DigitalInfinity/ESP32-PaxCounter
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IF482 precision improvement (experimental)

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This commit is contained in:
Klaus K Wilting 2019-02-12 23:59:08 +01:00
parent 1393e47052
commit 135d635e8c
1 changed files with 11 additions and 13 deletions
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24
src/if482.cpp
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@ -127,7 +127,7 @@ int if482_init(void) {
String IF482_Out(time_t tt) {
time_t t = 1 + myTZ.toLocal(tt);
time_t t = myTZ.toLocal(tt);
char mon, buf[14], out[IF482_FRAME_SIZE];
switch (timeStatus()) { // indicates if time has been set and recently synced
@ -159,17 +159,18 @@ void if482_loop(void *pvParameters) {
configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
time_t tOut;
TickType_t wakeTime;
const TickType_t tTx = tx_time(HAS_IF482); // duration of telegram transmit
BitsPending = true; // start blink in display
// phase 1: sync task on top of second
sync_clock(now());
const TickType_t t0 = xTaskGetTickCount(); // moment of start top of second
sync_clock(now()); // delay until top of second
// const TickType_t t0 = xTaskGetTickCount(); // moment of start top of second
timepulse_start(); // start timepulse
xTaskNotifyWait(
@ -182,7 +183,7 @@ void if482_loop(void *pvParameters) {
const TickType_t tShot =
(tOffset < tTx) ? (1000 - tOffset - tTx) : (tOffset - tTx);
ESP_LOGI(TAG, "IF482 signal synced with precision %dms", 1000 - tOffset);
ESP_LOGI(TAG, "IF482 signal synced with clock, tShot=%dms", tShot);
// phase 2: sync task on time pulse interrupt
for (;;) {
@ -192,18 +193,16 @@ void if482_loop(void *pvParameters) {
&wakeTime, // receives moment of call from isr
portMAX_DELAY); // wait forever (missing error handling here...)
tOut = now() + 1; // next second after waketime
// select clock scale
#if (PPS == IF482_PULSE_DURATION) // we don't need clock rescaling
// wait until it's time to start transmit telegram for next second
vTaskDelayUntil(&wakeTime, tShot); // sets waketime to moment of tShot
IF482.print(IF482_Out(tOut));
IF482.print(IF482_Out(now() + 1));
#elif (PPS > IF482_PULSE_DURATION) // we need upclocking
for (uint8_t i = 1; i <= PPS / IF482_PULSE_DURATION; i++) {
vTaskDelayUntil(&wakeTime, tShot); // sets waketime to moment of shot
IF482.print(IF482_Out(tOut));
IF482.print(IF482_Out(now() + 1));
}
#elif (PPS < IF482_PULSE_DURATION) // we need downclocking, not yet implemented
@ -213,15 +212,14 @@ void if482_loop(void *pvParameters) {
} // if482_loop()
// helper function to calculate IF482 telegram serial tx time from serial
// settings
// calculate serial tx time from IF482 serial settings
TickType_t tx_time(unsigned long baud, uint32_t config, int8_t rxPin,
int8_t txPins) {
uint32_t datenbits = ((config & 0x0c) >> 2) + 5;
uint32_t startbits = ((config & 0x20) >> 5) + 1;
uint32_t stopbits = ((config & 0x20) >> 5) + 1;
return pdMS_TO_TICKS(
round(((datenbits + startbits + 1) * IF482_FRAME_SIZE * 1000.0 / baud)));
round(((1 + datenbits + stopbits) * IF482_FRAME_SIZE * 1000.0 / baud)));
}
#endif // HAS_IF482