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90 lines
1.6 KiB
C
90 lines
1.6 KiB
C
/*
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* fw/sample.c - Acceleration sensor sample protocol
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stddef.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <avr/interrupt.h>
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#include "rf.h"
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#include "sweep.h"
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#include "accel.h"
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#include "proto.h"
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#include "dispatch.h"
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#include "io.h"
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/* @@@ keep it small for now - we're running out of RAM :-( */
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//#define MAX_PACKET 120 /* <- MAX_PSDU -3 (hdr) -2 (CRC) */
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#define MAX_PACKET 50 /* <- MAX_PSDU -3 (hdr) -2 (CRC) */
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static uint8_t buf[MAX_PACKET+3] = { SAMPLES, 0, 0 };
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static uint16_t *p;
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static bool expect_x;
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static void handler(bool x, uint16_t v)
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{
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uint32_t t;
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if (x != expect_x)
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return;
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t = uptime_irq();
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if (p == (uint16_t *) (buf+3))
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*p++ = t >> 16;
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*p++ = t;
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*p++ = v;
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expect_x = !expect_x;
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if (x)
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return;
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if ((uint8_t *) (p+4) <= buf+MAX_PACKET)
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return;
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rf_send(buf, (uint8_t *) p-buf);
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buf[1]++;
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p = (uint16_t *) (buf+3);
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}
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static bool sample_first(uint8_t limit, const uint8_t *payload)
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{
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if (payload[0]) {
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buf[1] = 0;
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cli();
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sample = handler;
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p = (uint16_t *) (buf+3);
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expect_x = 1;
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sei();
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} else {
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cli();
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sample = NULL;
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sei();
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}
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return 1;
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}
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static bool sample_more(uint8_t seq, uint8_t limit, const uint8_t *payload)
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{
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return 0;
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}
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struct handler sample_handler = {
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.type = SAMPLE,
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.first = sample_first,
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.more = sample_more,
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};
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