113 lines
2.1 KiB
C
113 lines
2.1 KiB
C
#include <wiringPi.h>
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#include <wiringPiSPI.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <libconfig.h>
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#include "LS7366R.h"
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#include "influx.h"
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#include "ringbuffer.h"
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#include "led.h"
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const int CTRL_OUT = 16;
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const int INTR_IN = 19;
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const int SPI_CHAN = 0;
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const int SPI_SPEED = 1000000;
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config_t cfg;
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const char EPSILON_KEY[] = "epsilon";
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const double DEFAULT_EPSILON = 0.01;
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uint32_t skipped = 0;
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void isr() {
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static uint32_t lastCounter = 0;
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uint32_t currentCounter = ls7366rReadOTR();
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uint32_t diff = currentCounter - lastCounter;
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lastCounter = currentCounter;
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ringbufferPut(diff);
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led(E_GREEN, true);
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}
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void init() {
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wiringPiSetupGpio();
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wiringPiSPISetup(SPI_CHAN, SPI_SPEED);
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pinMode(CTRL_OUT, OUTPUT);
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digitalWrite(CTRL_OUT, 0);
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pinMode(INTR_IN, INPUT);
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}
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void readConfig() {
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config_init(&cfg);
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if (! config_read_file(&cfg, "/opt/etc/counter.cfg")) {
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fprintf(stderr, "failed to read config file: %s:%d - %s\n",
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config_error_file(&cfg), config_error_line(&cfg),
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config_error_text(&cfg));
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config_destroy(&cfg);
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exit(-1);
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}
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}
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void start() {
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wiringPiISR(INTR_IN, INT_EDGE_RISING, isr);
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}
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int main (void) {
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readConfig();
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init();
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ledInit();
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ls7366rInit(SPI_CHAN);
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influxInit(&cfg);
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start();
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double epsilon;
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if (! config_lookup_float(&cfg, EPSILON_KEY, &epsilon)) {
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epsilon = DEFAULT_EPSILON;
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}
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double lastF = 0;
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bool settled = false;
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uint8_t ledTick = 0;
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while (1) {
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uint32_t diff = ringbufferGet();
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double f = 1.0 / (((double) diff) / 1000000.0);
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if (settled && (abs(f - lastF) > epsilon)) {
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fprintf(stderr, "Current f=%f, last f=%f, gradient too large, skipped\n", f, lastF);
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skipped++;
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f = lastF;
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}
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lastF = f;
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// printf("%f\n", f);
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influxAddFrequency(f);
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ledTick++;
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if (ledTick == 50) {
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ledTick = 0;
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led(E_GREEN, false);
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if (! settled) {
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fprintf(stderr, "Now it is settled\n");
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settled = true;
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}
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}
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}
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// will never be reached
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config_destroy(&cfg);
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}
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