStarted = ping->pulseStarted;
UINT reload = OS_RawTimerReload();
GPIOPinIntClear(portBase, pin);
// this is the rising edge
if(!pulseStarted && GPIOPinRead(portBase, pin)) {
ping->pulseStartTime = reload - OS_RawTimerTime();
ping->pulseStarted = TRUE;
}
else if(pulseStarted) {
ping->pulseStarted = FALSE;
ping->pulseEndTime = reload - OS_RawTimerTime();
GPIOPinIntDisable(portBase, pin);
ping->sampleHandler(OS_TimeDifference(ping->pulseEndTime, ping->pulseStartTime, reload));
}
}
// ******* OS_UpdateTimeInfoOnEnable **********
// Used in OS_EnableInterrupts and OS_EndCritical
// Used to keep track of how much time is spent when interrupts are disabled.
void OS_UpdateTimeInfoOnEnable(void) {
if (continueMeasuring && OS_IsRunning) {
unsigned long thisTime = OS_Time();
// this is called when interrupts are going to be enabled
// keep track of disabled time
if (!interruptsEnabled) { // interrupts were disabled, calculate time spent in disabled mode
if (lastDisableTime != 0) {
if (thisTime >= lastDisableTime) {
unsigned long diff = OS_TimeDifference(thisTime, lastDisableTime);
if (disableTime > UINT32_T_MAX*80000 - diff) {
continueMeasuring = 0;
}
disableTime += diff;
if (diff > maxDisableTime) {
maxDisableTime = diff;
}
} // else there was an overflow in the timer
} // else this is the first time enabling interrupts. Don't calculate anything
//lastEnableTime = thisTime;
} // else do nothing
lastEnableTime = thisTime;
}
interruptsEnabled = 1;
}
//*******PseudoWork*************
// simple time delay, simulates user program doing real work
// Input: amount of work in 100ns units (free free to change units
// Output: none
void PseudoWork(unsigned short work){
unsigned short startTime;
startTime = OS_Time(); // time in 100ns units
while(OS_TimeDifference(startTime,OS_Time()) <= work){}
}
