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tornado/fw/tornado.c: add test mode indicating positive zero-crossing

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Works sometimes but often produces false zero-crossings, particularly
if there are many chain "jumps".
This commit is contained in:
Werner Almesberger 2012-12-03 21:55:21 -03:00
parent bc00a4d979
commit 6ccdd5255a
1 changed files with 48 additions and 4 deletions
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52
tornado/fw/tornado.c
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@ -1,11 +1,13 @@
#include <stdbool.h>
#include <stdint.h>
#include <avr/interrupt.h>
#define F_CPU 8000000UL
#include <util/delay.h>
#include "io.h"
#include "led.h"
#include "accel.h"
#define HIGH(port) \
@ -92,12 +94,44 @@ static uint16_t adc(bool x)
}
#define E_SHIFT 3 /* ~ 0.1 */
#define M_SHIFT 11 /* ~ 1/sample_rate */
#define HYSTERESIS 14
static void zxing(uint16_t x, uint16_t y)
{
static uint8_t one[LED_BYTES] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static uint16_t e = 512 << E_SHIFT;
static uint32_t m = 512 << M_SHIFT;
int16_t d;
static bool up = 0;
static bool on = 0;
e = y+(e-(e >> E_SHIFT));
m = y+(m-(m >> M_SHIFT));
d = (e >> E_SHIFT)-(m >> M_SHIFT);
if (on) {
on = 0;
led_off();
}
if (up) {
if (d < -HYSTERESIS)
up = 0;
} else {
if (d > HYSTERESIS) {
up = 1;
led_show(one);
on = 1;
}
}
}
int main(void)
{
static uint8_t p[LED_BYTES];
uint8_t mode = 0;
uint16_t n = 0, v;
PORTB = HIGH(B);
PORTC = HIGH(C);
PORTD = HIGH(D);
@ -118,6 +152,15 @@ int main(void)
#endif
led_init();
#if 1
sample = zxing;
accel_start();
sei();
while (1);
#else
static uint8_t p[LED_BYTES];
uint8_t mode = 0;
uint16_t n = 0, v;
while (1) {
while (!PIN(SW_SW));
@ -153,4 +196,5 @@ int main(void)
}
_delay_ms(100);
}
#endif
}