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/*
* mur.sat
*
* Somewhen in the year 2012, mur.at will have a nano satellite launched
* into a low earth orbit (310 km above the surface of our planet). The
* satellite itself is a TubeSat personal satellite kit, developed and
* launched by interorbital systems. mur.sat is a joint venture of mur.at,
* ESC im Labor and realraum.
*
* Please visit the project hompage at sat.mur.at for further information.
*
*
* Copyright (C) 2012 Christian Pointner <equinox@mur.at>
* Markus Grüneis <gimpf@gimpf.org>
*
* This file is part of mur.sat.
*
* mur.sat is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version.
*
* mur.sat is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with mur.sat. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <termios.h>
#define BUFFER_START 0x2000u
//#define BUFFER_SIZE 960u
#define BUFFER_SIZE 10u
#define BUFFER_END (BUFFER_START + BUFFER_SIZE)
#define RAM_SIZE (BUFFER_END + 1)
#define BOOL int
#define FALSE 0
#define TRUE 1
char picRam[RAM_SIZE] = { 0 };
char* bufferStart = &(picRam[BUFFER_START]);
char* bufferEnd = &(picRam[BUFFER_END - 1]);
char spiData = -1;
char *writePtr, *readPtr;
BOOL overrun, underrun, cmd_read;
/* ##### Code under Test ##### */
void buf_init()
{
writePtr = bufferStart;
readPtr = bufferStart;
overrun = FALSE;
underrun = TRUE;
cmd_read = FALSE;
}
void wbuf_next()
{
if (!overrun) {
writePtr++;
writePtr = writePtr > bufferEnd ? bufferStart : writePtr;
underrun = FALSE;
if(writePtr == readPtr) {
overrun = TRUE;
}
}
}
void rbuf_next()
{
if(!underrun) {
readPtr++;
readPtr = readPtr > bufferEnd ? bufferStart : readPtr;
overrun = FALSE;
if(readPtr == writePtr) {
underrun = TRUE;
}
}
}
void adcInterrupt()
{
static char value = 0;
if (!overrun) {
*writePtr = ++value;
wbuf_next();
}
}
void sspInterrupt()
{
if (cmd_read && spiData == 0) {
*readPtr = 0;
rbuf_next();
spiData = underrun ? -1 : *readPtr;
} else if (spiData == 'r') {
cmd_read = TRUE;
spiData = underrun ? -1 : *readPtr;
} else {
cmd_read = FALSE;
printf("%s\n", "I don't like you!");
}
}
/* ##### test environment ##### */
void debugPrint(char cmd) {
printf("cmd('%c'): wPtr=%d, rPtr=%d, ovr=%d, udr=%d, sspbuf=%02hhx\n",
cmd,
(int) (writePtr - bufferStart),
(int) (readPtr - bufferStart),
(int) overrun,
(int) underrun,
(int) spiData);
int i;
printf(" ");
for(i = 0; i < BUFFER_SIZE; ++i) {
printf("%02hhx ", (unsigned int)bufferStart[i]);
}
printf("\n");
}
int main()
{
struct termios t;
tcgetattr(STDIN_FILENO, &t);
t.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &t);
buf_init();
int key;
debugPrint(' ');
for(;;) {
key = getchar();
switch(key) {
case EOF:
case 4:
case 'q': return 0;
case '\r':
case '\n': break;
case '+': adcInterrupt(); debugPrint(key); break;
case '0': spiData = 0; sspInterrupt(); debugPrint(key); break;
default: spiData = key; sspInterrupt(); debugPrint(key); break;
}
}
return 0;
}
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